US 11,718,899 B1
Preparation method of cemented carbide with iron, cobalt and copper medium-entropy alloy as binding phase
Jigui Cheng, Hefei (CN); Ruizhi Chen, Hefei (CN); Bin Wang, Hefei (CN); Pengqi Chen, Hefei (CN); Yuyang Li, Hefei (CN); and Dang Xu, Hefei (CN)
Assigned to HEFEI UNIVERSITY OF TECHNOLOGY, Hefei (CN)
Filed by Hefei University of Technology, Hefei (CN)
Filed on Dec. 31, 2022, as Appl. No. 18/92,211.
Claims priority of application No. 202210197778.0 (CN), filed on Mar. 1, 2022.
Int. Cl. C22C 29/00 (2006.01); B22F 1/103 (2022.01); B22F 9/22 (2006.01); B22F 3/16 (2006.01); C22C 29/08 (2006.01); B22F 9/04 (2006.01)
CPC C22C 29/005 (2013.01) [B22F 1/103 (2022.01); B22F 3/16 (2013.01); B22F 9/22 (2013.01); C22C 29/08 (2013.01); B22F 2009/043 (2013.01); B22F 2202/01 (2013.01); B22F 2301/10 (2013.01); B22F 2301/15 (2013.01); B22F 2301/35 (2013.01); B22F 2302/10 (2013.01); B22F 2998/10 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A preparation method of cemented carbide with iron (Fe), cobalt (Co) and copper (Cu) medium-entropy alloy as binding phase, comprising:
step 1) preparing precursor powders, comprising: dissolving cobaltous nitrate, cupric nitrate, ferric nitrate and glycine with a molar ratio in deionized water to obtain mixed solution after ultrasonic vibration, and heating the mixed solution in a muffle furnace to obtain porous oxide precursor powders;
step 2) preparing FeCoCu medium-entropy alloy powders, comprising: fully grinding the oxide precursor powders obtained in step 1), performing reduction on the ground oxide precursor powders with hydrogen to obtain FeCoCu mixed powders and performing high-energy ball-milling and sieving on the FeCoCu mixed powders to obtain the FeCoCu medium-entropy alloy powders;
step 3) preparing tungsten carbide (WC)-FeCoCu mixed powders, comprising: mixing the FeCoCu medium-entropy alloy powders obtained in step 2) with ultra-fine WC powders in a mass ratio to obtain mixed alloy powders, adding polyethylene glycol (PEG) as a binder and ethanol absolute as a medium to the mixed alloy powders to perform ball-milling on the mixed alloy powder, the PEG and the ethanol absolute to obtain a mixed slurry, drying the mixed slurry in vacuum, grinding and sieving the mixed slurry to obtain the WC-FeCoCu mixed powders;
step 4) preparing a WC-FeCoCu cemented carbide, comprising: pressing the WC-FeCoCu mixed powders obtained in step 3) into a shape in a steel mold under a pressure between 100 mega Pascal (MPa) and 300 MPa to obtain a shaped green body, then placing the shaped green body in a tubular furnace to remove the binder under hydrogen atmosphere to obtain a binder-removing green body, and performing microwave sintering on the binder-removing green body in a microwave sintering furnace under a mixed atmosphere of nitrogen (N2) and hydrogen (H2) to obtain the WC-FeCoCu cemented carbide;
wherein the molar ratio of the cobaltous nitrate:the cupric nitrate:the ferric nitrate:the glycine in step 1) is 1:1:1:(3-9);
wherein a heating temperature of the mixed solution in step 1) is between 200 degree Celsius (° C.) and 350° C. and a heating time of the mixed solution is between 1 hour (h) and 5 h;
wherein in step 3), the mass radio of the FeCoCu medium-entropy alloy powders:the ultra-fine WC powders is between 7:3 and 19:1, and a mass of the PEG is between 1% and 5% of a total mass of the WC-FeCoCu mixed powders; and
wherein a temperature of the microwave sintering in step 4) is between 1100° C. and 1500° C. and a time of the microwave sintering is between 10 minutes (min) and 60 min.