Thermal spraying method of component for plasma processing apparatus and component for plasma processing apparatus

A method of thermal spraying a component for a plasma processing apparatus performed by a plasma spraying apparatus including a nozzle and a plasma generating unit having a common axis with the nozzle, the plasma generating unit including a plurality of gas supply paths configured to supply, into the plasma generating unit, Ar gas in a direction perpendicular to the nozzle, in order to generate a rotational flow in the plasma generating unit, the method comprising:

• injecting, with a plasma generating gas, feedstock powder having a particle diameter of 15 μm or less from a tip of the nozzle to the plasma generating unit;
• supplying Ar gas from the plurality of gas supply paths into the plasma generating unit to generate the rotational flow in the plasma generating unit;
• generating a plasma from the plasma generating gas in the plasma generating unit, by using electric power not more than 50 kW;
• and
• thermal spraying the feedstock powder liquefied by the plasma at a concave portion defined by the component, an electrostatic chuck and a resin layer provided between the component and the electrostatic chuck through a mask, such that a surface of the resin layer that is exposed to the concave portion between the component and the electrostatic chuck is in close contact with the feedstock powder;
• wherein
• the mask is a coating mask that is coated to form an opening corresponding to an entirety of the surface of the resin layer,
• the resin layer of the component is exposed on a side surface of the component,
• the component is placed on a turn table such that the side surface of the component faces outward in a radial direction of the turn table, and
• the liquefied feedstock powder is sprayed toward the component on the turn table in a direction perpendicular to a central axis of the turn table while rotating the turn table, thereby to cover the resin layer exposed on the side surface of the component with the feedstock powder in a circumferential direction of the component.

A method of thermal spraying a component for a plasma processing apparatus performed by a plasma spraying apparatus including a nozzle and a plasma generating unit having a common axis with the nozzle, the plasma generating unit including a plurality of gas supply paths configured to supply, into the plasma generating unit, Ar gas in a direction perpendicular to the nozzle, in order to generate a rotational flow in the plasma generating unit, the method comprising:

• injecting, with a plasma generating gas, feedstock powder of alumina (Al2O3) or yttria (Y2O3) having a particle diameter of 15 μm or less from a tip of the nozzle to the plasma generating unit;
• supplying Ar gas from the plurality of gas supply paths into the plasma generating unit to generate the rotational flow in the plasma generating unit;
• generating a plasma from the plasma generating gas in the plasma generating unit, by using electric power not more than 50 kW;
• and
• thermal spraying the feedstock powder liquefied by the plasma at a concave portion defined by the component, an electrostatic chuck and a resin layer provided between the component and the electrostatic chuck through a mask, such that a surface of the resin layer that is exposed to the concave portion between the component and the electrostatic chuck is in close contact with the feedstock powder and that the feedstock powder is deposited at a width of 100 μm to 1000 μm and at a thickness of 5 μm to 20 μm;
• wherein
• the component includes an electrostatic chuck or an upper electrode,
• the component is placed on a turn table such that the side surface of the component faces outward in a radial direction of the turn table,
• the liquefied feedstock powder is sprayed toward the component on the turn table in a direction perpendicular to a central axis of the turn table while rotating the turn table, thereby to cover the resin layer exposed on the side surface of the component with the feedstock powder in a circumferential direction of the component, and
• the mask is a coating mask that is coated to form an opening corresponding to an entirety of the surface of the resin layer.