A kind of self-made AgCuTiSn braze alloy powder was used to join graphite and copper. The whole brazing process was performed under vacuum circumstances at different temperatures （ 1 033 - 1 193 K） for several holdi...A kind of self-made AgCuTiSn braze alloy powder was used to join graphite and copper. The whole brazing process was performed under vacuum circumstances at different temperatures （ 1 033 - 1 193 K） for several holding time （300 - 1 800 s ）. According to scanning electron microscope （SEM）, energy dispersive spectrometer （EDS） and electron probe X-ray microanalysis （ EPMA ） results, the reaction products of the interface are TiC, Ti3Sn, Cu（s. s）, Ag（s. s） and Cu-Sn compound. As the brazing parameters increase, the quantity of Ag（ s. s） in the braze alloy and C fibers on graphite/AgCuTiSn interface reduce, while that of Cu （ s. s） in the braze alloy improves. When the brazing temperature /s 1 093 K and holding time is 900 s, the joint can obtain the maximum room temperature shear strength 24 MPa.展开更多
基金This work was supported by the National Natural Science Foundation of China （No. 50705022）.
文摘A kind of self-made AgCuTiSn braze alloy powder was used to join graphite and copper. The whole brazing process was performed under vacuum circumstances at different temperatures （ 1 033 - 1 193 K） for several holding time （300 - 1 800 s ）. According to scanning electron microscope （SEM）, energy dispersive spectrometer （EDS） and electron probe X-ray microanalysis （ EPMA ） results, the reaction products of the interface are TiC, Ti3Sn, Cu（s. s）, Ag（s. s） and Cu-Sn compound. As the brazing parameters increase, the quantity of Ag（ s. s） in the braze alloy and C fibers on graphite/AgCuTiSn interface reduce, while that of Cu （ s. s） in the braze alloy improves. When the brazing temperature /s 1 093 K and holding time is 900 s, the joint can obtain the maximum room temperature shear strength 24 MPa.
