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US 5,034,593 AGranted
Coated welding cups
AssigneeW. R. Grace & Co.-Conn.
InventorsRoy W. Rice, Philip L. Berneburg
Life of this patent
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Abstract
An improved welding cup is made from graphite or ceramic fiber composites, coated with silicon nitride, sialon, boron nitride, or silicon carbide. The cup shows superior resistance to erosion, slagging, and thermal fracture.
Claims17
Welding cup comprising
- (a) a preformed cup consisting essentially of a material selected from the group consisting of:
- (i) carbon,
- (ii) a composite of graphite fibers in a carbon matrix,
- (iii) a composite of ceramic fibers in a carbon matrix,
- (iv) a composite of graphite fibers in a ceramic matrix, and
- (v) a composite of ceramic fibers in a ceramic matrix;
- and
- (b) a coating on said preformed cup selected from the group consisting of silicon nitride, sialon, silicon carbide, boron nitride and mixtures thereof.
5 more elements
Method of making a welding cup comprising
- (a) shaping a cup preform from a material selected from the group consisting of:
- (i) carbon,
- (ii) a composite of graphite fibers in a carbon matrix,
- (iii) a composite of ceramic fibers in a carbon matrix,
- (iv) a composite of graphite fibers in a ceramic matrix, and
- (v) a composite of ceramic fibers in a ceramic matrix;
- and
- (b) coating the cup preform with a material selected from the group consisting of silicon nitride, sialon, silicon carbide, boron nitride and mixtures thereof.
5 more elements
In a process of welding using a metal inert gas welding cup, the improvement comprising using a cup comprising
- (a) a preformed cup consisting essentially of a material selected from the group consisting of:
- (i) carbon,
- (ii) a composite of graphite fibers in a carbon matrix,
- (iii) a composite of ceramic fibers in a carbon matrix,
- (iv) a composite of graphite fibers in a ceramic matrix, and
- (v) a composite of ceramic fibers in a ceramic matrix;
- and
- (b) a coating on said preformed cup selected from the group consisting of silicon nitride, sialon, silicon carbide, boron nitride and mixtures thereof.
5 more elements
Dependencies are inferred from the claim text.