Academic literature on the topic 'Molding materials Thermal properties'

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Journal articles on the topic "Molding materials Thermal properties"

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Hentati, Nesrine, Mohamed Kchaou, Anne-Lise Cristol, Riadh Elleuch, and Yannick Desplanques. "Impact of hot molding temperature and duration on braking behavior of friction material." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 234, no. 9 (September 9, 2019): 1416–24. http://dx.doi.org/10.1177/1350650119873789.

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The manufacturing process of brake materials used for braking applications consists of a succession of steps among which the hot molding has a major impact on properties and performance of materials. In this paper, impact of hot molding temperature and duration on mechanical and thermal properties of friction materials developed with simplified formulation was investigated. Two different hot molding conditions were studied: condition 1 (low temperature associated to long duration) and condition 2 (high temperature associated to short duration). Braking behavior, thermo-mechanical phenomena and wear and friction mechanisms were also investigated. Results indicated that hot molding conditions did not significantly affect mechanical properties and tribological behavior, but they had impact on thermal properties (material molded according to condition 1, material A presented a higher thermal conductivity) and on wear mechanisms involved in the contact. In addition, results revealed that the studied hot molding conditions impacted thermal localization recorded during braking that was denser for the disc rubbed against material B (material molded according to condition 2).
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Dobránsky, Jozef, and Zigmund Doboš. "Effect of thermal degradation on rheological properties of polymeric materials." MATEC Web of Conferences 299 (2019): 06001. http://dx.doi.org/10.1051/matecconf/201929906001.

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The aim of this paper is to monitor the melt volume index of thermoplastic materials and other rheological properties such as shear rate and viscosity. The aim is to compare and assess whether several times ground and subsequently re-melted samples of pure polymer granulate will have the same or similar rheology properties and whether adjustment of the injection molding machine will be required or willneed to reduce or increase production times. Thermo Scientific with HAAKE Meltflow MT software was used to determine the melt flow rate index (MVR) of thermoplastic materials. Based on the melt flow rate (MVR), shear rate and viscosity evaluation, it has been found that, although the selected materials have undergone multiple changes in the rheology of the polymeric materials, there is no problem in the molding process, and MVR does not change significantly. In this case, no changes in the settings of theinjection molding machines and reduction or increase in production times will be necessary. When re-melting the granulate samples, no excess waste was generated, which would then need to be disposed of and the samples could be re-used for further measurement after grinding.
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Srebrenkoska, Vineta, Gordana Bogoeva-Gaceva, and Dimko Dimeski. "Composite material based on an ablative phenolic resin and carbon fibers." Journal of the Serbian Chemical Society 74, no. 4 (2009): 441–53. http://dx.doi.org/10.2298/jsc0904441s.

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In this study, a technological procedure for the production of a molding compound based on short carbon fibers and an ablative phenol-formaldehyde resin for high temperature application was optimized. The starting raw materials were characterized and molding compounds with different fiber/ /matrix ratios and different fiber lengths were obtained. From the different laboratory samples, molded parts were made by thermo-compression. The basic mechanical and thermal properties of the composites were determined. From the obtained results, the optimal fiber/matrix ratio was determined for a production of molding compound for high temperature application. The molding process of the composite material was optimized and all the parameters for good mechanical properties and high thermal stability of the composite were obtained. Optimization of the composite molding process was performed by the application of a numerical method for a planned experiment, i.e., a full three-factorial experimental design with variance of all three parameters (fiber length, temperature and time of the press cycle) on two levels. The obtained mechanical properties (flexural strength: 247 MPa, modulus: 27.6 GPa, impact resistance: 110 (for test moldings 10 mm?10 mm) and 91 kJ/m2 (for test moldings 15 mm?15 mm)) justified the application of this composite material in the automotive, leisure, military and other industries where high temperature resistance and high mechanical strength is required.
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Sakurai, Junpei, Mitsuhiro Abe, Masayuki Ando, and Seiichi Hata. "Combinatorial Searching for Ni-Nb-Zr Amorphous Alloys as Glass Lens Molding Die Materials." Key Engineering Materials 447-448 (September 2010): 661–65. http://dx.doi.org/10.4028/www.scientific.net/kem.447-448.661.

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This paper presents a search for Ni-Nb-Zr amorphous alloys for application as glass lens molding die materials. To efficiently screen candidate materials, we employed the combinatorial method partially to evaluate thermal stability. First, compositionally spread Ni-Nb-Zr libraries were fabricated by combinatorial arc plasma deposition (CAPD). In order to evaluate the high thermal stability, Ni-Nb-Zr amorphous samples in the libraries were annealed at 723K, the molding temperature for glass lens, for various times in vacuum. Phases in the annealed samples were identified by X-ray diffraction. From XRD identification, candidate amorphous samples with high thermal stabilities were screened. Sputtered samples with the same compositions as the candidate amorphous samples were then fabricated. Other desired properties for glass lens molding die materials, such as mechanical strength, machinability and anti-sticking properties, were evaluated. These investigations revealed Ni36Nb39Zr25 to be a suitable material for a new glass lens molding die. This material exhibited a high fracture stress f of 1.3 GPa, good heat resistance, good machinability, and excellent anti-sticking properties to molten glass.
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Xi, Yong Guang, Tong Jiang Peng, Hai Feng Liu, and Ji Ming Chen. "Preparation and Properties of Expanded Vermiculite/Gypsum Thermal Insulation Boards." Advanced Materials Research 178 (December 2010): 220–25. http://dx.doi.org/10.4028/www.scientific.net/amr.178.220.

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In this paper, thermal insulation boards comprising expanded vermiculite and gypsum were manufactured by casting and compression molding methods respectively. The effects of flake size and preparation methods of expanded vermiculite (EV), ratio of calcined gypsum/EV and molding methods on thermal and mechanical properties were discussed. The results indicated that the thermal conductivity (λ) and compressive strength of the boards decreased with the increase of flake size, and increased as the ratio of calcined gypsum/EV rose, and the density of the boards increased linearly with the increasing ratio. Compared to compression molding, casting technique can make insulating materials with higher thermal conductivity, compressive strength, and lower water content. The boards containing EV expanded by microwave chemical method presented a better thermal insulating property (λ=0.091W•m-1•K-1) relative to the ones filled with microwave exfoliated EV (λ=0.107W•m-1•K-1). The prepared materials can be used for heat, acoustical insulation and moisture adjustment.
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B Vaggar, Gurushanth, S. C Kamate, and Pramod V Badyankal. "Thermal Properties Characterization of Glass Fiber Hybrid Polymer Composite Materials." International Journal of Engineering & Technology 7, no. 3.34 (September 1, 2018): 455. http://dx.doi.org/10.14419/ijet.v7i3.34.19359.

