Rare-earth oxide secondary emitting material and method for preparing same

A technology of rare earth oxides and emission materials, applied in the fields of rare earth metal compounds, chemical instruments and methods, inorganic chemistry, etc.

Inactive Publication Date: 2005-06-29
BEIJING UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The problem to be solved by the present invention is to use a single rare earth oxide or a composite rare earth oxide as the active material for secondary emission, the matrix material is W, Mo or Ta sponge, and the material has good secondary emission performance

Method used

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  • Rare-earth oxide secondary emitting material and method for preparing same
  • Rare-earth oxide secondary emitting material and method for preparing same
  • Rare-earth oxide secondary emitting material and method for preparing same

Examples

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Embodiment Construction

[0014] Example 1. Take La 2 O 3 The powder is a precursor, mixed with cotton gum, ethyl oxalate, and methanol, and ball milled for 60 hours, with a ball-to-material ratio of 300:80. Then mix with nitrocellulose and nitrocellulose to make a suspension. The suspension is immersed in the Mo sponge layer attached to the metal Mo sheet, the thickness of the sponge layer is 180 μm, the particle size of the powder used in the sponge layer is 40-60 μm, and the pore size is 40%. Dry it in an oven and sinter it under a hydrogen atmosphere to make La 2 O 3 - Mo spongy cathode, then made into a magnetron after degassing and activation treatment. The secondary emission coefficients tested at 600°C after different activation temperatures are determined by standard methods, see figure 1 , the life test data are shown in Table 1.

[0015] Example 2. Take Y 2 O 3 The powder is a precursor, mixed with cotton gum, ethyl oxalate, and methanol, and ball-milled for 60 hours with a ball-to-m...

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Abstract

It is a rare earth oxygen second emission material and its process method and belongs to electronic emitting material field. Its process method comprises the following steps: to use single rare earth oxygen or compound rare oxygen as material grinded powder to be mixed with pyroxylin, nitrify cotton organic agent to make the suspension turbid liquid; to process W, Mo or Ta sponge on their thin pad, wherein the powder in use has the particle diameter as fourth or sixty ª–m and hole diameter of fourth to sixty percent; to dip the suspension turbid into the sponge layer of w, Mo or Ta; to sinter in hydrogen gas or vacuum air under temperature 1800-2000íµ .

Description

technical field [0001] Rare earth oxide as a secondary emission material and a preparation method thereof belong to the field of electron emission materials. Background technique [0002] Magnetron is a widely used vacuum microwave device. Ba-W cathode is widely used in high-power applications. Due to the strong rebound of electrons, the service life and performance of Ba-W cathode will be reduced. More stable oxides are used as active substances for secondary emission in high-power magnetrons, currently ThO is used 2 . Considering the radioactive hazard of Th, a secondary emitting oxide with excellent emission performance and no harm is needed to replace it. Rare earth oxides, especially composite rare earth oxides, have good emission performance and stability, are environmentally friendly and can be exposed to the atmosphere, and can meet the requirements of high-power magnetrons. Contents of the invention [0003] The problem to be solved by the present invention is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F17/00H01J1/144H01J9/02H01J23/05
Inventor 王金淑周美玲刘伟
Owner BEIJING UNIV OF TECH
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