Relevant bibliographies by topics / Sialon ceramic heat treatment

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Academic literature on the topic 'Sialon ceramic heat treatment'

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Published: 4 June 2021
Last updated: 10 February 2022

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Journal articles on the topic "Sialon ceramic heat treatment"

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Falk, L. K. L. "SiAlON Microstructures." Key Engineering Materials 403 (December 2008): 265–68. http://dx.doi.org/10.4028/www.scientific.net/kem.403.265.

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This paper is focussed on the development of microstructure during liquid phase sintering and post-densification crystallisation heat treatment of ceramic materials based on the α- and β-Si3N4 structures. Grain shape and size distributions, assessed by quantitative microscopy in combination with stereological methods, and fine scale microstructures, investigated by electron diffraction and high resolution imaging and microanalysis in the transmission electron microscope, are discussed in relation to the fabrication process and the overall composition of the ceramic material.
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Demir, Adem, and Derek P. Thompson. "Effect of Fibre Heat-Treatment on Nicalon SiC Fibre Reinforced β-SiAlON Matrix Composites." Materials Science Forum 554 (August 2007): 141–46. http://dx.doi.org/10.4028/www.scientific.net/msf.554.141.

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Nicalon SiC fibre tows have excellent properties for ceramic matrix reinforcement but residual oxygen within the fibres degrades fibre properties when these are incorporated into ceramic matrices at elevated temperatures. β-SiAlON ceramics also have excellent mechanical and physical properties, especially fracture toughness. However, sintering of β-SiAlON is generally carried out at 1650-1750°C, considerably higher than the temperatures above which fibre degradation occurs (>1200°C). In the present study, the refractoriness and strength of Nicalon fibres were improved by high pressure CO heat treatment, and densification temperatures of β-SiAlON were lowered by using different kinds of sintering additives. Heat-treatment of the fibres under 45 bar CO pressure at 1500-1650°C led to an increase in fibre strength and to the formation of a thin carbon layer on the surface of the fibres. These improvements in the Nicalon SiC fibres allowed them to be incorporated successfully into β-SiAlON matrices. The as-received and heat-treated fibres were infiltrated with β-SiAlON starting powder mixes and hot-pressed with low temperature sintering additives at 1600-1700°C for 30 min. Bending strength and fracture toughness measurements showed that samples containing heat-treated fibres provided a significant strength and fracture toughness increase compared with similar samples prepared using as-received fibres, and massive pull-out was observed because of the weak interface resulting from the surface carbon coating on the fibres.
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Falk, L. K. L., Yvonne Menke, and Stuart Hampshire. "SiAlON B-Phase Glass-Ceramic Microstructures." Key Engineering Materials 403 (December 2008): 103–6. http://dx.doi.org/10.4028/www.scientific.net/kem.403.103.

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This paper is focussed on the development of microstructure during crystallisation heat treatment of B-phase parent glasses with composition (e/o) 35R:45Si:20Al:83O:17N, where R = Er, Yb, Y or a mixture of Y and Yb. Extensive high resolution analytical transmission electron microscopy has shown that the lenticular B-phase crystals take up a substantial range of composition. The element R is always clearly anti-correlated with the Si, and a larger R3+ cation radius moves the composition range to lower R contents. It is suggested that a locally increased density in the bi-dimensional network of randomly oriented (Si,Al)(O,N)4 tetrahedra is associated with an increased density of vacancies in the R3+ cation lattice.
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Ye, Feng, Mikio Iwasa, Caili Su, and Sheng Chen. "Self-reinforced Y-α-sialon ceramics with barium.aluminosilicate as an additive." Journal of Materials Research 18, no. 10 (October 2003): 2446–50. http://dx.doi.org/10.1557/jmr.2003.0340.

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Y-α-sialons (Y0.333Si10Al2ON15) were prepared by hot pressing using 5 wt.% BaAl2Si2O8 as an additive. The results showed that barium aluminosilicate not only.served as a liquid-phase sintering aid to promote densification, but also facilitated the.development of elongated α-sialon grains. The obtained self-toughened α-sialon was.both hard and tough. The Vickers hardness, flexural strength, and fracture toughness.are 18.9 GPa, 802 MPa, and 6.0 Mpam1/2, respectively. Post heat treatment could.promote the growth of elongated α-sialon grains, hence further increasing its.toughness.
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Souza, José Vitor C., O. M. M. Silva, E. A. Raymundo, and João Paulo Barros Machado. "Microstructural and Mechanical Properties Changes of Silicon Nitride Based Ceramic Using Post-Sintering Heat Treatment." Materials Science Forum 727-728 (August 2012): 1085–91. http://dx.doi.org/10.4028/www.scientific.net/msf.727-728.1085.

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Si3N4based ceramics are widely researched because of their low density, high hardness, toughness and wear resistance. Post-sintering heat treatments can enhance their properties. Thus, the objective of the present paper was the development of a Si3N4based ceramic, suitable for structural applications, by sintering in nitrogen gas pressure, using AlN, Al2O3, and Y2O3as additives and post-sintering heat treatment. The green bodies were fabricated by uniaxial pressing at 80 MPa with subsequent isostatic pressing at 300 MPa. The samples were sintered at 1900°C for 1 h under N2gas pressure of 0.1 MPa. Post-sintering heat treatment was performed at 1500°C for 48 h under N2gas pressure of 1.0 MPa. From the results, it was observed that after post-sintering heat treatment there was a reduction of α-SiAlON phase and increase of β-Si3N4phase, with consequent changing in grain size, decrease of fracture toughness and increase of the Vickers hardness.
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Chen, Wei-wu, Wei-ying Sun, Ya-wen Li, and Dong-sheng Yan. "Microstructure of (Y + Sm)–α-sialon with a-sialon seeds." Journal of Materials Research 15, no. 10 (October 2000): 2223–27. http://dx.doi.org/10.1557/jmr.2000.0319.

