Mo含量对TiC基金属陶瓷材料力学性能影响研究

Influence of Mo Addition on Mechanical Properties of TiC-based Metallic Ceramic

通过对用传统粉末冶金方法制取的4种成分各异的硬质合金试样进行强度、硬度测试以及XRD物相分析、SEM扫描电镜分析,研究Mo对TiC基硬质合金组织结构和力学性能的影响。实验结果表明:添加Mo后,(Ti1-xMox)C基金属陶瓷出现了类似TiC基金属陶瓷芯壳结构,其芯部为(Ti1-xMox)C,壳部为黏结相Co,这一点在XRD物相分析中得到证实;从SEM扫描可以看出,(Ti1-xMox)C基金属陶瓷的显微组织较细,断口较光滑,晶界较为明显,为典型的穿晶断裂;随着Mo元素的增加,(Ti1-xMox)C基金属陶瓷材料抗弯强度先降后增,最高为104 MPa;黏结剂Co的加入在一定程度上增加了材料的力学性能。

Four kinds of composition ratio of（Ti1- xMox）C samples are prepared by conventional powder metallurgy method. In this paper, the impact of the different proportions of Mo on the organization structure and mechanical properties of（Ti1- xMox）C（x=0.1,0.2,0.3,0.4） is investigated by strength, hardness and XRD and SEM analysis. The experimental results show that（Ti1- xMox）C based cermets have a core- shell structure similar with TiC based metal after addition of Mo. Its core is（Ti1- xMox）, and shell is the binder phase of Co. It can be confirmed in XRD analysis. It can be seen from the SEM Scanning.（Ti1- xMox） C- based cermet＇s microstructure is smaller and it has a smooth fracture,which is a typical transgranular fracture. After an initial increase, the flexural strength increases with the addition of Mo, up to 104 MPa. As for binder Co, in a certain extent, it gives an increase of the mechanical properties of the material.