Relevant bibliographies by topics / Carbide plate

Academic literature on the topic 'Carbide plate'

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Published: 30 May 2022
Last updated: 31 May 2022

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Journal articles on the topic "Carbide plate"

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Kong, Xiang Hua, Shuai Wang, Yan Hui Sun, Jian Liang Zhang, Xiang Li, Fa Cang Wang, and Jian Lin Geng. "Analysis of Carbide Precipitates in API X80 Medium-Thickness Plate." Advanced Materials Research 146-147 (October 2010): 301–5. http://dx.doi.org/10.4028/www.scientific.net/amr.146-147.301.

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In order to discuss the abnormal fracture in drop weight tear test (DWTT) of API X80 medium-thickness plate, some unqualified samples in DWTT are characterized by SEM, AES, electrolysis and thermal simulation. SEM results show that there are many spherical precipitates in the fracture surface. EDS and AES results show that the abnormal spherical precipitates are carbides including Fe, Ni, Mo, Ti, etc. These precipitates can be extracted by neutral electrolyte method and their EDS results further demonstrate they are carbides. The formationmechanismof the precipitates is discussed based on thermal simulation experiments. When the cooling rate of medium-thickness plate is not enough high, especially in carbide formation area in Fe-C diagram, abnormal spherical carbides will occur and they are harmful for DWTT.
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Podhorná, Božena, Irena Andršová, Jana Dobrovská, Vlastimil Vodárek, and Karel Hrbáček. "Structure Stability of Ni-Base and Co-Base Alloys." Materials Science Forum 782 (April 2014): 431–36. http://dx.doi.org/10.4028/www.scientific.net/msf.782.431.

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This article summarises results of structure stability investigation of cast Ni-base and Co-base alloys after prolonged high temperature exposure at 900-1100 °C. Cast Ni (Co)-Cr-W-C alloys are resistant to high-temperature corrosion, due to high chromium content. Their heat resistance is caused by presence of carbides, which are stable at very high temperatures. Carbides precipitate in shape of large plate-like particles or carbide eutectics at casting cell boundaries, thus forming carbide skeleton of the alloy. Carbide morphology and temperature stability depends on chemical composition of the alloy, e.g. carbide content, type and content of carbide-forming elements. Microstructure changes were evaluated by stereological analysis and X ray-spectral microanalysis.
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Olena, Soroka, Rodichev Iuriy, Vorontsov Borys, and Protasov Roman. "Structural Strength of Cemented Carbides." Strojnícky časopis - Journal of Mechanical Engineering 71, no. 2 (November 1, 2021): 291–98. http://dx.doi.org/10.2478/scjme-2021-0035.

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Abstract The concept “structural strength of tool materials” got further development. The refusals of cemented carbide cutting plates, when heavy machining were analyzed. It was shown that 70…80% of refusals are the microchipping of cutting edges, tool cutting part chipping, cutting plate macrofracture. To assess cutting plate total carrying capacity and the influence of different methods of cemented carbides modification, bending tests were held. Local fracture resistance and damageability of cutting edge were assessed under its continuous scanning.
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Gao, Zhi Guo, Hua Wang, Yan Qing Feng, and Yi Sheng Zhao. "Steel-Bonded Cemented Carbide Cladding Prepared by Technological Combination of Powder Explosive Compaction and Liquid Sintering." Advanced Materials Research 308-310 (August 2011): 947–52. http://dx.doi.org/10.4028/www.scientific.net/amr.308-310.947.

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Steel-bonded cemented carbide sheet considered as cladding was successfully bonded with carbon steel plate by a technological combination of powder explosive compaction and liquid sintering. The microstructural interface between steel-bonded cemented carbide cladding and carbon steel plate was characterized by SEM, EDS analysis and hardness testing. The results showed that the gradient distributions of the elements Fe, C and W were found in the normal direction of the interface. The element W permeated about 100μm in depth through the side of carbon steel. The improved hardness of about 600～700HV of cladding was attributed to multiple carbides.
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Rasoolpoor, M., R. Ansari, and MK Hassanzadeh-Aghdam. "Dynamic behavior of particulate metal matrix nanocomposite plates under low velocity impact." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 234, no. 1 (September 17, 2019): 180–95. http://dx.doi.org/10.1177/0954406219875781.

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The main purpose of this work is to investigate low velocity impact behavior of metal matrix nanocomposite plates reinforced with silicon carbide nanoscale particles. First, a micromechanical model is proposed to predict the effective mechanical properties of metal matrix nanocomposites. Two features of the nanocomposite microstructure affecting the elastic properties, including agglomerated state of silicon carbide nanoparticles and size factor, are taken into account in the micromechanical simulation. Then, finite element method is used to analyze the time histories of contact force and center deflection of silicon carbide nanoparticle-reinforced metal matrix nanocomposite plates. Several detailed parametric studies are accomplished to explore the influence of volume fraction, diameter and dispersion type of silicon carbide nanoparticles, spherical impactor velocity and diameter, plate dimensions, as well as different boundary conditions on the dynamic response of metal matrix nanocomposite plates. The presented approach accuracy is verified with the available open literature results displaying a clear agreement. The results indicate that adding the silicon carbide nanoparticles into the metal matrix materials leads to a reduction in plate center deflection and an increase in contact force between the plate and projectile. Moreover, it is found that the nanoparticle agglomeration dramatically decreases the contact force and increases the center deflection of metal matrix nanocomposite plates.
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Jeong, H. W., I. S. Kim, S. M. Seo, Y. S. Yoo, B. G. Choi, and C. Y. Jo. "Characterization of an anomaly in the crystallographic orientation of plate-like carbides precipitated in a wrought Ni-base superalloy." Journal of Applied Crystallography 45, no. 4 (July 14, 2012): 719–25. http://dx.doi.org/10.1107/s002188981202599x.

