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

doi:10.3901/JME.2022.14.212

Abstract

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

CLC Number:

TF124

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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