本文利用AgCuTi-W复合钎料作中间层,在适当的工艺参数下真空钎焊C_f/SiC复合材料与Ti合金,利用SEM,EDS,XRD分析接头微观组织结构,利用剪切试验检测接头力学性能.研究结果表明:钎焊时,复合钎料中的Ti借助Cu-Ti液相与C_f/SiC复合材料反应,在C_f/SiC复合材料与连接层界面形成Ti3SiC2,Ti3Si和少量TiC化合物的混合反应层.复合钎料中的Cu与Ti合金中的Ti发生互扩散,在连接层与Ti合金界面形成不同成分的Cu-Ti化合物过渡层.钎焊后,形成W颗粒强化的致密复合连接层,W颗粒主要分布在Cu-Ti相中.W的加入缓解了接头的残余热应力,C_f/SiC/AgCuTi-W/TC4接头剪切强度明显高于C_f/SiC/AgCuTi/TC4接头.
C_f/SiC was successfully joined to Ti alloy with AgCuTi-W mixed powder by some suitable brazing parameters. Microstructures of the brazed joint were investigated by SEM, EDS and XRD. The mechanical properties of the brazed joints were measured by mechanical testing machine. The results showed that Ti element in the interlayer can reaction with the brazed composite, a mixture of Ti3SiC2,Ti3Si and TiC composites finally formed the reaction layer between composite and interlayer. Ti alloy constantly dissolves and Cu diffuses into the Ti alloy, forming the diffusion -reaction layers between interlayer and Ti alloy. The performed joints have dense bonding layers reinforced by W. These composite brazing layers relaxed the thermal stress of the joint effectively. These characteristics were beneficial to the joint, of which the shear strength were remarkably highly than the optimal shear strengths of the joint brazed with pure AgCuTi.
参考文献
| [1] | M. lmuta;J. Gotoh .Development of High Temperature Materials Including CMCs for Space Application[J].Key engineering materials,1999(164/165):439-444. |
| [2] | ECKE A .Thermal shock fiber reinforced ceramic matrix,composites[J].Ceramic Engineering and Science Process,1991,73(7-8):1500-1508. |
| [3] | Xu Yongdong;Cheng Laifei;Zhang Litong .Carbon /silicon carbide composites prepared by chemical vapor infiltration combined with silicon melt infiltration[J].Carbon: An International Journal Sponsored by the American Carbon Society,1999(8):1179-1187. |
| [4] | BOURRAT X;ALRIVIE M;MICHAUX A .TEM thin foil preparation for ceramic composites with multilayered matrix[J].Journal of the European Ceramic Society,2005,25(06):809-815. |
| [5] | Jerzy A. Golczewski;Fritz Aldinger;J. A. Golczewski;F. Aldinger .Phase separation in Si-(B)-C-N polymer-derived ceramics[J].Zeitschrift fur Metallkunde,2006(2):114-118. |
| [6] | Haug J.;Lamparter P.;Weinmann M.;Aldinger F. .Diffraction study on the atomic structure and phase separation of amorphous ceramics in the Si-(B)-C-N system. 2. Si-B-C-N ceramics[J].Chemistry of Materials,2004(1):83-92. |
| [7] | LIN Guo-biao;HUANG Ji-hua;ZHANG Hua .Microstructure and mechanical performance of the brazed joints of Cf/SiC composite and Ti alloy using Ag-Cu-Ti-W[J].Science and Technolngy of Welding and Joining,2006,11(04):379-383. |
| [8] | G.B. Lin;J.H. Huang .Brazed joints of C_f-SiC composite to Ti alloy using Ag-Cu-Ti-(Ti + C) mixed powder as interlayer[J].Powder Metallurgy,2006(4):345-348. |
| [9] | Li SJ.;Zhang JJ.;Liang XB.;Duan HP.;Zhang Y. .Joining of carbon fibre reinforced SiC (C-f/SiC) to Ni-based superalloy with multiple interlayers[J].International Journal of Modern Physics, B. Condensed Matter Physics, Statistical Physics, Applied Physics,2003(8/9):1777-1781. |
| [10] | Xiong JT;Li JL;Zhang FS;Huang WD .Joining of 3D C/SiC composites to niobium alloy[J].Scripta materialia,2006(2):151-154. |
| [11] | ASTHANA R;SINGH M .Joining of partially sintered alumina to alumina,titanium,hastelloy and C-SiC composite using Ag-Cu brazes[J].Journal of the European Ceramic Society,2008,28:617-631. |
| [12] | HANSO W B .Joining of ceramics using a ceramic-modified braze alloy[J].Materials Technology,1999,14(02):53-56. |
| [13] | 杨建国;方洪渊;万鑫 .Ag-Cu-Ti活性钎料加入Al_2O_3陶瓷颗粒对Al_2O_3陶瓷钎焊接头性能的影响[J].材料科学与工艺,2001,9(zk):676-678. |
| [14] | 杨俊,吴爱萍,邹贵生,张德库,刘根茂.Solid-Liquid State Bonding of Si3N4 Ceramics with Ceramic-Modified Brazing Alloy[J].清华大学学报(英文版),2004(05):601-606. |
| [15] | Zhu MG.;Chung DDL. .IMPROVING THE STRENGTH OF BRAZED JOINTS TO ALUMINA BY ADDING CARBON FIBRES[J].Journal of Materials Science,1997(20):5321-5333. |
| [16] | LIN Guo-biao;HUANG Ji-hua;ZHANG Hua .Joints of carbon fiber-reinforced SiC composites and Ti-alloy brazed by Ag-Cu-Ti-short carbon fibers[J].Journal of Materials Processing Technology,2007,189:256-261. |
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