ROLL HAVING CORROSION RESISTANCE TO MOLTEN METAL

摘要

PURPOSE:To fill even micropores and microcracks in a roll with a pore sealing agent by subjecting the roll to pore sealing treatment with a product obtd. by hydrolyzing and condensing tetraalkoxysilane and trialkoxysilane. CONSTITUTION:Pores and cracks in a thermally sprayed ceramic layer are sealed with a product obtd. by cohydrolyzing and condensing Si(OR<1>)4 and R<2> Si(OR<3>)3 under selected synthesis conditions of the amt. of water added, temp., a catalyst, etc. Corrosion resistance to a molten metal can be imparted to a roll thermally sprayed with ceramics by subjecting the roll to pore sealing treatment.