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Y2O3-Gd2O3 system composite rare earth-molybdenum electron emission material and preparation method thereof

An electron emission material, y2o3-gd2o3 technology, applied in the direction of secondary electron emission electrode, light-emitting cathode manufacturing, discharge tube main electrode, etc., can solve problems such as poor electron emission performance, and achieve the effect of stable performance

Inactive Publication Date: 2011-06-15
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its secondary electron emission performance decays rapidly with the increase of voltage, that is, when the working voltage is high, its electron emission performance is poor.

Method used

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  • Y2O3-Gd2O3 system composite rare earth-molybdenum electron emission material and preparation method thereof
  • Y2O3-Gd2O3 system composite rare earth-molybdenum electron emission material and preparation method thereof
  • Y2O3-Gd2O3 system composite rare earth-molybdenum electron emission material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) 64.6634 grams of Y (NO 3 ) 3 , 22.9140 g Gd(NO 3 ) 3 Dissolve in absolute ethanol respectively, and filter the solution after complete dissolution. Weigh 120.0235 g of molybdenum trioxide powder and mix it with the filtered nitrate solution, and heat it in a water bath at 80°C, stirring continuously until the liquid evaporates completely.

[0024] (2) Decompose the powder obtained after evaporation at 500° C. under an air atmosphere until the nitrate is completely decomposed, and the N element in the powder is completely removed.

[0025] (3) Crushing and sieving the powder, and then reducing the powder under a hydrogen atmosphere. The reduction is carried out in two steps. First, keep the temperature at 500°C for 2 hours, then increase the temperature to 900°C for 2 hours, and then cool it with the furnace. The reduced powder is pressed and sintered to make a rare earth-molybdenum secondary electron emission material green body. The embryo body is machined in...

Embodiment 2

[0027] (1) 24.2488 grams of Y (NO 3 ) 3 , 51.5565 g Gd(NO 3 ) 3 Dissolve in absolute ethanol respectively, and filter the solution after complete dissolution. Weigh 120.0235 g of molybdenum trioxide powder and mix it with the filtered nitrate solution, and heat it in a water bath at 100°C, stirring continuously until the liquid evaporates completely.

[0028] (2) Decompose the powder obtained after evaporation at 550° C. under an air atmosphere until the nitrate is completely decomposed, and the N element in the powder is completely removed.

[0029] (3) Crushing and sieving the powder, and then reducing the powder under a hydrogen atmosphere. The reduction is carried out in two steps. First, keep the temperature at 500°C for 4 hours, then raise the temperature to 900°C and keep it for 4 hours, and then cool with the furnace. The reduced powder is pressed and sintered to make a rare earth-molybdenum secondary electron emission material green body. The embryo body is mach...

Embodiment 3

[0031] (1) 32.3318 grams of Y (NO 3 ) 3 , 45.8280 g Gd(NO 3) 3 Dissolve in absolute ethanol respectively, and filter the solution after complete dissolution. Weigh 120.0235 g of molybdenum trioxide powder and mix it with the filtered nitrate solution, and heat it in a water bath at 90°C, stirring continuously until the liquid evaporates completely.

[0032] (2) Decompose the powder obtained after evaporation at 550° C. under an air atmosphere until the nitrate is completely decomposed, and the N element in the powder is completely removed.

[0033] (3) Crushing and sieving the powder, and then reducing the powder under a hydrogen atmosphere. The reduction is carried out in two steps, first at 550°C for 3 hours, then raise the temperature to 900°C for 3 hours, and then cool with the furnace. The reduced powder is pressed and sintered to make a rare earth-molybdenum secondary electron emission material green body. The embryo body is machined into a Φ10*1mm rare earth molyb...

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Abstract

The invention discloses a Y2O3-Gd2O3 system composite rare earth-molybdenum electron emission material and a preparation method thereof, and belongs to the technical field of secondary electron emission materials. The prior secondary electron emission material cannot satisfy the higher electron emission requirements. The Y2O3-Gd2O3 system composite rare earth-molybdenum electron emission material and the preparation method thereof are characterized in that yttrium and gadolinium which are rare earth elements are used as additional elements, and are mixed into metal molybdenum in different proportions for the preparation of the cathode material. The Y2O3-Gd2O3 system composite rare earth-molybdenum electron emission material is obtained by mixing Gd2O3 and Y2O3 which are two rare earth oxides in any proportion, the mixed rare earth oxides account for 30 wt% of the gross weight of the emission material, and the balance is molybdenum. The Y2O3-Gd2O3 system composite rare earth-molybdenum electron emission material can be utilized to make rare earth-molybdenum secondary electron emission material, the secondary electron emission coefficient thereof is higher a lanthanum-containing cathode, optimum activation temperature is less than the lanthanum-containing cathode, and the emission performance is stable in a larger voltage range and is superior to a cerium-containing cathode.

Description

technical field [0001] Y 2 o 3 -Gd 2 o 3 The system composite rare earth-molybdenum electron emission material and its preparation belong to the technical field of secondary electron emission materials. Background technique [0002] In high-power electron tubes and magnetrons, thoriated tungsten (W-ThO 2 ) cathode as the emission source. The working temperature of thoriated tungsten cathode is as high as 1800°C, and it is brittle and difficult to process. Since thorium is a radioactive element with a long half-life, thoriated tungsten cathodes seriously threaten human health and the living environment during processing, production, and recycling of waste products. Many problems show that thoriated tungsten cathode is not an ideal cathode material today, and its substitute products must be developed. Previously, the secondary emission properties of lanthanum-containing rare earth-molybdenum cathodes have been developed [1, 2], and have been applied in some tube types. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01J1/32H01J9/12
Inventor 王金淑刘伟高非任志远周美玲左铁镛
Owner BEIJING UNIV OF TECH
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