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Face-centred cubic Cr-rich carbide is known to precipitate in a face-centred cubic matrix with a cube–cube orientation relationship, thereby minimizing the elastic strain energy. In the present study, for the first time, the precipitation was observed of an abnormal Cr-rich carbide, which did not have the cube–cube orientation relationship in its face-centred cubic matrix. The abnormally oriented carbides nucleated and grew around random grain boundaries, and were observed to have a lamellar or plate-like morphology. The crystallographic orientation anomaly was characterized by measuring the tilt angles of the three crystal poles of the matrices, carbides and adjacent grains, using a transmission electron microscope to find the closest coincidence site lattice boundary. The carbides showed a slight deviation from a cube–cube orientation with adjacent grains and did not present any particular orientational relationship with the matrix. The deviation angles from coincidence site lattice boundaries between the matrices and carbides were smaller than those between matrices and adjacent grains. The abnormally oriented carbides appeared to nucleate on adjacent grains, and underwent a rotation within the matrix during the initial stage of growth to release the phase boundary energy between the carbides and the matrix.
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Sheleg, V. K., A. N. Jigalov, and D. D. Bogdan. "Study on Effect of Aerodynamic Sound Hardening for Wear of Coated Carbide Metal Plates." Science & Technique 19, no. 4 (August 5, 2020): 271–79. http://dx.doi.org/10.21122/2227-1031-2020-19-4-271-279.

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To increase the durability of metal-cutting carbide plates operating during in harsh technological conditions with impact load, an aerodynamic sound hardening method has been developed that can increase a life of carbide tools up to 3.7 times with a small added cost. The wear of plates hardened by the aerodynamic sound method, after 100 min of cutting, is 1.12–1.7 times less than their un-strengthened analogues. A coating on metal carbide plates does not have a prevailing value when a tool is working with impact loads. While working with impact loads viscosity of an internal plate structure occurs the greatest influence on increasing resistance. For metal-cutting carbide plates during interrupted cutting with significant impact loads, a method of aerodynamic sound hardening is more effective than a coating method, not only in terms of tool performance, but also in the cost of completion itself. Empirical dependences of wear on the rear surface of carbide plates hardened by a aerodynamic sound method and plates with PVD coatings have been obtained in the form of approximation by polynomials of the 5th and 2nd degrees, which are convenient to use in a production environment. It has been revealed the higher carbide plate strength in bending leads to less influence of the method of aerodynamic sound hardening on the increase in wear resistance. So, taking into account the fact that for ВК8-base the ultimate bending strength is 1666 MPa, and for T5K10 it is 1421 MPa, wear reduction after hardening by the aerodynamic sound method for ВП3115-plates with ВК base is 11.5 %, while for ВП3225 – plates with ТК-base – 27.1 %.
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Ueda, Keiji, Nobuyuki Ishikawa, and Yasuhiro Murota. "Influence of Matrix Structure and Hard Carbide on Abrasive Resistance of Steel Plates." Materials Science Forum 706-709 (January 2012): 2342–47. http://dx.doi.org/10.4028/www.scientific.net/msf.706-709.2342.

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The microstructure of abrasion resistant steel plate usually consists of as quenched martensite, because harder matrix structure improves abrasion resistance of a steel plate. However hard martensitic material has lower formability, which is the important material property for fabricating machine parts. In this paper, a new type of abrasion resistant technique for steel plate is introduced. The steel provides good combination of high abrasion resistance and excellent formability without increasing hardness. The key technology to balance abrasion resistance and formability is the microstructural control of the ferritic matrix structure with dispersed extremely hard carbide particles. Basic research of abrasion mechanism revealed that abrasion resistance is strongly affected by the kind of carbides and the dispersed condition.
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Bishutin, Sergey, and Sergey Alehin. "Technological mode choice for silicon carbide plate diamond abrasion." Science intensive technologies in mechanical engineering 2020, no. 12 (December 31, 2020): 3–6. http://dx.doi.org/10.30987/2223-4608-2020-12-3-6.

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There is stated a choice of a technological mode for diamond abrasion ensuring a required process capacity and silicon carbide plate quality. The correlations of a silicon carbide removal rate with the length of surface micro-cracks with the roughness height of a surface are stated. A procedure is offered for setting technological modes which do not result in plate billet destruction during manufacturing special devices.
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Korobov, Yury, Yulia Khudorozhkova, Holger Hillig, Alexander Vopneruk, Aleksandr Kotelnikov, Sergey Burov, Prabu Balu, Alexey Makarov, and Alexey Chernov. "The Effect of Thickness on the Properties of Laser-Deposited NiBSi-WC Coating on a Cu-Cr-Zr Substrate." Photonics 6, no. 4 (December 13, 2019): 127. http://dx.doi.org/10.3390/photonics6040127.

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Ni/60WC coatings on copper substrate were placed via laser deposition (LD). A structural study was conducted using electron microscopy and a microhardness evaluation. Two body abrasive wear tests were conducted with a pin-on-plate reciprocating technique. A tool steel X12MF GOST 5960 (C-Cr-Mo-V 1.6-12-0.5-0.2) with a hardness of 63 HRC was used as a counterpart. The following results were obtained: Precipitation of the secondary carbides takes place in the thicker layers. Their hardness is lower than that of the primary carbides in the deposition (2425 HV vs. 2757 HV) because they mix with the matrix material. In the thin layers, precipitation is restricted due to a higher cooling rate. For both LD coatings, the carbide’s hardness increases compared to the initial mono-tungsten carbide (WC)-containing powder (2756 HV vs. 2200 HV). Such a high level of microhardness reflects the combined influence of a low level of thermal destruction of carbides during laser deposition and the formation of a boride-strengthening phase from the matrix powder. The thicker layer showed a higher wear resistance; weight loss was 20% lower. The changes in the thickness of the laser deposited Ni-WC coating altered its structure and wear resistance.
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Dissertations / Theses on the topic "Carbide plate"

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Barnes, Andrew Charles. "Characterization of High-Aspect Ratio, Thin Film Silicon Carbide Diaphragms Using Multimode, Resonance Frequency Analysis." Case Western Reserve University School of Graduate Studies / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=case1414844482.

