Research on Vacuum High Temperature Experiment
The temperature of the heating zone was once again controlled to 180°C. The data of the microbalance remained stable and did not increase, indicating that the infrared heating cage black lacquer had been almost completely volatilized after being fully baked at high temperatures. It also showed that if the black paint decomposition temperature was not reached, Infrared heating cages that have been fully baked at high temperatures will no longer volatilize.
In order to verify that in the process of vacuum heat test through liquid nitrogen and during the test, the temperature controlled under 150°C, the infrared heating cage decontaminated by the vacuum high temperature environment no longer outgassing, and a small vacuum tank verification test was conducted again. .
The technical status of this test is basically the same as the verification test of the first small vacuum equipment except the following points: the flow-through oven test thermal control multi-layer replacement with a new thermal control multilayer; the test utilization has been subjected to vacuum high temperature environment Baked infrared heating cage; control the temperature of the heating zone can not exceed 150 °C.
The test results show that: (1) In the process of liquid nitrogen (vacuum is 10-2 ~ 10-4Pa), the heating zone temperature is lower than 50 °C and the temperature continues to rise to about 70 °C, the microbalance data does not increase, indicating that the heating Bands do not volatilize during this process.
(2) When the temperature of the heating zone continues to rise to about 148°C, the balance data still does not increase. The rubber injection machine shows that the heating zone does not generate volatility in a vacuum environment below 150°C; (3) After the end of the test, a small vacuum occurs. The observation in the tank confirmed that there was no oil stain on the thermally controlled multi-layer surface of the infrared heating cage black paint.
In summary, the purpose of the second verification test in the small vacuum tank is reached, ie, the infrared heating cage decontaminated by the vacuum high temperature environment will not be generated when the vacuum heat test passes through the liquid nitrogen process and the high temperature is below 150°C. Volatilize.
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