摘要
本文采用低压烧结工艺制备了不同石墨烯含量的Ti(C0.7,N0.3)基金属陶瓷刀具材料,采用扫描电子显微镜(SEM)和光学显微镜(OM)对材料进行微观结构分析,通过X射线衍射(XRD)对材料进行物相分析,测试了金属陶瓷的密度、硬度、抗弯强度、断裂韧性等力学性能,研究了石墨烯添加量对Ti(C0.7,N0.3)基金属陶瓷组织和力学性能的影响。结果表明,石墨烯的加入并未改变Ti(C,N)基金属陶瓷的组织结构特征,却可以有效增韧Ti(C0.7,N0.3)基金属陶瓷。随着石墨烯添加量的增加,显微硬度逐渐降低,抗弯强度先上升后下降,断裂韧性呈现先增加后略有下降的趋势。当石墨烯添加量为0.6%时(质量分数,下同),综合力学性能达到最好,在抗弯强度不降低的情况下,断裂韧性提高了32.7%。此时,金属陶瓷的抗弯强度和断裂韧性分别为1450.8 MPa和12.85 MPa·m1/2。
In this paper, Ti(C0.7,N0.3)-based cermets tool materials with different graphene content are prepared by lowpressure sintering. Scanning electron microscopy(SEM) and optical microscope(OM) are used to analyze the microstructure of the material, and X-ray diffraction(XRD) is used to analyze the phase of the material. Mechanical properties of the cermets are tested, including density, hardness, bending strength and fracture toughness, etc. The effects of the amount of graphene added on the microstructure and mechanical properties of Ti(C0.7,N0.3)-based cermets are studied. The results show that the addition of graphene does not change the structural characteristics of Ti(C,N)-based cermet, but it can effectively toughen Ti(C0.7,N0.3)-based cermet. As the content of graphene increases, the microhardness gradually decreases, the bending strength first increases and then decreases. The fracture toughness also tends to increase first and then slightly decrease with the increase of graphene addition. When the content of graphene is 0.6 wt.%, the comprehensive mechanical properties of the cermet are the best, and the toughness is improved by 32.7% without reducing the strength. Meanwhile, the flexural strength and fracture toughness ofthe cermetare 1 450.8 MPa and 12.85 MPa·m1/2,respectively.
作者
李帅
孙兰
Li Shuai;Sun Lan(Sichuan University,Chengdu Sichuan 610065,China)
出处
《硬质合金》
CAS
2020年第3期195-202,共8页
Cemented Carbides
基金
四川省科技计划项目—碳氮化钛基金属陶瓷立铣刀的研究(2018GZ0345)。
