Sliding material and gas compressor

A gas compressor comprising:

• a chamber configured to perform at least one of compression or expansion of a gas;
• and
• a sliding portion including a sliding material that slides on a sliding surface that defines the chamber, wherein the sliding material includes:
• a resin comprising a fluorocarbon polymer;
• a plurality of first particles disposed in the resin and composed of an inorganic material comprising a first Vickers hardness, each first particle of the plurality of first particles comprising a surface;
• and
• a plurality of second particles disposed in the resin and composed of an inorganic material comprising a second Vickers hardness,
• wherein the second Vickers hardness is greater the first Vickers hardness,
• wherein the sliding material comprises a hardness ratio, a content ratio, and a target value,
• wherein the hardness ratio comprises dividing the second Vickers hardness by the first Vickers hardness,
• wherein the content ratio comprises a first contained amount of the plurality of first particles in the resin divided by a second contained amount of the second particles in the resin,
• wherein the target value comprises dividing the hardness ratio by the content ratio, the target value being greater than or equal to 0.3 and less than or equal to 2.8,
• wherein the plurality of first particles comprise one or more of at least one of copper, an alloy whose main component is copper, aluminium, and an alloy whose main component is aluminium,
• wherein each first particle of the plurality of first particles comprises an adhesion layer improving a joining strength between the resin and the plurality of first particles, and
• wherein the second particles include at least one of alumina, silica, zinc oxide, or silicon carbide.