Method for controlling dimensions of RSPD articles
AssigneeGeneral Electric Company
InventorsPaul A. Siemers, Robert W. Kopp, Melvin R. Jackson
Life of this patent
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Abstract
A method is provided for forming articles from difficult to fabricate materials with precise internal dimensions. The article is first formed to approximate dimensions as a body using the material in powdered form. Plasma spray forming is proposed. The powder formed body is then brought to its final dimensions by consolidating and densifying the body about a densifying mandrel having a coefficient of expansion which is higher and outer dimensions which are slightly smaller than that of the body.
Claims8
A method of forming an article to close internal dimensions from a difficult to fabricate material which comprises providing the material in a finely divided form, low pressure plasma spraying the material to form a body having a density less than 100% of its theoretical density, and having an internal cavity, providing a densification mandrel having dimensions slightly smaller than the final dimensions to be imparted to said cavity and having a thermal coefficient of expansion greater than that of said body, introducing said densification mandrel into said cavity and heat treating said body and densification mandrel to densify said body and to shrink said body into contact with said mandrel and to impart to said body a set of desired internal dimensions.
Dependencies are inferred from the claim text.