Effects of Cu-Sn,Ni-Cr and Co Sintering Additives on Properties of Ni3Al/Diamond Composites
Ni3Al/diamond composites were prepared by vacuum hot pressing.The effects of different sintering additives on the mechanical properties and microstructure of the composites were studied,and the drilling performance of the Ni3Al/diamond drilling bit was tested.The results show that,after the addition of Cu-Sn,Ni-Cr,and Co sintering agent ranging from 0 to 30vol%,the density,bending strength and hardness of Ni3Al/diamond tool bit are improved.With the content of Ni-Cr and Co increasing,the bending strength of Ni3Al/diamond composites is increased.Enrichment of the Cr elements in the Cu-Sn and Ni-Cr sintering additives is observed on the surface of the diamond.The Ni3Al/diamond composite materials supplemented with Cu-Sn and Ni-Cr sintering additives were prepared into a tool for drilling and testing.The results show that the failure forms of Ni3Al/diamond composites with Cu-Sn and Ni-Cr sintering additives can be divided into three forms:micro crushing,abrasion and macro crushing.The phenomenon of falling off of the whole diamond is not found in the drilling test,indicating that Ni3Al based has a large holding force on diamond and the strength is high.
NETL
NSTL
万方数据
