The metal ceramic powder with a particle size of 15-45 .Math.m and suitable for thermal spraying is prepared through a combination of mechanical ball milling, spray granulation, and vacuum sintering. The metal ceramic powder is sprayed on a surface of a steel substrate adopting the high velocity oxygen fuel (HVOF) technology with oxygen-propane as fuel and taking oxygen as a combustion improver, propane as fuel, nitrogen as powder feeding carrier gas, and air as a cooling medium to prepare and form the NiCrBSi—ZrB2 composite coating. The present disclosure solves the problem that ZrB.sub.2 ceramic is difficult to compact during sintering and improves powder bonding strength and fluidity. The preparation method is simple, has advantages of high coating deposition efficiency and convenient equipment operation, and is cost-effective. The preparation method can improve thermal corrosion resistance and high-temperature wear resistance of a surface of boiler, and prolonging lifetime of the boiler.

A powder feed assembly comprises a powder hopper, a motor, an auger housing, an auger, a porous gas-permeable powder filter, a carrier gas inlet, an auger sleeve, and a powder hose. The auger housing receives a powder from the opening in the hopper floor into a powder chamber defined in the auger housing. The auger is selectively rotatable to propel the powder from the powder chamber past the distal end of the auger and into the auger sleeve. The carrier gas inlet introduces carrier gas into an inner chamber of the auger housing. The wall of the auger sleeve allows at least some of the carrier gas to flow or permeate into the internal bore of the auger sleeve to pick up and carry the propelled powder out of the auger housing. The powder hose directs the carrier gas and carried powder from the auger housing to a powder dispenser.

A powder feed assembly comprises a powder hopper, a motor, an auger housing, an auger, a porous gas-permeable powder filter, a carrier gas inlet, an auger sleeve, and a powder hose. The auger housing receives a powder from the opening in the hopper floor into a powder chamber defined in the auger housing. The auger is selectively rotatable to propel the powder from the powder chamber past the distal end of the auger and into the auger sleeve. The carrier gas inlet introduces carrier gas into an inner chamber of the auger housing. The wall of the auger sleeve allows at least some of the carrier gas to flow or permeate into the internal bore of the auger sleeve to pick up and carry the propelled powder out of the auger housing. The powder hose directs the carrier gas and carried powder from the auger housing to a powder dispenser.

A propeller blade comprises a fibre reinforced blade structure spar having a blade retention section formed at one end thereof, and at least one metallic formation spray deposited onto said blade retention section.

A propeller blade comprises a fibre reinforced blade structure spar having a blade retention section formed at one end thereof, and at least one metallic formation spray deposited onto said blade retention section.

A nozzle for a thermal spray gun and a method of thermal spraying are disclosed. The nozzle has a combustion chamber within which fuel is burned to produce a stream of combustion gases. The streams of heated gases exit through a pair of linear exhausts which are located on either side of an aerospike. The streams converge outside the nozzle and powdered coating material is introduced into the converging streams immediately downstream of the aerospike. The coating material is heated and accelerated before impacting on a substrate to be coated.

A nozzle for a thermal spray gun and a method of thermal spraying are disclosed. The nozzle has a combustion chamber within which fuel is burned to produce a stream of combustion gases. The streams of heated gases exit through a pair of linear exhausts which are located on either side of an aerospike. The streams converge outside the nozzle and powdered coating material is introduced into the converging streams immediately downstream of the aerospike. The coating material is heated and accelerated before impacting on a substrate to be coated.

A high durability roller, a manufacturing method thereof and a power transmission device with the high durability roller are provided. The roller for a power transmission device that comprises a plurality of rollers in contact with each other directly or with lubricant between them, includes: a metal base having a Young's modulus of 220 GPa or less; and a coating that is formed on a surface of the metal base, includes hard particles and a metal component composed of at least either simple metal or alloy, and has a Young's modulus of 250 GPa or more. The power transmission device includes the roller. The method of manufacturing the roller includes: forming the coating on the surface of the metal base by thermal spraying using a thermal spray material that comprises the hard particles and the metal component composed of at least either simple metal or alloy.

A high durability roller, a manufacturing method thereof and a power transmission device with the high durability roller are provided. The roller for a power transmission device that comprises a plurality of rollers in contact with each other directly or with lubricant between them, includes: a metal base having a Young's modulus of 220 GPa or less; and a coating that is formed on a surface of the metal base, includes hard particles and a metal component composed of at least either simple metal or alloy, and has a Young's modulus of 250 GPa or more. The power transmission device includes the roller. The method of manufacturing the roller includes: forming the coating on the surface of the metal base by thermal spraying using a thermal spray material that comprises the hard particles and the metal component composed of at least either simple metal or alloy.

A method includes depositing a first layer of a first material onto a surface of a chamber component of a processing chamber. The first material comprises a polymer, the polymer having a dielectric strength of at least 40 MV/m. The method further includes depositing a second layer of a second material onto the first layer. The second material comprises a first ceramic material impregnated into the first polymer or a second polymer. The method further includes depositing a third layer. The third layer is of a third material. The third material includes the first ceramic material or a second ceramic material. The third material does not adhere to the first polymer or the second polymer. The third material does adhere to the first ceramic material or the second ceramic material of the second layer.