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(Y + Sm)–α-sialon compositions with and without α-sialon seeds were hot-pressed at 1800 °C for 1 h and then heat treated at 1800 °C for 4 h. The effect of α-sialon seeds on the microstructures of (Y + Sm)–α-sialon ceramics was studied by scanning electron microscopy. The results showed that hot-pressed α-sialon ceramics with elongated grains can be fabricated by adding 10 wt% seeds. Through heat treatment, the seed-free composition could also develop into a similar microstructure with big elongated grains dispersed in a fine matrix.
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Pugh, M. D., L. C. Zarnon, and R. A. L. Drew. "Heat Treatment of Controlled Composition Y-Sialon Ceramics." Canadian Metallurgical Quarterly 31, no. 3 (July 1992): 211–16. http://dx.doi.org/10.1179/cmq.1992.31.3.211.

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BROWN, I. W. M., G. C. BARRIS, C. M. SHEPPARD, W. J. TROMPETTER, and I. C. VICKRIDGE. "USE OF IBA TECHNIQUES FOR THE MEASUREMENT OF OXIDATION PROCESSES IN SIALON CERAMICS." Modern Physics Letters B 15, no. 28n29 (December 20, 2001): 1305–13. http://dx.doi.org/10.1142/s0217984901003202.

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Sialon ceramics (Si-Al-O-N) are high performance engineering materials used as cutting tools and wear parts whose performance may be compromised by high temperature oxidation. Ion Beam Analysis (IBA) techniques, coupled with X-ray Diffraction, have been used to monitor oxidation processes in dense bodies of α/β-sialon, X-sialon and O-sialon subjected to heat treatment schedules in air to induce surface oxidation. This has permitted depth profiling of Si, Al, Y, O, & N in the sialon bodies, enabling direct comparison of oxidation resistance to be made between the different sialon compositions.
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Shen, Zhijian, Daniel Ashkin, Oleg Babushkin, and Thommy Ekstrm. "Melilite Formation in a Samarium-Stabilized α-Sialon Ceramic during Postsintering Heat Treatments." Journal of the American Ceramic Society 80, no. 3 (March 1997): 817–21. http://dx.doi.org/10.1111/j.1151-2916.1997.tb02909.x.

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Mandal, Hasan, and Derek P. Thompson. "Optimization and Improvement of Sialon Ceramics with New Heat Treatment Techniques." Key Engineering Materials 132-136 (April 1997): 984–89. http://dx.doi.org/10.4028/www.scientific.net/kem.132-136.984.

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Dissertations / Theses on the topic "Sialon ceramic heat treatment"

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Guéroult, Bertrand. "Influence de la microstructure sur la resistance a l'usure des ceramiques : etude de traitements post-frittage et developpement d'un essai de rayage." Paris, ENMP, 1987. http://www.theses.fr/1987ENMP0094.

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On a cherche a mettre en evidence les differents effets de la microstructure et des proprietes intrinseques des materiaux etudies (al::(2)o::(3), sic, sialon) sur les mecanismes d'enlevement de matiere lors de l'usure par frottement a sec. Des modifications microstructurales ou morphologiques ont ete tentees par divers traitements de frittage ou de post-frittage. En particulier, on a etudie les effets du pressage isostatique chaud et de l'implantation ionique sur les proprietes mecaniques et tribologiques du sialon fritte. On a developpe un essai de rayage pour remplacer les essais d'indentation mal adaptes du fait du role joue par les debris d'usure consideres comme un troisieme corps. On a etudie les mecanismes creant ces debris ou les faisant evoluer. Il apparait que le rayage et l'usure des ceramiques, deux phenomenes lies a la creation de debris (avec ou sans circulation), doivent etre consideres comme faisant appel principalement au caractere plastique de debris agglomeres
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Ibrahim, Hamdy Ibrahim. "Bioresorbable Magnesium-Based Bone Fixation Hardware: Alloy Design, Post-Fabrication Heat Treatment, Coating, and Modeling." University of Toledo / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1503678544356525.

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Kassam, Tahsin Ali. "The effects of Alumina purity, TICUSIL® braze preform thickness and post-grinding heat treatment on the microstructure, mechanical and nanomechanical properties of Alumina-to-Alumina brazed joints." Thesis, Brunel University, 2017. http://bura.brunel.ac.uk/handle/2438/15311.

