Binder jetting 3D printing (BJ3DP) is an emerging technology that can enable the production of tungsten heavy alloy (WHA) parts of great geometric complexity. Despite its promise, the industrial use of BJ3DP is today hindered by two shortcomings: (i) Printed parts have low strength in the as-cured state, and (ii) the mechanical properties of the sintered parts are poor when sintered using standard sintering practice.

This study was carried out to address those shortcomings. We introduce a new WHA powder for BJ3DP and compare it to existing powders [1]. Physical properties (flow, apparent density, size distribution) and the green strength after BJ3DP are reported.

Sintering and microstructural evolution differences between the new WHA powder, existing WHA powders for BJ3DP and conventional press-and-sinter WHA powders were investigated. Good densification during the early stages of sintering enabled the sintering of the new powder to full density. After sintering, mechanical properties of the printed specimens were evaluated and compared to the properties of cold isostatically pressed WHA specimens using conventional powder blends with similar chemistry.

The new powder has superior green strength in the as-printed condition and is therefore a better candidate for the manufacturing of complex parts. It also sinters much faster than currently available powders and achieves mechanical properties that match those of conventionally processed WHA.

粘合剂喷射 3D 打印 (BJ3DP) 是一种新兴技术，可以生产几何复杂度很高的钨合金 (WHA) 零件。尽管前景广阔，但如今 BJ3DP 的工业应用受到两个缺点的阻碍：(i) 印刷部件在固化状态下强度低，以及 (ii) 使用标准烧结实践烧结时，烧结部件的机械性能较差.

进行这项研究是为了解决这些缺点。我们为 BJ3DP 引入了一种新的 WHA 粉末，并将其与现有粉末进行比较 [1]。报告了 BJ3DP 后的物理性能（流动性、表观密度、尺寸分布）和生坯强度。

研究了新型 WHA 粉末、现有 BJ3DP 用 WHA 粉末和传统压制烧结 WHA 粉末之间的烧结和微观结构演变差异。在烧结的早期阶段良好的致密化使新粉末能够烧结至全密度。烧结后，对打印样品的机械性能进行评估，并将其与使用具有类似化学成分的常规粉末混合物的冷等静压 WHA 样品的性能进行比较。

新粉末在印刷状态下具有优异的生坯强度，因此更适合制造复杂零件。它的烧结速度也比目前可用的粉末快得多，并达到与传统加工的 WHA 相匹配的机械性能。