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B4C-TiB2-SiC-TiC复合陶瓷钎焊接头微观组织及力学性能
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合肥工业大学材料科学与工程学院

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中图分类号:

TG454

基金项目:

安徽省自然科学基金(2208085ME134);科技部磁约束核聚变能发展研究专项(2015GB121003);


Microstructure and mechanical properties of brazed B4C-TiB2-SiC-TiCcomposite joints
Author:
Affiliation:

Hefei University of Technology

Fund Project:

Natural Science Foundation of Anhui Province, National Key Research and Development Program of China

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    摘要:

    采用Ag-Cu-Ti钎料及Ag-Cu-Ti+B4C复合钎料对高性能B4C-TiB2-SiC-TiC(BTST)复合陶瓷进行了钎焊连接,分析了Ag-Cu-Ti钎料在复合陶瓷表面的润湿行为,研究了钎焊温度、保温时间以及B4C含量对接头界面组织及力学性能的影响。结果表明:钎料对BTST复合陶瓷具有良好的润湿性,界面反应主要发生在Ti与复合陶瓷之间,反应产物主要为TiC和TiB。钎焊温度和保温时间显著影响钎焊接头的界面组织和力学性能。随着钎焊温度的提高或保温时间的延长,BTST复合陶瓷侧界面反应层逐渐增厚,钎缝组织趋向于形成Ag-Cu共晶组织,钎焊接头弯曲强度先升高后降低。随着钎料中B4C含量的增加,接头中陶瓷侧反应层厚度急剧降低,钎缝区域组织得到细化,接头强度先升高后降低。当添加B4C颗粒含量为1wt.%,钎焊温度890℃,保温时间15 min时,钎焊接头弯曲强度最高为314.2 MPa。

    Abstract:

    Ag-Cu-Ti and Ag-Cu-Ti+B4C composite brazing alloys were successfully used to braze the B4C-TiB2-SiC-TiC (BTST) composite ceramic. The effects of brazing temperature and holding time on the interfacial microstructure and mechanical properties of the joints were investigated. The results show that Ag-Cu-Ti brazing alloy had a good wettability with BTST and Ti reacted with BTST to form TiC and TiB. The thickness of reaction layer increased with the increase of brazing temperature or holding time, and Ag-Cu eutectic alloy formed in the brazing seam. The bending strength of the joints increased with the brazing temperature or holding time first and then decreased. The addition of B4C into the Ag-Cu-Ti refined the microstructure of brazing seam and reduced the thickness of reaction layer. The maximum bending strength of the joint achieved was 314 MPa, when the BTST composite ceramic was brazed at 890℃ for 15 min using the Ag-Cu-Ti with 1 wt.% B4C.

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钟志宏,袁东立,朱文静,魏仁伟,宋奎晶,吴玉程. B4C-TiB2-SiC-TiC复合陶瓷钎焊接头微观组织及力学性能[J].稀有金属材料与工程,2024,53(4):1086~1094.[Zhong Zhihong, Yuan Dongli, Zhu Wenjing, Wei Renwei, Song Kuijing, Wu Yucheng. Microstructure and mechanical properties of brazed B4C-TiB2-SiC-TiCcomposite joints[J]. Rare Metal Materials and Engineering,2024,53(4):1086~1094.]
DOI:10.12442/j. issn.1002-185X.20230011

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  • 收稿日期:2023-01-07
  • 最后修改日期:2023-02-22
  • 录用日期:2023-03-15
  • 在线发布日期: 2024-04-26
  • 出版日期: 2024-04-23