Preparation method of intermediate-frequency sintering thorium-tungsten billets

A thoriated tungsten and intermediate frequency technology, which is applied in the field of preparation of intermediate frequency sintered thoriated tungsten blanks, can solve the problems of inability to carry out further processing, poor pressure processing performance, and low efficiency, and achieve good pressure processing performance, good performance, and reduce energy consumption. and the effect of hydrogen consumption

Active Publication Date: 2016-02-17
BGRIMM ADVANCED MATERIALS SCI & TECH
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Problems solved by technology

The density of thoriated tungsten billet produced by vertical melting method can reach 17.4~18.5g / cm 3 , the pressure processing performance is good, and it can be further processed into thoriated tungsten electrodes of different diameters with excellent welding performance, but the vertical fusion method has the disadvantages of high energy consumption, high hydrogen consumption, and low efficiency.
[0003] Compared with the preparation of thoriated tungsten billet by vertical melting method, the preparation of thoriated tungsten billet by intermediate frequency sintering method has the advantages of lower energy and hydrogen consumption and higher production efficiency, but the existing intermediate frequency sintering method produces thoriated tungsten billet , its density can only reach 16.7g / cm 3 , poor pressure processing performance, can not be further processed

Method used

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preparation example Construction

[0020] A method for preparing an intermediate frequency sintered thoriated tungsten billet, comprising the following steps:

[0021] Step 1, preparing thoriated tungsten powder doped with oxides of rare earth elements.

[0022] Wherein, in the thoriated tungsten powder doped with rare earth element oxides, the content of rare earth element oxides is 0.1-1.5% (by mass percentage), and the content of thorium oxide is 0.8-2.3% (by mass percentage); The Fischer grain size of the thoriated tungsten powder doped with rare earth element oxides is 1.2-2.2 μm.

[0023] Specifically, except for rare earth element oxides and thorium oxide, the remaining components in the thoriated tungsten powder doped with rare earth element oxides are tungsten powder (it should be noted that, limited by the purity of the raw materials themselves, the doped Thoriated tungsten powder of rare earth element oxides will inevitably contain a small amount of impurities). The methods for preparing thoriated ...

Embodiment 1

[0032] Prepare thoriated tungsten powder not doped with rare earth elements according to the method in the prior art; in the thoriated tungsten powder not doped with rare earth elements, the content of thorium oxide is 2.2% (by mass percentage), and the rest is tungsten; The Fischer particle size of thoriated tungsten powder not doped with rare earth elements is 1.4 μm.

[0033] The lanthanum tungsten powder is prepared according to the method in the prior art; in the lanthanum tungsten powder, the content of lanthanum oxide is 1.6% (by mass percentage), and the rest is tungsten; the Fischer particle size of the lanthanum tungsten powder is 1.5 μm.

[0034] Add lanthanum tungsten powder to the thoriated tungsten powder, and the doping amount of lanthanum tungsten powder satisfies the following relationship: in the thoriated tungsten powder mixed with lanthanum tungsten powder, the content of lanthanum oxide is 0.2% (by mass percentage According to calculations, it can be seen ...

Embodiment 2

[0038] Prepare thoriated tungsten powder not doped with rare earth elements according to the method in the prior art; in the thoriated tungsten powder not doped with rare earth elements, the content of thorium oxide is 2.1% (by mass percentage), and the rest is tungsten; The Fischer particle size of thoriated tungsten powder not doped with rare earth elements is 1.5 μm.

[0039] Add pure cerium oxide with a Fischer particle size of 1.2 μm into the thoriated tungsten powder, and the amount of cerium oxide added satisfies the following relationship: in the thoriated tungsten powder mixed with cerium oxide, the content of cerium oxide is 0.3 % (by mass percentage); it can be known through calculation that: in the thorium tungsten powder mixed with cerium oxide, the content of thorium oxide is 2.0937% (by mass percentage), and the balance is tungsten.

[0040] The thoriated tungsten powder doped with lanthanum oxide was mixed, and cold isostatic pressed to form a thoriated tungste...

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Abstract

The invention discloses a preparation method of intermediate-frequency sintering thorium-tungsten billets. The method comprises the steps that thorium-tungsten powder doped with rare earth element oxides is prepared, and the Fisher particle size of the thorium-tungsten powder is 1.2-2.2 micrometers; the thorium-tungsten powder doped with the rare earth element oxides includes, by mass, 0.1-1.5% of the rare earth element oxides and 0.8-2.3% of thorium oxides; the thorium-tungsten powder is mixed to be even, and green thorium-tungsten billets are formed by pressing; and the green thorium-tungsten billets are placed into an intermediate-frequency sintering furnace for intermediate-frequency sintering, the sintering temperature is 2300-2500 DEG C, the temperature is kept constant for 1-4 h, and then the thorium-tungsten billets are obtained. The density of the obtained thorium-tungsten billets is 17.4-18.5 g / cm<3>, the pressure processing performance is good, and the thorium-tungsten billets can be used for further processing thorium-tungsten electrodes of different diameters and with the excellent welding performance, so that the thorium-tungsten billets have the good performance, the production efficiency is improved, energy consumption and hydrogen consumption are lowered, and the production cost is reduced.

Description

technical field [0001] The invention relates to the technical field of preparation of thoriated tungsten blanks, in particular to a preparation method of intermediate frequency sintered thoriated tungsten blanks. Background technique [0002] At present, the widely used preparation method of thoriated tungsten billets is the vertical melting method, and its process generally includes doping to prepare thoriated tungsten powder, pressing and forming, pre-firing, and vertical melting to obtain thoriated tungsten billets. The density of thoriated tungsten billet produced by vertical melting method can reach 17.4~18.5g / cm 3 , the pressure processing performance is good, and it can be further processed into thoriated tungsten electrodes of different diameters with excellent welding performance, but the vertical fusion method has the disadvantages of high energy consumption, high hydrogen consumption, and low efficiency. [0003] Compared with the preparation of thoriated tungste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F3/10
CPCB22F1/0003B22F3/10B22F2998/10B22F1/052B22F3/02B22F3/1017B22F3/04B22F9/26
Inventor 于月光章德铭王磊徐振华李曹兵王芦燕卫致虎
Owner BGRIMM ADVANCED MATERIALS SCI & TECH
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