【摘要】 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.更多还原

【Abstract】 In the present work,the Y₂O₃/Sn-58 Bi 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-58 Bi 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-58 Bi solder. Further observation of the fracture surface indicated that the addition of Y₂O₃ could refine the grain size of the Sn-58 Bi and inhabits the propagation of cracks,which improve the ductility of the Sn-58 Bi.更多还原