| 摘要 |
PURPOSE:To provide the thermal spraying material by incorporating a powdered oxidation resisting alloy and metal boride grains and specifying the content of the metal boride grains in a thermal spraying material used mainly for conveyance rolls for a high temp. material to be heat treated in a continuous heat treatment furnace. CONSTITUTION:This thermal spraying material is a composite powder or a powder mixture consisting of an alloy powder and metal boride grains and is composed of a cermet having a composition which contains 5-50vol.% metal boride grains and in which the alloy powder consists of, by weight, 15-40% Cr, 5-20% Al, and the balance one or more elements among Ni, Co, and iron. By thermally spraying this thermal spraying material, a thermally sprayed layer excellent in all the characteristics of build-up resistance, adhesive strength, thermal shock resistance, and wear resistance can be obtained. Wear resistance and build-up resistance are deteriorated when the content of the metal boride is below the lower limit, and, when it exceeds the upper limit, impact resistance, adhesive strength, and thermal shock resistance are deteriorated. |
