Masked metal diffusion

Details Masked metal diffusion Masked metal diffusion

1984-02-28

1989-07-04

Jacobs, Lewis T.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

524403, 524406, 524408, 524413, 524430, 524435, 524439, 524440, 427250, 427252, 427253, 427383D, 4273839, C08L 308

Patent

active

048451398

ABSTRACT:
Very good masking of pack diffusion aluminizing on any metal to keep portions from being diffusion coated, is effected by localized coating layers the lowest of which is inert or depletion-reducing masking powder that can have same composition as substrates, mixed with non-contaminating film-former such as acrylic resin. The upper coating layer or layers can be of non-contaminating particles like nickel or Cr.sub.2 O.sub.3 that upon aluminizing or chromizing become coherently held together to form a secure sheath. Such sheath can also be used for holding localized diffusion-coating layer in place. Film-former can be dissolved in volatile solvent, preferably methyl chloroform, in which masking powder or sheath-forming powder is suspended. Chromizing can be performed before aluminizing for greater effects.

REFERENCES:
patent: 3692731 (1972-09-01), McAdow
patent: 3759852 (1973-09-01), Bradley
patent: 3884705 (1975-05-01), Blair
patent: 3904555 (1975-09-01), Matsuda et al.
patent: 4128522 (1978-12-01), Elam
patent: 4464430 (1984-08-01), Baldi

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