Affiliation:
1. Inha University
2. Yeungnam University
3. University of Incheon
4. University of California, Davis
Abstract
The effects of h-BN content on the microstructure, mechanical properties, and
machinability of Si3N4 ceramics were investigated. The relative density of the sintered compact decreased with increasing BN content. The flexural strength also decreased with h-BN content, mainly due to lower Young’s modulus of h-BN compared to Si3N4. With increasing h-BN content, Si3N4/h-BN based ceramic composites revealed enhanced crack resistance (R-curve) behavior. The
Vickers indentation crack paths in specimens are sinusoidal due to bridging and pull out of grains during crack propagation. The grain size of ß-Si3N4 slightly decreased with h-BN content. During milling and micro-drilling process, monolithic Si3N4 ceramic could not be machined, due to brittle fracture. However, thrust forces measured for Si3N4/h-BN composites decreased with increasing h-BN content, showing the excellent macro and micro machinabilty.
Publisher
Trans Tech Publications, Ltd.
Subject
Mechanical Engineering,Mechanics of Materials,General Materials Science
Reference7 articles.
1. T. Kusunose, T. Sekino, Y. H. Choa, and K. Niihara: J. Am. Ceram. Soc., Vol. 85 (2002), p.2689.
2. W. Ruigang, Pan Wei, Chen Jian, J. Mengning and F. Minghao: Materials Research Bulletin, Vol. 37 (2002) p.1269.
3. T. Kusunose, T. Sekino, Y. H. Choa, and K. Niihara: J. Am. Ceram. Soc., Vol. 85 (2002), p.2678.
4. R. F. Krause, Jr: J. Am. Ceram. Soc., Vo. 71 (1988), p.338.
5. R. Warren: Ceramic matrix composite, (Chapman and Hall, New York, 1992) (a (b 0 5 10 15 20 25 30 0. 0 0. 4 0. 8 1. 2 1. 6 2. 0 Thrust force (N) h-BN content (vol%) Dia : 0. 15 mm.
Cited by
6 articles.
订阅此论文施引文献
订阅此论文施引文献，注册后可以免费订阅5篇论文的施引文献，订阅后可以查看论文全部施引文献