Paper Title:
Surface Hardening of BN-Al Ceramic Composites
  Abstract

Ceramic composites containing BN and Al can be machined easily into complex shape, the hardness of the composites can also be improved by surface hardening process of in situ reaction between Al and BN. However, the reaction of Al and BN is a volume reduced one and the porosity will increase during the hardening treatment.. In order to solve this problem, a surface nitriding process was developed. Put the pre-sintering samples (with designed shapes) into a vacuum furnace in nitrogen atmosphere and reheated to high-temperature, so that the residual Al after pre-sintering would react with N2 completely, and change to AlN which has higher hardness. The phase transformation and microstructure were observed and the mechanical and other properties were also measured. The results showed that the surface nitriding process could increase the hardness, bending strength and density obviously. The porosity decreased sharply compared with the general hardening treatment.

  Info
Periodical
Advanced Materials Research (Volumes 105-106)
Edited by
Wei Pan and Jianghong Gong
Pages
112-114
DOI
10.4028/www.scientific.net/AMR.105-106.112
Citation
Y. Li, H. Y. Jin, X. D. Wang, G. J. Qiao, "Surface Hardening of BN-Al Ceramic Composites", Advanced Materials Research, Vols. 105-106, pp. 112-114, 2010
Online since
April 2010
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Tao Zhang, Hai Yun Jin, Yong Ian Wang, Zhi Hao Jin
Abstract:AlN/BN laminated ceramic composites were fabricated using tape-casting and hot-pressing by optimizing the designs of the structure and...
97
Authors: Hai Yun Jin, Ying Li, Xiang Ya Jia, Guan Jun Qiao
Abstract:In order to obtain machinable ceramic with high hardness and strong mechanical properties, the SiC/Al/h-BN Composite Ceramics were fabricated...
363
Authors: Tao Zhang, Wen Zhao Li, Hai Yun Jin, Guan Jun Qiao, Zhi Hao Jin
Abstract:The AlN/Ti laminated composites were fabrication by plasma activated sintering. In the composites, the AlN layers were matrix layers and the...
348
Authors: Rosa Maria da Rocha, Francisco Cristóvão Lourenço de Melo
Abstract:The effect of three different sintering additive systems on densification of boron carbide powder was investigated. The sintering additives...
170
Authors: Shu He Ai, Yu Jun Zhang, Hong Yu Gong, Qi Song Li
Abstract:AlN/SiC composites with 5 wt.% Y2O3 addition were fabricated by pressureless sintering at 1700-1950 oC. The influences...
78