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In the current work characterization of thermal properties are find out to the prepared specimens of silicon filler hybrid composite materials (silicon filler glass – fiber chop strand). The specimens were prepared by hand layup followed by compression molding machine by non-heating molding technique. Thermal conductivity (K), Coefficient thermal expansion (CTE) and Thermal gravimetric analysis (TGA) are found by composite slab method and by thermal muffler oven in a laboratory. The guard heater is used to supply heat which is measured by voltmeter and ammeter. Thermocouples are placed between the interface of the copper plates and the specimen of silicon filled hybrid polymer composite material (HPC), to read the temperatures. By the experimental readings it is found that the K of silicon filler hybrid composite material directly proportional to the % of silicon fillers for the different trails. The CTE inversely varies with % of silicon fillers and in thermal gravimetric analysis the failure of material takes place at 300°C for a time of 20 minutes and also reduction in mass of silicon inserted hybrid composite material. From the results it has been concluded that the considerable enhance in thermal conductivity with negligible decrease in CTE and increase in thermal resistivity of hybrid composite materials.
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Xue, Mao Quan. "Study and Application of Plastic Construction Materials." Applied Mechanics and Materials 99-100 (September 2011): 1117–20. http://dx.doi.org/10.4028/www.scientific.net/amm.99-100.1117.

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As new building materials, plastic has light weigh, corrosion resistance, low thermal conductivity, thermal insulation, waterproof, energy-saving, molding convenient, high recycling characteristic, widely used in building materials. According to the research of improving its flame retardancy, strength, thermal insulation, waterproof properties, the application of plastic use in doors and windows, pipeline, building walls and roofs of buildings, etc. were reviewed, and the developing direction was discussed.
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Lee, Wen-Jau, I.-Min Tseng, Yu-Pin Kao, Yun-Yun Lee, and Ming-Shan Hu. "Synthesis of alcohol-soluble phenol-formaldehyde resins from pyrolysis oil of Cunninghamia lanceolata wood and properties of molding plates made of resin-impregnated materials." Holzforschung 68, no. 2 (February 1, 2014): 217–22. http://dx.doi.org/10.1515/hf-2013-0068.

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Abstract Fast pyrolysis oil (Py-oil) from Cunninghamia lanceolata wood was the starting material in preparing alcohol-soluble phenol-formaldehyde (PF) resins. For this purpose, phenol (Ph) and Py-oils were mixed in weight ratios of 50/50, 40/60, and 30/70. The molecular weight distribution, thermal setting behavior, and heat resistance of the set resins were investigated. Albizia falcataria wood powder and cotton paper were impregnated with the resin mixture, and molding plates were produced by hot pressing; their physical, mechanical, and thermal properties were evaluated. The results show that Py-oil blended with Ph is a suitable raw material for preparing alcohol-soluble PF resins, which possess the characteristics of thermal melting and setting. The properties of the molding plates were satisfactory. The static bending strength (>100 MPa) and elastic modulus of the cotton paper-based products fulfill the requirements of CNS 10559 standard. The initial temperature of the thermal degradation of molding plates is >345°C. The performance of the molding plates decreased with increasing ratios of Py-oil.
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Billah, Md Maruf, Md Sanaul Rabbi, and Afnan Hasan. "A Review on Developments in Manufacturing Process and Mechanical Properties of Natural Fiber Composites." Journal of Engineering Advancements 2, no. 01 (February 3, 2021): 13–23. http://dx.doi.org/10.38032/jea.2021.01.003.

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From the last few decades, the study of natural fiber composite materials has been gaining strong attention among researchers, scientists, and engineers. Natural fiber composite materials are becoming good alternatives to conventional materials because of their lightweight, high specific strength, low thermal expansion, eco-friendly, low manufacturing cost, nonabrasive and bio-degradable characteristics. It is proven that natural fiber is a great alternative to synthetic fiber in the sector of automobiles, railway, and aerospace. Researchers are developing various types of natural fiber-reinforced composites by combining different types of natural fiber such as jute, sisal, coir, hemp, abaca, bamboo, sugar can, kenaf, banana, etc. with various polymers such as polypropylene, epoxy resin, etc. as matrix material. Based on the application and required mechanical and thermal properties, numerous natural fiber-based composite manufacturing processes are available such as injection molding, compression molding, resin transfer molding, hand lay-up, filament welding, pultrusion, autoclave molding, additive manufacturing, etc. The aim of the paper is to present the developments of various manufacturing processes of natural fiber-based composites and obtained mechanical properties.
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Kim, Young Shin, Jae Kyung Kim, and Euy Sik Jeon. "Effect of the Compounding Conditions of Polyamide 6, Carbon Fiber, and Al2O3 on the Mechanical and Thermal Properties of the Composite Polymer." Materials 12, no. 18 (September 19, 2019): 3047. http://dx.doi.org/10.3390/ma12183047.

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Among the composite manufacturing methods, injection molding has higher time efficiency and improved processability. The production of composites via injection molding requires a pre-process to mix and pelletize the matrix polymer and reinforcement material. Herein, we studied the effect of extrusion process conditions for making pellets on the mechanical and thermal properties provided by injection molding. Polyamide 6 (PA6) was used as the base, and composites were produced by blending carbon fibers and Al2O3 as the filler. To determine the optimum blending ratio, the mechanical properties, thermal conductivity, and melt flow index (MI) were measured at various blending ratios. With this optimum blending ratio, pellets were produced by changing the temperature and RPM conditions, which are major process variables during compounding. Samples were fabricated by applying the same injection conditions, and the mechanical strength, MI values, and thermal properties were measured. The mechanical strength increased slightly as the temperature and RPM increased, and the MI and thermal conductivity also increased. The results of this study can be used as a basis for specifying the conditions of the mixing and compounding process such that the desired mechanical and thermal properties are obtained.
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Dissertations / Theses on the topic "Molding materials Thermal properties"

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Šupa, Jan. "Ověření funkčnosti počítačové simulace v oblasti tepelných vlastností forem." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-230852.