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Чміль, Роман Євгенович. "Свердло з напайною твердосплавною пластиною." Master's thesis, Київ, 2018. https://ela.kpi.ua/handle/123456789/26719.

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Розглянуто форми різальних частин спіральних свердел, які використовуються в сучасному машинобудуванні. Розраховані зміни передніх, задніх кутів та товщини зрізуваного шару, для свердел з радіусною формою різальної частини та свердел зі зворотнім кутом при вершині вздовж різальної кромки. Встановлено, що свердло з радіусною формою різальної частини з радіусом при вершині 8 мм, має найсприятливіші геометричні параметри. Розроблено технологію для виготовлення свердла, з оптимізацією його виробництва. Розроблено стартап-проект ідеї даного свердла.
The forms of the cutting parts of the spiral drills, which are used in modern mechanical engineering, are considered. The changes of the front, rear angles and the thickness of the cutting layer, for drills with a radius shape of the cutting part and the drill with an angle with the apex along the cutting edge. It is established that the drill with a radius shape of the cutting part with a radius at an apex of 8 mm has the most favorable geometric parameters. A technological tool for manufacturing a drill with optimization of its production has been developed. A startup project of the idea of this drill was developed
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Martin, Samuel R. "Experimental Characterization of the Effect of Microstructure on the Dynamic Behavior of SiC." Thesis, Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/5024.

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For roughly fifteen years the military has sought to use the properties of ceramics for armor applications. Current high-performance ceramics have extremely high compressive strengths and low densities. One ceramic that has been shown to be highly resistant under ballistic impact is silicon carbide (SiC). It has been found that even within the silicon carbides, those manufactured by certain methods and those with certain microstructural properties have advantages over others. In order to understand the microstructural reasons behind variations in ballistic properties, plate impact tests were conducted on two sintered silicon carbides with slightly different microstructures. Two variations of a silicon carbide with the trade name Hexoloy SA were obtained through Saint Gobain. Regular Hexoloy (RH) and Enhanced Hexoloy (EH) are pressureless sintered products having exactly the same chemistries. EH went through additional powder processing prior to sintering, producing a final product with a slightly different morphology than RH. Samples of each were characterized microstructurally including morphology, density, elastic wavespeeds, microhardness, fracture toughness, and flexure strength. The characterization revealed differences in porosity distribution and flexure strength. It was determined that the porosity distribution in EH had fewer large pores leading to an 18% increase in flexural strength over that for RH. The focus of the mechanics of materials community concerning dynamic material behavior is to pin down what exactly is happening microstructurally during ballistic events. Several studies have been conducted where material properties of one ceramic type are varied and the dynamic behavior is tested and analyzed. Usually, from one variation to the next, several properties are different making it hard to isolate the effect of each. For this study, the only difference in the materials was porosity distribution. Plate impact experiments were conducted at the Army Research Laboratory (ARL) using the gas gun facilities within the Impact Physics Branch. A VISAR was utilized to measure free surface velocities. Tests were performed on each material to determine the Hugoniot Elastic Limit (HEL) and spall strength. Spall strength was measured as a function of impact stress, and pulse duration.
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Leray, Cedric. "Etude du comportement thermique et thermomécanique des récepteurs solaires sous haut flux radiatif." Thesis, Perpignan, 2017. http://www.theses.fr/2017PERP0003/document.

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Dans le contexte énergétique qui se profile, la production d’électricité par voie solaire thermodynamique s’avère une solution prometteuse, que ce soit pour des considérations économiques, d’échelle de production ou environnementales. Une voie d’amélioration du rendement des centrales solaires à tour consiste à utiliser des cycles thermodynamiques à haut rendement type cycles combinés. Cela nécessite de pouvoir fournir un fluide de travail pressurisé à très haute température (10bar et 1000°C minimum). Ce manuscrit présente les travaux menés afin de développer et de viabiliser un concept d’absorbeur solaire surfacique modulaire en céramique (carbure de silicium) capable de répondre à ces exigences. Le choix du carbure de silicium s’est imposé pour sa résistance aux hautes températures et aux problèmes d’oxydation. Cependant, l’utilisation d’une céramique comme matériau implique un risque de casse des modules. Les céramiques sont en effet fragiles lorsqu’elles sont soumises à des contraintes de traction. C’est la connaissance et la maitrise de ce risque qui fait l’objet de cette étude. L’approche adoptée combine le développement d’outils numériques et d’études expérimentales réalisées sur le site de la centrale solaire Thémis (Targassonne, 66, France). La méthodologie desimulation développée permet de prédire le comportement thermique et le comportement mécanique de l’absorbeur. Ceci permet de réduire les risques encourus par l’absorbeur et d’en connaitre les performances. Cette méthodologie a été éprouvée à l’aide des résultats expérimentaux
For the future, using thermodynamical solar power plant seems to be a good solution to ensure electrical production. Solar tower plants are able to produce electricity in significant amount, are environmentally friendly and economically competitive. One way to increase the yield of these plants is using high efficiency thermodynamical cycles, like combined cycle. That requires to providing a working fluid at high temperature and high pressure (10bar and 1000°C at least). This PHD thesis presents the works performed to develop and enhance a concept of modular plate solar ceramic absorber that can ensure the required air production. We chose the silicon carbide as material due to its resistance to high temperatures and oxidation problems. The drawback is ceramic modules are weak to traction stresses. The study focuses on the knowledge and the control of this phenomenon. This work combines the developments of numerical tools and experimental studies performed at Thémis power plant (Targassonne, 66, FRANCE). The numerical method permits simulations to predict the thermal behavior and the mechanical behavior of a solar module absorber. It allows the reduction of the mechanical stresses undergone by solar receiver and the prediction of its performances. This methodology was tested using experimental results
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Таран, Євгеній Сергійович. "Оправка розточна збірна." Bachelor's thesis, КПІ ім. Ігоря Сікорського, 2019. https://ela.kpi.ua/handle/123456789/31456.

