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Self-propagating synthesis joining of C_(f)/al composites and TC4 alloy using AgCu filler with Ni-al-Zr interlayer

Rare Metals 2021年第7期40卷 1817-1824页

作者： Lei Shen Zhuo-Ran Li Guang-Jie Feng Shu-Ye Zhang Zhi Zhou Peng He State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China College of Materials Science and Engineering Chongqing UniversityChongqing 400044China

The successful joining of carbon fiber-reinforced aluminum matrix(C_(f)/al)composites and TC4 alloy can produce composite structure and meet the demands of lightweight in aerospace *** to now,few experimental researches have been reported on the joining of C_(f)/al composites and TC4 *** this study,the AgCu foils and Ni-al-Zr compact were designed for the self-propagating high-temperature synthesis joining of these two materials.C_(f)/al composites were joined with a reactive Ti plated on its joining *** typical microstructure of TC4/(AgCu/Ni-al-Zr/AgCu)/Ti/C_(f)/al joint was analyzed,and the effects of joining condition on microstructural evolution of the SHS joint were investigated.A thin reaction layer of Ni-al-Ti intermetallic compounds was formed adjacent to the TC4 *** a result,AgCu foils could reduce the effect of reaction heat on the substrates and improve the joint shear *** the thickness of AgCu foils reaches 150 lm,the Ni-al-Zr interlayer mainly acts as auxiliary heat *** joining pressure caused the active elements to diffuse into C_(f)/al composites and weakened the shear strength of the ***,the joint shear strength could reach 36.4 MPa when the AgCu foils were 50 lm and the joining pressure was 2 MPa.

关键词： cf/al composites TC4 alloy Self-propagating high-temperature synthesis joining Microstructure Shear strength

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Study on Anticorrosive Cerium Conversion Coating of C_f/6061A1 Composite Surface

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Journal of Rare Earths 2006年第Z2期24卷 64-67页

作者：王春雨张强周骥武高辉 School of Materials Science and Engineering Harbin Institute of Technology

The optimum chemical passivation process of the rare earth metal (REM) conversion coating on the cf/6061al composite surface was introduced in this paper and its polarization curves properties were investigated. Ridge-like coatings were found by scanning electro microscope (SEM) observations, and the al matrix and carbon fibre reinforcement were both coated with Ce conversion coatings, with some minor cracks. The energy dispersive spectroscopy (EDS) plane scan analysis indicates that the major elements in the coating are Ce, O, Si, al and the Ce content reaches 47.48% (mass fraction). The Ce conversion coatings increase the corrosion resisting properties of cf/6061A1 composite, with a higher free corrosion potential (Ecorr) and a lower free corrosion current density (icorr) for the coated composite than those of the bare composite. And the Boehmite-treatment would enhance the corrosion resistance of the REM conversion coating. The ca-thodic polarization and anodic polarization were retarded by REM conversion coating, resulting in an improved corrosion resistance.

关键词： cf/al composites REM conversation coating Ce corrosion resistance rare earths

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