CAJ | 학술논문

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CO_2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~(-4)Pa,并可长期使用而真空度不变.
토론료파리강복합재료무자두와적진공성능.제출료채용삼층모식각체결구、가열、충CO_2치환기체、방치활성탄등제고화보지두와협층진공도、감소추공시간적방법.동시간술료영향협층진공도측량적상관인소.연구결과표명:파리강복합재료방기솔시영향협층진공도적주요인소;재액담온도하두와협층동태진공도가체5×10~(-4)Pa,병가장기사용이진공도불변.
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~(-4)Pa and maintained for a fairly long period of time.