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Alumina-to-alumina brazed joints were formed using 96.0 and 99.7 wt.% Al2O3 ceramics in as-ground and in ground and heat treated conditions using TICUSIL® (68.8Ag-26.7Cu-4.7Ti wt.%) braze preforms of thicknesses ranging from 50 to 250 μm. Brazing was conducted in a vacuum of 1 x 10-5 mbar at 850 °C for 10 minutes. Joint strengths were evaluated using four-point bend testing and were compared to the flexural strengths of standard test bars according to ASTM C1161-13. Post-grinding heat treatment, performed at 1550 °C for 1 hour, did not affect the average surface roughness or grain size of either grade of alumina but affected their average flexural strengths, with a small increase for 96.0 wt.% Al2O3 and a small decrease for 99.7 wt.% Al2O3. Post-grinding heat treatment led to secondary phase migration, creating a fissured 96.0 wt.% Al2O3 surface. This affected the reliability of 96.0 wt.% Al2O3 brazed joints, in which braze infiltration was observed. As the TICUSIL® braze preform thickness was increased from 50 to 150 μm, the average strengths of both 96.0 and 99.7 wt.% Al2O3 brazed joints improved. This occurred due to a microstructural evolution, in both sets of joints, which was studied using SEM, TEM and nanoindentation techniques. An increase in the TICUSIL® braze preform thickness increased the amount of Ti which was available to diffuse to the joint interfaces. This led to increases in both, reaction layer and braze interlayer thicknesses. Excess Ti in joints that were made using TICUSIL® braze preforms thicker than 50 μm, led to relatively hard Cu-Ti phases in an Ag-Cu braze interlayer. Cu-Ti phase formation, which may have reinforced joint strength whilst also reducing CTE mismatch at the joint interface, also led to Ag-rich braze outflow at the joint edges. Brazed joints made using as-ground 96.0 wt.% Al2O3 consistently outperformed brazed joints made using as-ground 99.7 wt.% Al2O3, due to the formation of Ti5Si3 phases at locations where the Ti-rich reaction layer intersected with the triple pocket grain boundary regions of the as-ground 96.0 wt.% Al2O3 surface.
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Silva, Emília Adriane. "Tratamento térmico em bases de bráquetes monocristalinos silicatizados e silanizados: efeito na adesão ao esmalte." Universidade Federal de Juiz de Fora, 2011. https://repositorio.ufjf.br/jspui/handle/ufjf/2056.

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O objetivo deste trabalho foi avaliar o efeito do tratamento térmico na adesão de bráquetes monocristalinos silanizados após processo de silicatização. O estudo foi autorizado pelo comitê de ética da Universidade Federal de Juiz de Fora, parecer número 161/2010. Sessenta bráquetes de alumina monocristalina (Pure®, Orthotechnology, Tampa, FL, EUA) e sessenta dentes pré-molares superiores recém extraídos com finalidade ortodôntica foram randomicamente divididos em três grupos (n=20) de acordo com a estratégia de tratamento das superfícies adesivas: G1- sem tratamento (grupo controle); G2- jateamento com partículas de alumina revestidas por sílica-30 µm Cojet (3M ESPE, Irvine, CA, EUA) + aplicação do silano Monobond S (Ivoclar Vivadent, Shaan, Liechtenstein); e G3- jateamento com Cojet seguido de silanização e tratamento térmico da superfície com jato de ar (Secador Taiff Compacto Turbo, 6000W, São Paulo, SP) à 100ºC±1, a 1 cm por 60 s. Após os tratamentos de superfície, os bráquetes foram colados aos dentes com o adesivo ortodôntico Transbond XT Light Cure Adhesive (3M ESPE, Irvine, CA, EUA). Os espécimes foram armazenados em estufa com água destilada a 37ºC por 100 dias. Durante este período, metade dos espécimes de cada grupo foi submetida à termociclagem (-T) (6000 ciclos, 5ºC±1 e 55ºC±1) com banhos alternados de 30 s. Com o auxílio de uma máquina universal para ensaios mecânicos (EMIC - DL 1000, São José dos Pinhais, Paraná, Brasil – F.O. Unesp, São José dos Campos, SP) e um dispositivo tipo faca, os grupos foram submetidos ao ensaio de resistência adesiva ao cisalhamento (1mm/min) até que ocorresse o descolamento dos bráquetes. As superfícies fraturadas foram observadas sob microscopia óptica (30×) para categorização dos tipos de falha e determinação do índice de remanescente adesivo (IRA). Doze amostras representativas (n=2) foram também observadas em microscopia eletrônica de varredura. Os resultados foram submetidos à análise estatística ANOVA (2-fatores) e as médias foram comparadas pelo teste de Tukey com nível de significância em 5% para ambos os testes. Para os resultados de resistência adesiva, o teste ANOVA revelou significância estatística para a interação dos fatores tratamento de superfície e termociclagem (p= 0,013) e para o tratamento de superfície (p= 0,0). O fator termociclagem não influenciou estatisticamente os resultados (p = 0,6974). As maiores e menores médias de resistência adesiva com o desvio padrão foram encontradas respectivamente em G3-T (27,59 ± 6,4 MPa) e G2-T (8,45 ± 6,7 MPa). Na análise da superfície após o ensaio, foi constatada a fratura de esmalte e/ou dentina em dezesseis espécimes. Com exceção do grupo G2, todos os outros apresentaram fratura de estrutura dentária. O modo de falha tipo misto e IRA = 1 (49,12%) foram os mais frequentes. Conclui-se que o tratamento térmico das superfícies silanizadas após o jateamento com partículas de alumina revestidas por sílica produziu valores de resistência adesiva similares aos valores encontrados no grupo controle.
The objective of this study was to evaluate the effect of heat treatment on bond strength of monocrystalline brackets silica coating and silanization process. The study was approved by the ethics committee of the Federal University of Juiz de Fora, autorization number 161/2010. Sixty brackets monocrystalline alumina (Pure®, OrthoTechnology, Tampa, FL, EUA) and sixty premolars recently extracted for orthodontic were randomly, divided in three groups (n=20) according to the strategy of treating surfaces adhesive: G1 – no treatment (control group), G2 – blasting with alumina particles coated with silica 30 µm Cojet (3M ESPE/ Irvine, CA, EUA) + application of silane Monobond S (Ivoclar Vivadent, Shaan, Liechtenstein), and G3 – blasting (Cojet) + silanization + heat treatment with a hairdryer (Taiff Compact Turbo Dryer, 6000W, São Paulo, SP) to 100ºC ± 1, to 1 cm, for 60 s. After surface treatments, the brackets were bonded to teeth with orthodontic adhesive Transbond XT Light Cure Adhesive (3M ESPE, Irvine, CA, EUA). The specimens were stored in distilled water for 100 days. During this period, half of the specimens of each group was subjected to thermocycling (-T) (6000 cycles, 5ºC ± 1ºC and 55ºC ± 1) with baths of 30 seconds. With the support of a universal mechanical testing machine (EMIC – DL 1000, Pinhais, Paraná, Brazil – FO/UNESP, São José dos Campos, SP) an device like a knife, the groups were submitted a shear bond strength test (1mm/min) until failure. The fractured surfaces were observed under debonded specimen surfaces were examined with a stereomicroscope (30×) to classify the types of failure and determine the adhesive remnant index (ARI). Twelve representative samples (n=2) were also observed in scanning electron microscopy. The results were statically analyzed using ANOVA (two-way) and means were compared by Tukey test with significance level of 5% for both tests. For the results of bond strength, the ANOVA revealed statistical significance for the interaction of surface treatment and thermocycling (p= 0,013) and the surface treatment (p= 0,0). The factor thermocycling did not influence the results statistically (p= 0,6974). The highest and lowest mean bond strength including the standard deviation were found in G3T (27,59 ± 6,4 MPa) and G2T (8,45 ± 6,7MPa). In the analysis of the surface after test was found sixteen specimens with enamel/dentin fracture. Except for G2, all others groups had fractured tooth structure. The failure mode mixed and IRA=1 (49,12%) were the most frequent. The heat treatment of the silanized surfaces after blasting with alumina particles coated with silica produced bond strength values similar to those found in the control group.
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Stelle, Flávia Emilena. "ESTUDO DO TRATAMENTO TÉRMICO ASSISTIDO POR PRESSÃO NAS PROPRIEDADES DOS PIGMENTOS DE Al2O3 DOPADO COM ÍONS COBALTO." UNIVERSIDADE ESTADUAL DE PONTA GROSSA, 2017. http://tede2.uepg.br/jspui/handle/prefix/1483.

