Alumina was joined with graphite by active metal brazing technique at 895,900,905,and 910 ℃ for 10 min in vacuum of0.67 mPa using Ti-Cu-Ag（68.8Ag-26.7Cu-4.5Ti;mass fraction,%） as filler material.The brazed samples ...Alumina was joined with graphite by active metal brazing technique at 895,900,905,and 910 ℃ for 10 min in vacuum of0.67 mPa using Ti-Cu-Ag（68.8Ag-26.7Cu-4.5Ti;mass fraction,%） as filler material.The brazed samples were thermal cycled between 30 and 600 ℃ and characterized.X-ray diffraction results show strong reaction between titanium and carbon as well as titanium and alumina.Scanning electron microscopy and helium leak tests show that the initial and thermal cycled brazed samples are devoid of cracks or anv other defects and hermeticity in nature.Brazing strength of the joints is found to be satisfactory.展开更多
文摘Alumina was joined with graphite by active metal brazing technique at 895,900,905,and 910 ℃ for 10 min in vacuum of0.67 mPa using Ti-Cu-Ag（68.8Ag-26.7Cu-4.5Ti;mass fraction,%） as filler material.The brazed samples were thermal cycled between 30 and 600 ℃ and characterized.X-ray diffraction results show strong reaction between titanium and carbon as well as titanium and alumina.Scanning electron microscopy and helium leak tests show that the initial and thermal cycled brazed samples are devoid of cracks or anv other defects and hermeticity in nature.Brazing strength of the joints is found to be satisfactory.
