Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.13/43410
- A study in the mechanical milling of alumina powder
Reid, Caroline B.;
Forrester, Jennifer S.;
Goodshaw, Heather J.;
Kisi, Erich H.;
Suaning, Gregg J.
- The University of Newcastle. Faculty of Engineering & Built Environment, School of Engineering
- 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.
- Ceramics International Vol. 34, Issue 6, p. 1551-1556
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- journal article