A study in the mechanical milling of alumina
A study in the mechanical milling of alumina
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DOI：
10.1016/j.ceramint.2007.05.003
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发表时间：
2008-08
期刊：
影响因子：
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通讯作者：
C. Reid;J. Forrester;Heather J. Goodshaw;E. Kisi;G. Suaning
中科院分区：
文献类型：
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作者：
C. Reid;J. Forrester;Heather J. Goodshaw;E. Kisi;G. Suaning
已提出将氧化铝的机械研磨以将晶粒尺寸减小至≤ 100 nm作为降低烧结温度和改善无压烧结密度的方法，特别是作为允许与用于生物医学植入物的金属组件共烧的方法。存在来自研磨介质（通常为硬化钢）的污染的持续性问题，其只能通过酸浸出部分缓解。我们已探索使用替代研磨介质，以降低污染水平。氧化铝粉末与硬化钢、碳化钨、氧化铝和氧化锆研磨介质在球质量：粉末质量比10：1和目标研磨时间32小时的相同条件下研磨。发现所有研磨介质均导致不可接受的污染水平。氧化锆介质的污染最低（3-4%），在某些情况下，添加少量氧化锆可能会导致韧性增加，而不会丧失生物相容性。
The mechanical milling of alumina in order to reduce grain sizes to ≤100nm 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 32h. 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 bio-compatibility.