TiC based steel bonded carbides with the addition of nano TiN were prepared by vacuum sintering techniques.The microstructure was investigated using scanning electron microscopy（SEM） and transmission electron micros...TiC based steel bonded carbides with the addition of nano TiN were prepared by vacuum sintering techniques.The microstructure was investigated using scanning electron microscopy（SEM） and transmission electron microscopy（TEM）,and the mechanical properties,such as bending strength,impact toughness,hardness,and density,were measured.The results indicate that the grain size becomes small and there is uniformity in the steel bonded carbide with nano addition;several smaller carbide particles are also found to be inlaid in the rim of the larger carbide grains and prevent the coalescence of TiC grains.The smaller and larger carbide grains joint firmly,and then the reduction of the average size of the grains leads to the increase in the mechanical properties of the steel bonded carbides with nano addition.But the mechanical properties do not increase monotonously with an increase in nano addition.When the nano TiN addition accounts for 6-8 wt.% of the amount of steel bonded carbides,the mechanical properties reach the maximum values and then decrease with further increase in nano TiN addition.展开更多
运用超声分散技术研究了纳米 Ti N粉的分散性能 ,得到了优化的超声及分散工艺参数。实验结果表明 ,分散体系中表面活性剂的引入是必要的 ,表面活性剂的加入量要合适 ;非离子型表面活性剂的分散效果优于阴离子型表面活性剂 ;适当的超声...运用超声分散技术研究了纳米 Ti N粉的分散性能 ,得到了优化的超声及分散工艺参数。实验结果表明 ,分散体系中表面活性剂的引入是必要的 ,表面活性剂的加入量要合适 ;非离子型表面活性剂的分散效果优于阴离子型表面活性剂 ;适当的超声时间及频率可以改善纳米 Ti N粉体系的分散状况。分散体系的 p H值对分散状况有一定的影响。展开更多
文摘TiC based steel bonded carbides with the addition of nano TiN were prepared by vacuum sintering techniques.The microstructure was investigated using scanning electron microscopy（SEM） and transmission electron microscopy（TEM）,and the mechanical properties,such as bending strength,impact toughness,hardness,and density,were measured.The results indicate that the grain size becomes small and there is uniformity in the steel bonded carbide with nano addition;several smaller carbide particles are also found to be inlaid in the rim of the larger carbide grains and prevent the coalescence of TiC grains.The smaller and larger carbide grains joint firmly,and then the reduction of the average size of the grains leads to the increase in the mechanical properties of the steel bonded carbides with nano addition.But the mechanical properties do not increase monotonously with an increase in nano addition.When the nano TiN addition accounts for 6-8 wt.% of the amount of steel bonded carbides,the mechanical properties reach the maximum values and then decrease with further increase in nano TiN addition.
文摘运用超声分散技术研究了纳米 Ti N粉的分散性能 ,得到了优化的超声及分散工艺参数。实验结果表明 ,分散体系中表面活性剂的引入是必要的 ,表面活性剂的加入量要合适 ;非离子型表面活性剂的分散效果优于阴离子型表面活性剂 ;适当的超声时间及频率可以改善纳米 Ti N粉体系的分散状况。分散体系的 p H值对分散状况有一定的影响。
