激光双面区熔Al2O3/Y3Al5O12共晶自生复合陶瓷的制备与表征

doi:10.3724/SP.J.1077.2012.11627

无机材料学报 ›› 2012, Vol. 27 ›› Issue (8): 843-848.DOI: 10.3724/SP.J.1077.2012.11627 CSTR: 32189.14.SP.J.1077.2012.11627

激光双面区熔Al₂O₃/Y₃Al₅O₁₂共晶自生复合陶瓷的制备与表征

于建政, 张军, 苏海军, 宋衎, 刘林, 傅恒志

(西北工业大学凝固技术国家重点实验室, 西安710072)

收稿日期:2011-10-10 修回日期:2011-12-13 出版日期:2012-08-20 网络出版日期:2012-07-09
作者简介:于建政(1985-), 男, 硕士研究生. E-mail: yjznpu@yahoo.cn
基金资助:
国家自然科学基金(51002122, 50772090); 陕西省自然科学基金(2010JQ6005); 航空科学基金(2010ZF53064); 西北工业大学基础研究基金(G9KY1016); 中国博士后科学基金(2012M510218); 凝固技术国家重点实验室自主课题(76-QP-2011)

Fabrication and Characterization of Al₂O₃/Y₃Al₅O₁₂ Eutectic in situ Composite Ceramics by Double Side Laser Zone Remelting Method

YU Jian-Zheng, ZHANG Jun, SU Hai-Jun, SONG Kan, LIU Lin, FU Heng-Zhi

(State Key Laboratory of Solidifcation Processing, Northwestern Polytechnical University, Xi’an 710072, China)

Received:2011-10-10 Revised:2011-12-13 Published:2012-08-20 Online:2012-07-09
About author:YU Jian-Zheng.
Supported by:
National Natural Science Foundation of China (51002122, 50772090); Provincial Natural Science Foundation of Shaanxi Province (2010JQ6005); Aeronautical Science Foundation of China (2010ZF53064); NPU Foundation for Fundamental Research (NPU-FFR-G9KY1016); China Postdoctoral Science Foundation (2012M510218); Research Fund of the State Key Laboratory of Solidification Processing in NWPU (76-QP-2011)

摘要/Abstract

摘要： 采用激光区熔凝固技术制备大尺寸Al₂O₃/Y₃Al₅O₁₂(YAG)共晶自生复合陶瓷, 考察双面区熔条件下大尺寸氧化物共晶陶瓷的熔化及凝固成形规律, 采用扫描电镜、能谱和X射线衍射对其凝固组织特征进行了表征和分析. 研究结果表明:在优化的凝固工艺下, 激光双面区熔增加了熔凝层的厚度, 获得了熔凝层厚度8.2 mm, 长度65.0 mm, 致密度达98.5%±1%的Al₂O₃/YAG共晶陶瓷; 共晶熔凝层厚度随激光扫描速率的减小而增加, 随激光功率的增大而增大, 并且致密度随着激光功率的增大呈现先增大后减小的趋势; 双面区熔后的Al₂O₃/YAG共晶陶瓷微观组织由均一分布、相互交织的Al₂O₃和YAG共晶相组成, 共晶层片间距较小(1.0~3.5 μm), 且与凝固速度满足Jackson-Hunt公式; 共晶间距随扫描速率的增大逐渐减小; 双面区熔界面处共晶组织生长具有连续性, 界面结合良好; 共晶陶瓷的Vickers硬度为(18.6±1.0) GPa.

关键词: Al₂O₃/YAG, 共晶陶瓷, 激光双面区熔, 制备, 表征

Abstract: Al₂O₃/YAG eutectic in situ composite ceramics were prepared by double side laser zone remelting (DSLZR) with aiming at investigate the melting and solidification rules of oxide eutectic ceramics with large size under DSLZR condition. The solidification microstructures were characterized by SEM, XRD and EDS. The results show that solidified layer thickness of eutectic ceramics is enhanced by DSLZR. The eutectic ceramic plates with density up to 98.5%±1% are obtained, in which the thickness is 8.2 mm, and the length is 65.0 mm. The thickness of solidified layer is increased with decreasing laser scanning rate and increasing laser power. The density is initially increased and then decreased with the increase of laser scanning rate. The eutectic ceramic obtained by DSLZR is only consisted of uniform and interweaved Al₂O₃ and YAG phases. The relation between the eutectic spacing (λ; only 1.0~3.5 μm) and solidification rate (v) agrees with the Jackson-Hunt formula. With the increase of laser scanning rate, the eutectic spacing reduces. Furthermore, the growth of eutectic at double side remelting interface is continuous, so the binded interface is very well. The eutectic ceramic obtained has high Vickers hardness ((18.6±1.0) GPa) due to the fine solidification microstructure.

Key words: Al₂O₃ /YAG, eutectic composite, laser zone remelting, preparation, characterization

中图分类号:

TQ174

于建政, 张军, 苏海军, 宋衎, 刘林, 傅恒志. 激光双面区熔Al₂O₃/Y₃Al₅O₁₂共晶自生复合陶瓷的制备与表征[J]. 无机材料学报, 2012, 27(8): 843-848.

YU Jian-Zheng, ZHANG Jun, SU Hai-Jun, SONG Kan, LIU Lin, FU Heng-Zhi. Fabrication and Characterization of Al₂O₃/Y₃Al₅O₁₂ Eutectic in situ Composite Ceramics by Double Side Laser Zone Remelting Method[J]. Journal of Inorganic Materials, 2012, 27(8): 843-848.

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激光双面区熔Al₂O₃/Y₃Al₅O₁₂共晶自生复合陶瓷的制备与表征

Fabrication and Characterization of Al₂O₃/Y₃Al₅O₁₂ Eutectic in situ Composite Ceramics by Double Side Laser Zone Remelting Method

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