Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第15卷    第9期    总第78期    2005年9月

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文章编号: 1004-0609(2005)09-1326-06
Ag-Cu-Ti-(Ti+C)反应-复合钎焊SiC陶瓷和Ti合金的
接头组织
林国标1, 黄继华1, 张建纲1, 刘慧渊1, 毛建英2, 李海刚2

(1. 北京科技大学 材料科学与工程学院, 北京 100083;
2. 中国航天科技集团公司 第一研究院703所, 北京 100076
)

摘 要:  研究用合金化Ag-Cu-Ti粉、 Ti粉、 C粉组成的混合粉末真空无压钎焊再结晶SiC陶瓷和Ti合金, 采用X射线衍射、 扫描电镜和能谱仪对接头的组织结构进行了分析。 结果表明: 在67.6%Ag-26.4%Cu-6%Ti(质量分数)粉末中加入相当于15%~30%TiC(体积分数)的(Ti+C)粉末(Ti与C摩尔比为1∶1), 经920℃, 30min真空钎焊, Ti和C原位合成TiC, 形成以TiC晶粒强化的连接良好的复合接头; 形成的TiC分布于Ag相、 Cu-Ti相中; TiC的形成明显降低了接头的热应力。 过量的(Ti+C)粉末则导致反应不完全, 容易在连接层中产生孔洞, 影响接头强度; 焊接过程中, Ti由钛合金扩散进入连接层, Cu也有部分从连接层中扩散进入钛合金。

 

关键字:  SiC陶瓷; Ti合金; 原位合成TiC; 连接; 复合钎焊

Microstructure of reactive composite brazing joints of SiC ceramics and Ti alloy by using Ag-Cu-Ti-(Ti+C) as bonding material
LIN Guo-biao1, HUANG Ji-hua1, ZHANG Jian-gang1,
LIU Hui-yuan1, MAO Jian-ying2, LI Hai-gang2

1. School of Materials Science and Engineering,
University of Science and Technology Beijing,
Beijing 100083, China;
2. 703 Institute of the First Academy,
China Aerospace Science and Technology Corporation,
Beijing 100076, China

Abstract: By using the mixed powder of Ti, C (mole ratio of Ti to C is 1∶1) powders for in-situ synthesizing TiC in 15%-30%TiC (volume fraction) and alloying 67.6%Ag-26.4%Cu-6%Ti (mass fraction) powder as vacuum non-pressure brazing material, sound brazed joints of SiC ceramics /Ti alloy were acquired at 920℃ for 30min. The joints were investigated by X-ray diffractrometry, scanning electron microscopy, and energy dispersive spectrometry. The results show that TiC grains are in-situ synthesized and distribute in Ag and Cu-Ti phases of the bonding layers, distinctly lowering the thermal stress of the joints. However, excess amount of (Ti + C) powder easily brings about the formation of pores and incomplete reactions of Ti and C in the bonding layers, which are detrimental to the joints' strengths. During brazing process, Ti element in Ti-alloy and Cu element in the bonding layer interdiffuse.

 

Key words: SiC ceramics; Ti-alloy; in-situ synthesizing TiC; bonding; composite-brazing

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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