METHOD FOR THE PRODUCTION OF THERMAL SPRAYED AL2O3 LAYERS HAVING A HIGH CONTENT OF CORUNDUM WITHOUT ANY PROPERTY-REDUCING ADDITIVES

摘要

The disclosure provides a method of producing thermally sprayed Al2O3 coatings having a high content of corundum without any property-reducing additives. The coatings may be utilized particularly in the field of electrical insulation, as a dielectric, and as protection from wear. The thermally sprayed Al2O3 coatings have a porosity of no more than 19%, and a high content of -Al2O3 (content of corundum) of at least 72% by volume. The coatings have a specific electrical resistance of 1·1012 Ohms·cm, and a purity of 97%. The production of said coatings is carried out utilizing aqueous or alcoholic suspensions made from substantially pure -Al2O3, having a grain size of 100 nm by thermal spraying.