Focusing on the research and application of high-performance silicon carbide ceramics

Silicon carbide ceramics: structural ceramics with great development prospects

As one of modern engineering ceramics, silicon carbide ceramics have a hardness second only to diamond. It has outstanding physical and chemical properties, such as small coefficient of thermal expansion, high thermal conductivity, good chemical stability, high wear resistance, good mechanical properties and oxidation resistance at high temperatures. It has become a highly promising structural ceramic.

Application of Silicon Carbide Ceramics

It can be widely used in petrochemical industry, metallurgical machinery, microelectronic devices, aerospace and other fields. At the same time, SiC also has the advantages of low neutron activity, good radiation damage resistance, high temperature structural stability and so on, making it one of the important structural materials in the new generation of nuclear fission and future nuclear fusion reactors.

Sintering Method of SiC Ceramic Materials

SiC ceramics are composed of strong covalent bond, which not only makes SiC have high thermal conductivity, good thermal stability and excellent mechanical properties, but also is difficult to prepare. In order to ensure the high thermal conductivity of SiC ceramics, high-purity and high-density SiC ceramics are essential. The existence of strong covalent bond in SiC ceramics makes it extremely difficult to densify, thus requiring a higher sintering temperature, making the process complex and high cost, which greatly limits its industrial application.

There are many sintering methods for SiC ceramic materials, including pressing sintering, hot pressing sintering, reaction sintering, recrystallization sintering, microwave sintering, and discharge plasma sintering. Hot pressing sintering and reaction sintering are the three most commonly used sintering methods in the preparation of SiC ceramic materials.

RBSC ceramic materials not only maintain the high strength, wear resistance, impact resistance and other mechanical properties of SiC ceramics, but also have excellent thermal properties such as high thermal conductivity and high heat shock. Therefore, RBSC ceramic materials have very broad application prospects in fields such as sealant resistance, gas rotors, optical mirrors, precision bearings, and personal protection.

Focusing on the research and application of high-performance silicon carbide ceramics

The research and application of high-performance silicon carbide ceramics have attracted extensive attention from scholars in various fields at home and abroad. In recent years, the Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, has made some progress in the research of high-performance silicon carbide ceramics, such as important progress in the processing technology of refractory silicon carbide materials, and progress in the development of high-quality silicon carbide ceramic precursors, A new type of densification sintering additive for silicon carbide ceramics has been developed and prepared.

From 27 to 28 August 2018, China Powder Network will hold the "2019 Second New Ceramic Technology and Industry Summit Forum" in Changsha, where Huang Zhengren, Director of Research and Application of High Performance Silicon Carbide Ceramics, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, will be invited to give a wonderful report.

Professor Huang Zhengren, doctoral supervisor, director of Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, member of the National Advisory Committee of Experts on the Development of New Materials Industry, and member of the 863 Special Expert Group on New Materials.

Research direction and achievements: Professor Huang Zhengren focuses on the research on the composition, structure, stress design and preparation of advanced structural ceramics, strengthening and toughening of carbide, oxide composite ceramics and ceramic matrix composite, wet forming of non oxide ceramics Research on the Preparation and Performance of Non oxide Nanopowders and Metal ceramic Nanocomposite Powders In the development of large-diameter lightweight silicon carbide space optical elements and high-performance silicon carbide heat exchange elements, ceramic material surface modification, ceramic materials low stress, high reliability connection, ultra-high temperature ceramic materials and advanced ceramic materials and components nondestructive testing, he has led the completion of NSFC key projects, 973 projects There are more than 40 important scientific research projects of national key projects such as the 863 Program, the Knowledge Innovation Direction Project of the Chinese Academy of Sciences, the basic research project of Shanghai, and the key scientific and technological research project of Shanghai.

resources:

Wang Hao. Theoretical Study on Heat Transfer and Microstructure of High Temperature Ceramic Materials

Zeng Fan. Preparation of Reaction Sintered Silicon Carbide Ceramics and Enhancement of Silicon Carbide Nanowires

Liu Minggang. Pressure free sintering and properties of silicon carbide ceramics