Surface hardening method

Details Surface hardening method Surface hardening method

1977-12-16

1980-04-01

Kendall, Ralph S.

Metal treatment

Compositions

Heat treating

427250, 4272481, C23C 902, C23C 904

Patent

active

041960220

ABSTRACT:
A method of surface hardening a substrate made of an inorganic material by diffusing a different inorganic material into the substrate is disclosed wherein the diffusion is effected in an alkali metal gas atmosphere. The substrate may be made of titanium, zirconium, iron, yttrium, tungsten, tantalum or a material containing one of those elements as a principle component. The diffusion material may be boron, silicon or a material containing one of those elements. The alkali metal gas atmosphere is produced by heating metallic sodium, potassium, lithium or a combination thereof. The surface hardened substrate produced according to the method exhibits an increased Young's modulus of elasticity, hardness and mechanical strength and is particularly suitable in the manufacture of electro-acoustic diaphragms as well as other light weight, high mechanical strength articles.

REFERENCES:
patent: 1306568 (1919-06-01), Weintraub
patent: 2854353 (1958-09-01), Schwope
patent: 2858600 (1958-11-01), Vigor
patent: 3051587 (1962-08-01), Coburn
patent: 3058841 (1962-10-01), Drosten et al.
patent: 3211572 (1965-10-01), Globus
patent: 3321337 (1967-05-01), Patterson
vanArkel, Mettalwirtschaft, 13, 405-408 (1934).
Powell et al., Vapor-Plating, John Wiley & Sons 1955, pp. 46-52, 60-70.

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