Sintering properties of in situ Ti-TiB microlattices created by 3D extrusion printing of TiH_(2)+TiB_(2) inks  

TiH_(2)+TiB_(2)墨水3D打印原位生成Ti-TiB微点阵材料的烧结性能

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)

机构地区：[1]School of Iron and Steel,Soochow University,Suzhou 215131,China [2]Department of Materials Science and Engineering,Northwestern University,2220 Campus Drive,Evanston,IL 60208,USA

出　　处：《Journal of Central South University》2021年第4期1078-1088,共11页中南大学学报（英文版）

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。

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。

关 键 词：pressureless sintering Ti-TiB composites MICROPOROSITY 3D extrusion printing 

分 类 号：TB333[一般工业技术—材料科学与工程] TP391.73[自动化与计算机技术—计算机应用技术]