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This diploma thesis deals with thermal qualities of moulding mixtures of foundry mould of various types of sand grains and a computer simulation of the solidification of the cast. The aim of this work is to compare the values of thermal qualities of moulding materials bonded with water glass taken in experimental measurements to the values of thermal qualities of moulding materials connected with organic binding agent contained in simulation software. A sample cast will be moulded in order to evaluate cooling capacities of individual moulding mixtures according the shift of thermal axis. These results will consequently be compared to the results of the simulation.
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Cockcroft, Steven Lee. "Thermal stress analysis of fused-cast Monofrax-S refractories." Thesis, University of British Columbia, 1990. http://hdl.handle.net/2429/30991.

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Mathematical models of heat flow and elastic stress generation based on the finite-element method have been developed and utilized to analyze the Epic-3 Monofrax-S casting process (Monofrax-S is primarily composed of 47-57% A1₂O₃, 34-41% ZrO₂ and 10-15% SiO₂). The results of the mathematical analysis, in conjunction with information obtained from a comprehensive industrial study, has led to the development of mechanisms for the formation of the various crack types found in this casting process. Thermal stresses have been predicted to be generated early in the solidification process in association with rapid cooling of the refractory surface as it contacts the initially cool mould and again later in the solidification process in conjunction with the tetragonal-to-monoclinic phase transformation which occurs in the zirconia component of Monofrax-S. The mathematical analysis has also helped to identify indirectly a potential mechanism for the generation of mechanical stresses. Based on an understanding of the generation of tensile stresses, recommendations have been made for modifications to the moulding and casting procedures in order to reduce the propensity for the formation of cracks. The modifications have included changes to the mould construction and geometry to reduce the generation of mechanical stresses and changes to the moulding materials to impact on the flow of heat at key times during solidification and cooling. With the recommendations in place, the casting process has been re-examined with the mathematical models to verify the impact of the modifications. The predictions show that the modifications have acted to reduce tensile stresses associated with the formation of Type-A and -B cracks. Preliminary industrial trials with the modified mould have yielded blocks free of these defects.
Applied Science, Faculty of
Materials Engineering, Department of
Graduate
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Park, Sang-il. "Thermal conductivity of bentonite-bonded molding sands at high temperatures." Diss., Georgia Institute of Technology, 1987. http://hdl.handle.net/1853/18386.

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Hellman, Olle. "Thermal properties of materials from first principles." Doctoral thesis, Linköpings universitet, Teoretisk Fysik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-78755.

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In the search of clean and efficient energy sources intermediate temperature solid oxide fuel cells are among the prime candidates. What sets the limit of their efficiency is the solid electrolyte. A promising material for the electrolyte is ceria. This thesis aims to improve the characteristics of these electrolytes and help provide thorough physical understanding of the processes involved. This is realised using first principles calculations. The class of methods based on density functional theory generally ignores temperature effects. To accurately describe the intermediate temperature characteristics I have made adjustments to existing frameworks and developed a qualitatively new method. The new technique, the high temperature effective potential method, is a general theory. The validity is proven on a number of model systems. Other subprojects include low-dimensional segregation effects, adjustments to defect concentration formalism and optimisations of ionic conductivity.
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Arrighi, Aloïs. "Thermal and thermoelectric properties of two-dimensional materials." Doctoral thesis, TDX (Tesis Doctorals en Xarxa), 2020. http://hdl.handle.net/10803/670380.

