18-11-2021 дата публикации
Номер: US20210355585A1
The present invention relates to a method and an apparatus for coating large area solid substrates such as flakes, powder, beads, and fibres with metal-based coatings by heating the substrate with a powder mixture including reducible metal oxides and a reducing agent. The method is particularly suited for production of substrates coated with metals, alloys and compounds based on Ti, Al, Zn, Sn, In, Sb, Ag, Co, V, Ni, Cr, Mn, Fe, Cu, Pt, Pd, Ta, Zr, Nb, Rh, Ru, Mo, Os, Re and W. 1. A method for depositing a metal-based coating on a particulate substrate , including:a) Preparing a mixture comprising a particulate substrate; and a powder comprising a coating metal oxide of one or more of Ti, Al, Zn, Sn, In, Sb, Ag, Co, V, Ni, Cr, Mn, Fe, Cu, Pt, Pd, Ta, Zr, Nb, Rh, Ru, Mo, Os, Re and W; anda reducing agent powder based on Mg or Al; andb) Mixing and heating the mixture to form a coating on said particulate substrate, to produce a coated substrate product.2. A method according to wherein the said mixture further comprises a reducing metal chloride being AlClor MgCl; and wherein the weight of the reducing metal chloride is between 1 wt % and 500 wt % of the coating metal oxide.3. A method according to any one of or claim 1 , comprising the steps of:immersing a substrate powder in a reactant mixture comprising the coating metal oxide and the reducing agent powder and optionally one or more coating additives, and heating and mixing the resulting mixture at temperatures between 100° C. and 900° C. to induce reactions between the substrate surface and the said mixture and form a coating on the substrate; andcondensing by-products away from a reaction zone where the reducing agent and reactant mixture are reacting; andseparating the coated substrate from residual un-reacted materials.4. A method according to for coating particulate substrates wherein the reducing metal chloride is aluminium chloride; and the method includes the steps of condensing volatile by-products away ...
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