MicrostructureandMechanicalPropertiesofAl2O3/ZrO2DirectionallySolidifiedEutecticCeramicPreparedbyLaser3DPrinting

被引：0

作者：

Zhi Liu ^{[1
]}

Kan Song ^{[2
]}

Bo Gao ^{[1
]}

Tian Tian ^{[1
]}

Haiou Yang ^{[2
]}

Xin Lin ^{[2
]}

Weidong Huang ^{[2
]}

机构：

[1] State Key Laboratory of Military Stomatology, Department of Prosthodontics, School of Stomatology, Fourth Military Medical University

[2] State Key Laboratory of Solidification Processing, Northwestern Polytechnical University

来源：

Journal of Materials Science & Technology | 2016年 / 32卷 / 04期

关键词：

(Al)2O3; ZrO2; Eutectic; Solidification;

D O I：

暂无

中图分类号：

TQ174.6 [生产过程与设备];

学科分类号：

080706 ;

摘要：

Directionally solidified eutectic ceramics such as（Al）2O3/ZrO2 are promising structural materials for applications in harsh environment with an ultrahigh temperature. In this work, through adopting assistant heating laser 3D printing,（Al）2O3/ZrO2eutectic samples were manufactured with suppressing the formation of cracks. The dependence of the average rod spacing（λav） on the scanning rate（V） follows a relation with λav V0.5= 1 μm1.5s–0.5. Typical eutectic microstructures, so-called complex regular, were analyzed with respect to its evolution with modulating the growth conditions. Formation mechanism of the solidification defect, shrinkage porosity, was discussed and the defect is found to be significantly suppressed by optimizing the solidification parameters. The maximum hardness and fracture toughness are measured to be 16.7 GPa and 4.5 MPa m1/2, respectively. The interplay between the propagation of cracks and the （Al）2O3/ZrO2 interface is discussed.

引用

页码：320 / 325

页数：6

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