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石英玻璃的透氣性

作者: 來源: 日期:2019/7/31 9:27:52 人氣:325 標簽:石英玻璃 透氣性

在常溫下,可以認為石英玻璃是不透氣的,在高溫(例如700℃)下,某些氣體的透氣常數也很小。因此可以用在高溫高真空裝備中。 

表  石英玻璃容器連續抽真空所獲得的最高真空度(實驗條件)

種類                 真空度(毫米汞柱)及溫度(℃)

                                      20         900

透明石英玻璃         3.7×10-6     7.0×10-6

不透明石英玻璃     1×10-5     7.4×10-6

表 石英玻璃的透氣常數K

氣體 透氣常數K

        200℃         400℃         600℃         700℃         800℃         900℃         1000℃

氦     1.39             6.15          16.4             21.9            28.5           36.2            45.4

氫     0.022           0.37          1.43             2.52            4.25           6.40           10.00

氘(重氫) 17

氖      2.8             4.2

氬 <10-15

氧 <10-15

氮 <10-15

單位:×10-10厘米3.毫米/秒.厘米2乇(在標準壓力下)


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