Abstract
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.
摘要
本文通过 3D 墨水打印方法制备 Ti-TiB 微点阵材料,研究 TiH2 +TiB2 墨水原位生成 Ti-TiB 复合材料的烧结性能。在 Ar 中分别进行 1050~1200 °C,4 h~24 h 的无压烧结,通过研究 Ti-TiB 复合材料的收缩率、晶粒尺寸、显微硬度、XRD 以及组织演变,研究了 TiH2 +TiB2 墨水在致密化过程中的烧结动力学。结果表明:烧结温度比烧结时间对 Ti-TiB 复合材料的致密度具有更显著的影响,由柯肯德尔效应和不可扩散的气体引起两类微孔形状,分别为不规则和球形;原位生成的 TiB 以分离的 TiB 晶须(针状)或 TiB 晶须簇的形式存在。本研究有助于微孔的设计与控制,也适合制备添加高体积分数 TiB的 Ti-TiB 复合材料或其他复合材料。
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SONG Bin-na thanks Dr. Christoph KENEL and Prof. David C. DUNAND for providing access to experimental setups at Northwestern University and useful discussion and input.
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SONG Bin-na provided the concept, funding acquisition, wrote, reviewed, edited the draft of manuscript. CAO Jian edited the draft of manuscript.
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SONG Bin-na and CAO Jian declare that they have no conflict of interest.
Foundation item: Project(201806920003) supported by the China Scholarship Council; Project(172180) supported by the Swiss National Science Foundation; Projects(ECCS-1542205, DMR-1720139) supported by the National Natural Science Foundation, USA
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Song, Bn., Cao, J. Sintering properties of in situ Ti-TiB microlattices created by 3D extrusion printing of TiH2+TiB2 inks. J. Cent. South Univ. 28, 1078–1088 (2021). https://doi.org/10.1007/s11771-021-4681-2
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DOI: https://doi.org/10.1007/s11771-021-4681-2