HIGHLY CORROSION-RESISTANT AND WEARING-RESISTANT MEMBER WITH THERMAL-SPRAYING DEPOSIT AND POWDER FOR THERMAL-SPRAYING DEPOSIT FORMATION FOR FORMING THE SAME

摘要

A corrosion-resistant and wearing-resistant member is provided which comprises a metallic member and a thermal-spraying deposit having corrosion resistance and wearing resistance formed on that surface of the metallic member which is to be in contact with a resin generating a highly corrosive gas. Also provided is a thermal-spraying powder. The highly corrosion-resistant and wearing-resistant member having a thermal-spraying deposit is one obtained by subjecting a metal powder to thermal spraying on a metallic base to form a thermal-spraying deposit on a surface of the metallic base. The member is characterized in that the thermal-spraying deposit is a composite boride cermet of a tetragonal Mo2(Ni,Cr)B2 type or tetragonal Mo2(Ni,Cr,V)B2 type. The powder for forming a thermal-spraying deposit is made of a composite boride cermet of a tetragonal Mo2(Ni,Cr)B2 type and comprises 4.0-6.5 mass% boron, 39.0-64.0 mass% molybdenum, and 7.5-20.0 mass% chromium, the remainder being at least 5 mass% nickel and incidental elements.