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US 10,702,920 B2Granted
Coating of particulate substrates
AssigneeOthrys Technologies PTY LTD
InventorJawad Haidar
Life of this patent
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Abstract
The present invention relates to a method for coating large area solid substrates with titanium by reacting the substrate surface with a mixture comprising titanium halide or subhalide powders in the presence of a reducing agent. The method is suited for coating large area substrates such as flakes, powder, beads and fibres with elemental Ti-base metals or alloys of Ti with coating additives based on any number of non inert elements from the periodic table.
Claims19
A method for forming Ti-based coatings on a particulate substrate, including:
- a) forming an uncoated Ti-based powder by reacting at least one solid titanium subchloride with a solid Al reducing agent, wherein the Al reducing agent is an Al powder or an Al alloy powder;
- b) mixing the particulate substrate with the uncoated Ti-based powder;
- and
- c) heating the particulate substrate in contact with said uncoated Ti-based powder to a temperature less than 850° C. to produce a coating on said particulate substrate.
1 more element
A method for forming Ti-based coatings on a particulate substrate, including:
- mixing, stirring and heating a mixture comprising at least one titanium subchloride, a solid Al reducing agent, a coating additive and a particulate substrate in the form of a powder, at temperatures between a first temperature T0 above 160° C. and a maximum temperature Tmax below 850° C. to form the Ti-based coating on the substrate and by-products including aluminium chloride and titanium tetrachloride;
- wherein the Al reducing agent is in a fine particulate form and an amount of Al is sufficient to reduce the at least one titanium subchloride to a composition with a chlorine content less than TiCl2;
- the coating additive includes sources for at least one of C, Si, B, O2 and N2, and the coating is based on titanium in the form of at least one of a titanium carbide, silicide, boride, oxide or nitride, and
- condensing the by-products away from a reaction zone where the Al reducing agent and the at least one titanium subchloride are reacting;
- and
- collecting reaction products, and separating the coated substrate from residual un-reacted materials, and washing and drying the coated substrate.
3 more elements
Dependencies are inferred from the claim text.