Diesel piston reciprocating piston internal combustion engines, compressors and pumps and other mechanical cylinder block along the cylinder axis reciprocating mechanical parts. Pistons have a disc-shaped, cylindrical and cylindrical 3 ways. The closed end face of the piston of the diesel engine is subjected to the pressure of the working fluid and forms a combustion chamber or a compacting volume with the cylinder head and the cylinder wall. The application request is as follows.

1, have to meet the strength, stiffness, quality, light weight, to ensure that the minimum inertial force.

2, good thermal conductivity, high temperature, high pressure, corrosion, with plenty of heat to heat a small area.

3, piston and piston wall should have a smaller coefficient of friction.

4, the temperature changes, the size, shape change to be small, and the cylinder wall to maintain the smallest gap.

5, small coefficient of thermal expansion, a small proportion, with good wear resistance and hot strength.