摘要
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 TiH_(2)+TiB_(2) ink were investigated.The sintering kinetics of TiH2+TiB2 inks was studied during densification by pressureless sintering at 1050−1200℃ 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.
本文通过3D墨水打印方法制备Ti-TiB微点阵材料,研究TiH_(2)+TiB_(2)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℃,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TiH_(2)+TiB_(2)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。
作者
SONG Bin-na
CAO Jian
宋滨娜;曹健(School of Iron and Steel,Soochow University,Suzhou 215131,China;Department of Materials Science and Engineering,Northwestern University,2220 Campus Drive,Evanston,IL 60208,USA)
基金
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。
