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Preparation method of electrode bar for PREP

A technology of electrode rod and melting electrode, which is applied in the field of metallurgy, can solve the problems of low efficiency and lower yield, and achieve the effect of uniform composition and simple operation

Inactive Publication Date: 2017-05-17
SINO EURO MATERIALS TECH OF XIAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has certain disadvantages. Because the raw materials need to be remelted several times in vacuum to ensure the homogeneity of the composition and structure, the efficiency is low.
Melting these ingots and reworking them into billets creates a lot of scrap, shavings, etc., essentially reducing yield

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A preparation method for a PREP electrode rod, comprising the following steps:

[0016] 1) Prepare an electrode rod with a diameter of 40mm and a length of 400mm. The roundness deviation of the electrode rod is 0.05mm, the straightness deviation is 0.08mm / 400mm, and the roughness is 1.4μm;

[0017] 2) Use the plasma heating source to melt the end of the electrode rod, the electrode rod rotates at a high speed of 10000r / min, brush out the melt droplet under the action of centrifugal force, and cool it into powder in argon;

[0018] 3) Sieve the powder in the receiving device;

[0019] 4) Recover the powder with unqualified particle size, fill it into a cylindrical sheath, and perform hot isostatic pressing to make an electrode rod. During filling, vibrate continuously, with a frequency of 10 Hz, an amplitude of 1 mm, and a filling speed of 30 kg / hour. 2×10 -2 Powder degassing is carried out at Pa.

[0020] The size of the sheath is adapted to the size of the electrode...

Embodiment 2

[0022] A preparation method for a PREP electrode rod, comprising the following steps:

[0023] 1) Prepare an electrode rod with a diameter of 60mm and a length of 600mm. The roundness deviation of the electrode rod is 0.05mm, the straightness deviation is 0.08mm / 600m, and the roughness is 1.1μm;

[0024] 2) Use the plasma heating source to melt the end of the electrode rod, the electrode rod rotates at a high speed of 20000r / min, brush out the melt droplet under the action of centrifugal force, and cool it into powder in helium;

[0025] 3) Sieve the powder in the receiving device;

[0026] 4) Recover the powder with unqualified particle size, fill it into a cylindrical sheath, perform hot isostatic pressing, and make an electrode rod, vibrate continuously during filling, with a frequency of 40 Hz, an amplitude of 1.1 mm, and a filling speed of 40 kg / hour. Pressed to 3×10 -2 Powder degassing is carried out at Pa.

[0027] The size of the sheath is adapted to the size of the...

Embodiment 3

[0029] A preparation method for a PREP electrode rod, comprising the following steps:

[0030] 1) Prepare an electrode rod with a diameter of 80mm and a length of 800mm. The roundness deviation of the electrode rod is 0.05mm, the straightness deviation is 0.08mm / 800mm, and the roughness is 1.5μm;

[0031] 2) Use the plasma heating source to melt the end of the electrode rod, the electrode rod rotates at a high speed of 30000r / min, brush out the melt droplets under the action of centrifugal force, and cool it into powder in the mixed gas of helium and argon ;

[0032] 3) Sieve the powder in the receiving device;

[0033] 4) Recover the powder with unqualified particle size, fill it into a cylindrical sheath, and perform hot isostatic pressing to make an electrode rod. During filling, vibrate continuously, with a frequency of 70 Hz, an amplitude of 1.5 mm, and a filling speed of 50 kg / hour. Pressure is 2.5×10 -2 Powder degassing is carried out at Pa.

[0034] The size of the...

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Abstract

A preparation method of an electrode bar for PREP comprises steps as follows: collected waste powder is loaded into a cylindrical sheath, vibrating compacting is performed in the powder loading process, the frequency ranges from 15 Hz to 60 Hz, and the vibration amplitude ranges from 0.1 mu m to 1.0 mu m. The size of the cylindrical sheath is required to meet the requirement of the electrode bar, and then degassing and sheath sealing welding are performed on special vacuum equipment; and the cylindrical sheath is subjected to hot isostatic pressing. Then the prepared electrode bar is subjected to machining and subsequent plasma atomization, collected powder is screened, and the waste powder is collected in a separate container and is loaded into the sheath for preparation of the powder after a certain amount of the waste powder is collected. With the method, the powder with the unqualified particle size can be completely recycled, and the yield is increased.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for preparing an electrode rod for PREP. Background technique [0002] The PREP method to prepare metal powder has been developed rapidly. The essence of this method is to use a plasma heating source to melt the end of the billet and form a liquid metal film at the end of the billet. Under the action of centrifugal force, the film flows to the edge of the billet and is separated from the billet in the form of small particles. Crystallize in an inert gas to form spherical metal powder particles. However, this method has certain disadvantages. The raw materials need to be remelted several times in vacuum to ensure the uniform composition and structure, resulting in low efficiency. Melting these ingots and reworking them into billets creates a lot of scrap, shavings, etc., which inherently reduces yield. On the other hand, the composition and purity of was...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/10
CPCB22F9/10
Inventor 徐伟梁书锦赵霄昊王琦张梅张平祥
Owner SINO EURO MATERIALS TECH OF XIAN CO LTD
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