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In this work a study was accomplished about the synthesis of ceramic pigments based on Al2O3 doped with cobalt ions. This oxide system in the form of powder was heat treated pressure-assisted to investigate the possible structural modifications. Cobalt acetate tetrahydrate and aluminum nitrate nonahydrate were used as salt precursors, followed by calcining at temperatures ranging from 700 ° C to 1100 ° C and subsequent heat treatment pressure-assisted of 2 MPa at 120 ° C for 48 hours. The pigments obtained were characterized by X-ray diffraction (XRD), Rietveld refinements, analysis of specific surface area (BET), field emission scanning electron microscopy (FEG-SEM), Raman spectroscopy, spectroscopy in the UV-visible, X-ray photoelectron spectroscopy (XPS), colorimetry and Photoluminescence spectroscopy. The obtained results through the techniques used in this work were in agreement with each other, contributed to a complete characterization of crystalline structure, surface morphology and optical properties. It was possible to compare the responses of the material when subjected to heat treatment pressure-assisted and when not subjected to this treatment. The formation of -Al2O3, CoAl2O4 e -Al2O3 phases were confirmed by Rietveld and X-ray. The UV-vis spectra presented three bands attributed to the Co+2 in tetrahedral sites. The samples showed maximum PL emission in the region of 2,7 eV. Optical properties of pigments showed a band gap in the range of 1,8 eV attributed to the CoAl2O4.The system was suitable for using the material as an ceramic pigment.
Neste trabalho foi realizado um estudo sobre a síntese de pigmentos cerâmicos à base de Al2O3 dopados com íons cobalto. Esse sistema na forma de pó foi submetido a tratamento térmico assistido por pressão para investigar as possíveis modificações estruturais. Na síntese foram utilizados como precursores os sais de acetato de cobalto tetrahidratado e nitrato de alumínio nonahidratado, seguidos de calcinação em temperaturas que variaram de 700°C a 1100°C e posterior tratamento térmico assistido por pressão de 2MPa a 120°C por 48 horas. Os pigmentos obtidos foram caracterizados por difração de raios X (DRX), refinamento da estrutura por meio do método de Rietveld, análise de área de superfície específica (BET), microscopia eletrônica de varredura por efeito de campo (MEV-FEG), espectroscopia Raman, espectrofotometria na região do UV-visível, espectroscopia de fotoelétrons excitados por raios X (XPS), colorimetria e espectroscopia de fotoluminescência. Os resultados obtidos por intermédio das técnicas utilizadas no presente trabalho tiveram concordância entre si, contribuíram para uma caracterização completa da estrutura, morfologia e propriedades óticas. Foi possível comparar as respostas do material quando submetido ao tratamento térmico assistido por pressão e quando não submetido a esse tratamento. A formação das fases -Al2O3, CoAl2O4 e -Al2O3 foram confirmadas através das análises de Rietveld e raios X. Os espectros de UV-vis apresentaram um tripleto de bandas atribuídos ao Co+2 em uma configuração tetraédrica. As amostras mostraram uma máxima emissão PL na região de 2,7 eV. Propriedades óticas dos pigmentos mostraram um band gap na faixa de 1,8 eV atribuído ao CoAl2O4. O sistema mostrou-se adequado para a utilização como um pigmento cerâmico.
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Fraga, Sara. "EFEITO DA USINAGEM, DO CICLO TÉRMICO DE GLAZEAMENTO E DO CONDICIONAMENTO ÁCIDO NA RESISTÊNCIA FLEXURAL DE UMA CERÂMICA VÍTREA." Universidade Federal de Santa Maria, 2013. http://repositorio.ufsm.br/handle/1/6113.