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La gestió tèrmica és un problema crític en el disseny de dispositius nanoelectrònics. Les solucions de refredament avançades i la recol·lecció eficient d'energia són clau per mantenir la tendència de productes electrònics cada vegada més petits i ràpids. Aquesta tesi se centra en la gestió tèrmica i l'ús de calor dissipada en materials emergents per a l'electrònica. En particular, els materials bidimensionals (2DM) i heteroestructures d'aquests són dels candidats més interessants per al futur de l'electrònica i s'estan investigant intensament. En aquesta tesi, s'exploren dos temes principals: (i) el transport tèrmic de 2DMs suspesos, inclòs el grafè CVD, dicalcògens de metalls de transició (TMDC) i heteroestructures de TMDC amb nitrur de bor hexagonal (hBN); i (ii) les propietats tèrmiques i de termoelectricitat de les pel·lícules primes (Bi1-xSbx)2Te3 (BST). Aquests materials s'estan considerant per interconnexions i transistors fins als THz (grafè), per a electrònica digital (TMDCs) i per a aïllament elèctric (hBN) i són ben coneguts com a generadors termoelèctrics, com ho són també materials recentment identificats com a aïllants topològics (BST). En primer lloc, l'objectiu era mesurar la conductivitat tèrmica de 2DMs utilitzant el mètode d'espectroscòpia Raman de dos làsers, recentment desenvolupat. La implementació fou dificultada per l'ús de membranes relativament petites obtingudes dels materials investigats i la seva alta conductivitat tèrmica. Demostràrem que la conductivitat tèrmica del grafè CVD és d'aproximadament 300 W/(m·K). Encara que menor que en el grafè exfoliat, això podria ser degut a les fronteres de gra i al desordre en el grafè CVD. Demostràrem també que les conductivitats tèrmiques de MoS2 i MoSe2 exfoliats (dos TMDC) són de 12 a 24 W/(m·K) i 60 W/(m·K), respectivament. I que per a membranes primes (de poques monocapes) de MoS2, la conductivitat incrementa amb el gruix. Afegint una membrana de hBN exfoliada sobre una mostra de MoS2 prèviament caracteritzada demostràrem un augment notable de la conductivitat tèrmica en l'heteroestructura de hBN/MoS2, quan s'introdueix calor al MoS2. Aquesta presenta una conductivitat tèrmica de 185 W/(m·K), gairebé un ordre de magnitud més gran que el MoS2 sol. En segon lloc, capes primes de BST crescudes mitjançant epitàxia de feix molecular s'estudiaren amb l'objectiu de correlacionar-ne les propietats termoelèctriques amb el seu nivell de Fermi, que sintonitzaria el pes relatiu del transport de volum i dels estats topològics de superfície (TSS). Primer demostràrem que és possible dissenyar l'estructura de la banda i ajustar el nivell de Fermi des de la valència fins a la banda de conducció simplement controlant la concentració de Sb. La demostració s'aconseguí utilitzant espectroscòpia de fotoemissió amb resolució angular en combinació amb conductivitat elèctrica i mesures d'efecte Hall en pel·lícules relativament primes (10 nm). S'identificà la concentració de Sb a la qual els TSSs dominen el transport i es dugueren a terme experiments termoelèctrics en les mateixes capes. No es trobà una correlació clara entre l'energia termoelèctrica i la naturalesa dels portadors de càrrega quan els TSSs eren dominants. Això indica que el transport dels TSSs té una influència limitada en les propietats termoelèctriques d'aquest material, i que per tal d'observar els efectes de superfície es necessitarien capes encara més primes. Finalment, una caracterització de les capes primes de BST usant espectroscòpia Raman demostrà variacions específiques en el comportament associat a la concentració de Sb. En particular, l'augment de la potència del làser va donar lloc a l'aparició de pics Raman no actius d'origen indeterminat. Aquests pics poden indicar la ruptura de simetries estructurals, modes de fonó de superfície o altres efectes com ara ressonàncies plasmòniques que són d'alt interès. La inesperada resposta observada en l'espectre Raman hauria de motivar investigacions addicionals.
La gestión térmica es un problema crítico en el diseño de dispositivos nanoelectrónicos. Las soluciones de enfriamiento avanzadas y la recolección eficiente de energía son clave para mantener la tendencia de productos electrónicos cada vez más pequeños y rápidos. Esta tesis se centra en la gestión térmica y el uso de calor disipado en materiales emergentes para la electrónica. En particular, los materiales bidimensionales (2DM) y las heteroestructuras basadas en ellos son candidatos muy interesantes para el futuro de la electrónica y se están investigando intensamente. La tesis trata dos temas principales: (i) el transporte térmico de 2DMs suspendidos, incluido el grafeno CVD, dicalcogenuros de metales de transición (TMDC) y heteroestructuras de TMDC con nitruro de boro hexagonal (hBN); y (ii) las propiedades térmicas y de termoelectricidad de películas delgadas de (Bi1-xSbx)2Te3(BST). Estos materiales están siendo considerados para interconexiones y transistores hasta THz (grafeno), electrónica digital (TMDCs) y aislamiento eléctrico (hBN) y son bien conocidos como generadores termoeléctricos, como también lo son materiales recientemente identificados como aislantes topológicos (BST). En primer lugar, el objetivo fue medir la conductividad térmica de 2DMs utilizando el método de espectroscopia Raman de dos láser, recientemente desarrollado. El desafío fue el uso de membranas relativamente pequeñas obtenidas y su alta conductividad térmica. Demostramos que la conductividad térmica del grafeno CVD es de aproximadamente 300 W/(m·K). Aunque menor que en el grafeno exfoliado, esto podría deberse a los bordes de grano y al desorden en grafeno CVD. Demostramos también que las conductividades térmicas de MoS2 y MoSe2 exfoliados (dos TMDC) son 12 a 24 W/(m·K) y 60 W/(m·K), respectivamente. Y que para membranas delgadas (pocas monocapas) la conductividad incrementa con su grosor. Agregando una membrana de hBN exfoliada sobre una muestra de MoS2 previamente caracterizada nos permitió demostrar un notable aumento de la conductividad térmica en la heteroestructura de hBN/MoS2, cuando se introduce calor en MoS2. Esta presenta una conductividad térmica de 185 W/(m·K), casi un orden de magnitud mayor que para MoS2. En segundo lugar, se estudiaron películas delgadas de BST crecidas mediante epitaxia de haz molecular con el objetivo de correlacionar sus propiedades termoeléctricas con su nivel de Fermi, que sintonizaría el peso relativo del transporte de volumen y de los estados topológicos de superficie (TSS). Primero demostramos que es posible diseñar la estructura de la banda y ajustar el nivel de Fermi desde la valencia hasta la banda de conducción simplemente controlando la concentración de Sb. Para ello se utilizó espectroscopia de fotoemisión con resolución angular en combinación con conductividad eléctrica y mediciones de Hall en películas relativamente delgadas (10 nm). También se identificó la concentración de Sb a la que los TSSs dominan el transporte y se llevaron a cabo experimentos termoeléctricos en las mismas películas. No se encontró una correlación clara entre la energía termoeléctrica y la naturaleza de los portadores de carga cuando los TSSs eran dominantes, indicando que el transporte de los TSSs tiene una influencia limitada en las propiedades termoeléctricas de este material y que para observar los efectos de superficie se necesitarían películas más delgadas. Finalmente, una caracterización de las películas delgadas de BST usando espectroscopia Raman demostró variaciones específicas en el comportamiento asociado a la concentración de Sb. En particular, el aumento de la potencia del láser dio lugar a la aparición de picos Raman no activos de origen indeterminado. Estos picos pueden indicar la ruptura de simetrías estructurales, modos de fonón de superficie u otros efectos tales como resonancias plasmónicas que son de alto interés, una respuesta que debería motivar investigaciones adicionales.
Thermal management is becoming a critical issue in the packaging and design of nanoelectronics. Advanced cooling solutions and efficient energy harvesting are key aspects to help keep the trend for ever smaller and faster electronics. This thesis is focused on thermal management and the use of heat waste in emerging materials for electronics. In particular, two-dimensional materials (2DM), and related heterostructures, are amongst the most intriguing prospects for future electronics and are being intensively investigated. Here, two main subjects were explored. First, the thermal transport of suspended 2DMs, including CVD graphene, transition metal dichalcogenides (TMDCs) and heterostructures of TMDCs with hexagonal boron nitride (hBN) and, second, the thermal properties and thermoelectricity of (Bi1-xSbx)2Te3 (BST) thin films. These materials are being considered for interconnects and THz transistors (graphene), digital electronics (TMDCs) and electrical insulation (hBN) and are well known as thermoelectric generators, as are also materials that have recently been identified as topological insulators (BST). In the first part, the objective was to demonstrate the measurement of the thermal conductivity of 2DMs using the recently developed two-laser Raman spectroscopy method. Its implementation was rendered difficult by the relatively small exfoliated flakes of the materials investigated and their high thermal conductivity. The thermal conductivity of CVD graphene was found to be about 300 W/(m·K). Although smaller than exfoliated graphene, it is argued that this could be due to grain boundaries and disorder. Exfoliated MoS2 and MoSe2 (two well-known TMDCs) presented thermal conductivities of 12 to 24 W/(m·K) and 60 W/(m·K). Measurements on different membranes of MoS2 further showed that the conductivity increases with the thickness in thin membranes (few monolayers). Furthermore, stacking an exfoliated hBN membrane on top of a previously characterized MoS2 sample allowed us to demonstrate a notorious increase of the thermal conductivity in the hBN/MoS2 heterostructure, when heat is introduced on MoS2. Indeed, when compared with MoS2 alone the thermal conductivity is found to be almost one order of magnitude larger, 185 W/(m·K). For the second part, BST thin films were grown by molecular beam epitaxy. The main objective was to investigate the correlation of the thermoelectric properties of these materials with the Fermi level, which would tune the relative weight of bulk and topological surface state (TSS) transport. It was first demonstrated that controlling the concentration of Sb we could engineer the band structure and tune the Fermi level from the valence to the conduction band. Such demonstration was achieved by using angle-resolved photoemission spectroscopy in combination with conductivity and Hall measurements in relatively thin (10 nm) films. The Sb concentration at which TSS dominated the transport was also identified. Thermoelectric experiments on the same films were then carried out but no clear correlation between the thermopower and the carrier nature was found when the TSSs were dominant. These results indicate that TSS transport has limited influence on the thermoelectric properties. Further studies should be carried our using even thinner films. Finally, a side characterization of the BST thin films using Raman spectroscopy demonstrated specific variations in the behaviour associated to Sb concentration. An increase of the laser power showed the emergence of non-active Raman peaks of undetermined origin. However, they can indicate the presence of broken structural symmetries, surface phonon modes or other effects such as plasmonic resonances. This interesting response is worthy of for further investigation.
Universitat Autònoma de Barelona. Programa de Doctorat en Física
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Modica, S. P. "The thermal properties of homogeneous and composite materials." Thesis, Loughborough University, 1992. https://dspace.lboro.ac.uk/2134/35579.

