US Patent Issued to Rolls-Royce High Temperature Composites on Feb. 25 for "Methods to eliminate mudcracks in CMC matrix by humidity controlled atmosphere" (California Inventors)

ALEXANDRIA, Va., Feb. 26 -- United States Patent no. 12,233,572, issued on Feb. 25, was assigned to Rolls-Royce High Temperature Composites Inc. (Cypress, Calif.).

"Methods to eliminate mudcracks in CMC matrix by humidity controlled atmosphere" was invented by Pathikumar Sellappan (Seal Beach, Calif.) and Sungbo Shim (Irvine, Calif.).

According to the abstract* released by the U.S. Patent & Trademark Office: "Methods of reducing dry crack formation in ceramic matrix composite green bodies are provided. Some of the methods expose the green body to a gaseous atmosphere at a relatively high humidity for a first period, and then slowly lower the humidity over a second period, where the gaseous atmosphere is at room temperature for both period...