Готові списки джерел за темами / BFN Ceramic

Добірка наукової літератури з теми "BFN Ceramic"

Автор: Grafiati
Опубліковано: 6 вересня 2023

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Статті в журналах з теми "BFN Ceramic"

1

Bochenek, D., and P. Niemiec. "Technology and Properties of Ferroelectromagnetic Lead–Free BFN–Ferrite Composites." Archives of Metallurgy and Materials 58, no. 4 (December 1, 2013): 1405–9. http://dx.doi.org/10.2478/amm-2013-0184.

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Abstract A lead free ceramic composite 0.9BaFe0:5Nb0:5O3-0.1Ni0:5Zn0:5Fe2O4 (BFN-NZF) with ferroelectromagnetic properties have been obtained in presented work. Ceramic composite powder obtained from the simple oxides Fe2O3, Nb2O5, ZnO, NiO and barium carbonate BaCO3. The composition of the composite was chosen so that the ratio of the BFN and NZF components was 90:10. The synthesis of components of BFN-NZF composite was performed using the calcination method. Final densification of synthesized powder has been done using free sintering. The XRD, the microstructure, EDS and dielectric investigations were performed. For comparison of the BFN ceramic and the BFN-NZF composites, temperature and frequency impedance research was conducted. Relaxation phenomena were observed at temperatures above 235°C in the BFN ceramic and above 150°C in the BFN-NZF composite. Obtained results show the coexistence of ferroelectric and magnetic properties. Such properties of obtained composites give the possibility to use them in magnetoelectric transducers.
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2

Kar, Subrat, and Pawan Kumar. "Permittivity and modulus spectroscopic study of BaFe0.5Nb0.5O3 ceramics." Processing and Application of Ceramics 7, no. 4 (2013): 181–87. http://dx.doi.org/10.2298/pac1304181k.

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Ba(Fe0.5Nb0.5)O3 (BFN) powder was synthesized in single perovskite phase by conventional solid state reaction route and BFN ceramic was obtained by uniaxial pressing and sintering at 1350?C. Complex immittance like: permittivity and modulus spectroscopic formalism were simultaneously used to explain dielectric behaviour of the ceramics. The activation energy calculated from dielectric relaxation below 100?C was found to be ~ 0.19 eV. The activation energy obtained from modulus spectra above 100?C was ~0.59 eV. The space charge polarization model was used to explain the origin of relaxation and ?giant? permittivity of BFN ceramics near room temperature.
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3

Bochenek, Dariusz, Joanna A. Bartkowska, Lucjan Kozielski, and Izabela Szafraniak-Wiza. "Mechanochemical Activation and Spark Plasma Sintering of the Lead-Free Ba(Fe1/2Nb1/2)O3 Ceramics." Materials 14, no. 9 (April 27, 2021): 2254. http://dx.doi.org/10.3390/ma14092254.

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This paper investigates the impact of the technological process (Mechanochemical Activation (MA) of the powder in combination with the Spark Plasma Sintering (SPS) method) on the final properties of lead-free Ba(Fe1/2Nb1/2)O3 (BFN) ceramic materials. The BFN powders were obtained for different MA duration times (x from 10 to 100 h). The mechanically activated BFN powders were used in the technological process of the BFN ceramics by the SPS method. The measurements of the BFNxMA ceramic samples included the following analysis: Scanning Electron Microscopy (SEM), Energy Dispersive Spectrometry (EDS), DC electrical conductivity, and dielectric properties. X-ray diffractions (XRD) tests showed the appearance of the perovskite phase of BFN powders after 10 h of milling time. The longer milling time (up 20 h) causes the amount of the perovskite phase to gradually increase, and the diffraction peaks are more clearly visible. Short high energy milling times favor a large heterogeneity of the grain shape and size. Increasing the MA milling time to 40 h significantly improves the microstructure of BFN ceramics sintered in the SPS technology. The microstructure becomes fine-grained with clearly visible grain boundaries and higher grain size uniformity. Temperature measurements of the BFN ceramics show a number of interesting dielectric properties, i.e., high values of electric permittivity, relaxation properties with a diffusion phase transition, as well as negative values of dielectric properties occurring at high temperatures. The high electric permittivity values predestines the BFNxMA materials for energy storage applications e.g., high energy density batteries, while the negative values of dielectric properties can be used for shield elements against the electromagnetic radiation.
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4

Sonia, S., Mallam Chandrasekhar, and Pawan Kumar. "Microwave assisted sol-gel synthesis of high dielectric constant CCTO and BFN ceramics for MLC applications." Processing and Application of Ceramics 11, no. 2 (2017): 154–59. http://dx.doi.org/10.2298/pac1702154c.