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A programme of work was instigated to investigate and improve the efficiency, and stability of intra-cavity étalons for the Argon ion laser, especially in the far blue to near ultra-violet wavelength region, by using sol-gel prepared silica. The original program has been modified by experiences outlined below. We have attempted to differentiate between the sol-gel derived and the high temperature prepared silica. We confirm that relatively small changes in thickness of silica monoliths can give rise to proportionally much larger changes of refractive index. Our main target has been to assess whether it is possible to make a new optical material that shows insignificant changes in optical path length or refractive index with temperature.
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Farhoudi, Yalda. "Measurement and computation of thermal stresses in injection molding of amorphous and crystalline polymers." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0018/NQ44426.pdf.

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LeBaut, Yann P. "Thermal aspect of stereolithography molds." Thesis, Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/15991.

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Lind, Cora. "Negative thermal expansion materials related to cubic zirconium tungstate." Diss., Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/30861.

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Liao, Hao-Hsiang. "Thermal and thermoelectric properties of nanostructured materials and interfaces." Diss., Virginia Tech, 2012. http://hdl.handle.net/10919/19198.

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Many modern technologies are enabled by the use of thin films and/or nanostructured composite materials. For example, many thermoelectric devices, solar cells, power electronics, thermal barrier coatings, and hard disk drives contain nanostructured materials where the thermal conductivity of the material is a critical parameter for the device performance. At the nanoscale, the mean free path and wavelength of heat carriers may become comparable to or smaller than the size of a nanostructured material and/or device. For nanostructured materials made from semiconductors and insulators, the additional phonon scattering mechanisms associated with the high density of interfaces and boundaries introduces additional resistances that can significantly change the thermal conductivity of the material as compared to a macroscale counterpart. Thus, better understanding and control of nanoscale heat conduction in solids is important scientifically and for the engineering applications mentioned above. In this dissertation, I discuss my work in two areas dealing with nanoscale thermal transport: (1) I describe my development and advancement of important thermal characterization tools for measurements of thermal and thermoelectric properties of a variety of materials from thin films to nanostructured bulk systems, and (2) I discuss my measurements on several materials systems done with these characterization tools. First, I describe the development, assembly, and modification of a time-domain thermoreflectance (TDTR) system that we use to measure the thermal conductivity and the interface thermal conductance of a variety of samples including nanocrystalline alloys of Ni-Fe and Co-P, bulk metallic glasses, and other thin films. Next, a unique thermoelectric measurement system was designed and assembled for measurements of electrical resistivity and thermopower of thermoelectric materials in the temperature range of 20 to 350 °C. Finally, a commercial Anter Flashline 3000 thermal diffusivity measurement system is used to measure the thermal diffusivitiy and heat capacity of bulk materials at high temperatures. With regards to the specific experiments, I examine the thermal conductivity and interface thermal conductance of two different types of nanocrystalline metallic alloys of nickel-iron and cobalt-phosphorus. I find that the thermal conductivity of the nanocrystalline alloys is reduced by a factor of approximately two from the thermal conductivity measured on metallic alloys with larger grain sizes. With subsequent molecular dynamics simulations performed by a collaborator, and my own electrical conductivity measurements, we determine that this strong reduction in thermal conductivity is the result of increased electron scattering at the grain boundaries, and that the phonon component of the thermal conductivity is largely unchanged by the grain boundaries. We also examine four complex bulk metallic glass (BMG) materials with compositions of Zr₅₀Cu₄₀Al₁₀, Cu46.25Zr44.25Al7.5Er₂, Fe₄₈Cr₁₅Mo₁₄C₁₅B₆Er₂, and Ti41.5Zr2.5Hf₅Cu42.5Ni7.5Si₁. From these measurements, I find that the addition of even a small percentage of heavy atoms (i.e. Hf and Er) into complex disordered BMG structures can create a significant reduction in the phonon thermal conductivity of these materials. This work also indicates that the addition of these heavy atoms does not disrupt electron transport to the degree with which thermal transport is reduced.
Ph. D.
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Books on the topic "Molding materials Thermal properties"

1

Ignaszak, Zenon. Właściwości termofizyczne materiałów formy w aspekcie sterowania procesem krzepnięcia odlewów. Poznań: Politechnika Poznańska, 1989.

