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Zhang Z.,Kunming University of Science and Technology | Peng J.,Key Laboratory of Unconditional Metallurgy | Guo S.,Kunming University of Science and Technology | Li F.,Zigong Cemented Carbides Corporation Ltd | And 2 more authors.
Fenmo Yejin Jishu/Powder Metallurgy Technology | Year: 2011

The WC-Co cemented carbide was prepared by powder technology with argon gas pressing and sintering at 5 MPa. In order to investigate the effect of carbon content, sintering parameter, cobalt content, nickel content and ball milling parameter on the transverse rupture strength (TRS) and density of the alloy, the experiment was arranged with Shainin's variables search experiment design. It shows that the effect sequence from high to low on the transverse rupture strength is the interaction between sintering parameters and ratio of ball to powder, interaction between sintering parameter and nickel content, interaction between cobalt content and ball milling time, cobalt content itself, interaction between carbon content and ball milling time. The effect sequence from high to low on the relative density is the cobalt content, interaction between cobalt and sintering parameters, sintering parameters themselves, interaction between nickel content and ball milling parameters.


Zhang Z.-F.,Kunming University of Science and Technology | Huang L.-L.,Kunming University of Science and Technology | Peng J.-H.,Key Laboratory of Unconditional Metallurgy | Tan Z.-F.,Zigong Cemented Carbides Co. | And 3 more authors.
Jinshu Rechuli/Heat Treatment of Metals | Year: 2011

The coarse grain WC-Co cemented carbide was manufactured through powder metallurgy with the gas pressure sintering. Effects of some factors including carbon content, sintering parameters, cobalt content, nickel content and ball milling parameters on the hardness and impact toughness of the alloy were investigated by the Shainin's variables search experiment design. The results show that the effective sequence from high to low on the hardness is cobalt content, ball milling time, carbon content, mass ratio of ball/powder and sintering parameters. In order to get the highest hardness of the alloy, some technology condition is needed, such as cobalt content 9wt%, ball milling time 26 h, suitable lower carbon content, mass ratio of ball/powder 3: 1 and sintered at 1380 °C. However, the effective sequence from high to low on the impact toughness is interaction between sintering parameters and nickel content, interaction between carbon content and sintering parameters, carbon content itself, interaction between cobalt content and nickel content, cobalt content itself. In order to get the biggest impact toughness, it is needed that the alloy is sintered at 1345 °C, and added nickel by ratio Co: Ni =9: 1, contains saturated carbon content and 11 wt% cobalt. Finally, it reveals that the technology requirement between the hardness and the impact toughness is opposited entirety in carbon content, cobalt content and sintering temperature.

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