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Fundação de Amparo a Pesquisa no Estado do Rio Grande do Sul
The aim of this study was to evaluate the effect of hard machining, thermal cycle for glazing and acid etching on the surface roughness and flexural strength of a leucite glass-ceramic. Additionally, it was investigated whether the roughness after machining would be influenced by the machining order and by the pair of burs employed. Six pair of burs were used to produce 144 discs by automated machining, which were divided into groups (n=24): 1) machining (M); 2) machining and heat treatment (MH); 3) machining and acid etching (MA); 4) machining, heat treatment and acid etching (MHA); 5) machining and polishing (MP); 6) machining, polishing and acid etching (MPA). The roughness after each treatment was measured using a contact profilometer. The discs were submitted to a piston-on-three ball flexure test (ISO 6872/2008). Weibull analysis was used to compare the characteristic strength (σ0) and Weibull modulus (m) of the groups. The effect of the treatments, machining order and pair of burs on the surface roughness of the specimens was analyzed. Machining reduced the σ0 when compared to polishing. The polishing protocol was able to eliminate the defects introduced by machining, which was observed by means of scanning electron microscopy. The heat treatment did not alter the roughness, but reduced the σ0 and created amorphous material on the ceramic surface, as shown by the x-ray diffraction. Acid etching increased roughness, without reduce σ0. The Weibull modulus did not differ significantly among the groups, which means that all the treatments resulted in similar defects distribution. Spearman s coefficient (rs) indicated strong and significant correlation between machining order and roughness (rsRa = -0,66; rsRz = -0,73). The roughness after machining differed significantly according to the pair of burs employed (p<0,05). Thus, hard machining and thermal cycle for glaze demonstrated a negative effect on the ceramic strength, as opposed to acid etching, which does not appear to affect the flexural strength of the material. Variability in the roughness data could be expected after machining, since the Ra and Rz values seem to be influenced by the machining order and the pair of burs employed.
O presente trabalho objetivou avaliar o efeito da usinagem de corte duro, do ciclo térmico de glazeamento e do condicionamento ácido na rugosidade superficial e na resistência flexural de uma cerâmica vítrea reforçada por leucita. Adicionalmente, buscou-se investigar se a rugosidade após usinagem seria influenciada pela ordem de usinagem e pelo par de brocas utilizado. Seis pares de brocas foram empregados na confecção de 144 discos por usinagem automatizada, os quais foram divididos nos grupos (n=24): 1) usinagem (U); 2) usinagem e tratamento térmico (UT); 3) usinagem e condicionamento ácido (UCA); 4) usinagem, tratamento térmico e condicionamento ácido (UTCA); 5) usinagem e polimento (UP); 6) usinagem, polimento e condicionamento ácido (UPCA). A rugosidade (Ra e Rz) após os tratamentos foi mensurada em perfilômetro de contato. Os discos foram submetidos ao ensaio de flexão biaxial piston-on-three ball (ISO 6872/2008). Análise de Weibull foi utilizada para comparar-se os grupos quanto à resistência característica (σ0) e ao módulo de Weibull (m). Os efeitos dos tratamentos, da ordem de usinagem e dos diferentes pares de brocas sobre a rugosidade superficial dos corpos de prova foi estudado. A usinagem reduziu a σ0, quando comparada ao grupo UP. O protocolo de polimento adotado foi capaz de eliminar os defeitos oriundos da usinagem, o que foi verificado por meio de imagens em microscopia eletrônica de varredura. O tratamento térmico não alterou a rugosidade, mas reduziu a σ0 e ocasionou a formação de material amorfo na superfície da cerâmica, como mostrado pela difração de raios-x. O condicionamento ácido aumentou a rugosidade, sem alterar a σ0. O valor de m não diferiu significativamente entre os grupos, o que significa dizer que os tratamentos aplicados na cerâmica resultaram em distribuição similar de defeitos. Coeficiente de Spearman (rs) indicou correlação forte e significativa entre ordem de usinagem e rugosidade (rsRa = -0,66; rsRz = -0,73), a qual diferiu significativamente conforme o par de broca empregado para a usinagem (p<0,05). Sendo assim, a usinagem de corte duro e o ciclo térmico usado no glazeamento demostraram efeito negativo na resistência da cerâmica, em oposição ao condicionamento ácido, o qual parece não afetar a resistência do material. Variabilidade dos dados de rugosidade pode ser esperada após usinagem, uma vez que os valores de Ra e Rz parecem ser influenciados pela ordem de usinagem e pelo par de brocas utilizado.
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Huang, Jue-Lang, and 黃俊榮. "The Tribological Behaviour of Cr-Mo Steel after Surface Heat Treatment,Ceramic and Solid Lubrications Coating." Thesis, 1993. http://ndltd.ncl.edu.tw/handle/55644389751835120853.