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Метою дипломного проекту є проектування оправки розточної збірної, яка застосовується для обробки внутрішніх та зовнішніх циліндричних поверхонь, свердління отвору, точіння внутрішніх канавок та підрізання торця. Даний інструмент оснащений змінними твердосплавними пластинами, які надійно закріплені в корпусі інструменту. Також було проаналізовано конструкції інструментів для оброблення різних типів поверхонь, створене робоче креслення та 3D модель інструменту, розроблено технологію виготовлення і розраховано режими різання, вибрано та розраховано технологічне пристосування для фрезерування посадочних поверхонь під пластину з твердого сплаву, представлена керуюча програма для верстату з ЧПК та візуалізація процесу обробки.
The purpose of the diploma project is the design of the mandrel of the blade assembly, which is used for the treatment of internal and external cylindrical surfaces, drilling a hole, rolling the grooves and triming the ends. This tool is equipped with replaceable carbide plates, which are securely mounted in the tool casing. The structure of the tools for processing various types of surfaces was also analyzed, a working drawing and a 3D model of the tool were created, a production technology was developed and cutting patterns were calculated, a technological device for milling the landing surfaces under a solid alloy plate was selected and calculated, the control program for the CNC machine and visualization of the processing process are presented.
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Brun, François. "Modélisation du fonctionnement de la plante Arabidopsis thaliana dans différents contextes de disponibilité en N du sol : impact sur l'architecture racinaire." Paris 11, 2006. http://www.theses.fr/2006PA112256.

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Une limitation en azote occasionne des effets importants sur le développement et la croissance de la plante qui présente une réponse adaptative dans de telles conditions. La plasticité du système racinaire est un élément essentiel de cette réponse. L'objectif de la thèse est d'analyser la réponse du système racinaire à une limitation en azote en essayant de mieux prendre en compte l'ensemble du fonctionnement de la plante. Pour cela, nous avons choisi une démarche de modélisation pour simuler le fonctionnement de la plante entière chez Arabidopsis thaliana avec une forte explicitation de la mise en place du système racinaire dans des conditions contrastées de nutrition azotée. Des expérimentations ont été menées dans des conditions croisées de nutritions carbonée et azotée pour préciser ces effets sur le système racinaire et alimenter notre démarche de modélisation de la plante entière. L'étude se fait essentiellement sur un seul génotype, l'écotype Wassilewskija (Ws-0), et propose un cadre d'analyse pour une future exploration de la variabilité du comportement de génotypes
A nitrogen limitation causes important effects on the development and the growth of the plant that presents an adaptative response under such conditions. The plasticity of the root system is an essential element of this response. The objective of this study was to analyze the response of the root system to a nitrogen limitation by trying to take into account the whole plant functioning. We chose a modelling approach to simulate the whole plant functioning in Arabidopsis thaliana with a detailed description of the morphogenetic processes of the root system under contrasted nitrogen conditions. Experiments were carried out under cross conditions carbon and nitrogen nutritions to specify these effects on the root system architecture and to collect data for our modelling approach of the whole plant. Most of our study is on one genotype, the ecotype Wassilewskija (Ws-0), and proposes an analysis framework for future studies on genetic variability
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Larue, Camille. "Impact de nanoparticules de TiO2 et de nanotubes de carbone sur les végétaux." Phd thesis, AgroParisTech, 2011. http://pastel.archives-ouvertes.fr/pastel-00765312.

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Dans le contexte du développement exponentiel des nanotechnologies, les nanomatériaux sont susceptibles de se disséminer dans l'environnement. Les végétaux sont un élément sensible des écosystèmes car ils constituent une interface entre l'eau, le sol et l'air et se situent à la base de la chaine trophique. Cette étude avait pour but d'évaluer l'impact des nanoparticules de TiO2 et des nanotubes de carbone sur les végétaux, et plus particulièrement sur le blé et le colza. L'accent a également était mis sur la caractérisation des nanomatériaux employés. Nous avons mis en évidence l'accumulation racinaire et le transfert vers les feuilles des nanoparticules de TiO2 et des NTC dans le blé et le colza après une exposition en hydroponie. Les nanoparticules de TiO2 sont également accumulées dans les plantes lors d'une exposition racinaire sur sol ou encore lors d'une exposition par voie aérienne. Les nanoparticules de TiO2 s'accumulent dans les végétaux à hauteur de quelques dizaines voire centaines de mg Ti/kg MS, leur phase cristalline n'est pas modifiée et ces nanoparticules ne se dissolvent pas lors de leur transfert dans le végétal. Les NTC s'accumulent en plus faible quantité (centaines de µg NTC/kg MS) et il semble qu'ils soient altérés par le contact avec le végétal. Ces nanomatériaux affectent peu le développement des végétaux. Sur huit tests réalisés, seule l'élongation racinaire s'est révélée être un critère sensible, avec une induction de l'élongation pour les NPs et les NTC présentant le plus faible diamètre nominal. Enfin, une nette influence du diamètre nominal des nanomatériaux a pu être mise en évidence, contrôlant ainsi leur internalisation, leur transfert et leurs effets biologiques sur les végétaux.
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Pellan, Maxime. "Développement des joints de grain et des joints de phase dans les carbures cémentés WC-CO." Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GREAI121/document.

