Preparation method of carbon gradient base steel coating on PTFE matrix

The invention discloses a preparation method of a carbon gradient base steel coating on a PTFE matrix. The method comprises the following steps that pure sodium metal liquid is uniformly sprayed on aPTFE matrix surface, after the pure sodium metal liquid is condensed in the air, the matrix is subjected to the ultrasonic treatment to obtain an active surface PTFE matrix; the ferric hydroxide colloid is coated on the active surface PTFE matrix, and then the calcination is carried out and the reduction treatment is carried out so as to obtain a pure iron thin layer PTFE matrix; and pure iron powder, low carbon steel powder, medium carbon steel powder and high carbon steel powder are selected as spraying powder, and the pure iron thin layer PTFE matrix is spayed by the pure iron powder, the low carbon steel powder, the pure iron powder, the medium carbon steel powder, the pure iron powder and the high carbon steel powder in order so as to obtain the carbon gradient base steel coating. Themethod has the advantages