Thermally sprayed ai2o3 coatings having a high corundum...

C - Chemistry – Metallurgy – 23 – C

Patent

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Details

C23C 4/10 (2006.01) C23C 4/12 (2006.01)

Patent

CA 2726434

The invention relates to thermally sprayed Al2O3 layers having a high content of corundum without any property-reducing additives, and to a method for the production of said layers. The invention may be utilized particularly in the field of electrical insulation, as a dielectric, and as protection from wear. According to the invention, the thermally sprayed Al2O3 layers are characterized in that they have a porosity of no more than 19%, and a high content of -Al2O3 a(content of corundum) of at least 72% by volume. The layers have a specific electrical resistance of > 1 .cndot. 10 12 Ohms .cndot. cm, and a purity of > 97%. The production according to the invention of said layers is carried out utilizing aqueous or alcoholic suspensions made from pure -Al2O3, having a grain size of > 100 nm by means of a method from the group of thermal spraying.

L'invention concerne des couches d'Al2O3 pulvérisées thermiquement, à haute teneur en corindon et sans additif diminuant les propriétés, ainsi qu'un procédé pour la fabrication de ces couches. L'invention peut être utilisée en particulier dans le domaine de l'isolation électrique, comme diélectrique et pour la protection contre l'usure. Selon l'invention, les couches d'Al2O3 pulvérisées thermiquement sont caractérisées en ce qu'elles présentent une porosité d'au plus 19 % et une haute teneur en a-Al2O3 (teneur en corindon) d'au moins 72 % en volume. Les couches ont une résistance électrique spécifique > 1 1012 Ohm cm et une pureté > 97 %. La fabrication selon l'invention de ces couches s'effectue en recourant à des suspensions aqueuses ou dans l'alcool d'a-Al2O3 pur d'une granulométrie de > 100 nm, au moyen d'un procédé sélectionné dans l'ensemble des pulvérisations thermiques.

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