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Le carbure cémenté (WC-Co) est un système biphasé constitué de grains de carbure de tungstène enrobés dans un liant à base de cobalt. Dans ce matériau composite, qui allie donc la dureté du carbure à la résilience du cobalt, la maîtrise de la microstructure est un paramètre clef pour l’optimisation des propriétés mécaniques.Le but de ce travail est de mettre au jour les mécanismes régissant le développement des joint de grain et des joints de phase lors du frittage. L’effet de la teneur en liant, du taux de carbone et du temps de frittage ont été particulièrement étudiés.Ce travail est basée sur la caractérisation du matériau par EBSD (Electron BackScattered Diffraction), une méthode qui facilite la séparation des grains et donc l’utilisation de techniques d’analyse d’image pour étudier la microstructure. En outre un programme basé sur les données d’orientation des grains collectées par EBSD et permettant l’analyse de la texturation des joints de grain et des joints de phase a été développé pour cette étude.L’étude de la contiguité montre qu’elle ne dépend pas du taux de frittage ni de la teneur en carbone du liant, mais essentiellement de la fraction volumique de liant. Cela implique que l’encombrement et l’imbrication des particules sont les principaux paramètres entrant en compte dans l’établissement de la contiguité. Un grossissement plus rapide et plus marqué a été observé dans les échantillons riches en carbone, ainsi que dans ceux présentant un fort taux de liant. Un grossissement anormal a été observé dans les échantillons riches en carbone et à fort taux de liant. La désorientation aux joints de grains est caractérisée par un couple axe/angle décrivant la rotation liant les deux cristaux. L’étude de la distribution des axes a révélé que trois rotations sont particulièrement abondantes : celles autour de [101 ̅0], [21 ̅1 ̅0] et [0001]. Elles représentent environ 30% de la surface totale des joints de grains. Pour chacune des rotations particulières ont été détectées : [101 ̅0]/90°, [21 ̅1 ̅0] / (48°- 60°- 90°) et [0001]/90°. L’étude de la géométrie de ces joints suggère que leur remarquable stabilité est due au fort taux de cohérence dans le plan de joint. L’analyse statistique des plans de joint de grain et de joint de phase montre que la plupart d’entre eux correspond à un plan basal ou prismatique pour au moins l’un des deux grains (70% environ de la surface totale de joint de grain, et 50% environ de la surface totale de joint de phase). Sur la base de ces résultats, un scénario décrivant l’évolution de la microstructure durant le frittage est finalement proposé
WC-Co cemented carbide is a two phase system constituted of a cobalt based binder matrix embedding hard tungsten carbide grains. This material is especially used in fields such as metal cutting or mining, where high mechanical properties are required. Therefore, the microstructure is a key parameter to control to optimize the mechanical properties of the alloy.This work aims at understanding the mechanisms of grain boundary and phase boundary development during sintering, and how they may influence the final microstructure. The effect of the binder content, carbon content and sintering time was especially investigated.Electron BackScattered Diffraction characterization was chosen to conduct this study. First because the precise separation of grains in the resulting images makes possible automation of the measurements, and thus allows a statistical analysis of several microstructural parameters (as grain size, contiguity) on numerous samples. Secondly because orientation data collected by this way make possible the analysis of grain boundary and phase boundary texture. To this end, an automated method was developed for analysis of grain boundaries and estimation of remarkable boundary planes fraction from 2D EBSD measurements.The study of contiguity shows that it does not depend on sintering time or carbon content in the binder, but essentially of the carbide grain volume fraction. This result implies that impingement is the first order parameter in the evolution of contiguity. Grains appear to grow faster and in a larger extent in samples with a carbon rich binder, as well as in high binder content samples. Abnormal grain growth seems to be favored by high binder content in carbon rich samples. All grain boundaries were characterized by a couple of rotation axis and misorientation angle. Three particular rotation axes were identified: [101 ̅0], [21 ̅1 ̅0] and [0001]. They represent around 30% of the total grain boundary surface area. In addition, specific rotations were found to be particularly abundant in the microstructure: [101 ̅0]/90°, [21 ̅1 ̅0] / (48°- 60°- 90°) and [0001]/90°.A study of their geometry suggests that their stability would be due to a particularly coherent boundary plane. A statistical analysis shows that most grain boundaries and phase boundaries have a habit plane parallel to a basal or prismatic plane (about 70% of the total grain boundary surface area and 50% of the total phase boundary area. Finally, a scenario is proposed for the microstructure development model during sintering of cemented carbides on the basis of the results
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Kohler, Caroline. "Fonctionnement des communautés végétales et stocks de carbone en prairies bas-normandes." Caen, 2015. http://www.theses.fr/2015CAEN2073.

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Les prairies sont reconnues pour leur fort potentiel d’atténuation de la hausse en [CO2] atmosphérique via le stockage de carbone (C) dans le sol. À l’interface entre le sol et l’atmosphère, les communautés végétales régissent les entrées et sorties de C au sein de l’écosystème. Ce travail a pour objectif d’étudier l’impact de la composition fonctionnelle des communautés végétales sur les stocks et la répartition du C dans des prairies, ainsi que d’en évaluer les mécanismes sous-jacents. Nous avons étudié in situ les stocks de C dans le système plante-sol de 7 prairies du Domaine Expérimental du Pin-au-Haras et caractérisé la composition fonctionnelle de leurs communautés végétales. Cette étude montre que le fonctionnement des communautés végétales affecte les stocks de C dans le sol. Le LDMC (teneur en matière sèche des limbes) pondéré à l’échelle de la communauté s’est révélé être le meilleur indicateur du stock de C dans le sol. Les résultats mettent en évidence l’importance de l’âge des prairies : les prairies les plus anciennes sont moins productives et présentent un plus fort stock de C dans le sol que les prairies récentes plus productives. Elles sont également caractérisées par une quantité de C racinaire élevée, qui est positivement corrélée au stock de C organique du sol. La corrélation positive entre la teneur en glucides solubles des chaumes et la teneur en C soluble du sol au printemps suggère un impact de l’exsudation racinaire de glucides sur la qualité de la matière organique du sol et les micro-organismes. De manière générale, nos résultats soulignent la nécessité de trouver un compromis entre les services de production de fourrages et de stockage de C
Grasslands are recognized for their high potential to mitigate the increase in atmospheric CO2 concentrations through carbon (C) storage in soils. At the interface between the soil and the atmosphere, plant communities constitute a key component driving C inputs and C outputs in the ecosystem. This work aims to determine the impact of the functional composition of plant communities on C stocks and C distribution in grasslands, and to assess the underlying mechanisms. We studied in situ the C stocks in the plant-soil system of seven grasslands in an experimental farm in Normandy, and characterized the functional composition of the plant communities. This study shows that the functioning of plant communities affects soil C stocks. The LDMC (leaf dry matter content) community-weighted mean trait, proved to be the best indicator of soil C stocks. Overall, the results highlight the importance of the grassland age: the oldest and least productive grasslands have a higher soil C stock than the most recent and productive ones. The oldest grasslands are also characterized by a high root C amount, which is positively correlated with the soil organic C stock. The positive correlation between the stubble carbohydrate contents and the soluble soil C contents in spring suggests an impact of root carbohydrate exudation on the quality of soil organic matter and soil microbes C. Overall, our results highlight the need for a compromise between forage production and soil C storage
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Razakamanarivo, Ramarson Herintsitohaina. "Potentialités de stockage du carbone dans le système plante-sol des plantations d'eucalyptus des hautes terres malgaches." Montpellier SupAgro, 2009. http://www.theses.fr/2009NSAM0028.