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Ba(Fe1/2Nb1/2)O3 (BFN) and CaCu3Ti4O12 (CCTO) ceramic powders were synthesized by microwave assisted sol-gel synthesis technique and sintered at 1100?C and 1000?C, respectively. Calcination and sintering processes were carried out in a microwave furnace. Dielectric constant (?r)~2450 and dielectric loss (tan ?)~0.5 at frequency of 1 kHz and 20?C were observed for the BFN ceramic samples. Higher value of ?r ~ 3600 and lower value of tan ? ~ 0.07 at frequency of 1 kHz and in 20-60?C temperature range for the CCTO ceramic samples suggested its utility for MLC applications. Sharp decrease of ?r and sharp increase of tan ? at higher frequencies of BFN ceramic samples indicated the presence of Debye like relaxation.
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5

INTATHA, URAIWAN, SUKUM EITSSAYEAM, and TAWEE TUNKASIRI. "GIANT DIELECTRIC BEHAVIOR OF BaFe0.5Nb0.5O3 PEROVSKITE CERAMIC." International Journal of Modern Physics B 22, no. 25n26 (October 20, 2008): 4717–23. http://dx.doi.org/10.1142/s0217979208050462.

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Single-phase cubic Ba ( Fe , Nb )0.5 O 3 (BFN) powder was synthesized by solid-state reaction at 1443 K for 4 hour in air. X-ray diffraction indicated that the BFN oxide mixture calcined at 1200°C crystallizes to the pure cubic perovskite phase. BFN ceramics were produced from this powder by sintering at 1623–1673 K for 4 hrs in air. Samples prepared under these conditions achieved up to 94.7% of the theoretical density. The temperature dependence of their dielectric constant and loss tangent, measured at difference frequencies, shows an increase in the dielectric constant with temperature which is probably due to disorder on the B site ion of the perovskite. Non-Debye type of relaxation phenomena has been observed in the BFN ceramics as confirmed by Cole–Cole plots. The higher value of ɛ′ at the lower frequency is explained on the basis of the Maxwell–Wagner (MW) polarization model.
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6

SUTJARITTANGTHAM, KRIT, SUKUM EITSSAYEAM, KAMONPAN PENGPAT, GOBWUTE RUJIJANAGUL, TAWEE TUNKASIRI, GANNAGA SATITTADA, and URAIWAN INTATHA. "STRUCTURAL AND PIEZOELECTRIC PROPERTIES OF (1 − x)PZT-xBFN (x = 0.1 – 0.2) SOLID SOLUTION." International Journal of Modern Physics B 22, no. 25n26 (October 20, 2008): 4724–29. http://dx.doi.org/10.1142/s0217979208050474.

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The structural, dielectric and piezoelectric properties of (1 − x) PbZr 0.52 Ti 0.48 O 3– xBaFe 0.5 Nb 0.5 O 3 ceramic system with the composition near the morphotropic phase boundary were investigated as a function of the BaFe 0.5 Nb 0.5 O 3 content by X-ray diffraction (XRD), dielectric measurement and piezoelectric measurement techniques. Studies were performed on the samples prepared by solid state reaction for x = 0.10, 0.12, 0.14, 0.16, 0.18 and 0.20. The XRD analysis demonstrated that with increasing BFN content in (1 − x) PZT −x BFN , the structural change occurred from tetragonal to the mixture of tetragonal and cubic phase. Changes in the dielectric behavior and piezoelectric properties were found to relate with these structural changes depending on the BFN contents.
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7

Maimon, H., Sukum Eitssayeam, Uraiwan Intatha, Tawee Tunkasiri, and G. Satittada. "Phase Evolution and Physical Properties of (1-x)BZT-xBFN Ceramic System." Advanced Materials Research 55-57 (August 2008): 53–56. http://dx.doi.org/10.4028/www.scientific.net/amr.55-57.53.

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Phase evolution and physical properties of (1-x)BZT–xBFN ceramic system were investigated to find the optimum condition for electronic applications. (1-x)BZT–xBFN powders were prepared by solid state reaction technique varying x from 0.2 to 0.8 and various sintering temperatures from 1350 °C to 1450 °C. Phase formation was investigated by X-ray diffraction technique. The XRD analysis demonstrated that with increasing BFN content in (1−x)BZT–xBFN, the structural change occurred from the tetragonal to the cubic phase at room temperature. Changes in the physical and mechanical properties were then related to this structural transformation depending on the BFN content.
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8

Bochenek, Dariusz, Przemysław Niemiec, Artur Chrobak, Grzegorz Ziółkowski, and Artur Błachowski. "Magnetic and electric properties of the lead free ceramic composite based on the BFN and ferrite powders." Materials Characterization 87 (January 2014): 36–44. http://dx.doi.org/10.1016/j.matchar.2013.10.027.

