Micro Hardness Evaluation Of Non-Oxide Ceramic-Ceramic Composites.

      Аннотация: Micro-hardness and fracture toughness research studies on various non oxide ceramics have been carried out. These ceramics include silicon carbide, silicon nitride and the composites of silicon nitride. Micro-hardness measurement of these ceramics i.e. vicker and knoop was carried out using diamond indenters. Various influences of load and time of indentation on hardness values of these ceramics have been carried out in detail. Fracture toughness of these ceramics was also studied using vicker indentation. The vicker and knoop hardness of these ceramics decreases with increasing load, similar influence was observed by increasing time of indentation. Fracture toughness of Silicon nitride doped with TiN is higher than the other ceramics and silicon carbide doped with boron and carbon has shown higher hardness as compared to other ceramics.

Ключевые слова: harness, vicker, knoop, Ceramics