Preparation method for rare-earth tungsten electrode material

An electrode material, rare earth tungsten technology, applied in the field of tungsten metallurgy, can solve the problems of high rare earth second phase content, low processing yield, long process flow, etc. The effect of advanced technology

Active Publication Date: 2015-03-18
GANZHOU HONGFEI TUNGSTEN & MOLYBDENUM MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are defects such as long process flow, powder morphology and particle size distribution not suitable for cold isostatic pressing, high sintering temperature, low retention of rare earth second phase in tungsten rod, uneven dispersion, and low processing yield
The results of the existing patents ZL 200710099088.7 and ZL 200710099090.4 show that the yield is less than 80%

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A preparation method of a rare earth tungsten electrode material, comprising the following steps:

[0020] 1. Pre-reduction, select the ammonium paratungstate that conforms to the APT-0 grade in GB / T10116-2007, adopt a four-zone temperature zone reduction furnace, the temperature system is 350°C, 380°C, 420°C, 450°C, and the hydrogen flow rate is 0.35m 3 / h, mildly reduced to produce tetragonal ammonium tungsten bronze (ATB for short) with a Fischer particle size of 10 μm;

[0021] 2. Doping, using the company's utility model patent - blue tungsten doping dryer (ZL 201220438481.0), wet-doping ammonium tungsten bronze into cerium oxide (CeO 2 ) 2.1% cerous nitrate solution, after stirring, mixing, and 0.30Mpa steam drying, cerous nitrate is adsorbed in the pores of ammonium tungsten bronze, and cerium oxide (CeO 2 ) is 2.1% cerium-doped ammonium tungsten bronze;

[0022] 3. Hydrogen reduction, the cerium-doped ammonium tungsten bronze is used in a six-zone temperature ...

Embodiment 2

[0030] A preparation method of a rare earth tungsten electrode material, comprising the following steps:

[0031] 1. For pre-reduction, select ammonium paratungstate conforming to the grade of APT-0 in GB / T10116-2007, adopt a four-zone temperature zone reduction furnace, the temperature system is 320°C, 380°C, 420°C, 460°C, and the hydrogen flow rate is 0.40m 3 / h, mildly reduced to produce tetragonal ammonium tungsten bronze (ATB for short) with a Fisher grain size of 10.5 μm;

[0032] 2. Doping, using the company's utility model patent - blue tungsten doping dryer, wet ammonium tungsten bronze mixed with lanthanum oxide (La 2 o 3 ) 1.6% lanthanum nitrate solution, after stirring, mixing, and steam drying at 0.30Mpa, lanthanum nitrate is adsorbed in the pores of ammonium tungsten bronze to obtain lanthanum oxide (La 2 o 3 ) 1.6% ammonium tungsten bronze;

[0033] 3. Hydrogen reduction, the lanthanum-ammonium tungsten bronze is reduced in a six-zone temperature zone reducti...

Embodiment 3

[0041] A preparation method of a rare earth tungsten electrode material, comprising the following steps:

[0042] 1. For pre-reduction, select ammonium paratungstate conforming to the APT-0 grade in GB / T10116-2007, adopt a reduction furnace with four temperature zones, and the temperature system is 320°C, 360°C, 410°C, 450°C, and the hydrogen flow rate is 0.35m 3 / h, mildly reduced to produce tetragonal ammonium tungsten bronze (ATB for short) with a Fisher grain size of 10.5 μm;

[0043] 2. Doping, using the company's utility model patent - blue tungsten doping dryer, wet ammonium tungsten bronze mixed with yttrium oxide (Y 2 o 3 ) 3.5% yttrium nitrate solution, after stirring, mixing, and 0.25Mpa steam drying, yttrium nitrate is adsorbed in the pores of ammonium tungsten bronze to obtain yttrium oxide (Y 2 o 3 ) 3.5% ammonium tungsten bronze;

[0044] 3. Hydrogen reduction, the yttrium-doped ammonium tungsten bronze is used in a six-zone temperature zone reduction furnac...

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Abstract

The invention provides a preparation method for a rare-earth tungsten electrode material. The preparation method includes prereduction, mixing, hydrogen reduction, forming, presintering, vertical sintering, medium-frequency inductive sintering and the like. According to the preparation method, refining and even dispersing of the second phase of rare earth are set as the objective, a tungsten composite is taken as a new direction for preparing the high-performance electrode material, quartet ammonium-tungsten bronze is selected as a doping raw material, and proprietary equipment doping, one-step reduction of the ammonium-tungsten bronze, medium-temperature vertical sintering and medium-frequency inductive sintering are performed to complete the process. By the preparation method, the problems such as serious unevenness of grain thickness of the second phase of the rare earth of the electrode material, large volatilization loss, low processing yield, high energy consumption, poor welding performance are solved. The processing yield is larger than 85%, and comprehensive power consumption is reduced by more than 10%. The preparation method has the advantages of advanced technology, short technological process, small and even rare earth phase of the electrode material, stable quality, good processing and using performance, easiness in mass production and the like.

Description

technical field [0001] The invention relates to tungsten metallurgy technology, in particular to a preparation method of a rare earth tungsten electrode material. Background technique [0002] Tungsten has the characteristics of high melting point, good high-temperature strength, and strong thermionic emission capability. Tungsten-based materials with rare earth elements such as cerium, lanthanum, and yttrium added with low electron work function are best used in thermionic emission materials, and are widely used in inert materials. Gas shielded welding, plasma welding, cutting, thermal spraying and electric vacuum and other fields. Its emergence and development have led to the development of welding technology. The construction of large structural parts such as skyscrapers, long-span bridges, pressure pipeline containers, and ships cannot do without argon arc welding technology. There are not only requirements for reliability and stability of electrode materials, but also ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/32B23K35/40
CPCB23K35/32B23K35/402
Inventor 闵邦平胡元钧王竹青曾巧华巫晓华刘希星陈广李晶杜海滨胡旭李国欢曾小磊
Owner GANZHOU HONGFEI TUNGSTEN & MOLYBDENUM MATERIALS
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