三级c欧美做人爱视频-三级爱爱-三级爱爱视频-三级不卡视频-国产成人 免费观看-国产成人+综合亚洲+天堂

TEL:

18816588806

NEWS

Follow VLT to understand the information

Vacuum coating equipment back pressure leak detection method

Vacuum coating equipment back pressure leak detection method
The back pressure leak detection method is a combination of pressure leak detection and vacuum leak detection. Vacuum coating equipment is mostly used in the non-destructive leak detection technology of sealed electronic devices, semiconductor devices and other sealing parts.
The leak detection process can basically be divided into three steps: charging, purification and leak detection.
(1) The charging process is to store the tested part in a container filled with high-pressure leaking gas for a certain period of time. If the tested part has a leak, the leaking gas can enter the inside of the tested part through the leak. And as the immersion time increases and the inflation pressure increases, the partial pressure of the leaking gas inside the test piece will inevitably increase gradually.
(2) The purification process is to use dry nitrogen flow or dry air flow to spray the inspected part outside or inside the pressurized container.
If there is no gas source, the test piece can also be allowed to stand still in order to remove the leaking gas adsorbed on the outer surface of the test piece.
During the purification process, a part of the gas will inevitably be lost from the inside of the inspected part through the leak, which will cause the partial pressure of the leaking gas inside the inspected part to gradually decrease, and the longer the purification time, the partial pressure of the leaked gas The greater the drop.
(3) The leak detection process is to put the cleaned test piece into the vacuum chamber, connect the leak detector to the vacuum chamber, and perform leak detection.
After vacuuming, due to the pressure difference, the leaking gas can flow out from the inside of the tested part through the leak hole, and then enter the leak detector through the vacuum chamber, and determine the existence and leak rate of the leak according to the output instructions of the leak detector The size.
2021/08/17 16:13:23 2603 次

主站蜘蛛池模板: 国产免费私拍一区二区三区 | 国产成人啪精品午夜在线观看 | a天堂中文在线 | 六月婷操| 国产精品天天干 | 日本sese| 四虎影院海外永久 | 国产一卡二卡3卡4卡四卡在线 | 美女网站一区二区三区 | 婷婷99视频精品全部在线观看 | 黄色网久久 | 淫欲高三| 俺去啦在线视频 | 亚洲欧洲日韩综合 | 免费大片a一级一级 | a资源在线观看 | 午夜cao | 寡妇一级a毛片免费播放 | 亚洲成人网在线 | 哟交小u女国产精品视频 | 男女性生动态免费视频 | 一级片视频播放 | 国产精品三级a三级三级午夜 | 日操夜干 | 午夜宅男在线 | 色噜噜亚洲| 午夜欧美精品久久久久久久 | 日产毛片| 免费国内精品久久久久影院 | 色视频色露露永久免费观看 | 亚洲伊人久久大香线蕉啊 | 人人cao| 婷婷亚洲五月 | 午夜一级成人 | 特黄一级视频 | 欧美在线观看视频一区 | 亚洲伊人成综合成人网 | 亚洲va久久久噜噜噜久久狠狠 | 欧美激情一欧美吧 | 91免费视频网站 | 黄色小网站在线观看 |