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论文类型：期刊论文

发表时间：2019-02-15

发表刊物：CERAMICS INTERNATIONAL

收录刊物：SCIE

卷号：45

期号：3

页面范围：4119-4122

ISSN号：0272-8842

关键字：Laser additive manufacturing; Water-cooled substrate; Microstructure; Mechanical properties

摘要：The Al2O3-YAG eutectic ceramic was prepared by laser additive manufacturing on the substrate without water cooling and with water cooling, respectively. Furthermore, the temperature distribution, microstructure, phase structure, microhardness and fracture toughness of the deposited ceramic were investigated. The results indicated that the peak temperature on the water-cooled substrate decreased, and the cooling rate increased to 300 times compared to that without water cooling. Compared to the microstructure in the sample without water cooling, the microstructure in the sample with water cooling changed from the network structure to colony and dendrite structure, and the average eutectic spacing was reduced by 78.1%, and the plane (2130) diffraction intensity of Al2O3 was enhanced, which was beneficial to reduce the dislocation accumulation. Also, under the water-cooled condition, the microhardness of Al2O3-YAG increased about 10.6%, to 21.50 +/- 2.70 GPa, and the fracture toughness increased 8.5%, to 5.86 +/- 1.11 MPa m(1/2), compared to those without water cooling.