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9

Rerak, Michał, Jolanta Makowska, Małgorzata Adamczyk-Habrajska, and Lucjan Kozielski. "Impedance Spectroscopy of Pr-Doped BaBi2Nb2O9 Aurivillius Ceramics." Materials 15, no. 18 (September 11, 2022): 6308. http://dx.doi.org/10.3390/ma15186308.

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Herein this study, the polycrystalline nature of the Aurivillius type structure is studied; primarily, the main objective is to observe the influence of dopant Pr3+ at the Ba2+-site of BaBi2Nb2O9 (BBN) ceramics. The ceramics under investigation were fabricated via the conventional solid-state reaction method. Scanning electron microscopy (SEM) and energy dispersion spectroscopy (EDS) techniques were used to analyse their morphological structure. It was found that the chemical composition of the ceramic samples corresponds well to the initial stoichiometry of the ceramic powders. An increase in praseodymium content caused a slight decrease in the average size of the ceramic grains. The obtained ceramic materials are described by a tetragonal structure with the space group I4/mmm. The electrical properties of the material have been studied using complex impedance spectroscopy methods in wide temperature and frequency ranges. The analysis of obtained results showed grains and grain boundaries contribute to conductive processes in the material. A possible ’hopping’ mechanism for electrical transport processes in the system is evident from the analysis of results based on Joncher law.
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10

Intatha, Uraiwan, K. Sathitada, Sukum Eitssayeam, Kamonpan Pengpat, Gobwute Rujijanagul, P. Thavornyuttakarn, and Tawee Tunkasiri. "Effects of Potassium Fluoride Salt Additive on the Sintering Temperature and Dielectric Properties of BaFe0.5Nb0.5O3 Ceramics." Advanced Materials Research 55-57 (August 2008): 885–88. http://dx.doi.org/10.4028/www.scientific.net/amr.55-57.885.

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BaFe0.5Nb0.5O3 (BFN) exhibits very high dielectric constant over a wide temperature range. However, these materials normally require high-temperature sintering to achieve a maximum densification. The aim of this study is to determine the effect of potassium fluoride salt on the sintering and dielectric properties of BFN ceramics. The results show that KF additive lower the sintering temperature by 100-200°C without affecting the formation of BFN phase. Ceramics doped with 1% KF show optimum densities of about 95% of the theoretical value when sintered at 1300°C. The addition of fluoride salt in the BFN ceramics causes very broad dielectric constant curves over a wide temperature range indicating the diffuse phase transition characteristic. Furthermore, this addition also reduces in the dielectric loss when compared with pure BFN ceramics
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Дисертації з теми "BFN Ceramic"

1

Yang, Bin [Verfasser]. "Adhesion of adhesive resin cements to dental zirconia ceramic and human dentin / Bin Yang." Kiel : Universitätsbibliothek Kiel, 2009. http://d-nb.info/1019813326/34.

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2

Rude, Mathew Ben. "Translations." Thesis, Montana State University, 2007. http://etd.lib.montana.edu/etd/2007/rude/RudeM0507.pdf.

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Form, line, and surface are the catalysts for my work. I have been constructing nonrepresentational forms from clay that I see as translations. They are reflective of my conversation with the material and a record of the firing. The pieces in the installation do not reference any specific object. They are my attempt to explore volume, line, scale, and repetition in objects designed to translate the process of wood firing. They are about physicality, passion, and process. Each object becomes an individual variation of the total process. Most forms and objects created in art have some reference to some other preexisting object and can have any variety of meanings attached to them. I know the viewer will create their own meaning and metaphor for this installation. My intention is to leave the specifics up to the viewer.
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3

Islam, Mohammad Mazharul. "Mechanisms of ion migration in ceramic oxides." [S.l. : s.n.], 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=976678578.

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4

Stieger, Gregor. "Covalent and heterosupramolecular interaction of ceramic particles." Stuttgart : Univ, 2002. http://www.bsz-bw.de/cgi-bin/xvms.cgi?SWB10347431.

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5

Martelle, Holly Anne. "Huron potters and archaeological constructs researching ceramic micro-stylistics /." online access from Digital Dissertation Consortium access full-text, 2002. http://libweb.cityu.edu.hk/cgi-bin/er/db/ddcdiss.pl?NQ69090.

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6

Prior, Ruth. "Early historic ceramics from Tra Kieu, central Vietnam : typological and petrographic characterisation." Thesis, University College London (University of London), 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.343960.

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7

Zbären, Christoph Oliver. "The effect of thermal cycling on metal-ceramic bond strength /." [S.l.] : [s.n.], 2009. http://opac.nebis.ch/cgi-bin/showAbstract.pl?sys=000288150.

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8

Lee, Ho-Rim. "Comparative study of bond characteristics between titanium-titanium alloy and ceramic." [S.l.] : [s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=972776354.

