光学精密工程2012，Vol.20Issue(7)：1551-1558,8.DOI:10.3788/OPE.20122007.1551
SiC颗粒掺杂对激光直接成形Al2O3陶瓷裂纹敏感性的影响
Effect of SiC particles on crack susceptivity in laser direct forming Al2O3 ceramic
摘要
Abstract
The toughening effect of SiC particles was applied to inhibition of the cracks in A12O3 ceramic for Laser Direct Forming (LDF). The experiments of coaxial laser cladding A12O3 ceramic added SiC particles were performed on the Ti-6A1-4V alloy substrate to investigate the feasibility of A12O3 + SiC composite ceramic by LDF and explore the factors effecting on the crack susceptivity. The cracks, microstructures and the combining of the two compositions were observed by an optical microscopy, and the phase transitions were detected by X-ray diffraction. The results show that some complete SiC particles contained in the A12O3 ceramic can inhibit the cracks, and the Al2O3+SiC composite ceramic without serious chemical reactions or combining defects can be prepared. The crack susceptivity is significantly affected by the proportion of SiC (f), laser power (P), scanning velocity (v) and the pow-der flow rate (n). Finally, a thin-wall Al2O3+SiC composite ceramic block(17 mm×6 mm×2 mm) without the obvious defects was formed with the parameters of f,P, v and n in 10%(weight proportion) , 186 W， 300 mm/min and 1. 78 g/min, respectively.关键词
激光技术/直接成形/复相陶瓷/SiC颗粒/裂纹抑制Key words
laser technique/ direct forming/ composite ceramic/ SiC particle/ crack inhibition分类
信息技术与安全科学引用本文复制引用
吴东江,杨策,吴楠,郭玉泉,马广义,郭东明..SiC颗粒掺杂对激光直接成形Al2O3陶瓷裂纹敏感性的影响[J].光学精密工程,2012,20(7):1551-1558,8.基金项目
国家自然科学基金资助项目(No.51175061) （No.51175061）
国家973重点基础研究发展计划资助项目(No.2009CB724307) （No.2009CB724307）