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Grimvall, Göran. Thermophysical properties of materials. Amsterdam: Elsevier, 1999.

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Jannot, Yves, and Alain Degiovanni. Thermal Properties Measurement of Materials. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2018. http://dx.doi.org/10.1002/9781119475057.

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Thermophysical properties of materials. Amsterdam: North-Holland, 1986.

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S, Yungman V., ed. Thermal constants of substances. New York: Wiley, 1999.

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Thermal analysis of materials. New York: Marcel Dekker, 1994.

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Thermodynamics of materials. New York: Wiley, 1995.

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Barry, Haworth, and Batchelor Jim, eds. Physics of plastics: Processing, properties and materials engineering. Munich: Hanser, 1992.

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Barry, Haworth, and Batchelor Jim, eds. Physics of plastics: Processing, properties, and materials engineering. Munich: Hanser Publishers, 1992.

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A, Schneider Gerold, Petzow G, North Atlantic Treaty Organization. Scientific Affairs Division., and NATO Advanced Research Workshop on the Thermal Shock and Thermal Fatigue Behavior of Advanced Ceramics (1992 : Munich, Germany), eds. Thermal shock and thermal fatigue behavior of advanced ceramics. Dordrecht: Kluwer Academic Publishers, 1993.

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Book chapters on the topic "Molding materials Thermal properties"

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Dasari, Aravind, Zhong-Zhen Yu, and Yiu-Wing Mai. "Thermal Properties." In Engineering Materials and Processes, 161–84. London: Springer London, 2016. http://dx.doi.org/10.1007/978-1-4471-6809-6_7.

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Buck, Wolfgang, and Steffen Rudtsch. "Thermal Properties." In Springer Handbook of Materials Measurement Methods, 399–429. Berlin, Heidelberg: Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/978-3-540-30300-8_8.

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Domone, Peter, and Marios Soutsos. "Electrical and thermal properties." In Construction Materials, 81–82. Fifth edition. | Boca Raton : CRC Press, [2017]: CRC Press, 2017. http://dx.doi.org/10.1201/9781315164595-8.

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Hummel, Rolf E. "Thermal Conduction." In Electronic Properties of Materials, 285–90. Berlin, Heidelberg: Springer Berlin Heidelberg, 1985. http://dx.doi.org/10.1007/978-3-662-02424-9_21.

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Hummel, Rolf E. "Thermal Expansion." In Electronic Properties of Materials, 291–93. Berlin, Heidelberg: Springer Berlin Heidelberg, 1985. http://dx.doi.org/10.1007/978-3-662-02424-9_22.

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Hummel, Rolf E. "Thermal Conduction." In Electronic Properties of Materials, 351–57. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-017-4914-5_21.

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Hummel, Rolf E. "Thermal Expansion." In Electronic Properties of Materials, 358–60. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-017-4914-5_22.

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Hummel, Rolf E. "Thermal Conduction." In Electronic Properties of Materials, 390–96. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/978-3-642-86538-1_21.

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Hummel, Rolf E. "Thermal Expansion." In Electronic Properties of Materials, 397–99. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/978-3-642-86538-1_22.

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White, Mary Anne. "Thermal Expansion." In Physical Properties of Materials, 173–93. Third edition. | Boca Raton : Taylor & Francis, CRC Press, 2019.: CRC Press, 2018. http://dx.doi.org/10.1201/9780429468261-10.

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Conference papers on the topic "Molding materials Thermal properties"

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Johnson, John L., Lye King Tan, Pavan Suri, and Randall M. German. "Metal Injection Molding of Multi-Functional Materials." In ASME 2003 International Mechanical Engineering Congress and Exposition. ASMEDC, 2003. http://dx.doi.org/10.1115/imece2003-41151.

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Metal injection molding (MIM) enables processing of multi-functional components with combinations of properties including, magnetic and non-magnetic; magnetic response and corrosion resistance; controlled porosity and high thermal conductivity; high inertial weight and high strength; high thermal conductivity and low thermal expansion coefficient; wear resistance and high toughness; high thermal conductivity and good glass-to-metal sealing; high elastic modulus and high damping capacity; and magnetic response and electrical resistance. Such materials can be processed by MIM by co-injection molding and co-sintering, but compositions and sintering cycles must be optimized to minimize stresses arising from shrinkage mismatch while providing the desired properties To determine compatible combinations, individual materials, including various stainless steels and tool steels are mixed with a thermoplastic binder and injection molded. Debound components are subjected to dilatometry to determine dimensional change during sintering. The compatibility of these materials is predicted based on calculations of the thermal stress during co-sintering of concentric rings. For this geometry, shrinkage mismatches result in both radial stresses, which are the highest at the interface and lead to interfacial separation, as well as hoop stresses, which lead to radial cracking. These stresses are dependent on the thicknesses of the inner and outer rings. Defect-free components can be produced when the tensile hoop stresses do not exceed the intrinsic strengths of the component materials. Based on the dilatometry results, low stresses are predicted between a combination of magnetic and non-magnetic stainless steel and between a combination of austenitic stainless steel and tool steel. Example MIM bi-material components are processed from these combinations. The magnetic properties of the tough/wear-resistant bi-material are measured. General predictions and processing guidelines for other multi-functional materials are given.
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Kosnik, Sabrina, and Davide Piovesan. "Polymeric Reaction Molding of Biocompatible Materials: Lessons Learned." In ASME 2020 15th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/msec2020-8465.

