玻璃钢复合材料无磁杜瓦真空性能研究  

Improvement of Vacuum Thermal Isolation in Fiber Reinforced Plastic Composite Nonmagnetic Dewar

作　　者：杨长春[1] 潘皖江[1] 武松涛[1] 

机构地区：[1]中国科学院等离子体物理研究所,合肥230031

出　　处：《真空科学与技术学报》2010年第2期193-197,共5页Chinese Journal of Vacuum Science and Technology

摘　　要：讨论了玻璃钢复合材料无磁杜瓦的真空性能。提出了采用三层模式壳体结构、加热、充CO2置换气体、放置活性炭等提高和保持杜瓦夹层真空度、减少抽空时间的方法。同时简述了影响夹层真空度测量的相关因素。研究结果表明:玻璃钢复合材料放气率是影响夹层真空度的主要因素;在液氮温度下杜瓦夹层动态真空度可达5×10-4Pa,并可长期使用而真空度不变。A novel technique has been successfully developed to improve the vacuum thermal isolation of the glass- fiber-reinforced plastic （GFRP） composite nonmagnetic Dewar. In the technique, three measures, including surface heating, surface sputtering with carbon dioxide and installing activated carbon as vacuum getters into the interlayer, significantly shorten the pumping time, and slow down the pressure build-up in the vacuum interlayer of the GFRP Dewar. The impacts of various negative factors, such as out-gassing of GFRP composite walls and external gas penetration, on performance of the vacuum thermal isolation were also experimentally studied. The results show that the surface out-gassing is mainly responsible for the pressure increase, and that at 77K, the base pressure in the Dewar vacuum interlayer can be 5.0 × 10^-4pa and maintained for a fairly long period of time.

关 键 词：夹层真空度 真空性能 玻璃钢 无磁杜瓦 

分 类 号：TB472[一般工业技术—工业设计]