Preparation and Welding Properties of Amorphous Ni-Mo-P Filler Metal
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摘要: 利用单辊极冷法制备了Ni78Mo14P8非晶合金钎料带, 采用XRD和DSC分析了钎料的物相组成和熔化特性, 并将其用于不同温度下(975, 1 000, 1 025, 1 050 ℃)不锈钢和20碳钢的瞬时液相焊, 对钎焊接头的抗剪强度和显微组织进行了分析。结果表明: 该镍钼磷钎料为单一的非晶态相, 其约化玻璃转变温度参数为0.54, 过冷液体区间为41 ℃, 具有良好的非晶形成能力; 随着钎焊温度升高, 钎焊接头的抗剪强度与焊缝区显微硬度都逐渐增大; 焊缝区的主要组织为FeNi固溶体和Mo2Ni6P3、Ni3P、Ni2P化合物组成的共晶组织。Abstract: The Ni78Mo14P8 amorphous alloy filler metal ribbon was prepared by single roller rapid solidification. The phase of filler metal was investigated by XRD, and the melting behaviour was investigated by DSC. The amorphous ribbon was used in transient liquid phase bonding between stainless steel and 20 carbon steel at 975, 1 000, 1 025, and 1 050 ℃. The shear strength and microstructure of the soldered joint was analyzed. The results show that the phase of Ni-Mo-P filler metal was single amorphous, the reduced glass transition temperature(trg) of Ni78Mo14P8 amorphous alloy was 0.54, and the supercooled liquid range (Δtx) was 41 ℃, indicating good amorphous formation ability. As brazing temperature increased, the shear strength of the brazed joint and the micro-hardness of the solder area also increased gradually. The microstructure of solder seam was FeNi solid solution phase and eutectic organization consisting of Mo2Ni6P3, Ni3P and Ni2P.
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