Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/27707
Title: Ultrasonic erosion of whisker-reinforced ceramic composites
Authors: Lee, TC
Deng, J
Issue Date: 2001
Source: Ceramics international, 2001, v. 27, no. 7, p. 755-760
Abstract: Uniaxial hot-pressing of SiC whisker reinforced Al2O3 ceramic composites induces an anisotropy in whisker distribution and leads to a composite with anisotropic mechanical properties. In this paper, the effects of whisker orientation on the material removal rates and mechanisms in ultrasonic machining of Al2O3/SiCw ceramic composites are reported. It was found that the material removal rates and machined surface roughness in ultrasonic machining of the composites varied according to the angle θ to the hot pressing direction. The maximum material removal rate and surface roughness were observed for the machining surface perpendicular to the hot-pressing direction (θ=0°), and the minimum ones were observed for the machining surface parallel to the hot-pressing direction (θ=90°). This effect was larger for specimens with higher SiC whisker content. Based on the lateral crack fracture analysis in ultrasonic machining of the composites, the mechanisms responsible for the anisotropy in material removal rates caused by whisker orientation were investigated.
Keywords: Ceramic composite
Ultrasonic machining
Whisker orientation
Publisher: Pergamon Press
Journal: Ceramics international 
ISSN: 0272-8842
EISSN: 1873-3956
DOI: 10.1016/S0272-8842(01)00026-8
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