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US 5,070,587 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 roll for use in a heat treating furnace having a multi-layer construction comprising:
- a roll substrate;
- a coating layer formed on the roll substrate comprising an alloy spray-coated layer formed by thermo-spraying a heat resistant alloy on the roll substrate;
- a cermet spray-coated layer formed by thermo-spraying on the alloy spray-coated layer a cermet consisting of a heat resistant alloy as a matrix and containing carbide particles or a mixture of carbide and oxide particles which are dispersed in the matrix;
- a chemical conversion coating layer formed by coating on the cermet spray-coated layer a metal oxide which is formed by a chemical densifying treatment for thermally decomposing metal oxide solution coatings;
- and a cermet reinforcement spray-coated zone formed by impregnating a metal oxide separated out on the cermet sprayed layer by the chemical conversion treatment.
2 more elements
Dependencies are inferred from the claim text.