Expendable core for casting processes

Abstract From the Canadian patent

A method is provided for forming a sand core which is suitable for use in casting processes, and in particular squeeze casting processes to form, internal features and intricate external features of a cast article. The core forming method involves the use of a single-component gelatin binder whose degradation at elevated temperatures is catalyzed by additions of a ferric compound. The gelatin binder is a mixture of proteins derived from amino acids such as glycine, L-proline, alanine L-glutamic acid, L-aspartic acid, and/or small percentages of others such that the gelatin binder is water soluble and therefore easily eliminated from the core sand at the end of the casting process. Due in …