Tocalo Co., Ltd.

Fujimi Incorporated

Nippon Steel & Sumitomo Metal Corporation

Ihi Corporation

Nippon Steel Corporation

Tatsuo Suidzu

Hiroaki Mizuno

Noriyuki Yasuo

Yoshio Harada

Yasushi Kurisu

Takaya Masuda

Takeshi Takabatake

Hiroki Yokota

Tatsuya Kuno

Koki Hamada

Naoki Sato

Daisuke Kawai

Nobuhiko Kubota

Isao Aoki

Tatsuya Fukushi

Satoshi Tawada

Sho Hashimoto

Yakema Teratani

Kazuhiro Takeuchi

Masakazu Okazaki

A coating is formed on a surface of a base material of a furnace, and includes a base layer and a sliding material layer that is formed on a surface of the base layer and contains an oxide ceramic and a compound having a layered crystal structure. The sliding material layer causes the collided ashes to be slipped and facilitates the drop off of the adhered ashes. The base material forms a heat transfer tube or a wall surface of the furnace. The coating is also applied to a coal gasification furnace, a pulverized coal fired boiler, a combustion apparatus, or a reaction apparatus containing a furnace.

Coating and method for forming the same

A ceramic substrate is irradiated in an atmospheric air with a laser having a power density of 1.0&#xd7;10-1.0&#xd7;10W/cmfor an action time on an irradiation area of 1.0&#xd7;10-1.0&#xd7;10s to roughen a surface of the ceramic substrate, as well as to form an oxide layer on a roughened surface. A thermal sprayed coating formed on the ceramic substrate sufficiently adheres to the ceramic substrate via the oxide layer.

Method for roughening surface of substrate, method for treating surface of substrate, method for producing thermal spray-coated member, and thermal spray-coated member

A method for producing a surface-modified component includes: a process of forming a thermal sprayed coating on a substrate; a process of irradiating a surface of the thermal sprayed coating with a high energy beam so as to cause an entirety of the thermal sprayed coating and a part of the substrate in a thickness direction to melt and then solidify, and thereby forming a densified modified layer; a process of forming a thermal sprayed coating on the modified layer which has been formed in the latest; and a process of irradiating a surface of the thermal sprayed coating with a high energy beam so as to cause an entirety of the thermal sprayed coating and a part of the modified layer which has been formed in the latest in the thickness direction to melt and then solidify, and thereby forming a densified modified layer.

Method for producing surface-modified component

A thermal spray powder is provided that contains, as constituent elements, a first element selected from W and Mo; a second element selected from Co, Ni, and Fe; a third element selected from C and B; and a fourth element formed of Si. The amount of the second element in the thermal spray powder is 40% by mole or less. The mole ratio of the fourth element to the second element in the thermal spray powder is 0.002 or greater and 0.03 or less. The thermal spray powder has a crystal phase containing Co, Ni, or Fe; W; and C or a crystal phase containing Co, Ni, or Fe; W or Mo; and B. In an X-ray diffraction spectrum of the thermal spray powder, the peak intensity attributed to Co, Ni, or Fe is at most 0.1 times the largest peak intensity in the same X-ray diffraction spectrum.

Powder for thermal spray, thermal spray coating film, coating film and roll in molten metal bath

A thermal spray powder is provided that contains, as constituent elements, a first element selected from W and Mo; a second element selected from Co, Ni, and Fe; a third element selected from C and B; and a fourth element selected from Al and Mg. The amount of the second element in the thermal spray powder is 20% by mole or greater. The mole ratio of the fourth element to the second element in the thermal spray powder is 0.05 or greater and 0.5 or less. The thermal spray powder has a crystal phase containing Co, Ni, or Fe; W; and C or a crystal phase containing Co, Ni, or Fe; W or Mo; and B. In an X-ray diffraction spectrum of the thermal spray powder, the peak intensity attributed to Co, Ni, or Fe is at most 0.1 times the largest peak intensity in the same X-ray diffraction spectrum.

A hearth roll includes a base roll, a thermally sprayed coating formed on the base roll, and a modified coating formed on the thermally sprayed coating. The modified coating is formed by modifying a part or the whole of a surface of the thermally sprayed coating by melting and solidification of the thermally sprayed coating, by irradiating a part or the whole of the surface of the thermally sprayed coating with an energy beam. The thickness of the modified coating is from 2 to 20 &#x3bc;m, and the Vickers hardness HV of the modified coating is from 1.2 to 1.4 times larger than the Vickers hardness HV of the thermally sprayed coating.

Hearth roll and manufacturing method therefor

The hearth roll for a continuous annealing furnace is able to suppress the occurrence of buildup on the hearth roll surface and able to be stably used for a long period under the high temperature environment. The hearth roll has a cermet coating comprised 50 to 90 vol % of ceramic and the balance of a heat resistant alloy on its surface, the ceramic containing CrC: over 50 to 90 vol %, AlO: 1 to 40 vol %, YO: 0 to 3 vol %, and ZrB: 0 to 40 vol % and having a balance of unavoidable impurities and pores, the heat resistant alloy containing Cr: 5 to 20 mass %, Al: 5 to 20 mass %, and one or both of Y and Si: 0.1 to 6 mass % and has a balance of one or both of Co and Ni and unavoidable impurities.

Hearth roll in a continuous annealing furnace and its production method

A thermal spraying powder contains 30 to 50% by mass of chromium carbide with the remainder being an alloy containing chromium, aluminum, yttrium, and at least one of cobalt and nickel. The thermal spraying powder has an average particle size of 20 to 60 &#x3bc;m. The thermal spraying powder may contain 20% by mass or less of yttrium oxide in place of a part of the alloy. A thermal spray coating obtained by thermal spraying of the thermal spraying powder, particularly, a thermal spray coating obtained by high-velocity flame spraying of the thermal spraying powder is suitable for the purpose of a hearth roll.

Thermal spraying powder comprising chromium carbide and alloy containing cobalt or nickel, thermal spray coating, and hearth roll

A coating material for a thermal barrier coating having excellent corrosion resistance and heat resistance comprises a substrate, an undercoat made of an aluminum-containing heat-resistant alloy, CrOlayer as a middle layer on the undercoat, and a top coat made of ZrObased ceramic on the middle coat.

Coating material for thermal barrier coating having excellent corrosion resistance and heat resistance and method of producing the same

A high-temperature strength member comprises a substrate of Ni-based single crystal alloy or a Ni-based unidirectional solidified alloy and a coating of a B-containing alloy having a specified B content formed on the surface thereof by a spraying process or a vapor deposition process.

Growing community of inventors

Akashi, Japan

Tatsuo Suidzu