Fabrication and Characterization of Al2O3/Y3Al5O12 Eutectic in situ Composite Ceramics by Double Side Laser Zone Remelting Method
Source abstract
Abstract
采用激光区熔凝固技术制备大尺寸Al 2 O 3 /Y 3 Al 5 O 12 (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Al 2 O 3 /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Al 2 O 3 /YAG共晶陶瓷微观组织由均一分布、相互交织的Al 2 O 3 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.
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Research context
OpenAlex topics: Laser Material Processing Techniques · Glass properties and applications · Building materials and conservation
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References (19)
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