Multi-component composite rare earth electron emission material and preparation method thereof

An electron emission material and multi-component composite technology, which are applied in the field of multi-component composite rare earth electron emission materials and their preparation, can solve the problems of thorium and tungsten containing radioactive elements, difficult processing, large size of plasma tungsten electrodes, etc. Low content, uniform distribution of rare earth components, and low electron work function

CN103769581BActive Publication Date: 2016-03-30BEIJING GENERAL RES INST OF MINING & METALLURGY +1

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Patent Information

Authority / Receiving Office: CN · China
Patent Type: Patents(China)
Current Assignee / Owner: BEIJING GENERAL RES INST OF MINING & METALLURGY
Publication Date: 2016-03-30

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Abstract

The invention discloses a multi-element composite rare earth electron emission material and a preparation method thereof, and belongs to the field of powder metallurgy. The material is a composite powder material made by adding rare earth oxide into tungsten metal matrix powder. The preparation method of the metrical takes the tungsten metal matrix powder, the rare earth oxide and nitrate as raw materials. The preparation method of mixed powder includes the steps: adding deionized water into the tungsten metal matrix powder to prepare turbid liquid; configuring the rare earth oxide and the nitrate into rare earth nitrate composite solution; adding the rare earth nitrate composite solution into the turbid liquid, uniformly stirring the turbid liquid, and heating and drying the turbid liquid to obtain the mixed powder. The mixed powder is subjected to two-step hydrogen reduction to prepare the composite powder material. The multi-element composite rare earth electron emission material prepared by the method is free from radioactive pollution, low in oxygen content and impurity content and uniform in rare earth element distribution and can be used for preparing plasma spraying and argon arc welding tungsten electrodes with low burning loss and long service life.

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Description

technical field

[0001] The invention relates to the technical field of powder metallurgy, in particular to a multi-component composite rare earth electron emission material and a preparation method thereof. Background technique

[0002] Plasma spraying has the advantages of a wide range of spraying materials, strong adaptability, and strong coating adhesion. It plays an important role in wear resistance, thermal barrier, corrosion resistance, insulation, radiation resistance, and catalysis.

[0003] Plasma spraying is to generate a DC arc between the cathode and the anode (nozzle). The arc heats and ionizes the introduced working gas into high-temperature plasma, which is ejected from the nozzle to form a plasma flame. The temperature of the plasma flame is very high, and its center temperature It can reach 32000K, and the temperature at the outlet of the nozzle can reach 16000~20000K. The flame velocity can reach 1000-2000m / s at the outlet of the nozzle, and the plasma spr...

Claims

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