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9

Tam, Anlam Chi Lam. "Abrasive wear properties of ceramic particulates (Al₄C₃) reinforced al-based composites." access abstract and table of contents access full-text, 2002. http://libweb.cityu.edu.hk/cgi-bin/ezdb/dissert.pl?msc-ap-b21175068a.pdf.

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Thesis (M.Sc.)--City University of Hong Kong, 2002.
At head of title: City University of Hong Kong, Department of Physics and Materials Science, Master of Science in materials technology and management dissertation. Title from title screen (viewed on Sept. 4, 2006) Includes bibliographical references.
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10

Grohmann, Philipp Alfred Charles. "Effect of zirconia surface treatments on the shear strength of zirconia/veneering ceramic composites /." [S.l.] : [s.n.], 2008. http://opac.nebis.ch/cgi-bin/showAbstract.pl?sys=000279108.

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Книги з теми "BFN Ceramic"

1

Xin bian quan ben ji mu zang tao(ying yin ben). Beijing: Zhong hua ban, 1998.

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2

Chen, Shenghong. Qian zai yi shi: Shi Dabin Han fang hu ta ben ti yong ce kao. Beijing Shi: Zhonghua shu ju, 2012.

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3

Vincent, Brian. Prehistoric ceramics of Northeastern Thailand: With special reference to Ban Na Di. Oxford, England: B.A.R., 1988.

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4

Danto, Arthur Coleman. Howard Ben Tré. New York: Hudson Hills Press in association with the Scottsdale Museum of Contemporary Art, 1999.

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5

Labbé, Armand J. Prehistoric Thai ceramics: Ban Chiang, Lopburi, and Khok Phanom Di and related sites in regional cultural perspective. Bangkok, Thailand: White Lotus Press, 2002.

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6

Zain, Shukri. Sumbangsih Shukri Zain: Kumpulan sebahagian dari ucapan, ceramah, drama televisyen, drama radio, drama tatu, sajak, lirik, dan langgam suara Pehin Orang Kaya Ratna Diraja Dato Seri Utama Dr. Md. Zain bin Haji Serudin. Bandar Seri Begawan, Brunei Darussalam: Dewan Bahasa dan Pustaka Brunei, Kementerian Kebudayaan Belia dan Sukan, 1988.

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7

Tsur, Ronit. Ben ha-kisaʼot. 2005.

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8

Danto, Arthur C. Howard Ben Tre. Hudson Hills Press, 2000.

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9

Limited, Rapra Technology, BNF Fulmer, and British Ceramic Research Limited, eds. New materials for automotive applications: Papers from a two-day seminar organised by BNF Fulmer, British Ceramic Research Limited and Rapra Technololgy Limited, 10th and 11th October 1990. Rapra Technology, 1990.

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10

May, Crystal. Funny Gifts : Eat Sleep Pottery Repeat Ceramics Clay Art Potter Nice Nice: Pottery, Gifts for Her, Him - Funny Gifts for Women, Gifts for Men - Best Friend, Friend Gifts, BFF Gifts, Coworker Gifts - Friendship, Christmas, Fun Birthday Gifts,Schedule. Independently Published, 2021.

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Частини книг з теми "BFN Ceramic"

1

Grigoryev, L. V., A. A. Semenov, and P. Yu Belyavskiy. "The Investigation of Optical and Dielectric Properties of Ferroelectric BSN Ceramics Doped with Rare-Earth Elements." In Springer Proceedings in Materials, 191–201. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-45120-2_17.

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2

Tria, Djalel Eddine. "Advanced Multi-Layered Protective Systems for Defeating High Energy Projectiles." In Critical Energy Infrastructure Protection. IOS Press, 2022. http://dx.doi.org/10.3233/nicsp220009.

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This study aims to investigate experimentally and numerically the ballistic trauma absorption of different armor ceramics with aramid composite reinforcement. The studied ceramic materials include homogeneous alumina oxide, with different Al2O3 contents, alumina-mullite and reaction-bonded boron carbide (RBBC) ceramics where their composition, structure, and main mechanical properties are examined and analyzed. Likewise, the penetration behavior of a 7.62x39 mm Mild Steel Cored (MSC) bullet from an AK round and 7.62x51 Full Metal Jacket (FMJ) bullets was studied, since the selected armors are often subjected to such particular threats in personal body armor systems. Three dimensional FE models of the bullets and armor plates were developed to study the penetration behavior of the bullets, the fracture pattern of ceramics and to predict the Back Face Deformation (BFD) of the considered armors. It was found that the studied armors have been proved to have very acceptable protection levels due to the measured ballistic trauma, which was in accordance with standard NIJ-0101.06. Also, despite the total erosion of the 7.62x51 mm FMJ bullet during the penetration process, it has the highest recorded ballistic trauma. Blunting and mushrooming of the 7.62x39 mm MSC bullets leads to decreasing of its intrusion in the armor plates. The combination of the constitutive relations and the FE algorithms has successfully matched details of impact tests for the bullets and the armor plates that lead to the explanation of the dispersion of the BFD measures for each impact situation. The propagation of radial and circumferential cracks, fracture conoid formation has been well predicted for alumina ceramics. The highest BFD values were shown in the RBBC ceramics with the absence of residual fracture conoid after the impact.
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3

Devi, Sheela, Venus Dillu, and Mekonnen Tefera Kebede. "Synthesis and Characterization of NanoBismuth Ferrites Ceramics." In Smart and Advanced Ceramics and Applications [Working Title]. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.104777.

