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A kind of preparation method of ultra-large fine-grained molybdenum electrode

A molybdenum electrode, ultra-large technology, applied in the field of preparation of ultra-large fine-grained molybdenum electrodes, can solve the problems that affect the formation and quality of fine-grained structures, the amount of material deformation cannot be controlled, and cannot form fine-grained structures, etc., to overcome tempering Inhomogeneity, guaranteed performance, easy industrial production control effect

Active Publication Date: 2017-01-04
LUOYANG KEWEI MOLYBDENUM & TUNGSTEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the treatment method of this process is helpful to increase the compactness of the material, it cannot form a fine-grained structure.
[0004] In addition, there is a major defect in the prior art. In the forging process, the surface of the billet is directly forged, and the deformation of the material cannot be controlled during forging. The forging method seriously affects the fine-grained structure. formation and quality
[0005] In addition, the tempering temperature in the prior art is low-temperature tempering, and the tempering temperature is 450-500°C. Due to the low tempering temperature, the formation of the fine-grained structure of the product is severely damaged, and the product quality is affected.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0031] A method for preparing ultra-large fine-grained molybdenum electrodes, which is prepared by using molybdenum powder with a purity >99.95%, wherein the molybdenum electrodes have a diameter of 500-700mm and a length of 2500-3000mm.

[0032] Step 1. Take molybdenum powder with a particle size of 2.8-3.8μm, put it into the pre-prepared rubber mold, use 160-200MPa static pressure molding, and then place it in an intermediate frequency furnace. In a hydrogen atmosphere, keep the temperature at 1900-2000°C Sinter for 55-65 hours, after firing into a billet, set aside;

[0033] Step 2. Take out the fired billet from the intermediate frequency furnace, put it into the pre-made mold, control the temperature of the billet at 1350-1400°C, forge the billet mold, and control the deformation of the billet to <50% during forging. Forged into a rod-shaped member with a length of 2500-3000mm and a diameter of 500-700mm;

[0034] Step 3. Remove the mold, take out the forged rod-shaped m...

Embodiment 1

[0038] Embodiment one, A method for preparing ultra-large fine-grained molybdenum electrodes, which is prepared by using molybdenum powder with a purity >99.95%, wherein the molybdenum electrodes have a diameter of 500-700mm and a length of 2500-3000mm.

[0039] Step 1. Take molybdenum powder with a particle size of 2.8 μm, put it into the pre-prepared rubber mold, use 160MPa static pressure molding, and then place it in an intermediate frequency furnace. In a hydrogen atmosphere, keep the temperature at 1900°C for 55 hours and sinter. After the billet, spare;

[0040] Step 2. Take out the fired billet from the intermediate frequency furnace, put it into the pre-made mold, control the temperature of the billet to 1350°C, forge the billet mold, control the deformation of the billet <50% during forging, and forge Rod members with a growth length of 2500-3000mm and a diameter of 500-700mm;

[0041] Step 3. Remove the mold, take out the forged rod-shaped member, put it in a temp...

Embodiment 2

[0044] Embodiment two, A method for preparing ultra-large fine-grained molybdenum electrodes, which is prepared by using molybdenum powder with a purity >99.95%, wherein the molybdenum electrodes have a diameter of 500-700mm and a length of 2500-3000mm.

[0045] Step 1. Take molybdenum powder with a particle size of 3 μm, put it into the pre-prepared rubber mold, use 180MPa static pressure molding, and then place it in an intermediate frequency furnace. In a hydrogen atmosphere, keep the temperature at 1950 ° C for 60 hours to sinter the rod. After blank, spare;

[0046] Step 2. Take out the fired billet from the intermediate frequency furnace, put it into the pre-made mold, control the temperature of the billet to 1380°C, forge the billet mold, control the deformation of the billet to <50% during forging, and forge Rod members with a growth length of 2500-3000mm and a diameter of 500-700mm;

[0047] Step 3. Remove the mold, take out the forged rod-shaped member, put it in ...

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Abstract

The invention provides a preparation method of an ultra large fine-grain molybdenum electrode. The electrode is made of molybdenum powder with purity higher than 99.95 %, wherein the diameter of the molybdenum electrode is 500-700 mm, and the length thereof is 2500-3000 mm. The molybdenum powder is put in a rubber mold, molded under a static pressure and then placed in an intermediate frequency furnace. After being sintered under a hydrogen atmosphere to form a bar blank, the blank is placed in a mold; the mold is forged and then placed in a tempering furnace to form a fine-grain texture. The texture is then taken out to clean and dry to obtain the product. The method overcomes the process shortages of sintering and forging, and has simple process. The method is easy for industrial production control, reduces pollution, has low cost, improves the quality and greatly increases the production efficiency.

Description

technical field [0001] The invention relates to a method for preparing a molybdenum electrode, in particular to a method for preparing an ultra-large fine-grained molybdenum electrode made of pure molybdenum powder. Background technique [0002] At present, glass fiber yarn manufacturers often use molybdenum electrodes. Put the molybdenum electrodes into glass raw materials, melt the glass into liquid and draw them to make insulation cotton fibers. This kind of molybdenum electrodes requires high temperature resistance and compactness. properties and finer grain size, and at the same time, super large molybdenum electrodes with a diameter of 500-700mm and a length of 2500-3000mm are generally used in this field. Conventional preparation methods are mainly used to prepare molybdenum electrodes with smaller diameters. The electrode is mainly processed by extrusion or drawing forming process, and finally heat-treated and machined to form a molybdenum rod. This type of method re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/16B22F3/17B22F3/24C22F1/18
Inventor 张灵杰张二召
Owner LUOYANG KEWEI MOLYBDENUM & TUNGSTEN