| 摘要 |
PROBLEM TO BE SOLVED: To provide simple and reliable investment casting methods which allow easy extraction of near-net-shape metal or metal alloys from an investment mold that does not react significantly with the metal or metal alloy.SOLUTION: The disclosure relates generally to mold compositions and to methods of molding and articles so molded. More specifically, the disclosure relates to a mold for casting a titanium-containing article, comprising calcium aluminate and silicon carbide, where the silicon carbide is graded in the mold such that it is in different portions of the mold in different amounts, with the highest concentration of silicon carbide being located between a bulk of the mold and a surface of the mold that opens to a mold cavity. |
