Abstract: A thermal spray powder including cermet particles, each of which contains metal containing at least one selected from the group consisting of cobalt, chrome, and nickel, and tungsten carbide. The ratio of the summed weight of cermet particles having a particle size of 25 ?m or more in the thermal spray powder with respect to the summed weight of the entire cermet particles in the thermal spray powder is 0.5 to 15%. A thermal spray coating formed from the thermal spray powder is suitable for the formation of a tungsten carbide-based cermet thermal spray coating for use in rolls such as corrugated rolls.

Abstract: A thermal spray coating is made of cermet and provided on the surface of a base. The value that is gained by further dividing the value, which is gained by dividing the coefficient of thermal expansion of the thermal spray coating by the thickness of the thermal spray coating (unit: ?m), by the coefficient of thermal expansion of the base is set to a value no less than 0.15×10?2. Accordingly, peeling and cracking of the thermal spray coating can be prevented from being caused by the difference in the coefficient of thermal expansion between the thermal spray coating and the base.

Abstract: A thermal spraying powder contains granulated and sintered particles of an yttrium-aluminum double oxide formed by granulating and sintering raw-material particles. The crushing strength of the granulated and sintered particles is 15 MPa or more, and 10% particle size of the granulated and sintered particles is 6 ?m or more. The thermal spraying powder is suitable for use in forming a thermal spray coating through plasma spraying.

Abstract: A thermal spray powder contains particles composed of an oxide of any of the rare earth elements having an atomic number of 39 or from 59 to 70. The crushing strength of the particles is 80 MPa or greater. The ratio of bulk specific gravity to true specific gravity of the thermal spray powder is 0.15 or greater. The particles are preferably granulated and sintered particles. The average particle size of primary particles constituting the granulated and sintered particles is preferably 6 ?m or less.

Abstract: A thermal spray powder contains granulated and sintered yttria particles and fine yttria particles, the average particle diameter of the fine yttria particles being no more than 1 ?m. The content of the fine yttria particles in the thermal spray powder is 1,000 to 10,000 ppm by mass. It is preferred that the thermal spray powder be used in applications for forming a thermal spray coating by plasma thermal spraying at atmospheric pressure.

Abstract: A thermal spray powder including cermet particles, each of which contains metal containing at least one selected from the group consisting of cobalt, chrome, and nickel, and tungsten carbide. The ratio of the summed weight of cermet particles having a particle size of 25 ?m or more in the thermal spray powder with respect to the summed weight of the entire cermet particles in the thermal spray powder is 0.5 to 15%. A thermal spray coating formed from the thermal spray powder is suitable for the formation of a tungsten carbide-based cermet thermal spray coating for use in rolls such as corrugated rolls.

Abstract: A thermal spray powder contains granulated and sintered particles composed of an oxide of any of the rare earth elements having an atomic number from 60 to 70. The average particle size of the primary particles constituting the granulated and sintered particles is 2 to 10 ?m. The crushing strength of the granulated and sintered particles is 7 to 50 MPa. A plasma resistant member includes a substrate and a thermal spray coating provided on the surface of the substrate. The thermal spray coating is formed by thermal spraying, preferably plasma thermal spraying, the thermal spray powder.

Abstract: A thermal spray powder contains particles composed of an oxide of any of the rare earth elements having an atomic number of 39 or from 59 to 70. The crushing strength of the particles is 80 MPa or greater. The ratio of bulk specific gravity to true specific gravity of the thermal spray powder is 0.15 or greater. The particles are preferably granulated and sintered particles. The average particle size of primary particles constituting the granulated and sintered particles is preferably 6 ?m or less.

Abstract: A thermal spraying powder includes granulated and sintered particles of an yttrium-aluminum double oxide obtained by granulating and sintering a raw powder containing yttrium and aluminum. The total volume of fine pores having a diameter of 6 ?m or less in one gram of the granulated and sintered particles is 0.06 to 0.25 cm3. The thermal spraying powder reliably forms a thermal spray coating that is suitable for use where the thermal spray coating is subjected to a thermal shock in a corrosive atmosphere or an oxidative atmosphere and for use where the thermal spray coating is subjected to a thermal shock in a state where the thermal spray coating contacts a member that has reactivity to a base material.

