What is the best proportion in producing alumina-zirconia ceramic inclusive of other additives such as Calcium oxide, silicon oxide, iron oxide, magnesium oxide etc.
Jose Eduardo Vasconcellos Amarante best proportion mix in producing Alumin-Zirconia Ceramic
HI Afeez,
this strongly depends on the application. Typically up to 10 vol% zirconia can be added without stabilizing by yttria, higher contents require a gradually rising yttria content. From 7% zirconia upwards the dispersion provides significant inhibition of the alumina grain growth.
the most important thing is the homogeneous distribution of the phases and a zirconia dispersion in the correct size range (Powder choice and processing !!).
some examples:
cutting tools - typically 6-10 vol% zirconia, Rest alumina
biomedical implants 12-17% zirconia 0.5-1.5 mol% yttria in zirconia, rest alumina.
There are some general tendencies, the hardness inversely scales with zirconia content, the grain size declines with increasing zirconia content, the fracture toughness shows an intermediate maximum between 10-20 vol% zirconia, the strength rises with zirconia content.
I would reccommend to read the old papers by Fred Lange, and the latest publications from the group of Jerome Chevalier and from my side.
I would further recommend not to play around with further additives too much before you have understood the basic ZTA material.
best regards
Frank
Frank Kern thank you very much for the insight. I intend using the ZTA ceramic in production of ballistic plates. I'l use 10% Zirconium oxide and see how it comes out.
Thank you.
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