Chemical milling of high tungsten content superalloys

Details Chemical milling of high tungsten content superalloys Chemical milling of high tungsten content superalloys

1983-10-11

1985-02-05

Kimlin, Edward

Adhesive bonding and miscellaneous chemical manufacture

Delaminating processes adapted for specified product

Delaminating in preparation for post processing recycling step

156639, 156640, 156651, 1566591, 252 793, C23F 100, C09K 1308

Patent

active

RE0318230

ABSTRACT:
Chemical milling of cast superalloys having high tungsten contents is advantageously accomplished with an etchant which consists by volume percent of 40-60 concentrated HNO.sub.3, 0.6-0.8 concentrated HF, [30]40-70 H.sub.2 O, with which is included at least 0.008 moles/liter CuSO.sub.4 and 0.0016-0.025 moles/liter FeCl.sub.3. Preferably the molar ratio of CuSO.sub.4 to FeCl.sub.3 is 2:1 and etching is accomplished in the range 50.degree.-80.degree. C.

REFERENCES:
patent: 2916458 (1959-12-01), McFarland
patent: 2940837 (1960-06-01), Acker et al.
patent: 3052582 (1962-09-01), Snyder
patent: 3057765 (1962-10-01), LaBoda et al.
patent: 3622391 (1971-11-01), Baldi
patent: 4274908 (1981-06-01), Fishter et al.
patent: 4284468 (1981-08-01), Stearns

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