Al2O3 SINTERING MATERIAL, PROCESS FOR THE PRODUCTION OF SAID MATERIAL AND USE THEREOF

摘要

The invention relates to ceramics and concerns Al2O3 sintering materials made from corundum powder, a process for the production of the said materials and their use as, for example, human implants or as a material for tools. According to the invention, high-grade, low-defect Al2O3 sintering materials with very high degrees of hardness or high degrees of hardness and strength are produced containing 95-100 vol.% Al2O3 and a Vickers micro hardness of >/= 2000 at a test load of 10-100 N; these sintering materials have a relative sinter density delta >/= 98.5 %, grain structure with a mean grain size of m<-2>. According to the invention, Al2O3 sintering materials are also produced containing 95-100 vol.% Al2O3 and a Vickers micro hardness of >/= 1750 at a test load of 10-100 N and a bending strength of >/= 800 MPa, with a relative sinter density delta >/= 98.5 %, grain structure with a mean grain size of . In order to produce Al2O3 sintering materials of this kind from corundum powder, alpha -Al2O3 powder with defined characteristics is used in at least two different dispersion processes to produce an initially unsintered preliminary product with a relative density delta >/= 55 % which then undergoes heat treatment and sintering.