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采用同轴输送Al2O3–Y2O3粉末激光近净成形方法进行复合陶瓷薄壁件成形实验,使用扫描电子显微镜,X射线衍射及电子探针显微分析仪对成形薄壁样件微观组织、物相组成及元素含量进行检测,通过压痕法测量样件显微硬度与断裂韧性。结果表明:同轴输送Al2O3–Y2O3粉末激光近净成形可得到Al2O3–YAG复合陶瓷件,主要由α-Al2O3和YAG两相组成,但同时存少量亚稳态YAP或YAM相;薄壁样件内部主要由粗大的富YAG初生相和Al2O3/YAG交错生长的网状共晶组织组成,成形过程中Al2O3较易挥发,不同高度位置重熔次数影响Al相对挥发量,导致两相比例不同,由顶部到底部,富YAG初生相尺寸和比例增大,成形过程中,高温促使亚稳相向YAG转化加剧这一现象;压痕法测量样件显微硬度为16 GPa,断裂韧性为2.89 MPa·m1/2,说明该方法可得到性能较好的陶瓷件。
Abstract：Thin-wall ceramics were built by Laser engineered net shaping(LENS) with coaxial feeding Al2O3–Y2O3 powder.The microstructure,phase and element of the sample were characterized by scanning electron microscopy,X-ray diffraction and electron probe microanalysis,respectively.The microhardness and fracture toughness of the sample were examined via indentation tests.The results show that the Al2O3–YAG composite ceramics can be built directly by LENS with coaxial feeding Al2O3-Y2O3 powder.The ceramics are mainly composed of Al2O3 and YAG phases with a little metastable phase-YAP or YAM.The microstructure of the sample is composed of rich YAG primary phase and Al2O3/YAG eutectic organization.As Al2O3 is volatile,the melting times of different heights in the sample affect the relative volatilization of Al,leading to the different ratios of the two phase at different points,and the size and proportion of rich YAG primary phase increase from top to bottom.Besides,the high temperature of the sample in the process makes the metastable phase transforming to YAG,exacerbating the increase of rich YAG phase.The sample built by LENS has a good performance,i.e.,the microhardness of 16 GPa and the fracture toughness of 2.89 MPa·m1/2.
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基本信息:
DOI：10.14062/j.issn.0454-5648.2015.06.06
中图分类号:TQ174.1
引用信息:
[1]吴东江,王江田,牛方勇,等.激光近净成形Al_2O_3–YAG复合陶瓷薄壁件微观组织与力学性能分析[J].硅酸盐学报,2015,43(06):741-746.DOI:10.14062/j.issn.0454-5648.2015.06.06.
基金信息:
国家自然科学基金(51175061,51402037);; 博士后基金(2014M551072)资助
2015-06-03
2015-06-03
2015-06-03