Effect+of+Al+and+Si+additions+on+microstructure+and+mechanical+properties+of+TiN+coatings.pdf

文档介绍：J. Cent. South Univ. Technol. (2011) 18: 310−313
DOI: −011−0696−4

Effect of Al and Si additions on microstructure and
mechanical properties of TiN coatings

WANG She-quan(王社权)1, 2, CHEN Kang-hua(陈康华)1, CHEN Li(陈利)2,
ZHU Chang-jun(祝昌军)1, LI Ping(李屏)2, DU Yong(杜勇)1

1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;
2. Zhuzhou Cemented Carbide Cutting Tools Co., Ltd, Zhuzhou 412007, China

© Central South University Press and Springer-Verlag Berlin Heidelberg 2011


Abstract: Ti-X-N (X=Al, Si or Al+Si) coatings were grown onto cemented carbide substrates by cathodic arc evaporation. The
hardness of the coatings was obtained by nanoindentation and the microstructure was investigated by XRD, XPS and SEM. Solid
solution hardening results in a hardness increase from 24 GPa for TiN to GPa for TiAlN. The higher hardness values of
GPa for TiSiN and GPa for TiAlSiN are obtained by the incorporation of Si into TiN (TiAlN) coatings due to the formation
of special three- structure consisting of nanocrystalline (nc) TiN (TiAlN) encapsulated in an amorphous (a) Si3N4
matrix phase. Furthermore, the nc-TiAlN/a-Si3N4 coating shows the best machining performance.

Key words: TiN coating; alloying element; hardness; cutting test


microstructural evolution of