Abstract: The hearth roll includes a thermally sprayed coating formed on the surface thereof. The thermally sprayed coating includes a nitride, an oxide, or a multiple oxide, and a matrix material composed of one or two or more metals. In the hearth roll having high Mn build-up resistance, the following expressions are satisfied: 3% by volume?X1?50% by volume; 3% by volume?X2?50% by volume; and 40% by volume?X1+X2?80% by volume, in which X1 is the percentage by volume of the nitride contained in the thermally sprayed coating with respect to the total volume (10% by volume) of the thermally sprayed coating, and X2 is the percentage by volume of the oxide or the multiple oxide contained in the thermally sprayed coating with respect to the total volume of the thermally sprayed coating.

Abstract: A long-life hearth roll having excellent build-up resistance against Mn-based substances, and which has excellent thermal shock resistance and abrasion resistance is provided. The thermal spray material that is thermally sprayed onto a surface of the hearth roll is characterized by including a heat resistant metal (including an alloy) that includes Al and can be used at 900° C. or more, and a complex oxide of one kind or two kinds or more of a rare earth element (Sc, Y, lanthanum, and lanthanoids) and a transition metal excluding group 3A of the periodic table, Zr, Hf, and Fe, wherein when an Al content is A (moles), and a rare earth element (Sc, Y, lanthanum, and lanthanoids) content is B (moles), the thermal spray material satisfies a condition of 0.3?(A/B)?4.0.

Abstract: Disclosed is a hearth roll having excellent build-up resistance against an Mn-containing substance, excellent thermal shock resistance, excellent wear resistance and a long lifetime. Specifically disclosed is a thermal spraying material to be thermally sprayed on the surface of a hearth roll. The thermal spraying material comprises: a heat-resistant metal (including an alloy) which contains Al and can be used at a temperature equal to or higher than 900° C.; and a multiple oxide of at least one metal selected from rare earth elements (Sc, Y, lanthanum and lanthanoid), metals belonging to Group 3A on the periodic table and transition metals excluding Zr, Hf and Fe, wherein the content of Al (A) (mole) and the content of the rare earth clement (Sc, Y, lanthanum and lanthanoid) (B) (mole) fulfill the requirement represented by the following formula: 0.3?(A/B)?4.0.

Abstract: A roller (1) for forming noodles and the like (W) comprises a roller body (2), an intermediate layer (4) and a fluoropolymer layer (3). The intermediate layer (4) is formed from a thermally sprayed material with open cells such as a ceramic. The open cells of the intermediate layer (4) permit intrusion of fluoropolymer therein. The intermediate layer (4) binds the surface of the roller body (2) with the fluoropolymer layer (3).

Abstract: A member having a coating film is formed by thermal spraying a thermal spray material. The thermal spray material includes a double oxide forming a monophasic oxide, and contains (a) at least one trivalent metal element selected from the group consisting of Al, Ti, V, Cr, Co, Rh, and Sc, Y and lanthanoid in rare earth elements, and (b) at least one element selected from the group consisting of Sc, Y, and lanthanoid in the rare earth elements different from those in (a).

Abstract: In a method for manufacturing a member for use in a molten metal bath, a sealing solution is applied on a coating formed of oxide system ceramics formed on an outermost surface of a substrate. The sealing solution includes an inorganic colloid compound solution containing an inorganic colloid having a grain diameter in a range of 5-50 nanometers in an amount of 5-50 weight percent, and an inorganic binder. The inorganic binder is mixed at a weight ratio of 0.3-3.0 with respect to a weight of 1.0 of the inorganic colloid. The oxide system ceramic formed on the outermost surface of the substrate is an oxide containing 5% or more of a composite oxide comprising (a) at least one of Al, Ti, V, Cr, Fe, Co, Rh, In and rare earths, which are trivalent metal elements, and (b) at least one rare earth different from that used in (a). The sealing solution on the coating after permeation is then baked.

