| 摘要 |
PURPOSE:To prepare a hearth roll for a heat treating furnace prevented from scale adhesion, by coating the peripheral surface of the barrel part of the hearth roll with a composite material formed of a TiC or Cr3C2 powder and an alloy powder based on Ni or Co. CONSTITUTION:In a hearth roll 1 consisting of a shaft part 1a and a barrel part 1b, the peripheral surface of the barrel part 1b is subjected to air blast treatment and a film 2, which consists of an under coat 2a comprising a Ni-Cr alloy and a top coat 2b comprising a composite material excellent in heat resistance based on TiC or Cr3C2 and Ni or Co, is formed to the treated barrel part 1b. T The above mentioned composite material is formed by a method wherein a fine TiC or Cr3C2 powder with a particle size of 20mum or less and a fine alloy powder based on Ni or Co with the same particle size are granulated to form a composite powder which is, in turn, plasma sprayed. By this method, a hearth roll for a heat treating furnace, which can be prevented from scale adhesion and is excellent in wear resistance and thermal impact resistance, is obtained. |
