A direct 3D extrusion printing technique was used to produce Ti-TiB filaments and microlattices. The sintering properties of 3D ink extrusion and sintering of in situ Ti-TiB composite structures made from TiH₂+TiB₂ ink were investigated. The sintering kinetics of TiH₂+TiB₂ inks was studied during densification by pressureless sintering at 1050–1200 °C for 4–24 h in Ar. The linear shrinkage, grain size, microhardness, X-ray diffraction (XRD) patterns, and microstructural evolution of the Ti-TiB composite were studied. The sintering temperature had a more pronounced influence than the sintering time on the density of the Ti-TiB composite. There were two kinds of pores, irregular and spherical, caused by the Kirkendall effect and indiffusable gases. The TiB formed by in situ synthesis existed as either separated TiB whiskers (needle-like shapes) or clusters of TiB whiskers. The results of this work could be useful for controlling microporosity through incomplete sintering within filaments, especially for the production of in situ Ti-TiB with high volume fractions of TiB or other composites.

直接3D挤出打印技术用于生产Ti-TiB长丝和微晶格。研究了3D油墨挤出的烧结性能和由TiH ₂ + TiB ₂油墨制成的原位Ti-TiB复合结构的烧结。TiH ₂ + TiB ₂的烧结动力学致密化期间，通过在Ar中1050–1200°C进行4-24 h的无压烧结研究了这种油墨。研究了Ti-TiB复合材料的线性收缩率，晶粒尺寸，显微硬度，X射线衍射（XRD）图案以及组织演变。烧结温度比烧结时间对Ti-TiB复合材料的密度具有更显着的影响。由柯肯德尔效应和不可扩散的气体引起的孔有两种，不规则的和球形的。通过原位合成形成的TiB以分离的TiB晶须（针状形状）或TiB晶须簇的形式存在。这项工作的结果可能有助于通过在丝内进行不完全烧结来控制微孔，特别是用于生产具有高体积分数的TiB或其他复合材料的原位Ti-TiB。