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Chuang, Shun-Chieh, and 莊舜傑. "Sintering Behavior and Electrical Properties of Diopside Glass-ceramic under Two-stage Heat Treatment and CaTiO3 Addition." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/58019097172009865500.

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Abstract:
碩士
國立臺灣科技大學
機械工程系
100
The CaMgSi2O6 glass-ceramic with low dielectric constant was investigated using low temperature co-fired ceramic capacitors (LTCC). The CaCO3-Mg(OH)2-2SiO2 and ZrO2, nucleating agent, were mixed, and the resulting powders were melted at 1500℃, furnace cooling and ball milling. Glass frits heat treated at different temperatures from 800℃to 848℃ for 5 mins forms, and the pellets fabrication sintered at 960℃ for 2 hours were studied. The nucleation, Phase evolution, microstructures and dielectric properties of CaMgSiO6 glass-ceramics were analyzed by using DTA, XRD spectroscopy, scanning electron microscopy and electrical property measurements. The DTA result shows that the first exothermic peak appears at the 830℃. Comparing the XRD pattern of the glass frits heat-treating from 832℃ to 848 ℃, the XRD reveal the ZrO2 peak in it, indicating that the ZrO2 nucleating agent firstly nucleate in the glass frits. However, the ZrO2 peak never appears in the XRD pattern due to the non-nucleation. Then, the densities and dielectric properties of the pellets using glass frits heat treated at 800 ℃ to 824 ℃ show the low densities (2.1~2.4 g/cm3), low dielectric constants (4.89~5.75) and low quality factors(1654~1754 GHz) due to the high pores in the pellets. In addition, the pellets using glass frits heat treating at 832 ℃ to 848 ℃ show that the high densities (>3 g/cm3), high dielectric constants (~7.2) and high quality factors (8570~10440 GHz), indicating that the ZrO2, nucleating agents, can be obtained in the glass frits with second heat treatment of 832℃ to 848 ℃. Furthermore, we try to modify the temperature coefficient of resonant by using glass frits heat treated at 848℃ for 5 mins with CaTiO3 powder of 2.5 mole%, 5 mole%、7.5 mole%、10 mole%、12.5 mole% and 15mol% additions. The XRD patterns show the increase amount of CaTiO3 peak. The dielectric properties show that the enhanced dielectric constant and improved τf can be attributed to the high dielectric constant and positive τf of CaTiO3 phase. However, the CaTiO3 powders added in the MgCaSi2O6 glass-ceramic show the decrease of quality factors due the low quality factors of CaTiO3 phase.
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Lee, Hsin, and 李新. "Materialization Study on Glass-Ceramic from TFT-LCD Wasted Glass Mixing with Basic Oxygen Furnace Slag by TwoStage Heat Treatment." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/25937674496671343850.

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Abstract:
碩士
國立臺灣大學
環境工程學研究所
99
Abstract The influence of two-stage heat treatment and additives like MgO、Al2O3 on the dielectric properties and mechanical properties of glass-ceramics made from a combination of TFT-LCD(Thin Film Transistor Liquid Crystal Display) waste glass and Basic Oxygen Furnace Slag(BOF) is investigated. The system of glass-ceramic shifted from CAS to MAS system was through 20%(w/w) MgO and 20%(w/w) Al2O3 added into the martrix(TFT-LCD waste glass: BOF=7:3). The experiment demonstrated that the density increased with temperature increase. Moreover, both adding additives and two-stage heat treatment improved mechanical properties due to production of forsterite crystal. Under two-stage heat treatment process with 640℃ for 2 hours followed by 980℃ for 30minutes, a material with high density (2.91 g/cm3),high bending strength (256MPa), high compressive strength(717MPa) ,low dielectric dielectric constant(7.59) and low dielectric loss factor(0.097) were resulted, which met the required standard of insulated glass-ceramic.
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Fokas-Tsentzeratos, Georgios [Verfasser]. "Influence of the surface and heat treatment on the flexural strength and reliability of Y-TZP dental ceramic / vorgelegt von Georgios Fokas-Tsentzeratos." 2010. http://d-nb.info/1005346828/34.

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Books on the topic "Sialon ceramic heat treatment"

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United States. National Aeronautics and Space Administration. and U.S. Army Research Laboratory., eds. Heat treatment effects on the tensile properties and microstructures of a SiC/RBSN composite in nitrogen. [Washington, D.C.]: National Aeronautics and Space Administration, 1995.

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Anita, Garg, United States. National Aeronautics and Space Administration., and U.S. Army Research Laboratory., eds. Thermal stability of Hi-Nicalon SiC fiber in nitrogen and silicon environments. [Washington, D.C.]: National Aeronautics and Space Administration, 1995.

