Nonaqueous Slip Casting of High Temperature Ceramic Superconductors Using an Investment Casting Technique

Résumé du livre

"Previous ceramic casting methods involve placing a ceramic powder in water to form a slip which is placed in a plaster of Paris mold to remove the water from the slip leaving the ceramic article. Some ceramic powders, including high-temperature superconductors, are chemically unstable in water, making this process unsuitable for casting articles from these water-sensitive ceramics. A process is provided for slip casting ceramic articles that does not employ parting agents and affords the casting of complete, detailed, precision articles that do not possess parting lines. In this method, the slip is formed by dispersing a ceramic powder in an organic liquid. The slip is poured into a mold made from a mixture of a calcium sulfate-bonded investment material of calculated silica and fiberglass. This mold removes the organic liquid from the slip, leaving the ceramic article which is fired to provide a complete, detailed, precision, high temperature superconductive ceramic article without parting lines. The casting technique may take place in the presence of a magnetic field to orient the ceramic powders during the casting process. The novelty of this method is found in providing a casting method for producing ceramic articles which is especially useful when water-sensitive or high-temperature superconductor ceramic powders are being used."--Page i.