共查询到16条相似文献,搜索用时 968 毫秒
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层状结构的Ti3SiC2属六方晶体结构,结合了金属和陶瓷的许多优异性能,如良好的导热和导电性能,优良的可加工性,耐氧化、耐化学腐蚀,优异的抗热震性,良好的自润滑性等,具有广阔的应用前景.本文介绍了Ti3SiC2的结构和性能,对其制备方法及应用进行了阐述. 相似文献
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利用热等静压原位合成技术制备了Ti3SiC2/SiC复相陶瓷,对其高温氧化行为进行了研究.结果表明,Ti3SiC2/SiC复相陶瓷在空气中静态氧化时的氧化增重符合抛物线规律,有比纯Ti3SiC2更好的抗氧化性能,并且在1400℃的长时抗氧化性能优于1200℃. 相似文献
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三元层状结构陶瓷材料主要是指Mn+1AXn相,三元层状结构MAX相陶瓷材料具有金属的特性还具有陶瓷的特性,三元层状结构MAX相陶瓷材料具有较高的力学性能,良好的耐磨损性能和良好的耐腐蚀性能,并具有良好的抗高温氧化性能等,还具有良好的可加工性能。三元层状结构MAX相陶瓷材料主要有Ti3SiC2,Ti4SiC3,Ti3AlC2,Ti2AlC,Ti4AlN3和Ti2AlN等。本文主要叙述三元层状结构MAX相陶瓷材料的制备技术,物相组成,显微结构,力学性能和耐磨损性能,耐腐蚀性能和抗高温氧化性能以及其他性能等。并叙述三元层状结构MAX相陶瓷材料的研究发展现状和发展趋势。并对三元层状结构MAX相陶瓷材料的未来研究发展趋势和发展方向进行分析和预测。 相似文献
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Nagarajan Kirupakaran Gopinath Gopalan Jagadeesh Bikramjit Basu 《Journal of the American Ceramic Society》2019,102(11):6925-6938
We investigate the thermochemical stability of ZrB2–SiC based multiphase ceramics to hypersonic aerothermodynamic conditions in free piston shock tube with an objective to understand quantitatively the role of thermal shock and pressure. The developed ceramics sustained impulsive thermomechanical shock, under reflected shock pressure of 6.5 MPa and reflected shock temperature of 4160 K in dissociated oxygen, without structural failure. The conjugate heat transfer analysis predicts the surface temperature of ZrB2–SiC to reach a maximum of 693 and 865 K, for ZrB2–SiC–Ti. The transient shock-material response is characterized by surface oxidation of the investigated ceramics, when exposed to high enthalpy gaseous environment, as a consequence of the interaction with ultrafast-heated (106 K/s) gas for ~5 ms. Spectroscopic and structural characterization reveals that addition of Ti improves thermomechanical shock resistance, which is attributed to the assemblage of refractory phases. Taken together, ZrB2–SiC–Ti based multiphase ceramics exhibit favorable shock-material response under impulse loading. 相似文献
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To obtain composite ceramics with excellent thermal shock resistance and satisfactory high?temperature service performance for solar thermal transmission pipelines, SiC additive was incorporated into Al2O3?mullite?ZrO2 composite ceramics through a pressureless sintering process. The effect of the SiC additive on thermal shock resistance was studied. Also, the variations in the microstructure and physical properties during thermal cycles at 1300 °C were discussed. The results showed that both thermal shock resistance and thermal cycling performance could be improved by adding 20 wt% SiC. In particular, the sample with 50 wt% Al2O3, 35 wt% Coal Series Kaolin (CSK), 15 wt% partially yttria?stabilized zirconia (PSZ), and 20 wt% SiC additional (denoted as sample A2) exhibited the best overall performance after firing at 1600 °C. Furthermore, the bending strength of sample A2 increased to 124.58 MPa, with an increasing rate of 13.63% after 30 thermal shock cycles. The increase in thermal conductivity and the formation of mullite were the factors behind the enhancement of thermal shock resistance. During the thermal cycles, the oxidation of SiC particles was favorable as it increased the microstructure densification and also facilitated the generation of mullite, which endowed the composite ceramics with a self?reinforcing performance. 相似文献