(華中科技大學 塑性成形模擬及模具技術(shù)國家重點實驗室, 武漢 430074)
摘 要: 采用選擇性激光燒結(jié)和金屬直接氧化法相結(jié)合的技術(shù)， 制備SiC-Al2O3-Al陶瓷基復合材料零件。 研究選擇性激光燒結(jié)成形碳化硅零件坯體的工藝和脫脂預處理工藝對坯體孔隙率的影響規(guī)律， 以及氧化入滲工藝影響因素； 采用掃描電鏡、 X射線衍射儀分別對成形好的復合材料進行微觀形貌和物相分析。 結(jié)果表明： 用選擇性激光燒結(jié)和金屬直接氧化技術(shù)相結(jié)合的工藝可以直接利用三維圖形， 快速成形出復雜形狀的SiC-Al2O3-Al復合材料零件； 其陶瓷相和金屬相都呈三維網(wǎng)絡(luò)狀分布， SiC、 Al2O3和金屬相的體積分數(shù)分別為45.1%、 32.7%和18.0%， 孔隙率為4.2%， 抗彎強度為361.2 MPa。
關(guān)鍵字: 選擇性激光燒結(jié)； 金屬直接氧化； SiC-Al2O3-Al； 陶瓷基復合材料
CHENG Di, GUO Ting
（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
