Thermodynamic Analysis of Developing Tungsten Molybdenum Composite Alloy with Low Quality Tungsten Molybdenum Ore

After adding tungsten and molybdenum to the steel, eutectic carbides are generated, which promote particle refinement and can be evenly distributed in the steel structure. Therefore, the high-temperature strength and hardness of the steel can be improved, and the toughness, thermoplasticity, and wear resistance of the steel can be increased. Due to the fact that steel containing tungsten and molybdenum can effectively prevent embrittlement and improve the stability of the steel during the tempering process of later heat treatment, tungsten molybdenum alloy is an alloy additive for high-speed cutting steel, high-speed tool steel, mold steel, stainless steel, heat-resistant steel, magnetic steel, heat-resistant alloy steel, and high-temperature alloy.

The development of tungsten molybdenum composite alloys using low-quality tungsten molybdenum ore is an effective way to comprehensively and efficiently utilize it. The thermodynamics of the reduction reaction of the ore was calculated using four different reducing agents C+SiO2, Si, SiC, and CaC2. The starting temperatures for complete reduction reaction were 1552, 1403, 1613, and 2002K, respectively. Due to the dense structure and high bond energy of calcium fluorophosphate Ca5 (PO4) 3F in the ore, it is most difficult to reduce during the reduction process. Therefore, reducing the mass fraction of impurity elements phosphorus and fluorine is the key to developing high-quality tungsten molybdenum composite alloys.