Hearth roll with superior endurance capacity
AssigneePraxair S.T. Technology, Inc.
InventorYang Gao
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Abstract
A hearth roll with a cermet thermal spray coating on the roll surface which is composed of a heat resistant MCrA1Y (M: Fe, Ni, Co) alloy where the amount of A1 is below 10 at. % and the combined (Al+Cr) amount is between 13-31 at. % and at least one oxide ceramic from the group consisting of MgO, MgAl.sub.2 O.sub.4, and Y.sub.2 O.sub.3.
Claims5
A continuous annealing furnace for annealing sheet strips which employs a hearth roll characterized by a cermet thermal spray layer on the surface of the roll body where the thermal spray layer is composed of (1) a heat resistant MCrAlY alloy where M is at least one metallic element from the group of Fe, Ni, and Co, with the amount of Al to be below 10 at. % and the combined amount of Al and Cr between 13 at. % and 31 at. % combined with (2) an oxide ceramic constituting between 5-90 wt. % of the thermal spray coating which has low reactivity with manganese oxide.
Dependencies are inferred from the claim text.