Method for increasing the resistance to thermal shocks in heatin

Details Method for increasing the resistance to thermal shocks in heatin Method for increasing the resistance to thermal shocks in heatin

1989-02-09

1990-11-13

Woo, Jay H.

Metal treatment

Process of modifying or maintaining internal physical...

Processes of coating utilizing a reactive composition which...

148286, 148287, 502439, B01J 2378, B23P 1700, C23C 802, C23C 810

Patent

active

049699601

ABSTRACT:
A method for increasing the resistance to thermal shocks of the oxide layer of metallic heat conductive materials which contain 3% to 10% aluminum, 10% to 26% chromium, up to 3% zirconium and/or titanium and/or hafnium and/or niobium and/or silicon and/or 0.002% to 0.3% total of rare earths and/or yttrium in metallic form or as finely dispersed oxides, the remainder being iron and/or nickel and/or cobalt as well as the trace elements normally present in steels. The materials develop primarily aluminum oxide and/or chromium oxide on the surface when heated in a temperature range of 700.degree. C. to 1350.degree. C. in an oxygen-containing atmosphere. The materials are first heated in an oxygen-free atmosphere under conditions which cause recrystallization in their surface zone. They then are oxidized in an atmosphere which contains oxygen in chemically bound form.

REFERENCES:
patent: 4318828 (1982-03-01), Chapman
patent: 4915751 (1990-04-01), Vaneman
Stahl-Eisen-Liste, Verlag Stahleisen m.b.H., Dusseldorf, 1977, Dr.-Ing. Hans Schmitz.

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