Vanadium Tungsten Copper Composite Material by High Energy Ball Milling

Studies have shown that tungsten can effectively reduce the phase transition temperature of vanadium dioxide, copper can enhance the conductivity of vanadium dioxide.

The tungsten-doped vanadium dioxide powder and copper synthesis of a vanadium tungsten copper composite using a thermal and magnetic properties of the resistive composite mutation, it can reduce the phase transition temperature of vanadium dioxide, this composite material can be used in the field of weapons and equipment, industrial production and information. The high energy ball milling method can get the better quality powder products, and finally will have a significant effect on the physical properties of the composites, such as electrical properties and magnetic properties, that is, the phase transformation effect of the composites is improved, and the doping methods are as follows.

Weighing V_0.97W_0.03O₂ powder and electrolyzing Cu powder, the ratio of the amount of V to Cu is 20~50:50~80; Then the powder mixed into the mill, adding to 15 times ~60 times V_0.97W_0.03O₂ powder and Cu powder of total quality of grinding ball, mechanical mixed powder 12-72h composite powder were obtained; Again, the composite powder and grinding ball are used in high energy ball mill for 72h ball milling, and the rotational speed of the ball mill is 100-800r/min. The mixed uniform powder is screened by cold pressing die and pressure 300KN is pressed, and the composite material is formed by 3-8 minutes.

Finally, the material blank is put in a pressurizable crucible, placed in a vacuum sintering furnace, and the inside of the furnace is evacuated. When the degree of vacuum reaches 10^-1 ~ 10^-3Pa, the furnace is heated and heated to 600 ~ 700 ℃ when the insulation 60-120min, then natural cooling, when the vacuum sintering furnace temperature is reduced to room temperature, the recovery of the pressure inside the furnace to 1 × 10⁵Pa after removing the composite blank, the blank surface after machining to obtain Cu/V_0.97W_0.03O₂ composite materials.

The high-energy ball milling method can make the process of preparing the vanadium dioxide tungsten-copper composite material simple, the process can be controlled and the cost can be controlled, and the abrupt effect of the electrical property and the magnetic property of the functional composite material can be improved at different temperatures.

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