Wc composite cladding high temperature service is an effective protective coating to reduce wear. In this paper,based on the BNi-2 solder powders,the addition of rare earth elements Lanthanum and cerium,and mechanical alloy technology were used to prepare the solder powders. Wc composite cladding is fabricated on the Q235 steel by infiltration brazed technology in a vacuum furnace. The morphologies of tungsten carbide composite cladding were observed by SEM. Effect of Lanthanum and cerium on the weld-ing properties of the Ni-based solder alloys was analyzed. The results show that after rare earth element 0. 1 Wt.% La and 0. 05 Wt.% ce were added in the BNi-2 alloy,and combined with mechanical alloy technology,the nickel based solder BNi-2 alloy powders have good wettability with parent material. The welding performance of this BNi-2 alloy powders has been improved. Wc composite coating with a good interface can be fabricated by this solder and infiltration brazed technology.%碳化钨（ Wc）复合涂层是一种高温下使用的有效耐磨蚀保护涂层.在BNi-2钎料粉末中添加稀土粉末，用机械合金化技术制备了改进的BNi-2钎料粉末，并在Q235钢基体上制备了碳化钨复合涂层；采用SEM观察了涂层显微组织，分析了稀土元素La和ce对钎料焊接性能的影响规律.结果表明，在BNi-2合金中分别加入0.1 Wt.%稀土元素La，0.05 Wt.%稀土元素ce，并采用机械合金化制备的粉状镍基焊料，与母材润湿性良好，焊接性能有所提高.采用此焊料及渗透钎焊技术可以制备出界面结合良好的Wc复合涂层.
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