The mechanism of the large-area contamination problem occurring in this vacuum heat test is analyzed as follows: (1) When the vacuum heat test is carried out, the temperature of the liquid nitrogen is 10-2 to 10-4 Pa, and the temperature of the heating belt is lower than 50°C. No volatilization occurs. (2) When the temperature of the heating belt rises to 50°C, volatiles will start to form; when the temperature of the heating tape is lower than 50°C, the volatilization will stop; the pollution of a certain type of vacuum heat test and the countermeasure resolution 79° exceeds 50°C but does not arrive At 200°C, the amount of volatilization increases, but the volatilization stops after a certain period of time. (3) When the external heat loss is controlled, the temperature of the heating belt exceeds 200°C, and the infrared heating cage black paint regenerates. In summary, because of the uncontrolled temperature of the heating belt in the satellite vacuum heat test, the engineering plastic pump led to the volatilization of the infrared heating cage black paint under vacuum and high temperature environment. The test results show that: (1) The new unheated infrared heating cage does not generate volatilization when the temperature of the heating tape is lower than 50°C during liquid nitrogen (vacuum is 10-2 to 10-4 Pa). . (2) When the heating zone temperature rises to 50°C, the heating zone begins to generate volatiles (microbalance data in the vacuum tank begins to rise significantly); Shanghai self-priming pump volatilizes when the heating zone temperature is lower than 50°C (in the vacuum tank) The microbalance data remains stable and no longer changes). (3) After the end of the test, observe and confirm in the tank: the thermal control multi-layer surface of the infrared heating cage black paint does exist a lot of oil pollution, and the odor in the tank is also basically the same as the odor when the KM5A was opened after the last vacuum heat test. (slightly odor). In summary, the vacuum heat test contamination problem was completely reproduced in the small vacuum tank test. Kia Car Combination Switch,Switch And Outlet Combo,Switch Outlet Combo,Combination Light Switch Ruian Dazhong Auto Parts Co., LTD , https://www.radzautoparts.com
The black paint evaporates because of the uncontrolled tropical temperature
The black paint evaporates because of the uncontrolled tropical temperature
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