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Multiferroic nanomaterials bear draw attention plenty consideration on account of the mixture of two or more determinants, in the way that ferroelectricity, ferromagnetism, and ferroelasticity, giving an expansive range of professional, depressed capacity, environmentally intimate request. Nano-bismuth ferrite (BiFeO3, BFO) exhibits two together (anti) ferromagnetic and ferroelectric real estate at room temperature. Therefore, it bears risk a very influential part fashionable the multiferroic foundation. This review focuses ahead of the progress of nano-BFO objects, containing unification, facial characteristics, structures, and potential uses of multiferroic order accompanying novel functions. Hopes and danger happen all investigated and made clear. We hope that this review will be a part of a review and encourage more research workers to win accompanying nano-BFO results.
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4

Zinad, Omar, Csilla Csiha, and Alya’a Abas Al-Attar. "Cost Analysis of Sustainable Concrete Production Using Waste Nanoparticles." In Társadalom – gazdaság – természet: szinergiák a fenntartható fejlődésben (Konferenciakötet), 585–93. Soproni Egyetem Kiadó, 2023. http://dx.doi.org/10.35511/978-963-334-450-7_s11_zinad_et_al.

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In building constructions, considering sustainability, there is an increased interest in a reduction in landfills, converting waste materials into nanomaterials by using for example waste materials like waste grain wheat, waste ceramic, and slag, decreasing thus also the price of production of concrete and enhancing the properties of construction products. This article will focus on using waste ceramic powder and blast furnace slag as replacements for cementitious materials. “Conventional concrete” (Cc) is produced by mixing 100% cement + sand + water whilst “Sustainable concrete” (Sc) is produced from a mix of sand + water + 47.5 % cement+ 50% of waste-based Supplementary Cementitious Materials (SCMs) consisting of 25 % of Waste Ceramic Powder (WCP) and 25% of Blast Furnace Slag (BFS) ) +2.5% of nano SiO2. This article makes an economic comparison between these two types of concrete, showing that whilst the cost of 1 m3 Cc is approximately 100 $, the cost of 1 m3 Sc is 60 $, having the same mechanical properties. By using Sc for construction works leads to saving huge quantities of raw material used for cement production. The economic evaluation showed savings in cost around 40% by partial substitution of cement with waste-based/reused cementitious materials, being a promising result for a sustainable construction industry.
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5

Wickham, Chris. "Egypt." In The Donkey and the Boat, 25–150. Oxford University PressOxford, 2023. http://dx.doi.org/10.1093/oso/9780198856481.003.0002.

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Abstract Egypt was the strongest and most complex economy in the medieval Mediterranean, probably up to the Black Death. It had areas of specialist flax-growing, and many towns specialized in linen production. Movements of goods to and along the Nile were large-scale and overlapping. Egypt’s capital, Fusṭāṭ-Cairo, was the largest city in the Mediterranean. The state was oppressive, but also strong and well-organized. We can say a great deal about the Egyptian economy because of the survival of thousands of private letters in Arabic, in both Hebrew and Arabic script (the former surviving in the geniza of the Ben Ezra synagogue in the capital). Egyptian archaeology is less developed, but what we can say from it about the ceramic and wine trade along the Nile fits with what the geniza letters tell us about flax, and what Arabic-script letters tell us about almost everything. All of this tells us about the internal complexity of the economy, and that Egypt, although it engaged extensively in Mediterranean trade, only really needed timber and iron from abroad.
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6

Mittal, Divyansh, Daljeet Singh, and Sandan Kumar Sharma. "Thermal Characteristics and Tribological Performances of Solid Lubricants: A Mini Review." In Advanced Rheology and Its Applications [Working Title]. IntechOpen, 2023. http://dx.doi.org/10.5772/intechopen.109982.

