Conventional and new approaches towards the design of novel superhard materials

被引：129

作者：

Veprek, S ^{[1
]}

机构：

[1] Tech Univ Munich, Inst Chem Inorgan Mat, D-85747 Munich, Germany

来源：

SURFACE & COATINGS TECHNOLOGY | 1997年 / 97卷 / 1-3期

关键词：

superhard materials; C3N4; nanocrystalline composites; TiN; W2N; VN; Si3N4;

D O I：

10.1016/S0257-8972(97)00279-X

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

We present recent results on the preparation of stoichiometric C3N4 and its hardness which is far below the theoretically expected value. A comparison with the turbostratic substoichiometric CN0.2-0.35 films prepared by Sundgren et al. shows the dominant importance of the microstructure. Based on some general rules a concept for the design of thermodynamically stable superhard nanocrystalline composite materials is presented and verified experimentally on three systems: nc-TiN/a-Si3N4, nc-VN/a-Si3N4 and nc-W2N/a-Si3N4. Hardness of about 5000 kg mm(-2) (about 50 GPa) or more and a high elastic modulus of 550 GPa were found in all these systems. (C) 1997 Published by Elsevier Science S.A.

引用

页码：15 / 22

页数：8

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