Coated abrasive materials and method of manufacture
OwnerAntionette Can, Anna Emela Mochubele +2inventors
InventorsAntionette Can, Anna Emela Mochubele, Geoffrey John Davies, Johannes Lodewikus Myburgh
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Abstract
A method of coating ultrahard abrasive particles having vitreophilic surfaces, or treated to render their surfaces vitreophilic, are coated with an oxide precursor material, which is then heat treated to dry and purify the coats. The heat treated, coated ultrahard abrasive particles are further treated to convert the coats to an oxide, nitride, carbide, oxynitride, oxycarbide, or carbonitride thereof, or an elemental form thereof, or a glass.
Claims36
A method of coating ultrahard abrasive particles, comprising:
- providing a plurality of ultrahard abrasive particles selected from the group consisting of diamond, cubic boron nitride, and a combination thereof, wherein the ultrahard abrasive particles have vitreophilic surfaces which form chemical bonds with oxides;
- coating the ultrahard abrasive particles with an oxide precursor material selected from the group consisting of an amorphous or nano-crystalline oxide, a hydroxide, and an oxo-hydroxide;
- and
- heat treating the coated ultrahard abrasive particles to dry and purify the coats.
The method according to claim I, wherein the coated ultrahard abrasive particles are treated to convert the oxide precursor material to an oxide, nitride, carbide, oxynitride, oxycarbide, or carbonitride of the oxide precursor material, or an elemental form of the oxide precursor material, or a combination thereof.
The method according to claim. 15, wherein the alkoxide is an alkoxide of an element selected from the group consisting of aluminum, titanium, silicon, zirconium, vanadium, niobium, tantalum, chromium, molybdenum, tungsten, hafnium, and yttrium.
A coated ultrahard abrasive particulate material comprising diamond or cubic boron nitride particles of sub-micron or nano size with coats selected from the group consisting of nitrides of titanium, vanadium, niobium, tantalum, molybdenum, or tungsten, and carbides of vanadium, niobium, tantalum, molybdenum, or tungsten.
A coated ultrahard abrasive particulate material comprising diamond or cubic boron nitride particles of sub-micron or nano size with coats selected from the group consisting of anatase phase titania, rutile phase titania, tetragonal zirconia, monoclinic zirconia, zirconia stabilized with yttria or magnesia, the transient structures and alpha phase of alumina, and the oxides of vanadium, niobium, tantalum, hafnium, molybdenum, and tungsten.
A coated ultrahard abrasive particulate material comprising diamond or cubic boron nitride particles of sub-micron or nano size coated with silica glass.
A coated ultrahard abrasive particulate material comprising diamond or cubic boron nitride particles of sub-micron or nano size with coats selected from the group consisting of oxides of titanium, vanadium, niobium, tantalum, aluminium, silicon, molybdenum, or tungsten, nitrides or carbides of titanium, vanadium, niobium, tantalum, or molybdenum, and molybdenum or tungsten metal.
Dependencies are inferred from the claim text.