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Abstract Polymeric materials are often used as structural binders for biomedical applications. The mechanical properties of the material strongly depend on the fabrication process. To this end, we illustrate a set of casting methods for the production of samples to be tested via destructive methods. The curing process of the artifact was controlled during fabrication, and the molds were also made of polymeric materials. The fabrication of molds is illustrated where particular emphasis is posed on the manufacturing and testing of silicone molds using off-the-shelf material. Cyanoacrylate (CA), Epoxy resin (EP) and Methacrylate ester monomers (MEMs) artifacts have been fabricated using said molds. Of the aforementioned resins, MEMs are a class of thermosetting biocompatible polymers in which fabrication is especially problematic because of the very narrow temperature window at which the monomers polymerize. This research analyzes the casting process of curable materials highlighting the setbacks of using plastic-based molds. Among the cast based manufacturing techniques, specific focus was given to the case where MEMs is made to polymerize in a silicone mold controlling the temperature of the environment. The thermal properties that the silicone-based molds require for the appropriate curing of the polymer are analyzed. It was found that due to the very high heat capacity of silicone, the regulation of the temperature within the mold is difficult often exciding the boiling point of the casted resin.
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Wilden, J., T. Schnick, and A. Wank. "Thermal Spray Moulding – Production of Microcomponents." In ITSC2002, edited by C. C. Berndt and E. Lugscheider. Verlag für Schweißen und verwandte Verfahren DVS-Verlag GmbH, 2002. http://dx.doi.org/10.31399/asm.cp.itsc2002p0144.

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Abstract This work investigates the use of thermal spray molding in the production of microscale components with large aspect ratios. It evaluates a number of spraying processes and coating materials and discusses the impact of the base material on process control and product properties. It also demonstrates the use of simulation for determining optimal process conditions. Paper includes a German-language abstract.
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Ghosh, Kalyanjit, and Srinivas Garimella. "Dynamic Modeling of Thermal Processes in Rotational Molding." In ASME 2004 Heat Transfer/Fluids Engineering Summer Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/ht-fed2004-56801.

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Transient heat transfer phenomena in the rotational molding of plastic parts are modeled in this study. Natural convection and radiation from the furnace and flue gases to the mold housing are analyzed. Other models include transient heat transfer through the mold, single-phase conduction through the particulate plastic material prior to phase change, melting of the plastic, and heating of the liquid pool. Subsequent staged cooling and solidification of the mold and plastic using a combination of free and forced convection and radiation is also modeled. Information about the properties of the plastic in powder, liquid and solid forms is obtained from the literature. Assumptions about the behavior of the plastic powder and the molten plastic during the rotational operations are also made in accordance with the available literature. The mold wall, melt and solidified plastic regions are divided into a number of finite segments to track the temperature variation with time during the molding process. The corresponding variations in masses and thicknesses of the melt and solidified plastic regions are also estimated. Consequently, the energy consumption rates in the process are estimated. The model is applied to a specific molding process in a commercial rotational molding plant. Parametric studies of the effect of heating and cooling durations on the plastic temperatures and the energy consumption rates are also conducted. These analyses provide insights about opportunities for optimization of the heating and cooling schedules to reduce overall energy consumption and also improve throughput.
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Chang, Ruxia, Desong Fan, and Qiang Li. "Research on Thermal Properties of Insulator-Metal Transition at Room Temperature in Sm1-xCaxMnO3." In ASME 2019 6th International Conference on Micro/Nanoscale Heat and Mass Transfer. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/mnhmt2019-3963.

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Abstract The high-purity electron-doped manganites Sm1-xCaxMnO3 nanopowder were prepared by the solid-state reaction method, then the bulk material were obtained through granulation, molding, calcining, grinding and polishing. SCMO nanoparticles with 200 nm were obtained by the sol-gal process. The phase and surface morphology of these materials were characterized by X-ray diffraction and Scanning electron microscope and other experiments. The variable resistivity of the bulk materials were measured by two-wire method in the temperature range of 100–420K. The thermal conductivity was measured by the Laser Flash method. The results show that different doping ratios can change the phase transition temperature of the metal-insulation state. The temperature changed from 0 to 50 °C. The TMI could be regulated to room temperature. When the temperature is high than the TMI, it performs as metal state, on the contrary, it performs as an insulating state.
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Saad, Messiha, Darryl Baker, and Rhys Reaves. "Thermal Characterization of Carbon-Carbon Composites." In ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-64061.

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Thermal properties of materials such as specific heat, thermal diffusivity, and thermal conductivity are very important in the engineering design process and analysis of aerospace vehicles as well as space systems. These properties are also important in power generation, transportation, and energy storage devices including fuel cells and solar cells. Thermal conductivity plays a critical role in the performance of materials in high temperature applications. Thermal conductivity is the property that determines the working temperature levels of the material, and it is an important parameter in problems involving heat transfer and thermal structures. The objective of this research is to develop thermal properties data base for carbon-carbon and graphitized carbon-carbon composite materials. The carbon-carbon composites tested were produced by the Resin Transfer Molding (RTM) process using T300 2-D carbon fabric and Primaset PT-30 cyanate ester. The graphitized carbon-carbon composite was heat treated to 2500°C. The flash method was used to measure the thermal diffusivity of the materials; this method is based on America Society for Testing and Materials, ASTM E1461 standard. In addition, the differential scanning calorimeter was used in accordance with the ASTM E1269 standard to determine the specific heat. The thermal conductivity was determined using the measured values of their thermal diffusivity, specific heat, and the density of the materials.
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Hamasaki, Norikazu, Shuhei Yamaguchi, Shohei Use, Tomohiro Kawashima, Hiroyuki Muto, Masayuki Nagao, Naohiro Hozumi, and Yoshinobu Murakami. "Influence of filler orientation and molding temperature on electrical and thermal properties of PMMA/h-BN composite material produced by electrostatic adsorption method." In 2017 International Symposium on Electrical Insulating Materials (ISEIM). IEEE, 2017. http://dx.doi.org/10.23919/iseim.2017.8166535.

