Whisker-reinforced ceramic material
AssigneeSandvik AB
InventorsMats Andersson, Marianne Collin
Life of this patent
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Abstract
There is now provided a ceramic material comprising of alumina, 10-50% by volume, preferably 20-35% by volume, silicon carbide whiskers, 1-25% by volume, preferably 5-20% by volume, most preferably 7-15% by volume, zirconia and 1-20% by volume, preferably 3-15% by volume, titanium compound-containing cubic phase. If this cubic phase has a lattice spacing of 4.29 to 4.40 .ANG. and a zirconium content of 3-65 weight %, a material with improved performance when turning heat resistant material such as aged Iconel 718, is obtained.
Claims7
A method of manufacturing a ceramic material comprising alumina, 10-50% by volume of silicon carbide whiskers, 1-25% by volume of zirconia and 1-20% by volume of a titanium compound-containing cubic phase comprising mixing and granulating powders of silicon carbide whiskers, alumina and zirconia and a titanium compound capable of forming a cubic phase and hot pressing the mixture at a hot press temperature of 1500.degree.-1750.degree. C. a mechanical pressure of 5-40 MPa having a heating up period before the hot pressing temperature is reached and the mechanical pressure is applied, being performed under a subpressure of 50 to 800 mbar.
Dependencies are inferred from the claim text.