- Title
- A study in the mechanical milling of alumina powder
- Creator
- Reid, Caroline B.; Forrester, Jennifer S.; Goodshaw, Heather J.; Kisi, Erich H.; Suaning, Gregg J.
- Relation
- Ceramics International Vol. 34, Issue 6, p. 1551-1556
- Publisher Link
- http://dx.doi.org/10.1016/j.ceramint.2007.05.003
- Publisher
- Elsevier
- Resource Type
- journal article
- Date
- 2008
- Description
- 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 bio-compatibility.
- Subject
- Alumina; contamination; D. Al₂O₃; mechanical milling; milling media
- Identifier
- uon:5523
- Identifier
- http://hdl.handle.net/1959.13/43410
- Identifier
- ISSN:0272-8842
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