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Ablation Hole Characteristic of 2.5-dimensional Cf/SiC Composites Processed by Nanosecond Laser

JIAO Haowen1;CHEN Bing1;LUO Liang1;LI Jinbang2,3   

  1. 1.Hunan Provincial Key Laboratory of High Efficiency and Precision Machining of Difficult-to-Cut Material,Intelligent Manufacturing Institute,Hunan University of Science and Technology,
    Xiangtan,Hunan,411201
    2.Faculty of Mechanical Engineering and Mechanics,Ningbo University,Ningbo,Zhejiang,315211
    3.Part Rolling Key Laboratory of Zhejiang Province,Ningbo University,Ningbo,Zhejiang,315211
  • Online:2020-04-25 Published:2020-06-11

纳秒激光加工2.5维Cf/SiC复合材料的烧蚀孔洞特征

焦浩文1;陈冰1;罗良1;李锦棒2,3   

  1. 1.湖南科技大学智能制造研究院难加工材料高效精密加工湖南省重点实验室,湘潭,411201
    2.宁波大学机械工程与力学学院,宁波,315211
    3.浙江省零件轧制成形技术研究重点实验室,宁波,315211
  • 基金资助:
    国家自然科学基金资助项目(51705148);
    湖南省自然科学基金资助项目(2018JJ3165);
    浙江省零件轧制成形技术研究重点实验室开放课题资助项目(PR-18002)

Abstract: In allusion to difficult machining problems of new 2.5-dimensional carbon fiber reinforced ceramic-based(Cf/SiC) composite materials by conventional machining, the 2.5-dimensional Cf/SiC composite materials were ablated by nanosecond laser. After ablating, the morphology of ablation hole characteristics were observed by scanning electron microscope, and the ablation removal mechanism was analyzed. The influences of laser parameters on the ablation hole were discussed. The results show that the ablation phenomena of Cf/SiC composites occur in the laser ablation area, such as ablation holes, resolidification, fiber fracture, end swelling, and elliptical material performance change area with long axis along fiber direction. Oxidation reaction may be found during laser ablation processes of Cf/SiC composites materials. The ablation hole diameter increases with the increasing ablation power and ablation time. When the ablation time and ablation power are large enough, there may be a case where the ablation hole is blocked or partially blocked by the resolidification materials. The beam waist radius of nanosecond laser was calculated to be as 223 μm, and the ablation threshold of Cf/SiC composite materials is 0.32 J/cm2 by nanosecond laser.

Key words: nanosecond laser, Cf/SiC composites material, characteristics of ablation hole, beam waist radius, ablation threshold

摘要: 针对新型材料2.5维碳纤维增强陶瓷基(Cf/SiC)复合材料采用传统机械加工难以去除加工的问题,采用纳秒激光烧蚀2.5维Cf/SiC复合材料,烧蚀后采用扫描电子显微镜观察其烧蚀孔洞形貌特征,并分析其烧蚀去除机制,讨论激光加工参数对烧蚀孔径的影响。研究表明,Cf/SiC复合材料的激光烧蚀区域出现烧蚀孔洞、重凝、纤维断口、末端气胀,以及长轴与纤维方向一致的椭圆形材料性能变化区域等烧蚀现象;激光烧蚀Cf/SiC复合材料过程中存在氧化的化学变化现象;烧蚀产生的孔径随烧蚀功率的增加和烧蚀时间的延长而增大,烧蚀时间和烧蚀功率均较大时,可能存在烧蚀孔洞被重凝材料堵塞或部分堵塞的情况。计算出纳秒激光的束腰半径为223 μm,纳秒激光烧蚀Cf/SiC复合材料的烧蚀阈值为0.32 J/cm2。

关键词: 纳秒激光, Cf/SiC复合材料, 烧蚀孔洞特征, 束腰半径, 烧蚀阈值

CLC Number: