Cheng Zhan, Wang Meng, Wang Bo, Zhang Lei, Zhu Ting, Li Ningbo, Zhou Jifa, Jia Fei
Ningbo Intelligent Machine Tool Research Institute Co., Ltd., China National Machinery Institute Group, Ningbo 315700, China.
College of Mechanical & Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China.
Materials (Basel). 2024 Nov 11;17(22):5494. doi: 10.3390/ma17225494.
A Babbitt alloy SnSb11Cu6 with 0-2.0 wt.% Co was synthesized using the induction melting process. This study examined the effect of cobalt (Co) on the microstructure, tensile properties, compressive properties, Brinell hardness, and wear properties of SnSb11Cu6 using optical microscopy (OM), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), a universal tensile testing machine, a Brinell hardness tester, and a wear testing machine. The results indicate that the optimal quantity of Co can enhance the microstructure of the Babbitt alloy and promote microstructure uniformity, with presence of CoSn in the matrix. With the increase in Co content, the tensile and compressive strength of the Babbitt alloy first increased and then decreased, and the Brinell hardness gradually increased with the increase in Co content. The presence of trace Co has a minimal effect on the dry friction coefficient of the Babbitt alloy. When the Co content exceeds 1.5 wt.%, the friction properties of the Babbitt alloy deteriorate significantly. The optimized Babbitt alloy SnSb11Cu6-1.5Co was subsequently fabricated into wires, followed by conducting cold metal transfer (CMT) surfacing experiments. The Co element can promote the growth of interfacial compounds. The microstructure at the interface of the Babbitt alloy/steel is dense, and there is element diffusion between it. The metallurgical bonding is good, and there are serrated compounds relying on the diffusion layer to extend to the direction of the additive layer with serrated compounds extending and growing from the diffusion layer to the additive layer. Overall, Babbitt alloys such as SnSb11Cu6 exhibit improved comprehensive properties when containing 1.5 wt.% Co.
采用感应熔炼工艺合成了含0-2.0 wt.%钴的巴氏合金SnSb11Cu6。本研究使用光学显微镜（OM）、扫描电子显微镜（SEM）、能量色散X射线光谱仪（EDS）、X射线衍射仪（XRD）、万能拉伸试验机、布氏硬度计和磨损试验机，研究了钴（Co）对SnSb11Cu6的微观结构、拉伸性能、压缩性能、布氏硬度和磨损性能的影响。结果表明，最佳钴含量可以改善巴氏合金的微观结构，促进微观结构均匀性，基体中存在CoSn。随着钴含量的增加，巴氏合金的拉伸和压缩强度先增加后降低，布氏硬度随钴含量的增加而逐渐增加。微量钴的存在对巴氏合金的干摩擦系数影响最小。当钴含量超过1.5 wt.%时，巴氏合金的摩擦性能显著恶化。随后将优化后的巴氏合金SnSb11Cu6-1.5Co制成线材，进行冷金属过渡（CMT）堆焊实验。钴元素可以促进界面化合物的生长。巴氏合金/钢界面处组织致密，存在元素扩散。冶金结合良好，有锯齿状化合物依靠扩散层向堆焊层方向延伸，锯齿状化合物从扩散层向堆焊层延伸并生长。总体而言，含1.5 wt.%钴的SnSb11Cu6等巴氏合金综合性能得到改善。
