| (19) |
 |
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(11) |
EP 0 147 011 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
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26.03.1986 Bulletin 1986/13 |
| (43) |
Date of publication A2: |
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03.07.1985 Bulletin 1985/27 |
| (22) |
Date of filing: 17.09.1984 |
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| (84) |
Designated Contracting States: |
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BE DE FR GB IT LU NL SE |
| (30) |
Priority: |
28.12.1983 US 566288
|
| (71) |
Applicant: HEATBATH CORPORATION |
|
() |
|
| (72) |
Inventors: |
|
- Jones, William C.
()
- Britt, Kenneth R.
()
- Newell, Isaac L.
()
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| |
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| (54) |
A non-cyanide salt bath and process for carburization of ferrous metals and alloys |
(57) A non-cyanide molten salt bath composition for the . carburization of objects made
of ferrous metals or alloys at a temperature in the range of 900-1050°C comprises:
(a) 85-99% of an alkali metal chloride or a mixture of alkali metal chlorides;
(b) 0.25-8% of an activator, which is an oxygen containing compound barium and/or
strontium compound and
(c) sufficient amount of finely divided graphite to provide a continuous cover on
the surface of the molten salt mixture. The ferrous metal or alloy part is immersed
in the molten mixture at a temperature jn the range of 900°C to 1050°C.