期刊
CERAMICS INTERNATIONAL
卷 34, 期 6, 页码 1551-1556出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2007.05.003
关键词
Al2O3; alumina; mechanical milling; milling media; contamination
The mechanical milling of alumina in order to reduce grain sizes to <= 100 nm has been proposed as a means of reducing sintering temperatures and improving pressureless sintered density, particularly as a means of allowing co-firing with metallic components for biomedical implants. There is a persistent problem with contamination from the milling media, usually hardened steel which can be only partially alleviated by acid leaching. We have explored the use of alternative milling media with a view to reducing the levels of contamination. Alumina powders were milled with hardened steel, tungsten carbide, alumina and zirconia milling media under identical conditions of ball mass:powder mass ratio 10: 1 and target milling times of 32 h. All of the milling media were found to cause unacceptable levels of contamination. Zirconia media gave the lowest contamination (3-4%) and in some circumstances, the addition of a small amount of zirconia may lead to increased toughness without loss of biocompatibility. (C) 2007 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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