改善二硅化钼反应烧结陶瓷材料化学性能和物理力学性能的工艺特点研究

V. Kovbashyn, I. Bochar
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摘要

介绍了提高二硅化钼反应烧结陶瓷材料化学性能和物理力学性能的建议方法。为了显著提高陶瓷产品的操作温度,向更严格的操作条件转变,有必要改进现有的陶瓷加工方法,并显著改变新方法的开发。对陶瓷材料加工的各种方法进行了研究和分析,其中包括引入活化添加剂,用分散的颗粒、丝状晶体和纤维硬化以及应用保护涂层以防止表层的快速氧化。从各种杂质中对初始起始组分进行部分纯化,可以显著提高钼陶瓷二硅化物的某些特性。钼陶瓷的二硅化剂对钼陶瓷二硅化剂的物理力学性能(导热系数、电阻、热膨胀系数和强度)有显著的影响。钼陶瓷二硅化剂在初始组分和工艺生产过程中都被引入基材中。已经确定,可以通过在装料中引入铝、硼、铍、铁、钇、镍和钴粉末,加强钛涂层,其中包括硅化和钛技术,来提高操作温度,并确保在更恶劣的工作条件下使用二硅化钼基陶瓷材料。研究表明,在高温和熔融硅存在下,在表层晶粒上发生二硅化钼的合成和结晶,在一定深度上发生亚微米级二硅化钼的溶解和再结晶。在对已发表的数据分析和实际研究的基础上,提出了提高二硅化钼反应烧结陶瓷材料化学性能和物理力学性能的综合措施。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The study of technological peculiarities for improvement of chemical and physico-mechanical properties of reaction-sintered ceramic materials based on molybdenum disilicide
Recommended ways to improve the chemical and physico-mechanical properties of reaction-sintered ceramic materials based on molybdenum disilicide have been described. In order to significantly increase the operating temperatures and change to more stringent operating conditions for ceramic products, it is necessary to improve existing methods of processing ceramics and significantly change the development of new ones. Various means for processing of ceramic materials have been studied and analyzed, which include the introduction of activating additives, hardening with dispersed particles, filamentary crystals and fibers and application of a protective coating to prevent rapid oxidation at surface layers. Carrying out partial purification of the initial starting components from various impurities can significantly increase some characteristics of the disilicide of molybdenum ceramics. Disilicide of molybdenum ceramics has been researched to have significant influence on the physical and mechanical properties (thermal conductivity, electrical resistance, coefficient of thermal expansion and strength) of molybdenum ceramics disilicides, which are introduced into the base material both with the initial components and in the process of its technological production. It has been established that it is possible to increase operating temperatures and ensure the use of molybdenum disilicide-based ceramic materials in harsher working conditions can be achieved by introducing of aluminum, boron, beryllium, iron, yttrium, nickel and cobalt powders into the charge, strengthening titanium coating, which includes silicification and titanium technology. It has been researched that at high temperatures and in the presence of molten silicon the synthesis and crystallization of molybdenum dicilicide occur on the grains in the surface layers, as well as dissolution and recrystallization of submicron particles of molybdenum dicilicide take place at certain depth. Based on the published data analysis and conducted research, the complex of measures for improving the chemical and physico-mechanical properties of reaction-sintered ceramic materials based on molybdenum disilicide has been proposed.
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