ON MICROSTRUCTURAL DESIGN OF CERAMICS

Abstract

A methodological approach to the design of ceramics with predetermined composition and microstructure is proposed. Its principal idea is to implement the accumulated knowledge into existing technologies or the development of novel science-based technologies. Both the choice of a known microstructure and the design of a novel one are based on the knowledge accumulated so far on material structurization and properties as follows: knowledge systematization – analysis – generalization – establishment of regularities. The ideology of designing a novel material with predetermined microstructure consists in implementing the following sequence of stages: knowledge-based choice of microstructure and sintering conditions → manufacture of a pilot sample of the material (prototype) →– investigation of the properties→– optimization of the microstructure and properties → technology. An algorithm is also proposed for designing a material with required microstructure, which can be achieved via arrangement of coordinated structural transformations during sintering, whose evolution determines the formation of planned microstructural elements, their crystalline morphology, scale, content, and distribution throughout the volume. An example is presented for designing the microstructure of silicon carbide material with a SiC–В₄C eutectic binder.