Reasons and Solutions for Abnormal Color of Products Produced by Vacuum Furnace Heat Treatment

Vacuum furnace is the mainstream equipment in the current heat treatment industry, and its processed products are not only reliable in quality, but also environmentally friendly, without the need for three wastes treatment, and their energy consumption is significantly lower than traditional heat treatment equipment such as salt bath furnaces; Therefore, it is widely used to solve the problem of incorrect color of products produced by aviation heat treatment, which is a common problem in heat treatment production. Today, I will briefly analyze the causes and solutions for the problem of incorrect color of products processed by vacuum furnace.
Firstly, we can detect whether there is air leakage in the vacuum furnace equipment itself, which can be determined by the pressure rise rate index of the vacuum furnace; Here, it is important to remind everyone that when testing the pressure rise rate, it is necessary to dry the furnace and then cool it to room temperature before testing, instead of opening the furnace door and then vacuuming for testing.
Secondly, check whether there is a leak in the intake pipe of the vacuum furnace. Sometimes we test the pressure rise rate of the vacuum furnace to indicate that it is normal, but there is a leak in the intake pipe or valve of the vacuum furnace. The pressure in the intake pipe is gradient, and the closer to the end of the furnace, the more negative pressure there is, which also leads to the incorrect color of the products processed by the vacuum furnace.
Thirdly, we can detect whether the purity of the inert gas introduced into the vacuum furnace equipment is high or not. When the purity of the inert gas is insufficient, the oxygen mixed in it will lead to oxidation, decarbonization, and other behaviors of the product, which will lead to product discoloration. The purity of the detected gas can be directly detected or conclusions can be drawn through comparative testing with other equipment.
The moisture in the vacuum furnace equipment adheres to the inner wall or heat exchanger of the vacuum furnace, which is difficult to discharge through the oven drying method. When the vacuum furnace equipment does not have the above three problems, it is mostly due to this reason that the color of the processed product is still incorrect; At this point, we can raise the vacuum furnace equipment to a high temperature, stop heating, inject high purity inert gas into the furnace, and then start the fan circulation system, using the high temperature and hot air in the vacuum furnace to bake out the moisture adhering to the inner wall of the vacuum furnace and the heat exchanger, thereby solving this problem.