采用扫描电镜、XRD等分析手段对有油和无油轧制后的银基钎料进行研究。结果表明，有油轧制的钎料会在其表面残留一层含碳层，含碳层的厚度约为3～7μm；所选银钎料的主要的相组成为CuZn、AgCd、（ Ag，Cu）5 Zn8、AgCd19等，碳在钎料表面主要以游离的碳分子和ZnC8、C2 CdO4形式存在；钎料表面的含碳层在钎料熔化后将以三种不同的形式存在，部分碳分子来不及上浮到表面而被包裹在钎料内部；部分碳分子随着钎料的熔化铺展，被液态钎料推到了铺展的最前沿，在液态钎料周围形成一个包围圈；还有一部分形成含碳的复杂化合物，其存在都将明显降低钎料对钢基体的润湿性，影响后续的焊接强度等。
Silver based brazing filler metal with different rolling technology were researched using scanning electron microscopy, XRD, et al. The results showed that the carbon?containing layer about 3~7 μm was left in the surface of rolled brazing filler metal with oil. The type of carbon mainly in the solder surface are molecules, free carbon, ZnC8 and C2 CdO4 . The main phases of silver based filler metal selected consist of CuZn, AgCd, (Ag,Cu)5Zn8, AgCd19, et al. There are three existing forms for surface carbon?containing layer. Some carbon molecules which are wrapped inside the brazing filler metals have no enough time to rise to surface. Some carbon molecules float with the melt of brazing filler metal to the brazing filler metal around, and then they are pushed to the spreading forefront of liquid brazing filler metal forming an annular ring. Some complicated carbides such as C2 CdO4 having low wettability in the 316LD clean steel will affect the subsequent brazed strength significantly.
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