Method of manufacturing an electrical resistance h

专利名称：Method of manufacturing an electrical

resistance heating means

发明人：Joseph Anthony McWilliams,Ali Paybarah申请号：US08/729960申请日：19961015公开号：US05800634A公开日：19980901

摘要：An electrical resistance heating element is made from an electrical resistancematerial having the following composition in weight percent:

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Group A:

aluminium 3-8

yttrium, zirconium, hafnium and/or

0-0.45

< P>one or more rare earth elements

Group B: < P>

chromium 12-30

iron and/or nickel and/or cobalt

balance

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< P>The electrical resistance material is arranged in an atmosphere having a potentialfor oxidation such as to permit oxidation of the constituent(s) from Group A and to inhibitoxidation of the constituents from Group B. The resistance material is then heated in theatmosphere to a temperature in the range from 800° C. to a temperature below itsmelting point so as to oxidize the constituent(s) of Group A at the surface and to form asurface layer consisting essentially of continuous unified oxide of the constituent(s) ofGroup A.

申请人：CERAMASPEED LIMITED

代理人：Ira S. Dorman

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