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US 5,161,306 AGranted
Roll for use in heat treating furnace and method of producing the same
AssigneeTocalo Co., Ltd.
InventorsAkira Nakahira, Yoshio Harada, Noriyuki Mifune
Life of this patent
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Abstract
In order to prevent production of build-up resistance and wear resistance on a roll for use in heat treating furnace effectively, an alloy layer, a cermet sprayed layer having reinforced zone and a chemical conversion coating are provide in this order on a roll substrate to form a multi-coating layer.
Claims5
A method of manufacturing a roll for use in heat treating furnace which comprises the steps of:
- (1) forming a spray-coated alloy layer by thermo-spraying a heat resistant alloy powder on a roll substrate;
- (2) forming a cermet spray-coated layer having non-metallic reinforced materials dispersed therein by thermo-spraying on the alloy spray-coated layer a mixture of the heat resistant alloy powder and particles of carbide or a composite of carbide particles and oxide particles;
- and
- (3) forming a chemical conversion coating layer by applying metal oxide solution onto the cermet spray-coated layer and then heating, while a part of the metal oxide separated by heating is impregnated into micropores formed in the upper portion of the cermet spray-coated layer to form a cermet sprayed-reinforced zone therein.
1 more element
Dependencies are inferred from the claim text.