钛热交换器的真空钎焊

Vacuum Brazing of Titanium Heat Exchangers

研究了不同的钎料成分和使用形式、钎焊间隙、钎焊温度和保温时间对TA2纯钛钎焊接头的成形和钎缝组织形态的影响。试验结果表明,与用纯Cu钎料相比,用Ti-Zr-Ni-Cu钎料可以更容易得到好的等温凝固钎缝组织。而用纯Cu钎料,则价格低,也可得到致密的成形漂亮的钎焊接头,但代价是接头的塑性较低。

Vacuum brazing process of CP Ti- tanium TA2 heat exchangers was investigated. The effect of filler metals composition, use form, clearance, braz- ing temperature and hold time on braze joint forming and microstructure was studied. The test results showed that desirable isothermal-solidified braze microstructure can be produced more easily by use of Ti-Zr-Ni-Cu filler metals than pure copper filler metal when vacuum brazing tita- nium. Whereas low price pure copper rolled foil as filler metal for brazing titanium can also result in tight and good look brazed joints, but at the cost of low plasticity of joints.