MANUFACTURE OF FURNACE METAL MEMBER FOR METAL AND CERAMIC PRODUCT MANUFACTURING FURNACE

摘要

This invention relates to components of ceramic kiln and furnace hardware made of NICRALY alloys.PPDisclosed is a method of heat treating NICRALY alloys to obtain a uniform film of desired alumina (Al.sub.2 O.sub.3) on the surface of the alloys. The gist of the invention resides in the control of the critical relationship between the temperature and the partial pressure of oxygen in the oxygen potential controlled atmosphere during the heat treatment. Optimum results are obtained when the temperature is about 2100° F. and the dew point is about -30° F. in hydrogen for about one hour.