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首页> 外文会议>Symposium on Structure and Mechanical Properties of Nanophase Materials- Theory and Computer Simulation vs. Experiment Nov 28-30, 2000, Boston, Massachusetts, U.S.A. >Processing and Properties of Ceramic Nanocomposites Produced from Polymer Precursor Pyrolysis, High Pressure Sintering and Spark Plasma Sintering
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Processing and Properties of Ceramic Nanocomposites Produced from Polymer Precursor Pyrolysis, High Pressure Sintering and Spark Plasma Sintering

机译：聚合物前驱体热解，高压烧结和放电等离子烧结制备的陶瓷纳米复合材料的制备及性能

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摘要

Silicon nitride/silicon carbide nanocomposites and alumina-based nanocomposites were investigated in an effort to produce materials with high structural integrity and service properties. Bulk nano-nano composites of silicon nitride and silicon carbide were processed by crystallization of amorphous Si-C-N ceramics that were consolidated in-situ during pyrolysis of a polymer precursor. This material was developed for the purpose of examining the creep behavior of covalent ceramics when there is no oxide glassy phase at grain boundaries. Si_3N_4/SiC micro-nano composites were sintered by spark plasma sintering (SPS), aiming at better microstructural control and improved creep resistance. Composites of alumina with diamond, silicon carbide and metal (Nb) were developed by high pressure sintering and SPS. These composites maintain microstructures with a nanometric alumina matrix and are targeted for studying the toughening mechanisms and superplastic deformation mechanisms.
机译：研究了氮化硅/碳化硅纳米复合材料和氧化铝基纳米复合材料，以生产具有高结构完整性和使用性能的材料。氮化硅和碳化硅的块状纳米纳米复合材料是通过非晶态Si-C-N陶瓷的结晶加工而成的，该陶瓷在聚合物前体热解过程中就地固结。开发该材料的目的是，当在晶界处没有氧化物玻璃相时，检查共价陶瓷的蠕变行为。 Si_3N_4 / SiC微纳米复合材料通过火花等离子体烧结（SPS）进行烧结，目的是更好地控制微观结构并提高抗蠕变性。通过高压烧结和SPS技术开发了氧化铝与金刚石，碳化硅和金属（Nb）的复合材料。这些复合材料保持了具有纳米氧化铝基体的微结构，并且旨在研究增韧机理和超塑性变形机理。

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