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-分布、相互交织的Al203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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