直接激光沉积熔体自生氧化铝/钛酸铝复合陶瓷微观组织及力学性能

doi:10.3901/JME.2022.14.212

机械工程学报 ›› 2022, Vol. 58 ›› Issue (14): 212-222.doi: 10.3901/JME.2022.14.212

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直接激光沉积熔体自生氧化铝/钛酸铝复合陶瓷微观组织及力学性能

吴东江, 黄云飞, 赵大可, 牛方勇, 马广义

大连理工大学精密与特种加工教育部重点实验室大连 116024

收稿日期:2021-01-14 修回日期:2021-07-29 出版日期:2022-07-20 发布日期:2022-09-07
通讯作者: 牛方勇(通信作者)，男，1984年出生，博士，副教授，硕士研究生导师。主要研究方向为增材制造与激光制造技术开发。E-mail：niufangyong@dlut.edu.cn
作者简介:吴东江，男，1964年出生，博士，教授，博士研究生导师。主要研究方向为激光精密/微细加工及增材制造技术(激光哈氏合金薄板焊接、铝合金厚板复合焊接以及陶瓷基材料、金属/陶瓷复合功能梯度材料增材制造)。E-mail：djwudut@dlut.edu.cn;黄云飞，男，1995年出生，博士研究生。主要研究方向为陶瓷材料激光增材制造。
基金资助:
国家自然科学基金(51805070，51790172)、辽宁省自然科学基金(2019-ZD-0010，2020-BS-057)、深圳市技术攻关重点(JSGG20210420091802007)和中央高校基本科研业务(DUT19RC(3)060)资助项目。

Microstructure and Mechanical Properties of Melt Growth Alumina/Aluminum Titanate Composite Ceramics Prepared by Directed Laser Deposition

WU Dongjiang, HUANG Yunfei, ZHAO Dake, NIU Fangyong, MA Guangyi

Key Laboratory for Precision and Non-traditional Machining Technology of Ministry of Education, Dalian University of Technology, Dalian 116024

Received:2021-01-14 Revised:2021-07-29 Online:2022-07-20 Published:2022-09-07

摘要/Abstract

摘要： 熔体自生陶瓷因具有接近熔点的超高温性能而成为两机系统热端部件重要的候选高温结构材料之一。熔池凝固条件对熔体自生陶瓷的微观组织及力学性能影响显著，而工艺条件则是调控凝固条件的重要手段。然而，目前关于工艺条件对直接激光沉积熔体自生陶瓷影响规律的研究尚不充分。为此，利用该技术制备了熔体自生Al₂O₃/Al₆Ti₂O₁₃陶瓷，研究了层间提升量对Al₂O₃/Al₆Ti₂O₁₃陶瓷成形质量的影响。结果表明，凝固陶瓷主要由α-Al₂O₃和Al₆Ti₂O₁₃相组成，占主要体积分数的α-Al₂O₃相弥散分布于连续的Al₆Ti₂O₁₃基体相中。由于凝固条件的改变，α-Al₂O₃相尺寸随层间提升量的增加逐渐降低且其形态逐渐由胞状枝晶向等轴枝晶转变。层间提升量处于0.4～0.6 mm范围内时凝固陶瓷具备精细的微观组织及优异的综合性能，是较好的工艺窗口。

关键词: 直接激光沉积, Al₂O₃/Al₆Ti₂O₁₃复合陶瓷, 层间提升量

Abstract: Because of its ultra-high temperature properties close to melting point, melt growth ceramics (MGCs) has become one of the important candidate structural materials for hot end components of two machine system. The solidification conditions of molten pool have notable effects on the microstructure and mechanical properties of MGCs, and the process conditions are important means to control the solidification conditions. However, the effects of process conditions on the directed laser deposition (DLD) MGCs have not been fully studied. Hence, Al₂O₃/Al₆Ti₂O₁₃ MGCs were prepared by DLD technology. The shaping quality of MGCs was studied as a function of layer increment. Results show that the MGCs were mainly composed of α-Al₂O₃ and Al₆Ti₂O₁₃ phases. The α-Al₂O₃, which accounts for the main volume fraction, was dispersed in the continuous Al₆Ti₂O₁₃ matrix. Due to the change of solidification conditions, the size of α-Al₂O₃ decreased with increasing layer increment, and its morphology gradually transformed from cellular dendrites into equiaxed dendrites. The MGCs have fine microstructure and excellent comprehensive properties within the range of 0.4- 0.6 mm of layer increment, which is a preferred process window.

Key words: directed laser deposition, Al₂O₃/Al₆Ti₂O₁₃ composite ceramics, layer increment

中图分类号:

TF124

吴东江, 黄云飞, 赵大可, 牛方勇, 马广义. 直接激光沉积熔体自生氧化铝/钛酸铝复合陶瓷微观组织及力学性能[J]. 机械工程学报, 2022, 58(14): 212-222.

WU Dongjiang, HUANG Yunfei, ZHAO Dake, NIU Fangyong, MA Guangyi. Microstructure and Mechanical Properties of Melt Growth Alumina/Aluminum Titanate Composite Ceramics Prepared by Directed Laser Deposition[J]. Journal of Mechanical Engineering, 2022, 58(14): 212-222.

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直接激光沉积熔体自生氧化铝/钛酸铝复合陶瓷微观组织及力学性能

Microstructure and Mechanical Properties of Melt Growth Alumina/Aluminum Titanate Composite Ceramics Prepared by Directed Laser Deposition

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