Metal treatment – Compositions – Heat treating
Patent
1986-10-22
1988-05-24
Rosenberg, Peter D.
Metal treatment
Compositions
Heat treating
148 166, B23K 3524
Patent
active
047463767
ABSTRACT:
A method and composition for stopping-off nitrogen and/or carbon diffusion into metal surfaces. The composition, which is a mixture of a refractory material selected from the group of zirconium and aluminosilicate, sodium silicofluoride and sodium silicate, is coated onto the metal surface where diffusion is to be prevented. The mixture is cured and the metal part is subjected to elevated temperatures for carburizing, nitriding, or carbonitriding. The coating prevents nitrogen and/or carbon diffusion at the coated area. After treatment the coating is removed.
REFERENCES:
patent: 2641556 (1953-06-01), Robinson
patent: 3945862 (1976-03-01), Lee
Hogg William N.
Kolene Corporation
Rosenberg Peter D.
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