What is the principle of vacuum heat treatment

Vacuum heat treatment refers to a new type of heat treatment technology combining vacuum technology and heat treatment technology. Among them, the vacuum environment of vacuum heat treatment refers to an atmosphere environment lower than one atmospheric pressure, including low vacuum, medium vacuum, high vacuum and ultra-high vacuum. Therefore, vacuum heat treatment actually belongs to atmosphere controlled heat treatment.

(1) Phase transformation characteristics of metals in vacuum. The thermodynamics and kinetics of solid phase transition do not change much in the vacuum which is only 0.1MPa away from atmospheric pressure. The principle of solid-state phase transformation at atmospheric pressure can be used to formulate the vacuum heat treatment process. It can refer to the data of various types of organization transformation under normal pressure.

(2) Vacuum degassing can improve the physical and mechanical properties of metal materials.

(3) Vacuum degreasing.

(4) Evaporation of metal: when heated in vacuum, elements on the surface of the workpiece will evaporate.

(5) With the function of surface purification, heating without oxidation and decarbonization can be realized.

(6) The degree of vacuum required for non oxidizing heating of metals.