Novel synthesis of CuW composite reinforced with lamellar precipitates via aluminothermic reduction
Chu Cheng, Ziwei Song, Ling‐Feng Wang, Kexing Song, Tao Huang, Long Zhi Zhao, Lisha Wang, Zhihe Dou, Ting‐an Zhang
Abstract
The in situ synthesized reinforced phases in the matrix have the advantages of uniform dispersion and good interfacial bonding. Aiming at in situ synthesizing reinforced phases in CuW composite, a novel methodology for direct synthetization of CuW composite reinforced with lamellar precipitates by aluminothermic reduction is proposed, and CuW composites and their slags were systematically analyzed. The results indicate that, at temperatures of above 1800 K, the mole percentage of Al, copper oxides, tungsten oxide, and CuO·Al 2 O 3 increased rapidly with temperature increasing, which was not conducive to CuO and WO 3 thermite reduction. Tungsten particles were evenly distributed on the matrix, with portions inlaid on the Al 4 W lamellar precipitates. With molar ratio of WO 3 and CuO ( R (Cu/W) ) increasing, the number of Al 4 W lamellar precipitates decreased, and the matrix Al content increased, whereas the area ratio of tungsten particles first increased and then decreased. The addition of CaO promoted the separation of metal and slag, but hindered the reduction reaction of WO 3 .