| 摘要 |
Adherent coatings of metal oxides are produced by directing atomized aqueous solutions of oxygen-containing substantially non-hydrated metal salts or compounds that are thermally decomposible at 400 DEG F. to 1200 DEG F. to yield directly refactory metal oxides and are present in amounts corresponding to metal oxide contents of 0.1 to 10 per cent, against surfaces having temperatures of 400 DEG F. to 1200 DEG F. to effect such decomposition, release metal oxide particles in discrete form to contact with and adhere to the surfaces, and to volatilize the volatile components within a short period before and until substantially the instant of contact between the particles and the surfaces. Compounds which may be employed include the ammonium carbonate double salts of magnesium, calcium, barium, strontium, aluminium, titanium, zirconium, hafnium and cerium, the nitrates of the metals of Groups IIA (Mg, Car Ba and Sr); IIB (Zn and Cd); IIIA (Sc. Y and La); IIIB (Al, Ga, In and T1); IVA (Ti, Zr and Hf); IVB (Pb and Sn); VIA (Cr. Mo and W); VIIA (Mn); thorium and the rare-earth metals, acetates and in some cases nitrates, phosphates or phosphites may be used. Ammines or ammonia complexes of the metal salts are preferred; ethylene diamine complexes may also be used. The surface coated may be metal, carbon, or a ceramic or inorganic material such as mortar or fire brick; a vitreous coating may be applied over the metal oxide coating. |
