Development and Prospect of Heat Treatment of Vacuum Coating Equipment

Vacuum heat treatment of vacuum coating equipment refers to the technology that metal parts are heated under vacuum or firstly evacuated and then passed through an inert gas, and then quenched and cooled in oil or gas. During vacuum heat treatment, the workpiece is basically not oxidized, and the steel parts are not decarburized. The use of ventilation convection heating can also make the heating uniform, reduce the temperature difference between the surface and the core, and thus reduce distortion. At present, it has become an indispensable and preferred heat treatment process for high-quality tools. Even more valuable is that vacuum heat treatment does not produce any environmentally polluting substances during the production process, and is therefore recognized as a clean production technology. It is no exaggeration to say that vacuum heat treatment has become the main symbol of current advanced heat treatment production technology.

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Heating the workpiece under vacuum mainly relies on radiation. Because the radiation heat transfer is proportional to the fourth power of temperature, the radiation effect is not high below 850℃, and the workpiece heating speed is very slow; secondly, because some alloy elements in the metal material have evaporation loss when heated under low pressure , It will cause the depletion of the surface alloy elements, which will affect the performance of the surface layer after quenching. Convection heating technology means that the furnace of the vacuum coating equipment is first evacuated to a certain degree of vacuum, and then passed the inert (Ar, He), neutral (N2) or reducing (H2) gas of 0.1-0.2MPa Heating under sufficient agitation conditions, the heating rate can be at least doubled compared with under simple vacuum conditions.

High-carbon, high-alloy tool steel vacuum coating equipment is vacuum-heated austenitized and quenched and cooled in an inert, neutral or reducing gas is inert. Quenching and cooling in neutral or reducing gas is the only feasible way to ensure quality. However, the air cooling under negative pressure and normal pressure can not achieve good hardening effect for large workpieces or batch materials. One gas itself needs to be cooled, and the other is to increase the cooling capacity of the gas under limited volume conditions, only by increasing the amount of cooling gas, that is, increasing the pressure of the cooling gas.

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Zunhua Baorui Titanium is dedicated to the development and production of vacuum coating machines and vacuum coating equipment, providing customized process solutions and coating equipment to industry customers.