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 20μm 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.
MORIMURA TOSHIO
SHIRAI KATSUYUKI
ASAKAWA ISAMU
SHOWA DENKO KK
| JPS5669321A | 1981-06-10 | |||
| JPS502637A | 1975-01-11 | |||
| JPS58141338A | 1983-08-22 | |||
| JPS59126772A | 1984-07-21 |