Surface-boronized pieces

Details Surface-boronized pieces Surface-boronized pieces

1981-05-08

1983-09-13

Lewis, Michael L.

Metal treatment

Compositions

Heat treating

428215, 428469, C23C 900

Patent

active

044040458

ABSTRACT:
The invention relates to a process and apparatus for boronizing pieces made of metal or cermet and to surface-boronized pieces. The pieces are placed in a chamber at between 850.degree. and 1,150.degree. C. and they are subjected, in the presence of boron carbide, to a gaseous stream of trifluoroboroxole (BOF).sub.3. The boron carbide is advantageously pulverulent and out of contact with the pieces to be boronized.

REFERENCES:
patent: 2801187 (1957-07-01), Galmiche
patent: 2816048 (1957-12-01), Galmiche
patent: 3622402 (1971-11-01), Baranow et al.
patent: 3673005 (1972-06-01), Kunst
patent: 3806374 (1974-04-01), Krzyminski
patent: 3936327 (1976-02-01), Fichtl et al.
patent: 4188242 (1980-02-01), Scales
Zhunkovskii, G. L., et al., "Boronizing of Cobalt and Some Cobalt Base Alloys"; Translated From Poroshkovaya Metallurgiya, vol. 119, pp. 33-35, (1972).
Knotek, O., et al.; "Surface Layers on Cobalt Base Alloys by Boron Diffusion", Thin Solid Films, vol. 45, pp. 331-339, (1977).
Fichtl, W.; "Boronizing and its Practical Applications"; Rev. Int. Hautes Temper Retract., Fr.; vol. 17 pp. 33-35, (1980).
Von Matuschka, A. Graf,; Borieren, Carl Hanser Verlag, Munchen Wien, pp. 1-19.

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