Simultaneous optimization of the tensile strength, bending strength, hardness and wear resistance of W-Cu composite produced by sintering process

In this research, the mechanical properties of tungsten-copper (W-Cu) composite fabricated by the sintering technology were optimized by design of experiments. The parameters of sintering temperature, sintering time and weight percentage of copper were selected to optimize the tensile strength, bending strength, wear resistance and hardness of the W-Cu composite using the response surface method combined with desirability process. The microstructure of the W-Cu composite was also examined by SEM, TEM, XRD and EDS analyses. The results showed that a rise in the sintering temperature from 1000 to 1150 degrees C improved the tensile strength of W-Cu composite, while a rise in the sintering temperature from 1150 to 1300 degrees C deteriorated the tensile strength. Moreover, the bending strength, wear resistance and hardness of the W-Cu composite continuously enhanced with the increase of sintering temperature from 1000 to 1300 degrees C. An increase in the amount of Cu from 20 to 40 wt% resulted in a reduction in the wear resistance and hardness of the W-Cu composite, while the increase of Cu content improved the tensile and bending strengths. It was also showed that mechanical properties of the W-Cu composite can be improved simultaneously by using 23 wt% Cu at sintering temperature of 1220 degrees C and sintering time of 2.5 h.