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| Effect of binder Co and Ni on the microstructure and mechanical properties of Ti（C0.7N0.3）-based cermets |
| LI Chao，LI Nan，LIU Xue-quan，LIN Fei，LI Fa-chang |
| （Central Iron & Steel Research Institute， Beijing 100081， China） |
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Abstract Ti（C0.7N0.3）-based cermets were prepared by low pressure sintering of powder metallurgy method. The effect of Co/（Co＋Ni） ratio on microstructure and mechanical properties were investigated using SEM， EDS and mechanical properties test instrument. Results show that after sintering at 1 400 ℃ for 1 h， the microstructure of Ti（C0.7N0.3）-based cermets is composed of black core， grey shell and white binder phase. When the total binder is 20% （mass percent） and Co/（Co＋Ni） ratio increases from 0 to 0.6， the bending strength of the cermet gradually increases to the maximum of 2 210 MPa， and then decreases gradually； while the hardness of the cermet reaches the maximum value of 92.1 HRA and then tends to be stable and no longer changes significantly with the increase of Co/（Co＋Ni） ratio.
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Received: 03 August 2017
Published: 22 February 2019
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2019, Vol. 29 
