期VOI.44，No.6第44卷第6月真空VACUUM20()7年11ov.N2007第一讲:真空科学的发展及其应用·······························································⋯⋯李云奇95(2)第二讲:真空物理基础··············································································⋯⋯张世伟95(3)第三讲:机械真空泵(一)(二)(三)(四)(五)(六)··················⋯⋯张以忱95(4)、(5)、(6)、96(1)、(2)、(3)第四讲:蒸汽流真空泵··············································································⋯⋯姚民生%(4)第五讲:气体捕集式真空泵········································································⋯⋯徐成海%(5)第六讲:真空测量····························································⋯⋯刘玉岱96(6)、97(1)、(2)、(3)、(4)第七讲:真空检漏····························································⋯⋯关奎之97(5)、(6)、98(1)、(2)、(3)第八讲:真空系统设计················································⋯⋯王继常98(4)、(5)、(6)、99(1)、(2)、(3)第九讲:真空系统组成元件·············..·····················⋯⋯王继常99(4)、(5)、(6)、00(1)、(2)、(3)、(4)第十讲:真空密封················································⋯⋯王继常00(5)、(6)、01(1)、(2)、(3)、(4)、(5)第十一讲:真空材料····································⋯⋯张以忱01(6)、02(1)、(2)、(3)、(4)、(5)、(6)、03(1)第十二讲:真空工艺········································...·················⋯⋯张以忱03(2)、(3)、(4)、(5)、(6)第十三讲:真空系统的检测技术············⋯⋯张以忱04(1)、(2)、(3)、(4)、(5)、(6)、05(1)、(2)、(3)、(4)第十四讲:真空工程用焊接技术·········⋯⋯张以忱05(5)、(6)、06(1)、(2)、(3)、(4)、(5)、(6)、07(1)、(2)第十五讲真空工程封接技术······················································⋯⋯张以忱07(3)、(4)、(5)第十五讲真空工程封接技术张以忱(东北大学，辽宁沈阳n(拟)4)中图分类号:TB743:TB79文献标识码E文章编号:1(X)2一0322(2007)06一(X)85一03(上接2007年第5期)3.4.2直接钎焊工艺常用的高温活性钎料见表5。述的陶上瓷金属化形成的各种钎焊接头，因表5用于直接钎焊陶瓷的高温活性钎料为存在着涂层或镀层，使陶瓷组件在高温使用受熔化温度钎焊温度到限制，难以发挥陶瓷高温稳定的优越性，要求钎料用途及接头性能℃)(℃)(人们寻找直接钎焊的方法。92Ti一SCu907820~9(X)陶瓷一金属瓷直接陶钎焊能够解决因盲孔或几何尺寸75Ti一25Cu708以力~950陶瓷一金属因素而不能完全进行金属化预处理零件的连接72Ti一28Ni4291401陶瓷一陶瓷、陶瓷一石墨、问题，能大大简化钎焊工艺和满足陶瓷构件高温陶瓷一金属使用的要求。这种方法是使用含有Ti或2:的活50Ti一50Cu印9980~1050陶瓷一金属50TI一50Cu(原子比)1210~131013的~l50()陶瓷一蓝宝石、性元素的钎料，直接把陶瓷与金属、陶瓷与陶瓷、陶瓷一锉陶瓷与石墨等钎焊起来。直接钎焊选用的钎料熔7’Fi一93(BAg72Cu)797820~850陶瓷一钦11洲洲〕e3791801自粘碳化硅一金属化温度较高，能满足陶瓷构件高温状态使用的要(巩=粼刃MPa)