Abstract: A thermal spray coating is made of cermet and provided on the surface of a base. The value that is gained by further dividing the value, which is gained by dividing the coefficient of thermal expansion of the thermal spray coating by the thickness of the thermal spray coating (unit: ?m), by the coefficient of thermal expansion of the base is set to a value no less than 0.15×10?2. Accordingly, peeling and cracking of the thermal spray coating can be prevented from being caused by the difference in the coefficient of thermal expansion between the thermal spray coating and the base.

Abstract: A thermal spray powder contains granulated and sintered yttria particles and fine yttria particles, the average particle diameter of the fine yttria particles being no more than 1 ?m. The content of the fine yttria particles in the thermal spray powder is 1,000 to 10,000 ppm by mass. It is preferred that the thermal spray powder be used in applications for forming a thermal spray coating by plasma thermal spraying at atmospheric pressure.

Abstract: A thermal spray powder contains granulated and sintered particles which contain yttria and an yttrium-aluminum double oxide. The aluminum content in the granulated and sintered particles is 50 to 10,000 ppm by mass on an alumina basis. It is preferred that the thermal spray powder be used in applications for forming a thermal spray coating by plasma thermal spraying at atmospheric pressure.

Abstract: A thermal spray coating includes yttrium oxide at least as a main component. When the thermal spray coating is exposed to CF4 plasma and the plasma power of the CF4 plasma per unit area applied onto the thermal spray coating is 0.8 W/cm2 or greater, an etching rate by the CF4 plasma of the thermal spray coating satisfies the equation Re?7.7×Pp2.2. Alternatively, when the plasma power of the CF4 plasma per unit area applied onto the thermal spray coating is less than 0.8 W/cm2, an etching rate by the CF4 plasma of the thermal spray coating satisfies the equation Re?8.0×Pp2.2. In the equations, “Re”, represents the etching rate (nm/minute) by the CF4 plasma of the thermal spray coating, and “Pp” represents the plasma power per unit area (W/cm2) applied onto the thermal spray coating.

Abstract: A thermal spray powder includes granulated and sintered yttria particles obtained by granulating and sintering a raw material powder in air or oxygen. The primary particles constituting the granulated and sintered yttria particles have an average particle size between 0.5 and 1.5 ?m inclusive, and 1.11 times or more as large as the raw material powder. Alternatively, the primary particles have an average particle size between 3 and 8 ?m inclusive.

Abstract: A thermal spraying powder includes granulated and sintered particles of an yttrium-aluminum double oxide obtained by granulating and sintering a raw powder containing yttrium and aluminum. The total volume of fine pores having a diameter of 6 ?m or less in one gram of the granulated and sintered particles is 0.06 to 0.25 cm3. The thermal spraying powder reliably forms a thermal spray coating that is suitable for use where the thermal spray coating is subjected to a thermal shock in a corrosive atmosphere or an oxidative atmosphere and for use where the thermal spray coating is subjected to a thermal shock in a state where the thermal spray coating contacts a member that has reactivity to a base material.

Abstract: A thermal spraying powder contains granulated and sintered particles of an yttrium-aluminum double oxide formed by granulating and sintering raw-material particles. The crushing strength of the granulated and sintered particles is 15 MPa or more, and 10% particle size of the granulated and sintered particles is 6 ?m or more. The thermal spraying powder is suitable for use in forming a thermal spray coating through plasma spraying.

Abstract: A thermal spraying powder contains a chromium-iron based alloy powder that includes carbon. The ratio of the mass of carbon in the alloy powder to the total mass of chromium and iron in the alloy powder is 2% or more. 10% particle size D10 of the alloy powder is preferably 10 ?m or more, and more preferably 15 ?m or more. 50% particle size D50 of the alloy powder is preferably 20 ?m or more. The thermal spraying powder is suitable for use in forming a thermal spray coating through high-velocity flame spraying.