Chemical milling of high tungsten content superalloys
US4353780A · kind A · utility
14Cited by
7References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 1, 1980 |
| Grant date | Oct 12, 1982 |
| Priority date | — |
| Expiry date | Oct 1, 2000 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23F1/28
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
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, 30-70 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.