摘要：
以喷雾干燥的SiC-Al2O3-Y2O3造粒粉为原料, 使用机械混合法得到复合粉体, 通过激光选区烧结/冷等静压技术并结合液相烧结工艺制备出SiC陶瓷, 对SiC陶瓷的物相组成、显微结构、抗弯强度及密度进行表征.结果表明:喷雾造粒粉平均粒径为39.43μm, 球形度较高, 流动性良好, 适用于SLS成型;SLS成型最优参数为激光功率7W、扫描间距0.15mm、扫描速率2200mm/s、单层层厚0.15mm且CIP压力为80MPa时, SiC陶瓷素坯的性能最佳, 抗弯强度为 (2.23±0.10) MPa, 密度为 (1.31±0.05) g/cm3;在1950°C下烧结2h后, 样品发生了致密化, SiC陶瓷密度为 (1.95±0.17) g/cm3, 相对密度为 (60.81±5.31) ％, 抗弯强度为 (55.43±4.04) MPa.%With the spray-dried SiC-Al2O3-Y2O3 powder as raw material, composite powder prepared by mechanical mixing was used to fabricate SiC ceramics by selective laser sintering/cold isostatic pressing combined with liquid phase sintering.The material phase composition, microstructure, flexural strength and density of SiC ceramics were characterized. The results show that spray-dried powder has an average diameter of 39.43μm with fine sphericity and flowability, which is suitable for SLS process. With the optimum parameters (laser power of 7 W, scanning speed of 2200 mm/s, scanning space of 0.15 mm and layer thickness of 0.15 mm) and CIP pressure of 80 MPa, the green bodies show the superior quality with flexural strength of (2.23±0.10) MPa and bulk density of (1.31±0.05) g/cm3. After being sintered at 1950°C for 2 h, samples are densified that the bulk density and relative density of SiC ceramics are (1.95±0.17) g/cm3 and (60.81±5.31) ％, respectively and the flexural strength is (55.43±4.04) MPa.
