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Doping method for powder for magnetic control coil

A magnetron coil and powder technology, applied in the field of powder metallurgy manufacturing, can solve the problems of difficult distribution of thorium nitrate particles, easy corrosion of boats and reduction furnaces, and less addition of thorium oxide, achieving small temperature changes and improving yields , the effect of improving production efficiency

Active Publication Date: 2011-04-13
XIAMEN HONGLU TUNGSTEN MOLYBDENUM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has a long process and high manufacturing cost.
[0003] In addition, the current common solid-solid doping method of thorium tungsten is to directly add thorium oxide particles into tungsten powder, and then mix the mixture by mechanical grinding to prepare doped thorium tungsten powder. Mixing makes it difficult for thorium nitrate particles to distribute evenly in tungsten powder
Another common method is the solid-liquid doping method, that is, the thorium nitrate solution is directly added to the tungsten powder. On the other hand, because thorium nitrate is a strong acid and weak base, it is easy to corrode the boat and reduction furnace during the subsequent reduction process, and introduce harmful impurities iron Fe

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0019] Prepare the thorium nitrate solution, pour the prepared thorium nitrate solution into the designated container, add an appropriate amount of ionized water and stir. Add neutralizing additive NH to thorium nitrate solution 4 OH solution and stirred to form a white colloidal mixture. Among them, the amount of ammonia water is added per 100kg blue tungsten WO 2.9 Add 700L of ammonia water with a concentration of 26% (w / v), and add the prepared blue tungsten WO into the doping pot 2.9 . The tungsten powder is blue tungsten WO with a Fischer particle size of 16.5 μm, an ammonia content of 0.22mt%, and an oxygen index of 2.92. 2.9 powder. Spray the prepared mixed solution evenly on the surface of blue tungsten WO2.9. Mix the mixture with blue tungsten WO 2.9 Mix and stir for a period of time, vacuumize the doping pot, use a water bath, stir while heating, the heating temperature of the water is 60°C, and the vacuum degree in the pot is -0.04MPa. Afterwards, in a vacuum...

example 2

[0021] Prepare the thorium nitrate solution, pour the prepared thorium nitrate solution into the designated container, add an appropriate amount of ionized water and stir. Add neutralizing additive NH to thorium nitrate solution 4 OH solution and stirred to form a white colloidal mixture. Among them, the amount of ammonia water is added per 100kg blue tungsten WO 2.9 Add 600L of ammonia water with a concentration of 28% (w / v), and add the prepared blue tungsten WO into the doping pot 2.9 . The tungsten powder is blue tungsten WO with a Fischer particle size of 15.5 μm, an ammonia content of 0.15mt%, and an oxygen index of 2.72. 2.9 powder. Spray the prepared mixed solution evenly on the blue tungsten WO 2.9 surface. Mix the mixture with blue tungsten WO 2.9 Mix and stir for a period of time, vacuumize the doping pot, and stir while heating. The heating adopts the water bath method. The heating temperature of the water is 75°C, and the vacuum degree in the pot is -0.03Pa...

example 3

[0023] Prepare the thorium nitrate solution, pour the prepared thorium nitrate solution into the designated container, add an appropriate amount of ionized water and stir. Add neutralizing additive NH to thorium nitrate solution 4 OH solution and stirred to form a white colloidal mixture. Among them, the amount of ammonia water is added per 100kg blue tungsten WO 2.9 Add 800L of ammonia water with a concentration of 25% (w / v), and add the prepared blue tungsten WO into the doping pot 2.9 powder. The tungsten powder is blue tungsten WO with a Fischer particle size of 17.5 μm, an ammonia content of 0.10 mt%, and an oxygen index of 2.82. 2.9 Powder. Spray the prepared mixed solution evenly on the blue tungsten WO 2.9 surface. Mix the mixture with blue tungsten WO 2.9 Mix and stir for a period of time, vacuumize the doping pot, use a water bath, stir while heating, the heating temperature of the water is 60°C, and the vacuum degree in the pot is -0.04MPa. Afterwards, in a v...

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Abstract

The invention provides a doping method for powder for a magnetic control coil, belonging to the field of powder metallurgy manufacturing. The process of the invention comprises the steps of doping, stirring, steam drying and the like and is characterized by comprising the following concrete steps of: adding neutral additive of aqueous ammonia NH3.H2O to a thorium nitrate solution; evenly sprayingthe prepared mixed solution to the surface of blue tungsten WO2.9 in a doping pot and stirring; vacuumizing the doping pot and heating by water, and stirring while heating; and drying the powder by adopting a steam heating method under the vacuum state to finally obtain thorium-doped tungsten powder with even doping and low impurity content.

Description

technical field [0001] The invention relates to a preparation process of magnetron coil powder, thorium nitrate and blue tungsten WO 2.9 The doping method belongs to the field of powder metallurgy manufacturing. Background technique [0002] The core component of the magnetron cathode assembly, the magnetron coil, requires uniform distribution of ThO in the tungsten matrix 2 Particles, the current preparation process of the magnetron coil raw material powder for the magnetron cathode is to use ammonium paratungstate APT to burn yellow tungsten WO 3 As a raw material, through doping, high-temperature firing, and one-time reduction to doped WO 2 , secondary reduction to doped W powder. But this method process is longer, and the manufacturing cost is higher. [0003] In addition, the current common solid-solid doping method of thorium tungsten is to directly add thorium oxide particles into tungsten powder, and then mix the mixture by mechanical grinding to prepare doped th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/02
Inventor 王竹青方毅金梁树荣
Owner XIAMEN HONGLU TUNGSTEN MOLYBDENUM IND CO LTD
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