Tungsten copper nickel alloy
Tungsten-copper-nickel alloy is a kind of high density alloy, which contains 6% nickel, 4% copper and the rest tungsten. It is named because of its high density. Powder metallurgy is generally used for production.
Tungsten copper-nickel high specific gravity alloy is a kind of alloy with tungsten matrix (W content 85 ~ 99%) and Ni, Cu, Co, Mo, Cr and other elements added. The alloy has no ferromagnetism, relatively good conductivity and thermal conductivity, and is often used in some special occasions, such as gyroscope rotor, and other devices and instrument parts required to work under the action of magnetic field, electrical contacts of high voltage electrical switches and some electrodes used in electrical processing. It can also be used for radium containers, balancing weights and other parts requiring high density.
The tungsten-copper-nickel alloy is divided into W-Ni-Fe, W-Ni-Cu, W-Co, W-WC-Cu, W-Ag and other main series. Its density is up to 16.5 ~ 19.0g/cucm, and it is known as high specific gravity alloy. It also has a series of excellent characteristics.
In view of the high specific gravity alloy has the above excellent function, tungsten copper nickel alloy is widely used in aerospace, aviation, military, oil drilling, electrical instrument, medical and other industries.
The absorption capacity of W-Cu-Ni alloy is 30 ~ 40% higher than that of lead. The thermal conductivity of tungsten copper nickel alloy is large: 5 times that of die steel; Small thermal expansion coefficient: only iron or steel 1/2 ~ 1/3; Good electrical conductivity; Good weldability and machinability.
The preparation steps of tungsten-copper-nickel alloy are as follows:
(1) Tungstate crystal, copper crystal and nickel crystal are used as raw materials, and the raw materials are mixed according to the required proportion of tungsten, copper and nickel components to prepare a mixed salt aqueous solution with a concentration of 18~35 wt%;
(2) Add acid in the solution to adjust the pH of 2~3, add the mass percentage of 0.1~0.5% of the surfactant in the solution to fully stir evenly, to obtain a transparent colloid;
(3) Spray pyrolysis was carried out on the colloid in the spray dryer to prepare the ultrafine mixed powder precursor. The ultrafine mixed powder precursor was calcined at 180~500℃ for 0.5~3h to get the tungsten, copper and nickel oxide mixed powder;
(4) The obtained ultrafine powder precursor was reduced in H2 at 120~300℃ and 600~900℃ respectively to obtain nano-sized WC-Cu-Ni composite powder.
