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Process for manufacturing large-sized molybdenum rods

A production process and molybdenum rod technology, which is applied in the field of large-scale molybdenum rod production process, can solve the problems of large grain size, complex process, and difficulties, and achieve stable material grain structure, simple preparation process, and improved high temperature resistance. Effect

Active Publication Date: 2014-07-09
LUOYANG KEWEI MOLYBDENUM & TUNGSTEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, manufacturers of electrodes are gradually using molybdenum rods as components. Due to its good performance, more and more manufacturers use them. The preparation method of molybdenum rods with smaller lengths is mainly processed by extrusion or drawing. , and finally heat-treated and machined to form molybdenum rods. This type of method requires high equipment, complicated processes, and high cost. Moreover, it is very difficult to produce large single-weight molybdenum rods with a length of more than 2 meters due to their large length. , and the prepared molybdenum rods have poor high temperature resistance, poor compactness and large grain size, and the prepared large single-weight molybdenum rods with a length greater than 2 meters do not meet the electrode specifications at all.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Embodiment one: A manufacturing process of a large molybdenum rod, the length of the molybdenum rod is greater than 2 meters, and the manufacturing steps are as follows:

[0013] Step 1. Put the molybdenum powder with a particle size of 1.6-2.5μm and a purity of ≥99.98% into a rubber mold to prepare a solid powdery molybdenum billet, and then use a cold isostatic press to form it with a pressure of 300Mpa for 10 minutes Solid billet forming;

[0014] Step 2. Put the formed solid billet into an intermediate frequency sintering furnace, and put hydrogen into the furnace. The heating temperature is 1800°C, and the heating time is 27 hours. After that, the water circulation is used to cool down for 9 hours, and then it is naturally placed to cool to room temperature. , the formed bar blank is ready for use;

[0015] Step 3. Heat the formed billet processed in step 2 to 1500°C for 1 hour. After taking it out, hit it 15 times with a 700 kg air hammer, then stretch it to the...

Embodiment 2

[0017] Embodiment two: A manufacturing process of a large molybdenum rod, the length of the molybdenum rod is greater than 2 meters, and the manufacturing steps are as follows:

[0018] Step 1. Put molybdenum powder with a particle size of 1.6-2.5μm and a purity of ≥99.98% into a rubber mold to prepare a solid powdery molybdenum billet, and then use a cold isostatic press to form it at a pressure of 350Mpa for 12 minutes Solid billet forming;

[0019] Step 2. Put the formed solid billet into an intermediate frequency sintering furnace, and put hydrogen into the furnace. The heating temperature is 1825°C, and the heating time is 27 hours. After that, the water circulation is used to cool down for 9.5 hours, and then it is cooled to room temperature and formed. Bar blank spare;

[0020] Step 3. Heat the formed billet processed in step 2 to 1550°C for 1.5 hours. After taking it out, hit it 20 times with a 700 kg air hammer, stretch it to the required size, and put the molybden...

Embodiment 3

[0022] Embodiment three: A manufacturing process of a large molybdenum rod, the length of the molybdenum rod is greater than 2 meters, and the manufacturing steps are as follows:

[0023] Step 1. Put molybdenum powder with a particle size of 1.6-2.5 μm and a purity of ≥99.98% into a rubber mold to prepare a solid powdery molybdenum billet, and then use a cold isostatic press to form it with a pressure of 350Mpa for 15 minutes Solid billet forming;

[0024] Step 2. Put the formed solid billet into an intermediate frequency sintering furnace, and put hydrogen into the furnace. The heating temperature is 1850°C, and the heating time is 27 hours. After that, the water circulation is used to cool down for 10 hours, and then cooled to room temperature. Forming Bar blank spare;

[0025] Step 3. Heat the formed billet processed in step 2 to 1600°C for 2 hours. After taking it out, hit it 25 times with a 700 kg air hammer, then stretch it to the required size, and finally put the mo...

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Abstract

A large-scale molybdenum rod production process, the production steps are as follows: put molybdenum powder into a rubber mold sleeve to prepare a solid powdery molybdenum billet, and then use a cold isostatic press to form a solid billet; The solid billet is put into the intermediate frequency sintering furnace, and then cooled by water circulation for 9-10 hours, and the formed billet is ready for use; the formed billet is heated to 1500-1600°C for 1-2 hours, and the molybdenum rod is machined. Complete, the preparation process of this method is simple, and the equipment requirements are not high, so the input cost is relatively low. Firstly, a solid powdery molybdenum billet is prepared and then pressed to form a solid billet, and then recrystallized in a high-temperature environment for the second time, and the crystal grains are fine The grain size is reduced from the millimeter level to the micron level, the grain structure is optimized, and the relative density reaches more than 99.95%.

Description

technical field [0001] The invention relates to a manufacturing process of molybdenum rods, in particular to a manufacturing process of large molybdenum rods. Background technique [0002] At present, manufacturers who produce electrodes gradually use molybdenum rods as components. Due to its good performance, more and more manufacturers use them. The preparation method of molybdenum rods with smaller lengths is mainly processed by extrusion or drawing. , and finally heat-treated and machined to form molybdenum rods. This type of method requires high equipment, complex processes, and high cost. Moreover, it is very difficult to produce large single-weight molybdenum rods with a length of more than 2 meters due to their large length. , and the prepared molybdenum rods have poor high temperature resistance, poor compactness and large grain size, and the prepared large single-weight molybdenum rods with a length greater than 2 meters do not meet the electrode specifications at...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/16B22F3/04B22F5/00
Inventor 张灵杰
Owner LUOYANG KEWEI MOLYBDENUM & TUNGSTEN