Fundamental Studies of High Pressure Self-Sustaining Synthesis of Silicon Nitride Based Ceramics

高压自持合成氮化硅基陶瓷的基础研究

• 批准号: 9700503
• 负责人: Jan Puszynski
• 金额: --
• 依托单位: South Dakota School of Mines and Technology
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-08-01 至 2001-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9700503&HistoricalAwards=false
• 关键词: Fundamental; Studies; Pressure; Self; Sustaining

Abstract - Puszynski This is a study of the fundamentals of high-pressure synthesis of silicon- nitride-based ceramics in a self-sustaining regime. Aspects investigated include particle-particle-gas interactions, product morphology, and phase composition of combustion-synthesized ceramics. The effort focuses on the effects of combustion conditions and various additives, factors that may alter crystal growth and the formation mechanisms of silicon-nitride-based ceramics. Quantitative data are obtained on the formation and crystal growth of silicon nitride, silicon oxynitride, sialon, and silicon carbide during self- sustaining, high-pressure nitridation of silicon powders containing amounts of oxides, nitrides, halogens, and/or carbon. Models are developed to describe the complex reaction and diffusion processes on a particle level during formation of single-phase silicon nitride and other solid solutions. Widespread application of advanced nitride ceramics is limited by high synthesis and processing costs. Combustion synthesis is an attractive method for overcoming this obstacle. Silicon-nitride-based ceramics are attractive for many high-technology applications because of their chemical inertness, high- temperature stability, fracture toughness and resistance to erosion, corrosion, and thermal shock.

摘要 - Puszynski 这是一项在自持状态下高压合成氮化硅基陶瓷的基础研究。 研究的方面包括颗粒-颗粒-气体相互作用、产物形态和燃烧合成陶瓷的相组成。 这项工作的重点是燃烧条件和各种添加剂的影响，以及可能改变晶体生长和氮化硅基陶瓷形成机制的因素。 获得关于在含有大量氧化物、氮化物、卤素和/或碳的硅粉末的自持高压氮化过程中氮化硅、氧氮化硅、赛隆和碳化硅的形成和晶体生长的定量数据。 开发模型来描述单相氮化硅和其他固溶体形成过程中颗粒水平上的复杂反应和扩散过程。 先进氮化物陶瓷的广泛应用受到高合成和加工成本的限制。 燃烧合成是克服这一障碍的一种有吸引力的方法。 氮化硅基陶瓷因其化学惰性、高温稳定性、断裂韧性以及耐侵蚀、耐腐蚀和耐热冲击性而对许多高科技应用具有吸引力。