PURPOSE: To smoothly form particle dispersion-treated layer by forming a sleeve with a light alloy material and executing composite treatment to inner peripheral surface in a sleeve with a plasma device.

CONSTITUTION: In the case of using a base material side as anode and an electrode 8 as a cathode, metal vapor and gaseous ion direct to the electrode and reversely, electron is intensely hit against the surface of the base material to execute concentric melt-down. Into the melting part R executing the concentric melt-down, ceramics powder 15 fed with powder carrying gas from powder material carrying pipe 14 is introduced and mixed to execute a surface reforming treatment. Then, by running a plasma torch 2, particle dispersing layer C is formed. The particle dispersing layer C mixing and dispersing the ceramic particles in such a manner, has excellent mechanical characteristic in the point of wear resistance, etc., and excellent thermal conductivity.