Monazite-based coatings for thermal protection systems
AssigneeThe Boeing Company
InventorsJanet B. Davis, David B. Marshall, Peter Ernest David Morgan, Kris Shigeko Oka
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Abstract
Monazite or xenotime-based blanket coatings that stiffen ceramic fabrics without causing embrittlement at temperatures of at least as high as 2400° F. are provided. Methods for making the coatings are also provided. The methods comprise the synthesis of high purity, monazite and xenotime powders with the stoichiometric ratio of metal to phosphorous of about 1:1.
Claims18
A method for producing a monazite or xenotime comprising:
- (a) forming a precipitate from an aqueous solution comprising a lanthanide salt and a phosphate;
- (b) washing the precipitate with water;
- and
- (c) washing the precipitate with an organic base with a pH greater than about 12.
A method for producing a monazite- or xenotime-based coating, comprising:
- (a) forming a precipitate from an aqueous solution comprising a lanthanide salt and a phosphate;
- (b) washing the precipitate with water;
- (c) washing the precipitate with an organic base with a pH greater than about 12;
- (d) calcining the precipitate of step (c);
- (e) milling the calcined precipitate of step (d) to form a powder;
- and
- (f) forming an aqueous slurry comprising the powder of step (e) and inert powder.
A monazite- or xenotime coating composition comprising a high purity monazite or xenotime, wherein the monazite or xenotime is synthesized by forming a precipitate from an aqueous solution comprising a lanthanide salt and a phosphate, washing the precipitate with water, and washing the precipitate with an organic base with a pH of greater than about 12, the coating composition further comprising an Inert powder.
A monazite- or xenotime coating composition comprising a high purity monazite or xenotime, wherein the monazite or xenotime is synthesized by forming a precipitate from an aqueous solution comprising a lanthanide salt and a phosphate, washing the precipitate with water, and washing the precipitate with an organic base with a pH of greater than about 12, the coating composition further comprising SiC additives.
Dependencies are inferred from the claim text.