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中文摘要：
研制一种适合钎焊立方氮化硼与45钢异质材料的新型高温BCu80Ni5SnTi活性钎料,采用SEM、EDS及XRD对BCu80Ni5SnTi系活性钎料的微观组织及钎焊接头力学性能进行研究。结果表明：适合钎焊c-BN的活性钎料成分为Cu78～81Ni5～6Sn3～5.5Ti10～12（质量分数,%）,固相线温度为858.4℃,液相线温度为874.8℃;钎料组织由α-Cu固溶体、Ni固溶体、Cu-Sn共晶及少量Cu4Ti3、Cu3Ti2、Cu3Sn、CuSn和Ni17Sn3等化合物组成;该钎料对c-BN的润湿性较好,润湿角为28°～30°,钎焊c-BN与45钢的接头强度为210～230MPa;新型钎料钎焊冶金特性较好,钎焊接头界面实现冶金结合。
英文摘要：
A new-type BCu80Ni5SnTi filler metal suitable for brazing cubic boron nitride（c-BN） and 45 steel was prepared.The microstructures of BCu80Ni5SnTi active filler metal and mechanical properties of the joints of c-BN and 45 steel brazed with BCu80Ni5SnTi filler metal were analyzed by SEM,EDS and XRD.The results show that the solidus and liquidus temperatures of the novel BCu78-81Ni5-6Sn3-5.5Ti10-12（mass fraction,%） active filler metal are 858.4 and 874.8 ℃,respectively.The microstructure of the filler metal mainly consists of α-Cu solid solution,Ni solid solution,Cu-Sn eutectic phase as well as a little Cu4Ti3,Cu3Ti2,Cu3Sn,CuSn and Ni17Sn3 compounds.The wettability of the filler metal on c-BN is good and the contact angle is about 28°-30°.The shear strength of the brazed joint between c-BN and 45 steel using this active filler metal reaches 210-230 MPa.The new-type BCu78-81Ni5-6Sn3-5.5Ti10-12（mass fraction,%） active filler metal possesses better brazing metallurgy characteristics.Chemical metallurgic joining forms in the interface between c-BN grits and BCu80Ni5SnTi active filler metal.
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