Composite melting pot for smelting magnesium and magnesium alloys

A magnesium alloy and composite technology, applied in the field of materials, can solve the problems of contamination of magnesium and magnesium alloy liquid, short service life, oxidation shedding, etc., and achieve the effects of avoiding oxidation and corrosion, long service life and low secondary pollution.

Inactive Publication Date: 2005-09-21
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the shortcomings of the prior art that the crucible is prone to corrosion penetration, oxidative shedding, contamination of magnesium and magnesium alloy liquid, and short service life during high temperature use, the present invention proposes a composite type crucible for smelting magnesium and magnesium alloys. crucible

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] In this embodiment, the inner layer is a silicon carbide ceramic material, the middle layer is a low-carbon steel plate with a thickness of 30 mm, and the outer layer is a nickel-based superalloy plate with a thickness of 2 mm.

[0016] Implementing:

[0017] First, the explosive welding method is used to combine the nickel-based superalloy steel plate and the low-carbon steel plate to form a bimetal composite steel plate;

[0018] The bimetal clad steel plate is processed into a bimetal clad crucible whose outer surface is made of nickel-based superalloy material and whose inner surface is made of low carbon steel.

[0019] The silicon carbide powder is uniformly deposited on the low carbon steel surface of the inner surface of the formed crucible by plasma spraying method to form a single-component ceramic phase coating with a thickness of about 1 mm, which is then ground and polished to form a composite crucible.

Embodiment 2

[0021] In this embodiment, the inner layer is a silicon nitride powder ceramic material, the middle layer is a medium carbon steel plate with a thickness of 25 mm, and the outer layer is a heat-resistant steel plate with a thickness of 3 mm.

[0022] Implementing:

[0023] First, the explosive welding method is used to combine the heat-resistant steel plate and the medium carbon steel plate into a bimetallic composite steel plate;

[0024] The bimetal clad steel plate is processed into a bimetal clad crucible whose outer surface is made of heat-resistant steel and whose inner surface is made of medium carbon steel.

[0025] Using laser cladding method, the silicon nitride powder material is evenly clad on the surface of the medium carbon steel on the inner surface of the formed crucible to form a silicon carbide ceramic coating with a thickness of about 3mm, which is then polished and polished to form a composite crucible. .

Embodiment 3

[0027] In this embodiment, the inner layer is a mixed powder ceramic material of silicon carbide and silicon nitride, the middle layer is an ordinary carbon steel plate with a thickness of 20 mm, and the outer layer is a nickel-based superalloy plate with a thickness of 4 mm.

[0028] Implementing:

[0029] First, the explosive welding method is used to combine the nickel-based high-temperature alloy steel plate and the ordinary carbon steel plate to form a bimetal composite steel plate;

[0030] The bimetal clad steel plate is processed into a bimetal clad crucible whose outer surface is made of nickel-based superalloy material and whose inner surface is made of common carbon steel.

[0031] Mix silicon carbide and silicon nitride powder uniformly at a ratio of 75:25, and then use laser cladding on the inner surface of the formed crucible to clad the pre-mixed and uniform composite ceramic powder on the surface of carbon steel to form a thickness of The silicon carbide / silic...

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Abstract

This invention provides a complex type crucible used in magnesium and magnesium alloy smelting. In order to conquer the problem of crucible easy corrosion and penetration, oxidizing desquamation, low quality and short life in high temperature, the crucible in this invention is compounded by ceramic material and double metal crucible made by heat-resisting steel or nickel base high-temperature alloy and carbon steel. The inner layer is the ceramic material that does not react with magnesium and magnesium alloy, central layer is carbon steel material, outer layer is heat-resisting steel or nickel base high-temperature alloy material. The connecting of double metal material is explosive bonding and the high temperature strength and creep resistant capability of crucible is increased, ceramic material form ceramic inner coating on carbon steel surface by spray coating or laser melting and coating technique. The outer layer make crucible not oxidation desquamation in high temperature, carbon steel avoids the high temperature oxidation, ceramic layer prevent crucible corroded by high temperature metal liquor and corrosion gas, the second pollution in smelting process is avoided. It can be used crude magnesium smelting purifying, and smelting preparing, melting and casting of magnesium alloy.

Description

(1) Technical field [0001] The invention relates to the smelting technology in the field of materials, and relates to a composite crucible for smelting magnesium and magnesium alloys. (2) Background technology [0002] my country is rich in magnesium resources, and the production of primary magnesium ranks first in the world. As the lightest metal structural material, magnesium alloy has a series of advantages such as low density, high specific strength and specific stiffness, good electrical conductivity, thermal conductivity, shock absorption and magnetic shielding, and recyclability, making it widely used in automobiles, It has been widely used in aircraft, computers and communication equipment. [0003] The higher the purity of magnesium and magnesium alloys, the better the corrosion resistance and the wider the application range. Raw magnesium must be melted, refined and alloyed to form commercial pure magnesium ingots or high-quality magnesium alloy ingots. The cruci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B26/22F27B14/10
Inventor 黄卫东刘建睿陈虎魁
Owner NORTHWESTERN POLYTECHNICAL UNIV
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