Rmi Titanium Company

Rmi Company

Richard L Fisher

Stanley R Seagle

The invention relates to a process for the removal of oxides and/or oxygen which are formed on the surface of the casting during the investment casting process to levels that are comparable to those found within the bulk of the metal casting thus reducing the inherent hardness of the surfaces of the casting. More specifically, the invention relates to a process for removing oxide layers from titanium casting using an alkaline earth deoxidizing agent.

Removal of oxide layers from titanium castings using an alkaline earth

A process for the deoxidation of a refractory metal containing minor concentrations of oxygen is disclosed. In this process the refractory metal is contacted with a metallic deoxidant in a dry, inert atmosphere. The metallic deoxidant and the refractory metal are heated to at least liquefy the metallic deoxidant and at least partially deoxidize the refractory metal. The refractory metal is thereafter cooled and contaminants on its surface are removed.

Deoxidation of a refractory metal

Process for deoxidizing refractory metals such as titanium which contain less than about one percent oxygen. The process described includes heating a liquid metal deoxidant contained in a liquid metal carrier to treat the oxidized metal. After removing the carrier and cooling, the metal is leached to result in a treated metal with lower residual oxygen. In a preferred embodiment, titanium alloy powders are deoxidized with calcium in a sodium carrier.

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Warren, OH, United States of America

Richard L Fisher