Research On New Ti(C,N) Based Cemented Carbide

We aim to have a sort of cemented carbide with high temperature hardness, high wear resistance, high cutting speed and precision as well as high toughness, excellent performance. This new cemented carbide consists of nanocrystalline TiN0.3, commercial TiC for hard phase, high-entropy alloy for binder phase, WC, AlN for the second phase additive through the appropriate ratio.We have successfully prepared HEA-1、HEA-2、HEA-3 high entropy alloy by mechanical alloying method. Three kinds of high-entropy alloys have shown FCC, BCC simple solid solution structure in the XRD patterns. In the DSC curves of three kinds of high entropy alloys. Melting point of HEA-1、HEA-2、HEA-3 high entropy alloy was 1314 ℃, 1312 ℃, 1340 ℃ respectively, which exhibit excellent high temperature stability.The high entropy alloy as the binder phase is investigated, HEA-1、HEA-2 high entropy alloy binder phase results show high entropy alloys can exist stable carbide system stably. Two carbide fracture surface can be observed obvious signs of grain pull out, the grain pits surface can find residual melt, indicating high entropy alloy permeates in the grain boundaries, can make grains together strongly, and increase high-entropy alloy content is beneficial to prevent grain growth. When adding 10wt% HEA-1 high entropy alloy as the binder phase. The toughness is 7.05 MPa?m1/2.The third part by adding WC, AlN to control performance, results showed hardness of cemented carbide decreased significantly after adding WC for 13.37 GPa. Enhance toughness gained significant upgrade for 8.51 MPa?m1/2.Ti(C,N) based cemented carbide with adding AlN from its fracture scans can be seen, the organizational structure is not dense, the surface has a lot of presence of pores, irregular grain growth, generating a large number of Al2O3, but the hardness was greatly increased, reaching more than 20.00 GPa. Too many voids, insufficient density is a major factor for causing decrease in toughness; Ti(C,N) based cemented carbide with adding AlN and WC for hard fracture SEM can be seen, significantly reduced porosity, density has been significantly improved, the grain surface has no significant precipitation Al2O3.The hardness values gradually increase with increasing the content of AlN, adding 2wt% of AlN of Ti(C,N) based alloy toughness reaches 8.00 MPa?m1/2.