摘要Ti(C,N)基金属陶瓷由于具有一系列的优良性能,在工业上的应用日益增多,因此 研究 Ti(C,N)基金属陶瓷与 40Cr 钢等异种材 料的连接具有重要的意义。本文是将 Cu73Ti27/Cu/AgCu 作为中间层,对 Ti(C,N)基金属陶瓷与 40Cr 钢进行真空钎焊研究。 对不同焊接工艺下的焊接接头进行四点弯曲试验,测试焊接接头的抗弯强度。利用扫描 电镜(SEM)和能谱(EDS)对界面微观组织断口形貌进行观察和分析。重点研究在焊接压 力相同时,不同焊接温度和不同保温时间下接头界面微观组织的差异和力学性能的变化。79140
试验结果表明:使用 Cu73Ti27/Cu/AgCu 做中间层,能对 Ti(C,N)基金属陶瓷和 40Cr 实现可靠连接。在焊接压力、焊接温度相同的情况下,保温时间越长界面组织更加致密, 力学性能也更好。因为长时间的保温有利于钎料和母材元素的相互扩散和润湿,能使母 材和钎料更好的连接到一起。而在相同压力相同保温时间的条件下,焊接温度越高,界 面组织也更加紧密,力学性能更好。
毕业论文关键词:Ti(C,N)基金属陶瓷;40Cr;AgCu/Cu/Cu73Ti27中间层;钎焊
Abstract Ti(C,N)-based ceramic has a series of excellent performances,The application of industry is increasing day by day, so the research that how to connection Ti(C,N)-based ceramic and 40Cr steel is very important。 In this paper, we use Cu73Ti27/Cu/AgCu as intermediate layer, to vacuum brazing Ti(C,N)-based ceramic and 40Cr steel。 Conduct four point bending test for welded joint under the different welding process, testing weld joint’s bending strength。 Using scanning Electron microscopy (SEM) and energy spectrum (EDS) to observe and analysis fracture morphology of interface microstructure。 Focus research the different welded joint’s interface and mechanical property, which under the same pressure, different welding temperature and different holding time。
Test results show that:When use Cu73Ti27/Cu/AgCu as intermediate layer, Ti(C,N)-based ceramic and 40Cr steel can reliable connection。 Under the same welding pressure and welding temperature, when holding time longer, interface structure is more compact, the mechanical properties will be better。 Because of long time of heat preservation is conducive diffusion and wetting of elements come from base metal and solde r, The base metal and solder can more closely connected。 And under the same welding pressure and holding time,higher welding temperature is, better mechanical properties, and interface organization is more closely, the fracture will farther away the weld。
Keywords: Ti (C, N) - based ceramic; 40Cr; AgCu/Cu/Cu73Ti27 middle layer; brazing
目录
第一章绪论 1
1。1 研究背景 1
1。2 陶瓷基复合材料 2
1。2。1 陶瓷基复合材料的发展 2
1。2。2 Ti(C,N)陶瓷 3
1。2。3 Ti(C,N)陶瓷的发展及应用 4
1。3 陶瓷与金属的连接 4
1。3。1 陶瓷与金属的连接方法介绍 4
1。3。2 陶瓷与金属连接存在的问题 7
1。4 常用的陶瓷和金属钎焊连接用的钎料 7
1。4。1 钎料的分类 7
1。4。2 影响钎料润湿性的因素 8
1。5 本课题的研究内容和意义 9
第二章试验材料、设备与方法