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Anita, Garg, United States. National Aeronautics and Space Administration., and U.S. Army Research Laboratory., eds. Thermal stability of Hi-Nicalon SiC fiber in nitrogen and silicon environments. [Washington, D.C.]: National Aeronautics and Space Administration, 1995.

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Anita, Garg, United States. National Aeronautics and Space Administration., and U.S. Army Research Laboratory., eds. Thermal stability of Hi-Nicalon SiC fiber in nitrogen and silicon environments. [Washington, D.C.]: National Aeronautics and Space Administration, 1995.

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Book chapters on the topic "Sialon ceramic heat treatment"

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Kurama, S. "Optimization of α-SiAlON Microstructure by Heat Treatment." In High-Performance Ceramics V, 891–93. Stafa: Trans Tech Publications Ltd., 2008. http://dx.doi.org/10.4028/0-87849-473-1.891.

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Lee, Hyeon Keun, and Do Kyung Kim. "Effect of Second Phase After-Heat Treatment on the Thermal Conductivity of AlN Ceramics." In SiAlONs and Non-oxides, 61–63. Stafa: Trans Tech Publications Ltd., 2008. http://dx.doi.org/10.4028/3-908454-00-x.61.

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Oertel, C. G., I. Hünsche, W. Skrotzki, A. Lorich, and W. Knabl. "Texture Development of Molybdenum Sheets during Last Step of Heat Treatment." In Ceramic Transactions Series, 791–800. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2008. http://dx.doi.org/10.1002/9780470444191.ch89.

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Haldar, A., D. Das, and P. P. Chattopadhyay. "Texture and Microstructure Development in Copper After Cryogenic Rolling and Heat Treatment." In Ceramic Transactions Series, 83–94. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2008. http://dx.doi.org/10.1002/9780470444214.ch9.

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Suzuki, Yoshikazu, Singto Sakulkhaemaruethai, Ryuhei Yoshida, and Susumu Yoshikawa. "Heat Treatment Effect on the Structure of TiO2 -Derived Nanotubes Prepared by Hydrothermal Method." In Ceramic Transactions Series, 185–92. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118407158.ch20.

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Kilani, Mouna, Cathy Gguasch, Michel Castagné, and Najoua Kamoun-Turki. "Effect of Heat Treatment on the Physical Properties of In2 S3 Prepared by Chemical Bath Deposition." In Ceramic Transactions Series, 255–60. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118585160.ch23.

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Oda, Hiroshi, and Toshihiro Ishikawa. "Effects of the Microstructure, and Degradation Reaction Under Heat-Treatment on Mechanical Properties of Sic-Polycrystalline Fiber." In Ceramic Transactions Series, 55–64. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2017. http://dx.doi.org/10.1002/9781119407270.ch6.

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Demir, Adem, and Derek P. Thompson. "Effect of Fibre Heat-Treatment on Nicalon SiC Fibre Reinforced β-SiAlON Matrix Composites." In Materials Science Forum, 141–46. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-439-1.141.

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Caruso, Keith S., David G. Drewry, Don E. King, and Justin S. Jones. "Heat Treatment of Plasma-Sprayed Alumina: Evolution of Microstructure and Optical Properties." In Advanced Ceramic Coatings and Interfaces II, 175–92. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2009. http://dx.doi.org/10.1002/9780470339510.ch18.

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Vukovich, M., G. S. Sheffield, G. L. Snider, and K. Mahon. "An Accurate Easy-to-Use Heat-Treatment Controller." In Materials & Equipment/Whitewares: Ceramic Engineering and Science Proceedings, Volume 7, Issue 11/12, 1274–78. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2008. http://dx.doi.org/10.1002/9780470320365.ch12.

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Conference papers on the topic "Sialon ceramic heat treatment"

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Baik, K. H., P. S. Grant, A. R. Bhatti, and R. A. Shatwell. "Fabrication of SiC Fibre Reinforced MoSi2 Based Composites by Low Pressure Plasm a Spraying." In ITSC 2000, edited by Christopher C. Berndt. ASM International, 2000. http://dx.doi.org/10.31399/asm.cp.itsc2000p0821.

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Abstract SiC fibre reinforced SiAlON-MoSi2 composites have been manufactured by concurrent fibre winding and low pressure plasma spraying (LPPS), producing multi-layer, circumferentially fibre-reinforced composite rings. LPPS parameters for the powder used were optimised by a two-level experimental design method followed by additional tuning, achieving smooth sprayed surfaces with low matrix porosity and good deposition efficiency. The microstructure of the SiAlON-MoSi2 matrix consisted of a lamellar structure and uniformly distributed SiAlON splats throughout the MoSi2 matrix. The spray/wind composites exhibited 2% porosity and well controlled fibre distribution. Matrix cracking occurred after heat treatment at 1500°C and was attributed to the development of large tensile residual stresses during cooling due to CTE mismatch. Increasing the SiAlON to MoSi2 ratio in the composite solved the problem. Simulations based on residual stresses showed that the maximum permissible fibre volume fraction to avoid matrix cracking was 0.06 for SiC/MoSi2 and 0.23 for SiC/SiAlON(40v/o)-MoSi2.
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Chang, Cho-Liang, Jui-Wen Liang, Wei Chen, and Sheng-Li Fu. "Preparation of fluorescent ceramic nanofibers by electrospinning and heat treatment." In 2016 International Conference on Electronics Packaging (ICEP). IEEE, 2016. http://dx.doi.org/10.1109/icep.2016.7486918.

