Ultrafine Tungsten Copper Powder Preparation by Hydrothermal Synthesis

Tungsten copper alloys are widely used in resistance welding, electrical contact materials and EDM plasma electrode materials due to their high strength, high hardness, arc erosion resistance and fusion resistance. It can be used in the lead frame of large scale integrated circuits, heat sink substrates of solid-state microwave tubes and the throat lining of rocket nozzle with short-term high temperature resistance in aerospace technology.

Some scholars try to prepare ultrafine tungsten copper powder by hydrothermal synthesis, which is the most commonly used method. Sodium tungstate and copper nitrate were taken as raw materials according to the mass ratio of 1.42-0.20, and then the solution was prepared, in which the concentration of copper nitrate was 2.0-2.2 mol/L and the concentration of sodium tungstate was 1.29-0.18 mol/L. Then the sodium tungstate solution was added to the copper nitrate solution, and the mixed solution was prepared by fully mixing. After that, the pH value of the mixed solution was adjusted by NaOH solution to 5-6, so that the mixed solution appeared sol. The obtained sol-containing mixed solution was loaded into a high-pressure reactor and reacted at pressure of 6-20 MPa and temperature of 160-180 ℃ for 20-25 hours before natural cooling. Finally, the product was filtered out and washed with absolute ethanol and deionized water in turn. The washed sample was dehydrated and dried at 75-85 ℃ for 7-8 hours at constant temperature to obtain tungsten copper oxide solid composite powder.

Ultra-fine tungsten copper oxide composite powder was prepared by hydrothermal synthesis method. The composite powder of tungsten copper oxide was prepared in one step in the reactor. It did not need thermal decomposition any more and retained the mixed state of molecular level in solution. The composite powder of tungsten copper oxide with ultra-fine particles and uniform structure could be prepared, thus improving the sintering performance of tungsten copper alloy and preparing tungsten with high density and excellent thermal conductivity. Copper alloy, and this method also reduces the precursor solution atomization, drying and precursor calcination decomposition process in the existing methods. The process is simple, easy to operate, and can save a lot of energy.

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