摘要:
为了实现铝合金和不锈钢的钎焊连接,对不锈钢进行铝离子注入前处理.注入电压为40 kV,注入剂量分别为3×1017,6×1017,9×1017离子数/cm2.分析了注铝不锈钢表面化学状态,评价了BAl88Si钎料在注铝不锈钢及未注铝不锈钢表面的润湿铺展能力.结果表明,注铝不锈钢表面为Al和Fe元素共存;温度为600,610℃时,钎料在未注铝不锈钢表面不能润湿附着,温度为650℃时钎料在未注铝不锈钢表面润湿性提高,润湿角约为40°.不锈钢表面经过铝离子注入前处理后,钎料润湿性能提高.当注入电压为40 kV、注入剂量为9×1017离子数/cm2时,温度在600℃下BAl88Si钎料在注铝不锈钢表面即可实现有效润湿,润湿角在20°左右,可以满足钎焊需要.
Abstract:
MEVVA ion source was used to implant Al directly into stainless steel to improve the wettability of the filler metal. The surface chemical composition of the implanted layer was characterized by X-ray photoelectron spectroscopy(XPS). The wettability of BAl88Si on stainless steels was investigated by metallographic microscope and scanning electron microscope(SEM). Aluminum was observed within the top surface of stainless steel after ion implantation. BAl88Si did not wet on unmodified stainless steel at 600℃ and 610℃. If the temperature was elevated to 650℃,the BAl88Si solder demonstrated some wettability on unmodified stainless steel with the wetting angle of over 40°. Al ion implantation plays an important role on the improvement of wettability. With implantation dose of 9×1017 ions/cm2 and the extraction voltage of 40 kV,BAl88Si exhibits good wettability on implanted samples,even at 600℃. A wetting angle of about 20° was achieved and satisfied the brazing demand of aluminum onto stainless steel.
百度学术
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