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Liang, Jui-Wen, Wen-Yu Wang, and Cho-Liang Chung. "Preparation of fluorescent ceramic nanofibers by electrospinning and heat treatment." In 2017 International Conference on Electronics Packaging (ICEP). IEEE, 2017. http://dx.doi.org/10.23919/icep.2017.7939451.

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Tanabe, Hirotaka, Tohru Takamatsu, and Tetsuro Hamada. "Effects of heat treatment on mechanical properties of ceramic thin films." In Fourth International Conference on Experimental Mechanics, edited by Chenggen Quan, Kemao Qian, Anand K. Asundi, and Fook S. Chau. SPIE, 2009. http://dx.doi.org/10.1117/12.851009.

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Tan, Jichun, Zhe Chen, Yong Su, Chunxiang Feng, Dong Cao, and Dianchun Liu. "Preparation of a silicon carbide ceramic fiber by CO 2 laser heat treatment." In Photonics China '96, edited by Shu-Sen Deng and S. C. Wang. SPIE, 1996. http://dx.doi.org/10.1117/12.253121.

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Picouet, Pierre A., Daniel McStay, Catherine Hunter, and Kenneth Tonge. "Ceramic coating of metal by laser heat treatment at ambient pressure and temperature." In Advanced High-Power Lasers and Applications, edited by Claude R. Phipps and Masayuki Niino. SPIE, 2000. http://dx.doi.org/10.1117/12.376957.

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Xiong, Z. X., J. Pan, H. Xue, M. F. Mai, H. Qiu, and L. F. Chen. "Heat treatment of piezoelectric Pb(ZrTi)O 3 ceramic fibers prepared with continuous spinning." In Second International Conference on Smart Materials and Nanotechnology in Engineering, edited by Jinsong Leng, Anand K. Asundi, and Wolfgang Ecke. SPIE, 2009. http://dx.doi.org/10.1117/12.843577.

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Zhang, Q., and M. A. Jog. "Kinetic Theory Treatment for Heat Transfer in Plasma Spraying." In ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-33079.

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In plasma spraying process thermal plasma is used as a heat source to heat and melt metallic or ceramic particles. In this paper, heat transfer from a thermal plasma to a solid spherical particle has been analyzed using a kinetic theory approach. We have considered a solid particle introduced in an ionized gas made up of electrons, ions, and neutrals. Two-sided electron velocity and temperature distributions and two-sided ion velocity distributions are used. Maxwell’s transport equations are obtained by taking moments of the Boltzmann equation. The transport equations are solved with the Poisson’s equation for the self-consistent electric field. The ion and the electron number density distributions, temperature distribution, and the electric potential variation are obtained. The charged species flux to the particle surface is evaluated. Heat transport to the surface is calculated by accounting for all the modes of energy transfer including the energy deposited during electron and ion recombination at the surface. Results indicate that contribution to heat transfer from charged species recombination is substantial at high plasma temperatures.
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Kumpulainen, E., M. Vippola, P. Vuoristo, P. Sorsa, and T. Mäntylä. "Characteristics of Phosphoric Acid Sealed Ceramic Oxide Coatings." In ITSC 1996, edited by C. C. Berndt. ASM International, 1996. http://dx.doi.org/10.31399/asm.cp.itsc1996p0489.

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Abstract Plasma sprayed ceramic coatings usually have relatively high open porosity in order to provide a good corrosion protection. By using sealants the porosity values can be reduced. In this study atmospheric plasma sprayed (APS) aluminium oxide, chromium oxide and zirconium oxide coatings were sealed by a phosphoric acid treatment. After impregnation the coatings were heat treated at a curing temperature of 400°C. Phosphoric acid was found to react with the coating material during the heat treatment. Wear resistance was evaluated by rubber wheel abrasion tests and corrosion resistance by electrochemical potentio-dynamic polarization tests. Hardness values were also measured. Corrosion resistance and hardness values of sealed coatings were remarkable better in comparison to the unsealed coatings. Rubber wheel abrasion resistances of the sealed coatings were equal to those of Al2O3, ZTA, SiC and Si3N4 sintered ceramics.
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Fomina, Marina A., Aleksey Voyko, Ivan Egorov, Andrey Shchelkunov, Andrey Zakharevich, Aleksandr Skaptsov, and Aleksandr Shumilin. "Analysis of (Ti, Zr, Ta)-(O, C, N) systems for obtaining metal-ceramic coatings of the required composition by induction heat treatment." In Saratov Fall Meeting 2018: Optical and Nano-Technologies for Biology and Medicine, edited by Valery V. Tuchin and Elina A. Genina. SPIE, 2019. http://dx.doi.org/10.1117/12.2523780.

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Reports on the topic "Sialon ceramic heat treatment"

1

Ebert, W. E., N. L. Dietz, and D. E. Janney. Effects of heat treatment and formulation on the phase composition and chemical durability of the EBR-ll ceramic waste form. Office of Scientific and Technical Information (OSTI), January 2006. http://dx.doi.org/10.2172/881576.

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