Influence of grain size on the grinding response of alumina
- National Inst. of Standards and Technology, Gaithersburg, MD (United States)
The effect of grain size on the grinding response, i.e., grinding forces, surface roughness, and grinding-induced subsurface damage, is investigated in a series of alumina ceramics with the average grain size ranging from 3 to 35 {micro}m. The grinding forces are measured as a function of depth of cut in surface grinding. It is found that the grinding forces decrease as the grain size is increased from 3 to 9 {micro}m. But at larger grain sizes, the grinding forces are independent of the grain size. Subsurface damage in grinding is observed using a bonded-interface sectioning technique. The subsurface damage is found to consist of intragrain twin/slip bands and intergranular microcracks. The density of grinding-induced subsurface microcracks increases with the grain size. In addition to using optical microscopy on the sections of the ground specimens, a nondestructive thermal wave measurement technique is used directly on the ground surfaces for the detection of grinding-induced subsurface microcracks. The grain size dependence of the microcrack density estimated from the thermal images is found to agree with the results obtained using the bonded-interface technique.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 253569
- Journal Information:
- Journal of the American Ceramic Society, Vol. 79, Issue 5; Other Information: PBD: May 1996
- Country of Publication:
- United States
- Language:
- English
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