(华中科技大学 塑性成形模拟及模具技术国家重点实验室, 武汉 430074)
摘 要: 采用选择性激光烧结和金属直接氧化法相结合的技术， 制备SiC-Al2O3-Al陶瓷基复合材料零件。 研究选择性激光烧结成形碳化硅零件坯体的工艺和脱脂预处理工艺对坯体孔隙率的影响规律， 以及氧化入渗工艺影响因素； 采用扫描电镜、 X射线衍射仪分别对成形好的复合材料进行微观形貌和物相分析。 结果表明： 用选择性激光烧结和金属直接氧化技术相结合的工艺可以直接利用三维图形， 快速成形出复杂形状的SiC-Al2O3-Al复合材料零件； 其陶瓷相和金属相都呈三维网络状分布， SiC、 Al2O3和金属相的体积分数分别为45.1%、 32.7%和18.0%， 孔隙率为4.2%， 抗弯强度为361.2 MPa。
关键字: 选择性激光烧结； 金属直接氧化； SiC-Al2O3-Al； 陶瓷基复合材料
（State Key Laboratory of Plastic Forming Simulation and Die and Mould Technology, Huazhong University of Science and Technology,
Wuhan 430074, China）
Abstract: SiC-Al2O3-Al ceramic matrix composite parts with complex shape can be produced by combination of selective laser sintering(SLS) and directed oxidation of metals (DIMOX). The factors affecting SLS process such as debinding and post-processing of high temperature sintering on open porosity of SiC preform were discussed, the affecting factors of DIMOX process were also studied. The microstructures of the composites were investigated using X-ray diffraction and scanning electron microcopy. The result indicates that three-dimensional objects of SiC-Al2O3-Al ceramic matrix composites can be produced successfully from their CAD models directly by combination of SLS and DIMOX. The ceramic and metals form three dimensional networks. There are 45.1% SiC, 32.7% Al2O3, 18.0% Al and 4.2% porosity in the material, and its bending strength is 361.2 MPa.
Key words: selective laser sintering; directed oxidation of metal; SiC-Al2O3-Al; ceramic matrix composite