Abstract: A member for a molten metal bath is provided with a composite sprayed coating having excellent corrosion resistance and peeling resistance against a molten metal. A cermet sprayed coating lower layer including 5-60% by weight of metal boride and 5-30% by weight of at least one member selected from the group consisting of Co, Cr, Mo, and W with the balance including metal carbide and unavoidable impurities is formed on a surface of a member for the molten metal bath such as a roll in a bath, and an oxide ceramic sprayed coating surface layer including combined various oxides is formed on the cermet coating. The obtained composite coating is subjected to sealing treatment by means of an inorganic sealing agent.

Abstract: An equipment for use in a molten metal plating bath, comprising a bearing disposed in the molten metal plating bath for supporting a roller with an end, the bearing containing 70-95 wt. % of Si.sub.3 N.sub.4, 2-10 wt. % of Al.sub.2 O.sub.3, 1-10 wt. % of AIN and 1-10 wt. % of Y.sub.2 O.sub.3 and having a concave with a rectangular shape in section, the end of the roller being directly disposed in the concave to be supported by the bearing without using rollers.

Abstract: A spray deposit is formed by applying a spray deposit on a target object, and applying a sealer onto the spray deposit on the target object immediately after the spray deposit is applied on the target object. Thus, a thin layer of sealer components contained in the sealer is formed immediately on the spray deposit while a liquid component of the sealer volatilizes.

Abstract: A roll of a winding equipment in a rolling factory is formed of a roll body, a hardened buildup substrate formed on a surface of the roll body, and a carbide-particle-dispersed-type autogenous-alloy-sprayed layer having a thickness of at least 0.5 mm and formed on the substrate. The autogenous-alloy-sprayed layer contains 3-60% by weight of carbide particles or complex carbide particles. The carbide particles or complex carbide particles have a particulate shape or a leaf shape with a size of 3-300 .mu.m. The roll can exhibit good abrasion resistance and plate flaw resistance, and good conveyance property for a passing plate material.

Abstract: A manufacturing method for immersion members for molten metal baths, wherein a thermal sprayed coating including 1-50 wt % of tungsten boride, 3-25 wt % of one or more of Ni, Co, Cr, and Mo as a metal phase, and a remainder including tungsten carbide, is formed on the surface of a immersion member for use in molten metal baths, and subsequently, impregnation processing is conducted with respect to the thermal sprayed coating in a processing fluid having as a main component thereof chromic acid (H.sub.2 CrO.sub.4 and H.sub.2 Cr.sub.2 O.sub.7), and subsequently, baking processing is conducted. In accordance with this manufacturing method, a surface layer possessing fine microstructure and high bond strength not conventionally available is provided, and it is possible to manufacture a superior immersion member for use in molten metal baths which has superior resistance to corrosion, resistance to corrosive peeling, and resistance to abrasion, and to which metals do not easily adhere.

Abstract: A flame-sprayed layer comprising 1.0 to 1.5% by weight of C, 2.0 to 4.0% by weight of B, 2.0 to 4.0% by weight of Si, 1.0 to 6.0% by weight of Fe, 10.0 to 16.0% by weight of W, 5.0 to 21.0% by weight of Cr and 10.0 to 15.0% by weight of Ni, with the balance being Co, is formed on the surface of an immersion member for a hot dip galvanizing bath. This surface layer has improved corrosion resistance and abrasion resistance and an excellent peeling resistance (adhesion), and the life of the immersion member is prolonged and a galvanization product having a uniform quality and having no flaws can be prepared by using an immersion member having this flame-sprayed surface layer. These effects are enhanced when the formed flame-sprayed layer is heated at a temperature-elevating rate of 10.degree. to 100.degree. C./hr and maintained at a pre-heating temperature of 300.degree. to 600.degree. C. for at least 0.5 hour, the fusing treatment is conducted at a temperature of at least 1000.degree. C.