Direct melt infiltration does not produce sintered closed holes and considerably reduces the time required for preparation compared with pre-sintered WC skeleton followed by melt infiltration of Co. However, it may lead to alloy collapsing and deformation. In this study, WC and Co green parts were prepared via binder jet 3D printing. The two parts were stacked layer by layer then subjected to melt infiltration to prepare a WC–Co series of cemented carbides. The aim was to investigate the shape retention, infiltration conditions, and properties of the alloy after the equal distribution of Co and the direct infiltration of the Co melt into the WC green parts without pre-sintering. The effect of different Co amounts on the product was also studied. Results showed that the carbide prepared through direct melt infiltration of WC green parts without pre-sintered skeletons displayed excellent shrinkage and properties. The shrinkage of the prepared cemented carbide with a Co content of about 25 wt% was within 3% in all directions. The relative density, hardness, and fracture toughness of the alloy reached 96.65%, 11.5 GPa, and 23.5 Mpa m^1/2, respectively. This work provides a simplified, and high-shape-retention method for other alloys that can be prepared through melt infiltration.

直接熔渗不会产生烧结的封闭孔，与预烧结WC骨架然后熔渗Co相比，大大减少了制备所需的时间。但是，它可能导致合金塌陷和变形。在这项研究中，WC 和 Co 绿色部件是通过粘合剂喷射 3D 打印制备的。将这两个部分逐层堆叠，然后进行熔体渗透以制备 WC-Co 系列硬质合金。目的是研究Co均匀分布后合金的形状保持性、渗透条件和性能，以及Co熔体在没有预烧结的情况下直接渗透到WC生坯中。还研究了不同Co量对产物的影响。结果表明，无预烧结骨架的WC生坯直接熔渗制备的碳化物具有优异的收缩率和性能。制备的Co含量约为25 wt%的硬质合金的收缩在所有方向都在3%以内。合金的相对密度、硬度、断裂韧性分别达到96.65%、11.5 GPa、23.5 Mpa·m^1/2，分别。这项工作为可以通过熔体渗透制备的其他合金提供了一种简化的、高形状保持性的方法。