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Les écosystèmes forestiers jouent un rôle important dans l’atténuation de la concentration du gaz carbonique (gaz à effet de serre) en raison des fortes quantités de carbone (C) stockées dans leur végétation et le sol. Cette capacité peut être toutefois affectée par différents facteurs, comme le type de forêt, le type d’espèces végétales, l’âge et le mode de gestion. Aussi, la caractérisation de cette fonction de stockage de C de ces écosystèmes forestiers est-elle primordiale. Dans ce contexte, le stockage de C dans les compartiments végétaux (aérien, racinaire et litière) et du sol des plantations d’eucalyptus (E) à courte durée de rotation (5 ans) a été étudié sur les Hautes Terres de Madagascar ; ce sont des plantations destinées à la production de bois d’énergie et de charbon de bois. Diverses situations sont étudiées : une chronoséquence de plantation d’eucalyptus (âge des souches de 17 à 111 ans, n = 41), des systèmes sous rotation culture/jachère (CJ, n = 6) et des systèmes sous système originel (pseudo-steppe et savane, B ; n = 7). Des mesures destructives de la biomasse aérienne et racinaire ont été réalisées dans ces situations ; un effort particulier a été porté sur la mesure de la biomasse racinaire de l’eucalyptus via la méthode du polygone de VoronoÉi. Des équations allométriques reliant la quantité de biomasse (aérienne et racinaire) de ces taillis d’eucalyptus aux variables dendrométriques (circonférence des souches, surface terrière des rejets) ont été développées. L’application de ces équations et la caractérisation du stock de C du sol (0-30 cm) ont montré que les plantations d’eucalyptus présentent un stock total de C élevé en comparaison aux autres modes d’usage des terres : 150, 8 Ø+ 25,3 Mg C ha-1 vs 112 Ø+15 pour B et 72,3Ø+9,9 Mg C ha-1 pour CJ. Ceci est en raison de la contribution importante du système racinaire (21,22 Mg C ha-1 dans la souche et 20,38 Mg C ha-1 dans les racines à é > 2 mm) et du sol (de l’ordre de 84,8 Mg C ha-1). L’analyse des relations entre les valeurs de stocks de C dans les différents compartiments de l’eucalyptus mesurés et les variables dendrométriques/spatiales effectuée dans cette étude a montré qu’il n’y a pas de corrélations significatives entre la durée de plantation et les stocks de C dans chaque compartiment d’une part et le C aérien et le C racinaire d’autre part. Ce sont des modèles d’arbre de régression qui ont permis de prédire les stocks de chaque compartiment avec : f (pente, circonférence, âge et densité des rejets) pour le C aérien (R2 = 0,74), f (variable intégrant à la fois la circonférence et la densité des souches, altitude, âge des souches) pour le C racinaire (R2 = 0,85) et f (altitude, pente, âge des souches) pour le C du sol (R2 = 0,61). L’application de ces modèles sur des couches spatiales des variables concernées préalablement établies à l’échelle d’une Commune Rurale des Hautes Terres malgaches (Sambaina) a permis de quantifier le stock de C sur une superficie de 1580 ha. Pour un stock total de 238 Ø+ 40 Gg C, 32 Ø+ 13 Gg C se trouvent dans la biomasse aérienne, 67 Ø+ 15 Gg dans la biomasse racinaire et 139 Ø+ 36 Gg C dans les 30 premiers centimètres du sol. Les résultats de ce travail ont montré que les plantations d’eucalyptus considérées dans cette étude permettent le stockage important de C. Ainsi les méthodologies et résultats acquis lors de cette étude seront-elles applicables à d’autres zones (comme les fronts d’afforestation), afin de valoriser ces nouvelles plantations d’eucalyptus sur le marché du C, en plein développement
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Books on the topic "Carbide plate"

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P, Bansal Narottam, and NASA Glenn Research Center, eds. In-plane and interlaminar shear strength of a unidirectional hi-nicalon fiber-reinforced celsian matrix composite. [Cleveland, Ohio]: National Aeronautics and Space Administration, Glenn Research Center, 2000.

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P, Bansal Narottam, and NASA Glenn Research Center, eds. In-plane and interlaminar shear strength of a unidirectional hi-nicalon fiber-reinforced celsian matrix composite. [Cleveland, Ohio]: National Aeronautics and Space Administration, Glenn Research Center, 2000.

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P, Bansal Narottam, and NASA Glenn Research Center, eds. In-plane and interlaminar shear strength of a unidirectional hi-nicalon fiber-reinforced celsian matrix composite. [Cleveland, Ohio]: National Aeronautics and Space Administration, Glenn Research Center, 2000.

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P, Bansal Narottam, and NASA Glenn Research Center, eds. In-plane and interlaminar shear strength of a unidirectional hi-nicalon fiber-reinforced celsian matrix composite. [Cleveland, Ohio]: National Aeronautics and Space Administration, Glenn Research Center, 2000.

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Parker, Philip M. The World Market for Unmounted Tool Plates, Sticks, and Tips of Sintered Metal Carbides or Cermets: A 2007 Global Trade Perspective. ICON Group International, Inc., 2006.

