the appropriate vacuum degree is selected to prevent the alloying elements from evaporating and escaping

the appropriate vacuum degree is selected to prevent the alloying elements from evaporating and escaping

Therefore, due attention should be paid to the evaporation problem in vacuum heat treatment. The idea that as long as the vacuum degree is increased, good results can be achieved is not comprehensive. Due attention must be paid to the problem of evaporation according to the type of workpiece. That is, according to the vapor pressure and heating temperature of alloying elements in the treated metal materials during heat treatment, the appropriate vacuum degree is selected to prevent the alloying elements from evaporating and escaping.
For example, the commonly used alloy elements in steel, such as Mn, Ni, Co, and Cr, as well as the main components of non-ferrous metals, such as Zn, Pb, and Cu, are easily heated in a vacuum to produce vacuum evaporation, which makes the workpiece adhere to each other, and causes obstacles when taking out from the material frame. In addition, in vacuum brazing of stainless steel with Cu and Ag-Mn alloys (as filler metals), when heated below 0.0133Pa, Mn is evaporated and its composition changes significantly, resulting in a significant decrease in the strength of the brazing site. In the case of 70~30 brass, Zn is significantly evaporated during vacuum annealing, resulting in the dezinc phenomenon, so it is very difficult to obtain a bright surface.

IKS PVD company, decorative coating machine, tools coating machine, DLC coating machine, optical coating machine, PVD vacuum coating line, the turn-key project is available. Contact us now, E-mail: iks.pvd@foxmail.com