以“三明治”结构的钛箔/镍箔/钛箔为中间层材料，采用部分瞬间液相（PTLP）连接方法在1 000℃保温不同时间（1～4 h）制备了YG10硬质合金/40Cr钢异质金属接头，研究了保温时间对接头微观形貌、物相组成和剪切强度的影响。结果表明：接头为由YG10硬质合金/TiC+WC/Co-Ni-Ti/Ni₃Ti/镍层/Ni₃Ti/NiTi/TiC/40Cr钢组成的多层结构，硬质合金和镍层以及钢和镍层之间均形成了宽35~50 μm的过渡层；当保温时间从1 h延长到4 h时，接头过渡层中的微观缩孔数量减少，过渡层厚度增加，接头剪切强度先增大后减小；当保温时间为2 h时，接头剪切强度最高，为153 MPa。

The sandwich structural titanium foil/nickel foil/titanium foil were used as interlayer materials, and then the dissimilar metal joint of YG10 cemented carbide and 40Cr steel was prepared by partial transient liquid phase (PTLP) bonding at 1 000℃ for different dwelling times (1-4 h). The effects of dwelling time on the micromorphology, phase composition and shear strength of the joint were investigated. The results show that the joint had a multilayer structure composed of YG10 cemented carbide/TiC+WC/Co-Ni-Ti/Ni₃Ti/nikle layer/Ni₃Ti/NiTi/TiC/40 Cr steel, and a transition layer with width of 30-50 μm was formed between cemented carbide and nickle layer, and between steel and nickle layer, respectively. When the dwelling time increased from 1 h to 4 h, the amount of microcavities in the transition layer of the joint decreased, the thickness of the transition layer increased, and the shear strength of the joint increased first and then decreased. After dwelling for 2 h, the shear strength of the joint reached the largest value of 153 MPa.