Further testing media were not tested.
2.4. Cleaning processes after PT
After the PT execution the samples were cleaned with the following procedures respectively:
A) cleaner U87 and cloth, cryo blasting with CO2, drying with hotair, ethanol
B) cleaner U87 and cloth, drying in the air and
C) in between cleaning after the penetration process with cleaner U87 and cloth (in this case without the later application of the developer) – thereby typically remains of the penetrant stay onthe surface, especially at rough surfaces.
It is expected that the cleaning effect is most efficient with procedure (A) and is the worst with (C).2.5. Test rig. A schematic of the vacuum chamber and equipment is shown in Fig. 3.The test chamber could be baked withheating bands which were placed on the outside of the vacuum chamber. The temperature of 150 ◦C is the standard bake-out temperature to be applied for the
UHV components at W7-X. The heat was mostly transferred to the
sample by thermal radiation. So the samples were not as hot as the
chamber wall set to 150 ◦C.
3. Results and interpretation
3.1. Mass spectra at room temperature
To show the basically negative influence of the penetrant to the
vacuum environment, the sample no. 8 was investigated in the
mass spectrometer after a particular insufficient cleaning proce-
dure whereby rests ofthe penetrant were clearly visible. The typical
fragments of hydrocarbons at mass numbers between 45 and 100
are clearly visible, see Fig. 4.
Further testing media were not tested.
2.4. Cleaning processes after PT
After the PT execution the samples were cleaned with the following procedures respectively:
A) cleaner U87 and cloth, cryo blasting with CO2, drying with hotair, ethanol
B) cleaner U87 and cloth, drying in the air and
C) in between cleaning after the penetration process with cleaner U87 and cloth (in this case without the later application of the developer) – thereby typically remains of the penetrant stay onthe surface, especially at rough surfaces.
It is expected that the cleaning effect is most efficient with procedure (A) and is the worst with (C).2.5. Test rig.วงจรของสุญญากาศและอุปกรณ์จะแสดงในรูปที่ 3 . ห้องทดสอบสามารถอบ withheating วงซึ่งอยู่ด้านนอกของห้องสูญญากาศ . อุณหภูมิ 150 ◦ C เป็นอุณหภูมิมาตรฐานอบออกมาใช้
uhv ส่วนประกอบที่ w7-x. ความร้อนส่วนใหญ่ถูกโอนไปยัง
ตัวอย่างโดยการแผ่รังสีความร้อน ดังนั้นจำนวนไม่ร้อนเท่าที่
chamber wall set to 150 ◦C.
3. Results and interpretation
3.1. Mass spectra at room temperature
To show the basically negative influence of the penetrant to the
vacuum environment, the sample no. 8 was investigated in the
mass spectrometer after a particular insufficient cleaning proce-
dure whereby rests ofthe penetrant were clearly visible. The typical
fragments of hydrocarbons at mass numbers between 45 and 100
are clearly visible, see Fig. 4.
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