激光烧结SiC陶瓷复合材料块体的组织及性能研究

Microstructure and Performance of Laser Sintering of SiC Composite Ceramic Materials

在45钢基体上利用激光烧结技术制备了SiC陶瓷复合材料块体,并利用扫描电子显微镜、能谱仪、显微硬度计等设备,分析了试样的显微组织特征,并对试样硬度和磨损性能进行了测定。结果表明,SiC纳米颗粒作为纳米添加相,一部分弥散在粘结相镍基合金中,使材料的力学性能大大改善,另一部分由于机械混合的不均匀性而形成团簇,并作为微观应力抑制点;而复合材料中的WC微米颗粒在高比能量的激光作用下,被进一步细化和分散在粘结相中;分析同时发现,随着激光功率的增加,材料的硬度和耐磨损性能明显增加,力学性能得到改善。

The two kinds of proportional composite ceramic bulks of nano-SiC have been attained on 45 # carbon steel by laser sintering. The microstructure and the mechanism of those bulks are analyzed with SEM and EDS, the micro-hardness and wear resistance is measured. The results show that some nano-SiC particles are dispersed into Nickel-based metal by powerful laser, the performance of bulks have been reinforced by those nano-SiC particles, another part of nano-SiC particles forms the group bunch according to machinery mixes ; micro particles of WC in composite materials are separated into smaller particles existent in Nickel-based metal. With the reinforcement of laser power, micro-hardness and wear resistance of materials have obvious increasement, mechanics performance is improved.