Tungsten Titanium Alloy Cryogenic Treatment

Tungsten titanium alloy, due to its stable thermomechanical properties, is not only suitable for use in high current and high temperature environments, but also has a series of advantages such as low electron mobility, high corrosion resistance and good chemical stability, the best candidate for blocking the diffusion between Cu and Si / SiO₂.

However, the tungsten titanium alloy is too brittle, and it is difficult to roll and forge. Therefore, it is necessary to find a way to improve the grain orientation of the alloy and to take into account the microstructure and properties of the alloy.

A cryogenic treatment method for tungsten titanium alloy has been put forward by scholars. The tungsten titanium alloy after cleaning is placed on the sample rack of cryogenic treatment equipment, and the valve of self boosting low temperature fluid delivery device equipped with cryogenic medium is opened. The alloy was treated by gas atomization. After treatment, the power was cut off, the cold source was closed, the tungsten titanium alloy was removed and put into the bath at 15~25 degrees centigrade, and the temperature was rapidly reheated at 180~220 ℃/s.

The cryogenic treatment of tungsten titanium alloy is carried out for two times. The technological parameters of gas spray treatment are: the cooling rate is 8~15 ℃/min, the holding temperature is -150 ~ -196 ℃, and the holding time is 2 ~ 4H.

The cryogenic treatment method of tungsten titanium alloy is mainly cooled by liquid nitrogen gasification latent heat and low temperature nitrogen heat. The cooling temperature is low, and there is no thermal shock on tungsten titanium alloy, which reduces the brittle fracture of tungsten titanium alloy at low temperature. The cryogenic treatment with rapid cooling and rapid heating is adopted, and the rapid cooling method provides greater internal stress for grain refinement and grain rotation. However, the rapid return of temperature after deep cooling reduces the grain length caused by the temperature increase large, consolidate cryogenic effect and improve production efficiency.

The cryogenic treatment of tungsten titanium alloy not only has a certain crystal orientation, but also has good mechanical properties, so as to obtain a good barrier effect of the film.

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