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US 4,539,053 AGranted
Pack composition for carburosiliconizing ferrous substrates
AssigneeDresser Industries, Inc.
InventorWilliam L. Aves, Jr.
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Abstract
A pack composition is disclosed for case hardening a ferrous metal to initially diffuse boron into the surface thereof and subsequently diffuse boron and silicon into the surface thereof. The pack composition comprises an amorphous boron, a silicon material, an alkyli earth, and a carbon bearing compound with the last named compound including a barium carbonate, a calcium carbonate and a hardwood charcoal and coke mixture.
Claims5
A pack composition for treating a ferrous metal to initially diffuse carbon into the surface thereof and subsequently diffuse boron and silicon consisting essentially of:
- (a) between about 5% and 20% by weight amorphous boron;
- (b) between about 2% and 10% by weight silicon material;
- (c) between about 2% and 15% by weight alkali earth;
- and
- (d) between about 70% and 90% by weight carbon bearing compound, said carbon bearing compound consisting essentially of
- (1) between about 5% and 45% by weight barium carbonate;
- (2) between about 5% and 20% weight calcium carbonate;
- (3) between about 50% and 90% by weight hardwood charcoal and coke mixture, said hardwood charcoal and coke mixture comprising:
- (i) between about 70% and 90% by weight hardwood charcoal;
- and
- (ii) between about 5% and 20% by weight coke.
8 more elements
Dependencies are inferred from the claim text.