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Falat, T., K. Friedel, K. Malecki, D. Uruska, and W. Gal. "The influence of process parameters and materials properties on stress distribution in MEMS - ASIC integrated systems after molding - numerical and experimental approach." In 2009 10th International Conferene on Thermal, Mechanical and Multi-Physics simulation and Experiments in Microelectronics and Microsystems (EuroSimE). IEEE, 2009. http://dx.doi.org/10.1109/esime.2009.4938440.

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Patrick, Melanie, and Messiha Saad. "3D Examination of the Thermal Properties of Carbon-Carbon Composites." In ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-40146.

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Thermal characterization of composites is essential for their proper assignment to a specific application. Specific heat, thermal diffusivity, and thermal conductivity of carbon-carbon composites are essential in the engineering design process and in the analysis of aerospace vehicles, space systems and other high temperature thermal systems. Specifically, thermal conductivity determines the working temperature levels of a material and is influential in its performance in high temperature applications. There is insufficient thermal property data for carbon-carbon composites over a range of temperatures. The purpose of this research is to develop a thermal properties database for carbon-carbon composites that will contain in-plane (i-p) and through-the-thickness (t-t-t) thermal data at different temperatures as well as display the effects of graphitization on the composite material. The carbon-carbon composites tested were fabricated by the Resin Transfer Molding (RTM) technique, utilizing T300 2-D carbon fabric and Primaset PT-30 cyanate ester resin. Experimental methods were employed to measure the thermal properties. Following the ASTM standard E-1461, the flash method enabled the direct measurement of thermal diffusivity. Additionally, differential scanning calorimetry was performed in accordance with the ASTM E-1269 standard to measure the specific heat. The measured thermal diffusivity, specific heat, and density data were used to compute the thermal conductivity of the carbon-carbon composites. The measured through-the-thickness thermal conductivity values of all the materials tested range from 1.0 to 17 W/m·K, while in-plane values range from 3.8 to 4.6 W/m·K due to the effect of fiber orientation. Additionally, the graphitized samples exhibit a higher thermal conductivity because of the nature of the ordered graphite structure.
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Tillmann, W., E. Vogli, K. Weidenmann, and K. Fleck. "Reinforced Lightweight Composite Materials." In ITSC2005, edited by E. Lugscheider. Verlag für Schweißen und verwandte Verfahren DVS-Verlag GmbH, 2005. http://dx.doi.org/10.31399/asm.cp.itsc2005p1064.

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Abstract Nowadays the use of light weight materials increases rapidly. Owing to growing requirements regarding material properties and corresponding production costs new material designs and novel production concepts are needed. The low density of aluminium and its alloys is accompanied by lower Young’s modules and lower strengths compared to steel. These disadvantages regarding to stiffness and strength can be overcome by using a composite material consisting of aluminium and embedded endless reinforcing elements. In this work a novel technology based on the thermal spraying process to manufacture endless reinforcing elements for extrusion molding of Al-profiles will be discussed. A specific handling system for arc-spraying Al-alloys onto steel wires has been developed. The influence of the coatings materials and coating parameters on the subsequent extrusion moulding process has been studied.
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Reports on the topic "Molding materials Thermal properties"

1

Johra, Hicham. Thermal properties of common building materials. Department of the Built Environment, Aalborg University, January 2019. http://dx.doi.org/10.54337/aau294603722.

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The aim of this technical report is to provide a large collection of the main thermos-physical properties of various common construction materials and materials composing the elements inside the indoor environment of residential and office buildings. The Excel file enclosed with this document can be easily used to find thermal properties of materials for building energy and indoor environment simulation or to analyze experimental data. Note: A more recent version of that report and database are available at: https://vbn.aau.dk/en/publications/thermal-properties-of-building-materials-review-and-database
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Hardy, Robert Douglas, David R. Bronowski, Moo Yul Lee, and John H. Hofer. Mechanical properties of thermal protection system materials. Office of Scientific and Technical Information (OSTI), June 2005. http://dx.doi.org/10.2172/923159.

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Johra, Hicham. Thermal properties of building materials - Review and database. Department of the Built Environment, Aalborg University, October 2021. http://dx.doi.org/10.54337/aau456230861.

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The aim of this technical report is to present and give an overview of a dataset collecting the main thermo-physical properties of various common construction and building materials used in the built environment and composing elements of buildings and infrastructures. In addition, suggestions and recommendations are made for the thermo-physical properties of the materials composing the indoor content and furniture elements present in the built environment.
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Bennett, John G., and Erik S. Polsen. Analysis of the Thermal Shielding Properties of Camouflage Materials. Fort Belvoir, VA: Defense Technical Information Center, February 2007. http://dx.doi.org/10.21236/ada466873.

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Chen, Youping. Prediction of Thermal Transport Properties of Materials with Microstructural Complexity. Office of Scientific and Technical Information (OSTI), October 2017. http://dx.doi.org/10.2172/1398768.

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Lawson, J. Randall, William D. Walton, Nelson P. Bryner, and Francine K. Amon. Estimates of thermal properties for fire fighters' protective clothing materials. Gaithersburg, MD: National Institute of Standards and Technology, 2005. http://dx.doi.org/10.6028/nist.ir.7282.

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J. E. Daw, J. L. Rempe, and D. L. Knudson. Thermal Properties of Structural Materials Found in Light Water Reactor Vessels. Office of Scientific and Technical Information (OSTI), November 2009. http://dx.doi.org/10.2172/974795.

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Roberts, Howard W. Thermal Properties of Contemporary and Conventional Gutta Percha Materials Used in Root Canal Treatment. Fort Belvoir, VA: Defense Technical Information Center, January 2015. http://dx.doi.org/10.21236/ada612962.

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McQuaid, M. J., A. E. Kinkennon, R. A. Pesce-Rodriguez, and R. A. Beyer. Laser-Based Ignition for a Gunfire Simulator (GUFS): Thermal Transport Properties for Candidate Igniter Materials. Fort Belvoir, VA: Defense Technical Information Center, August 1999. http://dx.doi.org/10.21236/ada368648.

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Min, Kyung-Eun. A Study of Thermal Energy Storage of Phase Change Materials: Thermophysical Properties and Numerical Simulations. Portland State University Library, January 2000. http://dx.doi.org/10.15760/etd.6711.

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