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Solid lubricants separate two moving surfaces and reduce wear. Materials’ ability to act as solid lubricants depends on their characteristics relative to contact surfaces. Chemically stable fluorides (BaF2, CaF2), boron nitride (h-BN), transition metallic sulphides (MoS2, WS2), soft metals (Au, Ag), binary and multi-component oxides, such as silver-containing sulphates, chromates, and oxides, and MXenes are effective solid lubricants. Solid lubrication depends on the material’s structure. Structure, mechanical properties, chemical reactivity, and kind of substance characterise these materials (refractories, ceramics, glass, etc.). High temperatures (>300°C) are obtained at asperities due to frictional heat produced when two surfaces rub. High temperatures can breakdown lubricants, but the resulting compounds must be lubricants; otherwise, corrosive vapours or abrasive solids can occur. High thermal conductivity helps lubricants remove heat generated by rubbing. Lubricants must not be melted, as the solid will lose strength and distort or be removed like liquid. Tensile strength, compressibility, and hardness are significant mechanical qualities for solid lubricants in extreme conditions. This chapter discusses solid lubricants and their structure. Also discussed are solid lubricants’ mechanical and thermal properties. The lubricating mechanism and conclusion are also conferred.
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7

Hoffmann, Roald. "Science and Crafts." In Roald Hoffmann on the Philosophy, Art, and Science of Chemistry. Oxford University Press, 2012. http://dx.doi.org/10.1093/oso/9780199755905.003.0026.

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I came to Penland to write. The craft s were dear to me; first textiles, especially bobbin lace, which my wife made and collected, and taught me to look at. Then the Japanese ceramics to which Kenichi Fukui and Fred Baekeland introduced me. Followed by the protochemistry of dyeing with indigo from snail and plant sources, to me still the ideal bridge between science and culture. The tribute is to be seen around my house—my children’s inheritance consumed as much by crafts as “high” art. So it was easy to accept an invitation to come to Penland and write. Who knew what would come—I wanted to write poems, perhaps an essay. For the poems I’ve needed nature—not so much to write about as to shake me loose from the everyday worries of the (exciting) daily life I had in Ithaca. Nature was a path to concentration; I expected to find a different nature in the foothills of the Blue Ridge Mountains. I would watch the crafts process. Maybe someone would even let me try something. Or ask me to tell them of the chemistry of their craft. I, in turn, would craft my poems out of the green hills. But this is not what happened; here’s what happened: I walk into Billie Ruth Sudduth’s basketry class, and there’s the whole group dyeing their canes, steaming pots of synthetic dye. I ask someone what they are doing, and she says, “Well, I’m getting ready for the upsetting,” and then seeing the puzzled look on my face, patiently explains this old, wonderfully direct basketry term for bending the canes forming the base of a basket over themselves, so that they stand up. I walk uphill to the iron shop, clearly more of a macho place, watch an intense young man, lawyer become sculptor as it turns out, hammer out a hand on a swage block. Ben tells me that it’s possible to burn away the carbon in the steel, and the iron would “burn” too, oxidize, in too hot a flame.
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Тези доповідей конференцій з теми "BFN Ceramic"

1

Abubakarov, A. G., I. A. Verbenko, L. A. Reznichenko, and Y. M. Noykin. "BSN — Ceramics — Advanced radar-absorbing material." In 2017 Radiation and Scattering of Electromagnetic Waves (RSEMW). IEEE, 2017. http://dx.doi.org/10.1109/rsemw.2017.8103595.

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Shao, Huifeng, Zhuoluo Jing, Rougang Zhou, Zhiheng Nian, Haiqiang Liu, Youping Gong, and Yong He. "Manufacturing of Biodegradable Intramedullary Nail With High Strength." In ASME 2021 16th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/msec2021-63654.

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Abstract Intramedullary nails (INs) have significant advantages in rigid fracture fixation. Conventional metal INs for long bone fracture fixation often lead to delay union or even nonunion healing due to their stress shielding effect and lack of biological activity. Besides, undegradable metals require a second surgery to remove them, which will not only impose a potential risk to the patient but also cause additional costs. Manufacturing high-strength biodegradable INs (BINs) is still a challenge. Here, an entirely new type of high-strength bioactive magnesium-containing silicate (CSi-Mg) BIN is manufactured by using casting, freeze drying and sintering technique. It has extremely high bending strength (> 41 MPa) and stable internal and external structure. We have systematically studied the influence of parameters such as the paste component, freeze drying process, and sintering process on the mechanical strength involved in the manufacturing process. According to our manufacturing method, a wide range of inorganic ceramic implants and BINs with different sizes can also be fabricated. The CSi-Mg BIN also has good bioactivity and biodegradation property. This bioceramic BIN and manufacturing process are expected to be applied to a variety of orthopedic medical devices. This novel bioactive BIN is expected to replace the traditional metal IN and become a more effective way of treating fracture.
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3

Jones, Eric L., Sergey Yarmolenko, Devdas Pai, and Jag Sankar. "Mechanical Property Study of the Fiber-Matrix Interface in SiC/SiC Composites." In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-15428.