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Parker, Philip M. The 2007 Import and Export Market for Unmounted Tool Plates, Sticks, and Tips of Sintered Metal Carbides or Cermets in China. ICON Group International, Inc., 2006.

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The World Market for Unmounted Tool Plates, Sticks, and Tips of Sintered Metal Carbides or Cermets: A 2004 Global Trade Perspective. Icon Group International, Inc., 2005.

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Book chapters on the topic "Carbide plate"

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Brezeanu, M., M. Badila, G. Brezeanu, F. Udrea, C. Boianceanu, G. Amaratunga, and K. Zekentes. "Theoretical Study of an Effective Field Plate Termination for SiC Devices Based on High-k Dielectrics." In Silicon Carbide and Related Materials 2005, 1087–90. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-425-1.1087.

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Kumta, A., E. Rusli, and Chin Che Tin. "Design and Analysis of a Dual-Step Field-Plate Terminated 4H-SiC Schottky Diode Using SiO2/High-K Dielectric Stack." In Silicon Carbide and Related Materials 2005, 1171–74. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-425-1.1171.

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Zuanetti, Bryan, Tianxue Wang, and Vikas Prakash. "Dynamic Failure of Pure Tungsten Carbide Under Simultaneous Compression and Shear Plate Impact Loading." In Dynamic Behavior of Materials, Volume 1, 163–70. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-30021-0_28.

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Jayaraj, Jayamani, Jae Ho Han, Sang Whan Park, Ki Bae Kim, and Eric Fleury. "Potential of Cr2AlC Ternary Carbide as Material for Bipolar Plate in PEMFC." In Solid State Phenomena, 927–30. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/3-908451-31-0.927.

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Starke, Ulrich. "Non-Basal Plane SiC Surfaces: Anisotropic Structures and Low-Dimensional Electron Systems." In Silicon Carbide, 375–94. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2011. http://dx.doi.org/10.1002/9783527629053.ch15.

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Epelbaum, Boris M., Octavian Filip, and Albrecht Winnacker. "Bulk and Epitaxial Growth of Micropipe-Free Silicon Carbide on Basal and Rhombohedral Plane Seeds." In Silicon Carbide, 33–61. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2011. http://dx.doi.org/10.1002/9783527629053.ch2.

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Zhang, Ze Hong, and Tangali S. Sudarshan. "Growth of Low Basal Plane Dislocation Density SiC Epitaxial Layers." In Silicon Carbide and Related Materials 2005, 243–46. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-425-1.243.

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Zhang, Ze Hong, A. E. Grekov, Priyamvada Sadagopan, S. I. Maximenko, and Tangali S. Sudarshan. "Performance of Silicon Carbide PiN Diodes Fabricated on Basal Plane Dislocation-Free Epilayers." In Silicon Carbide and Related Materials 2005, 371–74. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-425-1.371.

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Agarwal, Anant, Sumi Krishnaswami, James Richmond, Craig Capell, Sei Hyung Ryu, John Palmour, Bruce Geil, Dimos Katsis, Charles J. Scozzie, and Robert E. Stahlbush. "Influence of Basal Plane Dislocation Induced Stacking Faults on the Current Gain in SiC BJTs." In Silicon Carbide and Related Materials 2005, 1409–12. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-425-1.1409.

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Zhang, Ze Hong, A. Shrivastava, and Tangali S. Sudarshan. "Why Are Only Some Basal Plane Dislocations Converted to Threading Edge Dislocations During SiC Epitaxy?" In Silicon Carbide and Related Materials 2005, 419–22. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-425-1.419.

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Conference papers on the topic "Carbide plate"

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Holmquist, T. J., and T. J. Vogler. "The response of silicon carbide and boron carbide subjected to shock-release-reshock plate-impact experiments." In DYMAT 2009 - 9th International Conferences on the Mechanical and Physical Behaviour of Materials under Dynamic Loading. Les Ulis, France: EDP Sciences, 2009. http://dx.doi.org/10.1051/dymat/2009016.

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Bishutin, Sergey, and Sergey Alehin. "TRIBOLOGICAL ASPECTS OF DIAMOND-ABRASIVE PROCESSING OF SILICON CARBIDE PLATES." In PROBLEMS OF APPLIED MECHANICS. Bryansk State Technical University, 2020. http://dx.doi.org/10.30987/conferencearticle_5fd1ed047fb069.67714622.

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The article considers diamond-abrasive grinding of silicon carbide plates as a tribological system in order to increase the productivity and quality of this processing, as well as to substantiate the directions of its improvement. The process of removing material from the workpiece is considered as a result of abrasive wear of the silicon carbide plate on the lap with loose abrasive. Based on the hypothesis of F. Preston, a dependence was obtained for calculating the rate of removal of material removed during processing from the surface of the workpiece. The results of experimental studies of the productivity and quality of processing are presented. Attention is paid to the formation of surface layers of silicon carbide plates by introducing abrasive particles into the workpiece, causing the formation of multidirectional microcracks and the removal of material mainly as a result of brittle fracture. The results of experimental studies of the state of surface layers using a digital 3-D microscope VHX-1000E, a scanning electron microscope Jeol JSM 6610 and a profiler-profilometer "Mahr GmbH" Based on the research results, recommendations were formulated to improve the efficiency of diamond-abrasive processing of silicon carbide plates.
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Glaeser, Thorsten, Axel Demmer, and Fritz Klocke. "Liquid-Phase Sintering of Tungsten Carbide-Cobalt by Laser Radiation." In ASME 2008 9th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2008. http://dx.doi.org/10.1115/esda2008-59534.

