| 摘要: |
| 采用BNi2+TiH2复合粉末钎料成功实现C/C复合材料与GH99镍基高温合金的钎焊,对焊后接头界面组织及力学性能进行了分析.结果表明,焊后接头典型界面结构为C/C复合材料/Cr3C2+MC+Ni(s,s)/MC+Ni(s,s)/Ni3Si+Ni(s,s)/Cr3C2+MC+Ni(s,s)/GH99高温合金.钎料中加入TiH2,可促进C/C复合材料母材的溶解,并在钎缝中部形成MC碳化物颗粒.随着TiH2含量的增加,钎缝中部MC形态由细小弥散向大片状转变.当TiH2含量为3%时,接头室温及800,1000℃高温抗剪强度最高,分别可达40,19及10 MPa,接头强度高于BNi2钎料钎焊接头强度,并可有效保证接头高温使用性能. |
| 关键词: C/C复合材料 GH99 BNi2+TiH2钎料 界面组织 抗剪强度 |
| DOI： |
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| 基金项目:国家自然科学基金面上资助项目(51105108,E050803);中央高校基本科研业务费专项资金资助项目(HIT.NSRIF.2010113,2010115);哈尔滨市科技创新人才研究专项基金资助项目(2010RFLXG005) |
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| Brazing of C/C composite and GH99 superalloy Using BNi2+TiH2 composite filler powder |
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TIAN Xiaoyu1, QI Junlei1, ZHANG Lixia1, LIANG Yingchun2, LI Hongwei1, FENG Jicai1,3
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1.State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China;2.School of Mechanical Engineering, Harbin Institute of Technology, Harbin 150001, China;3.Shandong Provincial Laboratory of Special Welding Technology, Harbin Institute of Technology at Weihai, Weihai 264209, China
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| Abstract: |
| The brazing of C/C composite and GH99 nickel base superalloy was successfully performed using BNi2+TiH2 brazing powder. The interfacial microstructure and mechanical properties of the brazed joints were investigated. The results show that,the typical microstructure of the joint is:C/C composite/Cr3C2+MC+Ni(s,s)/MC+Ni(s,s)/Ni3Si+Ni(s,s)/Cr3C2+MC+Ni(s,s)/GH99. With the increasing of content of TiH2,the dissolution of C/C substrate was enhanced,dispersed MC carbide particles formed in braze seam,and the modulus mismatch between C/C and filler alloy,the mechanical properties of the brazed joints were improved consequently. When using braze powder with 3% TiH2 addition, the maximum shear strength of the brazed joints were obtained,which were 40 MPa at room temperature,19 MPa at 800℃ and 10 MPa at 1 000℃. Comparing with brazed joints using BNi2 filler alloy,BNi2+TiH2 joints possess higher strength,and the high-temperature properties of the joints can be guaranteed. |
| Key words: C/C composite GH99 superalloy BNi2+TiH2 braze powder interfacial microstructure mechanical properties |
