PRODUCTION OF HEAT INSULATING METALLIC MEMBER

摘要

PURPOSE:To produce a heat insulating metallic member having a heat insulating and water resistant coating layer without cracking and exfoliation by sticking refractory heat insulating material powder to the inside surface of the metallic member and subjecting the powder to a heat treatment, then sticking protective material powder thereon and subjecting the same to a heat treatment. CONSTITUTION:An inorg. binder soln. of sodium silicate, etc. is coated on the inside surface of the metallic member and immediately thereafter, about 10-500mum powder of the refractory heat insulating material such as SHIRASU balloon is stuck onto said soln. layer and is dried and solidified by the heat treatment to heat gradually the same up to about 300 deg.C. The inorg. binder soln. is then coated on the surface of the refractory heat insulating layer and about <=20mum powder of the protective material such as zirconia is stuck on such soln. layer and is dried and solidified by the heat treatment. The above- mentioned stage is executed at least once to form the protective layer to preferably about <=0.5mm. The member formed with the coating layer consisting of the above-mentioned tow layers is heat-treated at about 800-1,000 deg.C by which the heat insulating metallic member is obtd.