A preparation method of a cathode containing a cesium compound and the cathode

A compound and cathode technology, which is applied in cold cathode manufacturing, electrode system manufacturing, discharge tube/lamp manufacturing, etc., can solve the problems of complicated impregnation process operation, low material utilization rate, and difficult control, so as to improve electron emission performance, The effect of high material utilization rate and low cost

Inactive Publication Date: 2015-11-25
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to provide a cesium-containing compound cathode for the technical defects of low material utilization, low efficiency, and high cost in the existing cathode substrate preparation process, as well as the technical defects of complicated operation and difficult control in the impregnation process. The preparation method can effectively control the microstructure of the cathode matrix such as porosity, pore size, uniformity of pore distribution, and through-porosity.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] According to weight percentage, 85% of titanium powder with a particle size of 6 μm and 15% of titanium hydride powder with a particle size of 5 μm were mixed evenly to obtain a raw material powder. According to the percentage by weight, take 30% of polyvinyl alcohol, 10% of vegetable oil, 20% of polyethylene, 8% of plasticizer, and 32% of paraffin and mix them at 140°C for 1 hour to obtain a binder. According to the volume ratio of 50:50, take the prepared binder and raw material powder into the mixer, mix at 140°C for 1.5 hours, then add it to the injection molding machine, set the injection temperature to 150°C, and the injection pressure to 90MPa to obtain A green body of the desired shape is required. The prepared green body was firstly placed in n-heptane to dissolve paraffin and vegetable oil components, then placed in deionized water at 70°C for 6 hours, and then placed in a hydrogen furnace to raise the temperature to 720°C at a slow heating rate of 5°C / min. °...

Embodiment 2

[0028] By weight percentage, the binder is composed of 60% paraffin, 20% high-density polyethylene, 15% polypropylene and 5% stearic acid. According to the volume ratio of 55:45, take the nickel powder with a particle size of 5 μm and the binder and mix them uniformly at 150°C with a mixer, then add them to the injection molding machine, set the injection temperature to 160°C, and the injection pressure to 100MPa to obtain A green body of the desired shape is required. The prepared green body was first soaked in trichlorethylene at 40°C for 4 hours to remove most of the paraffin and stearic acid in the green body, and then placed in a hydrogen furnace to raise the temperature to 500°C at a slow heating rate of 5°C / min. °C and keep it warm for 2 hours to remove the remaining organic matter in the green body, then raise the temperature to 1200°C at a fast heating rate of 10°C / min and keep it warm for 3 hours to obtain a porous cathode matrix. The porosity of the porous cathode m...

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Abstract

The invention relates to a preparation method of a cathode containing cesium chemical compounds and the cathode containing the cesium chemical compounds. The preparation method includes: uniformly mixing raw material powders and organic binding agents under 120-200 DEG C according to a volume fraction of 45-60%; feeding the mixture into an injection molding machine to obtain a green body; and firing the green body in a hydrogen furnace under 1100-2000 DEG C for 1-6 hours after removing the organic binding agents in the green body so as to obtain a porous cathode substrate, wherein the raw material powders are titanium powders, nickel powders, niobium powers, titanium hydride powders, tantalum hydride powders and / or zirconium hydride powders, and the cathode containing the cesium chemical compounds is obtained by steeping the obtained porous cathode substrate in an electron emission material solution containing the cesium chemical compounds for 10-80 seconds, suction filtering, drying, and placing the porous cathode substrate in a vacuum furnace under 200-700 DEG C to activate for 2-100 minutes. The cathode contains the porous cathode substrate and electron emission materials attached to the substrate, wherein the porous cathode substrate is manufactured from the raw material powders, and the electron emission materials are the cesium chemical compounds. The method is simple in process, and easy to control.

Description

technical field [0001] The invention relates to a cathode of a vacuum electronic device and a preparation method thereof, more specifically, to a preparation method of a cathode containing a cesium compound, and to the cathode. Background technique [0002] The function of the cathode of a vacuum electronic device is mainly to emit electrons, which consists of a porous cathode matrix (or called a sponge) and an electron-emitting material impregnated in the porous cathode matrix. The performance of the cathode is mainly determined by the pore size and pore size distribution of the cathode substrate, the type of electron emitter and the impregnation of the electron emitter. [0003] For porous cathode substrates, traditional powder metallurgy methods are usually used at present, such as cold pressing + sintering method, cold isostatic pressing + sintering method, although porous metal materials with higher porosity and open interconnected pore structure can be prepared, but ge...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01J9/02H01J1/02
Inventor 巫俊斌唐国翌宋国林
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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