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Laser Sintering is a powder metallurgical process. The principle of Laser Sintering is based on a local densification of powdered materials as a result of the absorption of laser radiation. Through a cyclic repetition of material application, densification and the lowering of a build-up plate, a three dimensional geometry develops. Within the Laser Sintering (liquid-phase sintering) of tungsten carbide-cobalt (WC-Co) the low melting material, the metal binder phase cobalt, is temporarily transferred into the liquid phase. The high melting WCphase is not melted and remains fine dispersed in the metal binder phase after cooling of the material.
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Yatsko, D. S., I. G. Zhevtun, D. S. Pivovarov, and O. V. Dudko. "Investigation for interaction of laser radiation with a titanium plate on adding of titanium carbide powder." In HIGH-ENERGY PROCESSES IN CONDENSED MATTER (HEPCM 2019): Proceedings of the XXVI Conference on High-Energy Processes in Condensed Matter, dedicated to the 150th anniversary of the birth of S.A. Chaplygin. AIP Publishing, 2019. http://dx.doi.org/10.1063/1.5117455.

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Sathish, T., D. Bala Subramanian, R. Saravanan, and V. Dhinakaran. "Experimental investigation of temperature variation on flat plate collector by using silicon carbide as a nanofluid." In PROCEEDINGS OF INTERNATIONAL CONFERENCE ON RECENT TRENDS IN MECHANICAL AND MATERIALS ENGINEERING: ICRTMME 2019. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0024965.

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Tonge, Andrew L., and Brian E. Schuster. "The Role of Inclusions in the Failure of Boron Carbide Subjected to Impact Loading." In 2019 15th Hypervelocity Impact Symposium. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/hvis2019-056.

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Abstract This work investigates the importance of the microstructure of boron carbide for initiating inelastic deformation under impact conditions. Simple loading resulting from a flyer plate impact geometry is used to illustrate the importance of microstructure for the well-controlled and easily instrumented experimental geometry. A second set of simulations is performed on a miniaturized impact geometry to investigate the importance of the microstructure for the early stages of semi-infinite penetration for impact velocities between 0.9 km/s and 1.9 km/s. The effect of the microstructure is more pronounced for the flyer plate impact geometry.
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Beal, Aaron, Dave Dae-Wook Kim, Kyung-Hee Park, and Patrick Kwon. "A Comparative Study of Carbide Tools in Drilling of CFRP and CFRP-Ti Stacks." In ASME 2011 International Manufacturing Science and Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/msec2011-50114.

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A comparative study was conducted to investigate drilling of a titanium (Ti) plate stacked on a carbon fiber reinforced plastic panel. The effects on tool wear and hole quality in drilling using micrograin tungsten carbide (WC) tools were analyzed. The experiments were designed to first drill CFRP alone to create 20 holes. Then CFRP-Ti stacks were drilled for the next 20 holes with the same drill bit. This process was repeated until drill failure. The drilling was done with tungsten carbide (WC) twist drills at two different speeds (high and low). The feed rate was kept the same for each test, but differs for each material drilled. A Scanning Electron Microscope (SEM), and a Confocal Laser Scanning Microscope (CLSM), were used for tool wear analysis. Hole size and profile, surface roughness, and Ti burrs were analyzed using a coordinate measuring system, profilometer, and an optical microscope with a digital measuring device. The experimental results indicate that the Ti drilling accelerated WC flank wear while CFRP drilling deteriorated the cutting edge. Entry delamination, hole diameter errors, and surface roughness of the CFRP plate became more pronounced during drilling of CFRP-Ti stacks, when compared with the results from CFRP only drilling. Damage to CFRP holes during CFRP-Ti stack drilling may be caused by Ti chips, Ti adhesion on the tool outer edge, and increased instability as the drill bits wear.
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Nandhakumar, S., P. P. Sethusundaram, and G. N. Ganeshan. "Numerical analysis of composite layered ballistic plate made of boron carbide, titanium diboride and ultra high molecular weight polyethylene." In INTERNATIONAL CONFERENCE ON MATERIALS, MANUFACTURING AND MACHINING 2019. AIP Publishing, 2019. http://dx.doi.org/10.1063/1.5117967.

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Bhunia, Avijit, and Chung-Lung Chen. "Closed Loop Impingement Cooling System for High Power Density Electronic Devices." In ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-33729.

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Liquid jet and droplet impingement cooling of the 1cm2 base plate area of a 1mm2 Silicon carbide diode is reported. DI water flowing from a single or two-orifice injection port of diameter 118–130μm at a rate of 4.5–15ml/min, impinges on the diode base plate and undergoes phase change. For practical implementation of liquid impingement cooled electronic devices, a closed loop system with a recovery scheme for the vapor and the excess liquid is developed. Boiling of the thin liquid film on the base plate surface is observed at a superheat of 10°C, measured at a location 3.2mm away from the diode footprint area on the base plate, and a maximum phase change heat transfer effectiveness of 39%. The effects of liquid flow rate, and injection pattern (single or two-orifice) on the heat transfer and the diode current-voltage characteristics are investigated.
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Salem, Jonathan A., Noel N. Nemeth, Lynn M. Powers, and Sung R. Choi. "Reliability Analysis of Uniaxially Ground Brittle Materials." In ASME 1995 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1995. http://dx.doi.org/10.1115/95-gt-031.

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The fast fracture strength distribution of uniaxially ground, alpha silicon carbide was investigated as a function of grinding angle relative to the principal stress direction in flexure. Both as-ground and ground/annealed surfaces were investigated. The resulting flexural strength distributions were used to verify reliability models and predict the strength distribution of larger plate specimens tested in biaxial flexure. Complete fractography was done on the specimens. Failures occurred from agglomerates, machining cracks, or hybrid flaws that consisted of a machining crack located at a processing agglomerate. Annealing eliminated failures due to machining damage. Reliability analyses were performed using two and three parameter Weibull and Batdorf methodologies. The Weibull size effect was demonstrated for machining flaws. Mixed mode reliability models reasonably predicted the strength distributions of uniaxial flexure and biaxial plate specimens.
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Reports on the topic "Carbide plate"

1

Triola, Christopher, Candace Joggerst, Ching-Fong Chen, Timothy Foley, and David Jablonski. Simulations of Sweeping Wave Propagation in a Boron Carbide Plate. Office of Scientific and Technical Information (OSTI), November 2020. http://dx.doi.org/10.2172/1711337.

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