Adiabatic temperature calculation and microstructure of W-Cu alloy fabricatedby combustion synthesis infiltration technique under ultra-gravity field

作者：Sun Xiang Ming; Song Yue Peng^*; Gao Dong Sheng; Li Jiang Tao; Chen Yi Xiang; Guo Shi Bin

来源：Transactions of Materials and Heat Treatment, 2013, 34(6): 158-162.

• Adiabatic temperature
• Computer calculation
• Functionally gradient materials
• Infiltration techniques
• Self-propagating high temperature synthesis
• Self-propagating reaction
• Structure and microstructures
• W-Cu alloys

The adiabatic temperature of CuO/Al thermit was calculated through computer programing based on the theory of thermodynamics. With considering to the vaporization enthalpy, the calculated adiabatic temperature reaches 2846 K for the boiling temperature of Cu product with partial gas phase about 52.9% molar fraction. When adding W powder more than 30% mass fraction in CuO/Al thermit, lower than 1800 K of adiabatic temperature is observed, which indicatee that it is impossible of self-propagating reaction. Combined with the infiltration technique, functionally gradient material of W-Cu alloy is prepared by self-propagating high-temperature synthesis under ultra-gravity field. Further examination indicates that the same phase structure and microstructure are obtained for W-Cu alloy fabricated by this approach compared with the W-Cu alloy prepared by traditional sintering methods. The synthesis mechanism is also primarily analyzed and discussed.

• 出版日期2013