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| Effect of binder on properties of iron based mixed powder |
| SU Fengge1, ZHENG Zhuo2, CHEN Lushui1 |
1. Jiande Welfine Technology Co., Ltd., Hangzhou 311613, China;
2. Hangzhou Yitong New Materials Co., Ltd., Hangzhou 311613, China |
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Abstract Fe-C, Fe-Cr-C, Fe-Ni-Cu-C and other iron-based mixed powders were prepared by bonder-treated process method using self-made binder. Scanning electron microscopy (SEM) was used to observe the morphology and structure of the Fe-Ni-Cu-C mixed powder. The effects of binder content (mass fraction) on the flowability, apparent density, compressibility of Fe-C mixed powder, and on the transverse rupture strength (TRS) of Fe-C greens were studied. The results show that in the Fe-Ni-Cu-C mixed powder prepared by bonder mixing method, most of the small particles are bonded to the surface of the large iron powder, which reduces the segregation of the powder composition. Compared with the Fe-C powder without binder, the flowability of Fe-C mixed powders with 0.02% and 0.03% binder increases, and the required more pressing pressure. But the maximum increase is less than 6%, which is acceptable in actual production. The TRS of Fe-C green without binder is 12.5 MPa, and that with 0.03% binder is 13.7 MPa, and 45.8 MPa after curing. The Fe-Cr-C double row sprocket blank prepared by this process has good machinability, and can keep the integrity of sprocket tooth profile and machining edge under intermittent cutting condition.
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Received: 10 March 2020
Published: 18 January 2021
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2020, Vol. 25 
