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Causes and solutions of abnormal color of products produced by vacuum furnace heat treatment
Vacuum furnace is the mainstream equipment in heat treatment industry at present. Its products are not only reliable in quality, but also environmentally friendly, without waste treatment. At the same time, energy consumption is significantly lower than traditional heat treatment equipment such as salt bath furnace. Therefore, it is widely used in aerospace, weapons, electronics, automotive, machinery industry and other fields. But it is often seen that the users of the vacuum furnace are posted on the Internet to inquire about the wrong color of the heat treated products of the vacuum furnace. This problem is a common problem in the production of heat treatment. Today, we will introduce you a simple analysis of the reasons and solutions for the abnormal colors. Hope it can help you.
First of all, we can check whether there is a leak in the vacuum furnace equipment itself, which can be measured by the pressure rate index of the vacuum furnace. It is important to remind you that when testing the rate of pressure rise, it is necessary to teCauses and solutions of abnormal color of products produced by vacuum furnace heat treatment
Vacuum furnace is the mainstream equipment in heat treatment industry at present. Its products are not only reliable in quality, but also environmentally friendly, without waste treatment. At the same time, energy consumption is significantly lower than traditional heat treatment equipment such as salt bath furnace. Therefore, it is widely used in aerospace, weapons, electronics, automotive, machinery industry and other fields. But it is often seen that the users of the vacuum furnace are posted on the Internet to inquire about the wrong color of the heat treated products of the vacuum furnace. This problem is a common problem in the production of heat treatment. Today, we will introduce you a simple analysis of the reasons and solutions for the abnormal colors. Hope it can help you.
First of all, we can check whether there is a leak in the vacuum furnace equipment itself, which can be measured by the pressure rate index of the vacuum furnace. It is important to remind you that when testing the rate of pressure rise, it is necessary to test the furnace after the oven is cooled to room temperature, but not to open the furnace door directly and then pump to vacuum for testing.
Secondly, check the air leakage of the inlet pipe of the vacuum furnace, sometimes the pressure rise rate of the vacuum furnace shows normal, but the inlet pipe or valve has leakage in the vacuum furnace. The pressure in the inlet pipe is gradient, the more near the furnace body, the more the negative pressure, which will lead to abnormal color.
Thirdly, we can detect the purity of the inert gas in the vacuum furnace. When the purity of the inert gas is not enough, the oxygen in the inert gas will lead to the oxidation and decarbonization of the product, which will lead to the discoloration of the product. The purity of gas can be directly detected or compared with other equipment.
Finally, the moisture is attached to the inner wall of the vacuum furnace or on the heat exchanger. This moisture is difficult to drain through the oven. If there are no above three problems in the vacuum furnace equipment, the color of the processed product is mostly due to this reason; at this time after the vacuum furnace equipment is raised to high temperature, then stop the heating process and inlet high-purity inert gas into the furnace. Then the circulation system of the fan is started, and the wet gas can be baked by high-temperature and hot-wind.
st the furnace after the oven is cooled to room temperature, but not to open the furnace door directly and then pump to vacuum for testing.
Secondly, check the air leakage of the inlet pipe of the vacuum furnace, sometimes the pressure rise rate of the vacuum furnace shows normal, but the inlet pipe or valve has leakage in the vacuum furnace. The pressure in the inlet pipe is gradient, the more near the furnace body, the more the negative pressure, which will lead to abnormal color.
Thirdly, we can detect the purity of the inert gas in the vacuum furnace. When the purity of the inert gas is not enough, the oxygen in the inert gas will lead to the oxidation and decarbonization of the product, which will lead to the discoloration of the product. The purity of gas can be directly detected or compared with other equipment.
Finally, the moisture is attached to the inner wall of the vacuum furnace or on the heat exchanger. This moisture is difficult to drain through the oven. If there are no above three problems in the vacuum furnace equipment, the color of the processed product is mostly due to this reason; at this time after the vacuum furnace equipment is raised to high temperature, then stop the heating process and inlet high-purity inert gas into the furnace. Then the circulation system of the fan is started, and the wet gas can be baked by high-temperature and hot-wind.