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采用两组复合烧结助剂Y2O3-CaF2,Y2O3-CaF2-Li2CO3在1600℃烧结AlN陶瓷,对AlN陶瓷烧结密度,热性能和电性能进行了测试,并分析了AlN陶瓷物相变化和微观结构。结果表明,复合烧结助剂在低温下能明显促进AlN陶瓷致密化及晶粒生长发育,尤其是添加3wt%Y2O3-2wt%CaF2作烧结助剂,1600℃常压烧结4h制备了结晶良好,相对密度为98.4%,热导率为133.62W/m.K,同时具有较低相对介电常数的AlN陶瓷。在低温常压条件下制备出性能较高的AlN陶瓷。 相似文献
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冲击波对AlN粉体性能及低温烧结特性的影响 总被引:1,自引:0,他引:1
研究了冲击波对AlN粉体性能的影响,并探索了以冲击波处理的AlN粉体为原料,添加5%助烧结剂的低温结过程。结果表明,冲击波处理AlN粉将使晶粒产生大量的晶格略变,从而活化了粉体。以冲击波处理的AlN粉为原料,在1610℃下进行无压烧结,可得到密为3.33g/cm^3的AlN陶瓷。 相似文献
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用三组烧结助剂[多壁碳纳米管(multi-wall carbonnanotube,MWNT)、Y2O3-CaF2及MWNT-Y2O3-CaF2]在1600℃低温烧结AlN陶瓷,测试AlN陶瓷烧结密度、热性能和电性能,分析其物相变化和微观结构。结果表明:外添加剂在低温能明显促进AlN陶瓷致密化及晶粒生长发育,并且用合适的埋粉和保护气氛可以防止AlN陶瓷在烧结过程中发生氧化,其中添加质量分数(下同)1%MWNT-3%Y2O3-2%CaF2作烧结助剂,于1600℃保温4h可以制备相对体积密度为97.2%,热导率为138.57W/(m·K),同时具有较低相对相对介电常数的AlN陶瓷,即在低温无压条件下制备性能较高的AlN陶瓷。 相似文献
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本文评述了低温烧结助剂对氧化铝陶瓷烧结效果的影响及烧结助剂在氧化铝陶瓷低温烧结过程中的作用机理,并介绍了几种常用的复相烧结助剂体系及体系中各组分起到的作用,最后指出了目前采用的烧结助剂在进行低温烧结氧化铝陶瓷时存在的不足及需要解决的问题. 相似文献
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F. Ya. Kharitonov S. S. Vishnevskaya G. I. Barashenkov Yu. V. Salyuk 《Refractories and Industrial Ceramics》1986,27(1-2):16-19
Conclusions We obtained a vacuum-tight MKh-1 type corundum material (96% Al2O3) having a low (up to 1460°C) sintering temperature. The material possesses high levels of electrophysical and physicotechnological properties, meets the specifications [GOST 20419-83 (ST SÉV 3567-82), group 786.1], and it can be used for producing the insulators of the metal-ceramic assemblies.Translated from Ogneupory, No. 1, pp. 15–18, January, 1986. 相似文献
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The use of glasses with eutectic compositions in the system CaO-P2O5 as a sintering aid and as a source of a resorbable phase for obtaining a composite biomaterial for bone implants is examined.
The use of such glass has made it possible not only to lower the sintering temperature by realization of the mechanism of
liquid-phase sintering but also to form a ceramic material possessing bioresorbability. The material obtained consists of
calcium hydroxyapatite, vitlokite, and calcium pyrophosphate phases.
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Translated from Steklo i Keramika, No. 7, pp. 19–24, July, 2007. 相似文献
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Glass-ceramics based on iron rich wastes were produced by direct sintering and by following an innovative approach, combining direct sintering and sinter-crystallisation processes. According to the second method, a layered tile was manufactured by single firing at 900°C using a selected combination of wastes for both the porous body and the dense coating layer. The coating layer (‘glaze’) results from the sinter-crystallisation of a waste derived glass mixed with zircon and recycled borosilicate glass. The glaze sealed the porosity of the body and enhanced both mechanical properties and chemical stability. The results show a near to zero water absorption rate, despite a low geometric density (~2?g?cm??3), accompanied by a Young's modulus of ~40?GPa and a bending strength of ~30?MPa. The chemical stability of the glass-ceramics thus developed was assessed by the application of a toxicity control leaching procedure. Furthermore, cell culture tests were carried out to evaluate the potential cytotoxicity of the materials. 相似文献
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以电解锰渣和废玻璃为主要原料,采用低温烧结法制备陶瓷砖,探讨了烧结温度、电解锰渣及废玻璃的含量对陶瓷砖基本性能的影响。结果表明,随着烧结温度的升高,陶瓷砖吸水率先减小后增大,体积密度先增大后减小;随着锰渣含量的增加,陶瓷砖的吸水率逐渐增大,体积密度逐渐减小;随着玻璃含量的增加,陶瓷砖的吸水率逐渐减小,体积密度逐渐增大。40 g陶 瓷原料,当锰渣的添加量为32%(质量分数)、玻璃的添加量为10 g、烧结温度为900 ℃时,得到的陶瓷砖的吸水率最低、体积密度最大。 相似文献
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To obtain light, strong materials with high thermal conductivity, a new carbon-based material, AlN ceramic bonded carbon (AlN/CBC), was fabricated by combining gelcasting and spark plasma sintering techniques. The results showed that AlN/CBC (20 vol% AlN) has a unique microstructure containing carbon grains of 15 μm in size and an AlN grain-boundary layer of 0.5-3 μm in thickness. Continuous AlN ceramic networks bonded the carbon grains together. Compared with the conventional AlN/carbon (AlN/C) material made by a ball-milling method, AlN/CBC showed a higher strength and a higher thermal conductivity by two and four times, respectively. 相似文献
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Translated from Steklo i Keramika, No. 8, pp. 21–22, August, 1992. 相似文献
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《Journal of the European Ceramic Society》2002,22(2):183-189
We have developed a novel combination of electrophoretic deposition (EPD), reaction bonding and low temperature sintering techniques for the fabrication of yttria stablised zirconia (YSZ)/alumina composite coatings on Fecralloys. A mixture of ethanol and acetylacetone solvent was found to be an effective medium for YSZ and aluminium particle suspension. With the particle size of YSZ and aluminium being significantly reduced during ball milling. By using the EPD process, uniform green form coatings containing YSZ and aluminium particles were produced on Fecralloys. After oxidation of aluminium at 500°C and sintering at 1200°C, a dense and adherent YSZ/Al2O3 coating was produced. The presence of aluminium in the green form coatings not only contribute to the bonding between the coating and the metal substrate, but also compensate for the volume shrinkage of the coatings during sintering by the volume expansion arising from oxidation of aluminium to alumina. 相似文献