摘要
采用真空烧结工艺制备Ti(C,N)基金属陶瓷,测定了材料的力学性能。结果表明,其力学性能与未加纳米粉的金属陶瓷相比,硬度略有升高,但横向断裂韧性提高了近一倍。断口形貌和微观组织分析表明:金属陶瓷的断口形貌与其强韧性有着密切的关系。纳米粉的加入降低了原始粉末的平均粒度,使得金属陶瓷硬质相的粒度降低,减小了晶粒间的平均自由程。镶嵌于大颗粒环形相和弥散分布于粘结相中的细小硬质相颗粒,对裂纹的形成和扩展起到阻碍作用,会使金属陶瓷因裂纹扩展途径发生偏转而增韧。
The Ti（C, N）-based cermets were produced by vacuum sintering technology, and the mechanical properties were measured. The results show that the hardness of nano-composite Ti（C, N）-based cermets slightly increases, while the transverse rupture strength （TRS） increases by a factor of two times compared with micron cermets. The analysis of appearance of fracture and microstructure indicates that there is compact relation between appearance of fracture and toughness. With the addition of nano-structured powders, the mean particle size of raw powders decreases, the mlcrostructure becomes finer and distributes evenly, and the average distance between grains reduces. Some small grains are found to be embedded in binder and the rim phases of big grains obstruct the form and extend of crack. The experiment results indicate that the toughening mechanisms of nano-composite cermets is crack deflection toughening.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2006年第5期800-804,共5页
The Chinese Journal of Nonferrous Metals
基金
国家自然科学基金资助项目(50074017
50104006)
湖北省自然科学基金资助项目(2000J032)
湖北省教育厅科研项目计划资助项目(2001D67002)
湖北省耐火材料与高温陶瓷重点实验室开放基金资助项目(G0507)