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The fiber-matrix interface between ceramic fibers and ceramic matrix plays a major role in the fatigue properties and toughness of continuous fiber reinforced ceramic matrix composites (CMCs). Boron Nitride (BN) is a widely used fiber coating material that provides a weak bond between the fiber and matrix. A weak fiber-matrix interface increases the strength and toughness of the overall CMC. Single fiber push-out tests were performed to study interfacial shear strength as a main parameter defining fatigue properties and toughness of SiC/SiC composites. The fiber-matrix interfacial shear strength was studied in melt infiltrated Hi-Nicalon/BN(CVI)/SiC composites exposed to various temperature and loading conditions, similar to those that are used in actual applications. Hi-Nicalon fibers with diameters of 13-14.5 μm were pushed out from samples with thicknesses ranging from 125-280 μm using a spherical tip with a 1 μm radius and 90° conical shape. Interfacial shear strength was calculated from sliding load, fiber diameter and sample thickness. Due to significant scattering, 30 individual push tests in every sample were used to obtain the average interfacial shear strength. The virgin sample has a shear strength of 20 MPa which is higher than tensile tested samples (12 MPa). Annealing of a virgin specimen for 100 hours at 1000°C slightly increased shear strength up to 21.5 MPa while annealing at 1100°C and 1200°C led to significant increase of shear strength up to 29 and 39 MPa correspondingly. This effect is associated with BN degradation at temperatures >1000°C.
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4

Pialago, Edward Joshua, Xi Ru Zheng, Kristian Arvin Ada, Oh Kyung Kwon, Dong An Cha, and Chan Woo Park. "A Study on the Effects of Ceramic Content of CNT / Metal Composite Surface Coatings Fabricated by Cold Spray for Boiling Heat Transfer Enhancement." In ASME 2012 Third International Conference on Micro/Nanoscale Heat and Mass Transfer. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/mnhmt2012-75261.

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In this study, the enhancement of boiling heat transfer through surface modification of heat transfer materials by surface coating was investigated. Specifically, the study evaluated how the boiling heat transfer performance of CNT/metal composite coatings, fabricated by the cold gas dynamic spray process, was affected by the addition of different ceramic particles on the raw materials of these surface coatings. These raw materials were composite powders of CNT, Cu powder, and ceramic powders (SiC, AlN, and BN) that were mechanically alloyed using an attrition ball mill. The boiling heat transfer tests were performed in a pool of R134a at a gauge pressure of 2.5 kg/cm2 and liquid temperature of 4.8°C. Test results showed that the addition of ceramic particles in the CNT/Cu composite powders can further augment boiling heat transfer. The augmented boiling heat transfer performance varied with the kind of ceramic powder added and with their quantity. The highest enhancement ratio was 2.57. This was exhibited by a Cu plate specimen that was cold spray coated with (5 vol.% CNT + 95 vol.% Cu) + 20 vol.% AlN composite powder.
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Ruggles-Wrenn, M. B., N. J. Boucher, and C. P. Przybyla. "Fatigue of Advanced SiC/SiC Ceramic Matrix Composites at Elevated Temperature in Air and in Steam." In ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/gt2018-75051.

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High-temperature mechanical properties and tension-tension fatigue of three SiC/SiC ceramic composites are discussed. Effects of steam on high-temperature fatigue are evaluated. The three composites consist of a SiC matrix reinforced with SiC (Hi-Nicalon™) fibers. Composite 1 was processed by chemical vapor infiltration (CVI) of SiC into fiber preforms coated with BN. Composite 2 had an oxidation inhibited matrix consisting of alternating SiC and B4C layers and was processed by CVI. Fiber preforms were coated with pyrolytic carbon with B4C overlay. Composite 3 had a melt-infiltrated (MI) matrix consolidated by combining CVI-SiC with SiC particulate slurry and molten Si infiltration. Fiber preforms were coated with BN. Tension-tension fatigue was investigated at 1200°C in air and in steam. Steam significantly degraded the fatigue performance of composites 1 and 3, but had little influence on the fatigue performance of composite 2. Composite microstructure, as well as damage and failure mechanisms were investigated.
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6

Sơn, Nguyễn Thanh. "Vật liệu ceramic tân tiến và động cơ tua bin khí cho máy bay thế hệ mới". У Japan Science and Technology 2021. SCIENCE AND TECHNICS PUBLISHING HOUSE, 2021. http://dx.doi.org/10.15625/vap.2021.0003.

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7

Leivo, E. M., T. H. Kellberg, P. M. J. Vuoristo, T. A. Mäntylä, and M. J. Kolari. "Structure and Thermal Conductivity of Flame Sprayed Polyamide 11 Coatings Filled With Al2O3, AIN and BN Ceramics." In ITSC2001, edited by Christopher C. Berndt, Khiam A. Khor, and Erich F. Lugscheider. ASM International, 2001. http://dx.doi.org/10.31399/asm.cp.itsc2001p0327.

