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仿生结构复合陶瓷刀具材料力学性能及显微结构
作者:
作者单位:

1.山东建筑大学 机电工程学院 济南;2.山东建筑大学 材料科学与工程学院 济南

中图分类号:

TQ174

基金项目:

国家自然科学基金资助(项目号51375281)


Microstructure and Mechanical Properties of Biomimetic Composite Ceramic Tool Materials
Author:
Affiliation:

1.School of Mechanical and Electronical Engineering,Shandong Jianzhu University;2.School of Material Science Engineering,Shandong Jianzhu University

Fund Project:

National Natural Science Foundation of China(51375281)

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    摘要:

    针对不同烧结条件及TiC/WC组分比,采用热压烧结工艺制备出三层仿生结构复合陶瓷刀具材料。测试了仿生结构复合陶瓷材料力学性能,并对材料断口形貌和裂纹扩展进行了观察分析。结果表明:仿生结构复合陶瓷刀具材料抗弯强度达870 MPa,维氏硬度达21.83 GPa,断裂韧性达7.56 MPa?m1/2,比SG4均质陶瓷刀具材料性能有所提高。断口形貌显示仿生结构复合陶瓷刀具材料较SG4均质刀具材料晶粒细密,晶粒尺寸呈现多尺度特征。材料断裂模式为穿晶断裂和沿晶断裂混合型。仿生结构复合陶瓷材料表面裂纹扩展呈现偏转和分叉。裂纹穿过材料界面扩展时有明显偏转现象。

    Abstract:

    :According to different sintering conditions and TiC/WC composition ratio, three-layer biomimetic composite ceramic tool materials were prepared by hot pressing sintering process. The mechanical properties of the biomi-metic composite ceramic materials were tested, and the fracture surface morphology and crack propagation were analyzed. The flexural strength, Vickers hardness and fracture toughness are 870 MPa, 21.83 GPa, and 7.56 MPa?m1/2, which is higher than that of SG4 homogeneous ceramic cutting tool material. Section morpholo-gies show that the bioimimetic composite ceramic material has finer microstructure than that of SG4 ceramic cuttin tool material, and the grain size shows multi-scale characteristic. Fracture surfaces demonstrate a trans-granular/intergranular mode. The crack propagation path of the surface layer shows crack deflection and bifur-cation of the crack tip.The crack is also deflected as crack passing through the bi-material interface.

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吕志杰,邓莉莉,田清波,程凯强,赵晓丽.仿生结构复合陶瓷刀具材料力学性能及显微结构[J].稀有金属材料与工程,2018,47(12):3848~3852.[LV Zhijie, DENG Lili, TIAN Qingbo, CHENG Kaiqiang, ZHAO Xiaoli. Microstructure and Mechanical Properties of Biomimetic Composite Ceramic Tool Materials[J]. Rare Metal Materials and Engineering,2018,47(12):3848~3852.]
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  • 收稿日期:2017-03-30
  • 最后修改日期:2017-04-09
  • 录用日期:2017-04-14
  • 在线发布日期: 2019-01-04