Patent ID: 7645814
Filing Date: 2010-01-12
Classification: B22C

Abstract:
1. A process for producing a casting mold comprising: providing a composition comprising a base mold material, a binder, an acidifier and a gas generating pore former, including controlling a release of gas by adding the acidifier to the gas generating pore former in a controlled wt. fraction wherein release of gas from the gas generating pore former is controlled as a function of wt. fraction of the added acidifier and the gas generating pore former, wherein the acidifier is present in a wt. fraction of between 0.2 to 0.7 parts by weight with respect to 100 parts by weight of the base mold material and the gas generating pore former is present in a wt. fraction of between 0.5 to 1.0 with respect to 100 parts by weight of the base mold material; and forming a casting mold from the composition.