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Abstract Polymer ceramic composite coatings were applied by flame spraying on preheated steel substrates. Polyamide (PA 11, nylon) powder was blended with alumina (Al2O3), aluminium nitride (AIN) or boron nitride (BN) powder with two different filler content to increase thermal conductivities of polymer coatings. Morphologies and particle sizes of polyamide and filler powders were examined by scanning electron microscope and laser scattering methods. Coating structures and thicknesses of composite coatings were studied by the polished cross sections. Thermal conductivities were measured by hot disc method. Thermal conductivities of polyamide coatings increased from 30 % up to few times by blending ceramic filler material on PA 11 powder. Structures of composite coatings were dense and filler materials were clearly observed in polyamide matrix.
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8

Bian, Liu-Gang, Xian-Fa Ai, and Kang Yan. "Quench Effects on Structural and Electrical Properties of the BFO-BT Based Lead-Free Piezoelectric Ceramics." In 2022 16th Symposium on Piezoelectricity, Acoustic Waves, and Device Applications (SPAWDA). IEEE, 2022. http://dx.doi.org/10.1109/spawda56268.2022.10045892.

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9

DiCarlo, James A., Hee Mann Yun, Gregory N. Morscher, and Ramakrishna T. Bhatt. "Progress in SiC/SiC Ceramic Composite Development for Gas Turbine Hot-Section Components Under NASA EPM and UEET Programs." In ASME Turbo Expo 2002: Power for Land, Sea, and Air. ASMEDC, 2002. http://dx.doi.org/10.1115/gt2002-30461.

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The successful application of ceramic matrix composites as hot-section components in advanced gas turbine engines will require the development of constituent materials and processes that can provide the material systems with the key thermostructural properties required for long-term component service. Much initial progress in identifying these materials and processes was made under the former NASA Enabling Propulsion Materials Program using stoichiometric Sylramic™ silicon-carbide (SiC) fibers, 2D-woven fiber architectures, chemically vapor-infiltrated (CVI) BN fiber coatings (interphases), and SiC-based matrices containing CVI SiC interphase over-coatings, slurry-infiltrated SiC particulate, and melt-infiltrated (MI) silicon. The objective of this paper is to discuss the property benefits of this SiC/SiC composite system for high-temperature engine components and to elaborate on further progress in SiC/SiC development made under the new NASA Ultra Efficient Engine Technology Program. This progress stems from the recent development of advanced constituent materials and manufacturing processes, including specific treatments at NASA that improve the creep, rupture, and environmental resistance of the Sylramic fiber as well as the thermal conductivity and creep resistance of the CVI SiC over-coatings. Also discussed are recent observations concerning the detrimental effects of inadvertent carbon in the fiber-BN interfacial region and the beneficial effects of certain 2D-architectures for thin-walled SiC/SiC panels.
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10

Robertson, Taylor, Xiao Huang, and Rick Kearsey. "Multilayered Fibre-Matrix Interphases Derived From the Electrophoretic Deposition of Ceramic Nano-Powders." In ASME Turbo Expo 2022: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/gt2022-81166.

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Abstract A significant challenge within the manufacturing of Ceramic Matrix Composites (CMCs) is the creation of the fibre-matrix interphase which enables the damage tolerant behavior of CMCs. Chemical vapour deposition (CVD) has been a highly successful approach for fabricating fibre-matrix interphases; however, CVD requires capital intensive facilities and hazardous precursors. This work examines electrophoretic deposition (EPD) as an alternative route for the production of fibre-matrix interphases. Four multilayered fibre-matrix interphases (SiC/Al2O3, BN/ZrO2, ZrC/85wt%Al2O3-15wt%ZrO2, and SiC/Si3N4/SiC) were produced through multi-staged electrophoretic deposition of ceramic nano-powders upon SiC fibre bundles. A 25-2 factorial design of experiments is utilized to explore the effect of different levels of the following variables: electric field strength, duration, surfactant, solids loading and binder. Following deposition of the fibre-matrix interphase the fibre bundles are thinly coated with a SiC matrix through a reactive melt infiltration technique. The resultant microcomposites are then subjected to tensile loading until failure to determine which coating and deposition combination are the most likely to yield favorable tensile properties. Additional microscopy is performed to determine the uniformity and thickness of the coatings. The results are then examined to evaluate the suitability of electrophoretic deposition as a production technique for fibre-matrix interphase coatings in CMCs.
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Звіти організацій з теми "BFN Ceramic"

1

Pierce, J. L., L. P. Zawada, and J. M. Staehler. Fracture Behavior of a Si3N4-BN Fibrous Monolith Ceramic. Fort Belvoir, VA: Defense Technical Information Center, April 2001. http://dx.doi.org/10.21236/ada388839.

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