Y2O3/Sn-58Bi复合钎料制备及其性能分析

文中通过粉末冶金法制备了Y₂O₃/Sn-58Bi复合钎料.结果表明，添加少量Y₂O₃，对复合钎料熔点影响较小；随着Y₂O₃质量分数提高，复合钎料的密度和显微维氏硬度先升高后降低；复合钎料的润湿角表现出相反的趋势，随着Y₂O₃质量分数提高，复合钎料的润湿角先降低后升高.通过测试Sn-58Bi钎料和0.1%（质量分数）Y₂O₃/Sn-58Bi复合钎料拉伸试样的力学性能发现，添加质量分数为0.1%的Y₂O₃对复合钎料强度稍有提高，但能明显提高复合钎料的延展性，从而解决传统Sn-58Bi钎料较脆的难题.通过观察钎料拉伸断口发现，添加Y₂O₃能够细化复合钎料微观组织，使裂纹沿着断裂方向扩展时受到阻碍，抑制了钎料脆性断裂的趋势.

Preparation and properties of Y2O3/Sn-58Bi composite solders

In the present work, the Y₂O₃/Sn-58Bi composite solders have been prepared by powder metallurgy method. The melting point of the solder was slightly affected by the addition of few amount of Y₂O₃. With the increase of the amount of Y₂O₃, the density and vickers microhardness were firstly increased to the peak value and then decreased with further addition of Y₂O₃, while the contact angle demonstrated the converse tendency. Compared with Sn-58Bi solder, the strength of the composite solder was slightly increased while the ductility was significantly improved after the addition of 0.1 wt.% Y₂O₃, solving the brittle problems of the traditional Sn-58Bi solder. Further observation of the fracture surface indicated that the addition of Y₂O₃ could refine the grain size of the Sn-58Bi and inhabits the propagation of cracks, which improve the ductility of the Sn-58Bi.