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Method for preparing monotectic alloy through casting by combining laser with high-intensity magnetic field

The technology of monotectic alloy and strong magnetic field is applied in the field of laser-strong magnetic field composite casting to prepare monotectic alloy, which can solve the problems of macrosegregation, uneven structure and low production efficiency of monotectic alloy, so as to reduce the moving speed and suppress convection. , the effect of increasing the cooling rate

Inactive Publication Date: 2014-09-17
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the vacuum heating furnace device is required in the process of preparing monotectic alloys by the strong magnetic field method, which leads to complicated operations and low production efficiency. The prepared monotectic alloys still have problems such as macrosegregation and uneven structure.

Method used

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  • Method for preparing monotectic alloy through casting by combining laser with high-intensity magnetic field
  • Method for preparing monotectic alloy through casting by combining laser with high-intensity magnetic field

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The Al-Pb binary monotectic alloy is prepared by laser-strong magnetic field composite melting and casting, and its chemical composition is Al-12 wt.%Pb. The specific implementation process is as follows figure 1 and figure 2 Shown:

[0023] (1) According to the chemical composition of the monotectic alloy, the aluminum powder with a purity of 99.9% and the lead powder with a purity of 99.9% are mixed at a mass ratio of 22:3, and added to the film-forming substance ethyl cellulose and mechanically stirred to prepare slurry;

[0024] (2) After mixing the prepared slurry evenly with a planetary ball mill, place it in a drying oven and dry it at 150°C, then mechanically grind it into monotectic alloy powder 8 with uniform particle size and good fluidity, and place it in In the loading hopper 7 of the side-axis automatic powder feeder 9;

[0025] (3) Insert the fastening bolt 21 into the bolt holes 24 and 24' of the left half-copper mold 22 and the right half-copper mol...

Embodiment 2

[0032] The Ni-Pb-Cu ternary monotectic alloy was prepared by laser-strong magnetic field composite melting and casting, and its chemical composition was 60 wt.% Ni-30 wt.% Pb-10 wt.% Cu. The specific implementation process was as follows figure 1 and figure 2 Shown:

[0033] (1) According to the chemical composition of the monotectic alloy, mix nickel powder with a purity of 99.9%, lead powder with a purity of 99.9% and copper powder with a purity of 99.9% in a mass ratio of 6:3:1, and add it to the film-forming substance Prepare slurry for mechanical stirring in acrylic resin;

[0034] (2) Mix the prepared slurry evenly with a planetary ball mill, place it in a drying oven and dry it at 200°C, and mechanically grind it into monotectic alloy powder 8 with uniform particle size and good fluidity, and place it in In the loading hopper 7 of the side-axis automatic powder feeder 9;

[0035] (3) Insert the fastening bolt 21 into the bolt holes 24 and 24' of the left half-copper...

Embodiment 3

[0042] The Fe-Sn-Ge system ternary monotectic alloy was prepared by laser-strong magnetic field composite melting and casting, and its chemical composition was 50 wt.% Fe-40 wt.% Sn-10 wt.% Ge. The specific implementation process was as follows: figure 1 and figure 2 Shown:

[0043] (1) According to the chemical composition of the monotectic alloy, mix iron powder with a purity of 99.9%, tin powder with a purity of 99.9% and germanium powder with a purity of 99.9% in a mass ratio of 5:4:1, and add it to the film-forming substance Prepare slurry for mechanical stirring in polyurethane resin;

[0044] (2) After mixing the prepared slurry evenly with a planetary ball mill, place it in a drying oven and dry it at 250°C, then mechanically grind it into monotectic alloy powder 8 with uniform particle size and good fluidity, and place it in In the loading hopper 7 of the side-axis automatic powder feeder 9;

[0045] (3) Insert the fastening bolt 21 into the bolt holes 24 and 24' ...

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Abstract

A method for preparing monotectic alloy by laser-strong magnetic field composite melting and casting. The method is characterized in that: firstly, according to the chemical composition of the monotectic alloy, the metal powders of each component are mixed according to the mass percentage, and are prepared to have uniform particle size and fluidity. Good monotectic alloy powder; then, place the copper mold with circulating cooling water system in the center of the strong magnetic field device, use the powder nozzle to spray the monotectic alloy powder into the CO2 laser beam heat source for rapid melting, when the laser beam moves After removal, the molten monotectic alloy powder solidifies rapidly within the copper mold and forms the monotectic alloy. The invention utilizes a CO2 laser beam to rapidly heat and melt monotectic alloy powder while introducing a strong magnetic field to suppress the convection of the melt, reduce the movement speed of second-phase particles, and improve the structure segregation and structural delamination of the monotectic alloy. Therefore, under the conditions of high efficiency and low cost, the present invention can prepare monotectic alloys with large size, uniform distribution of second phase particles and high performance, which overcomes the difficulty of casting under the condition of gravity field and the uneven structure distribution of conventional methods. The problem of homogeneity and stratification.

Description

technical field [0001] The invention relates to a method for preparing monotectic alloys, in particular to a method for preparing monotectic alloys by laser-strong magnetic field compound melting and casting. Background technique [0002] Monotectic alloys, also known as immiscible alloys, have many unique physical, chemical and mechanical properties. When the softer second phase particles are evenly dispersed and distributed on the matrix with higher hardness, the monotectic alloy has excellent self-lubricating characteristics and can be used as an automobile bearing material. When the second phase particles are uniformly dispersed and distributed on the substrate with good electrical conductivity, the monotectic alloy has both high electrical conductivity and high wear resistance, and can be used as an electrical contact material. When the second phase particles are uniformly dispersed and distributed on the matrix with good thermal conductivity, although the dispersed pa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/04B22F3/105B22D23/06B22D21/00
CPCY02P10/25
Inventor 周圣丰戴晓琴
Owner NANCHANG HANGKONG UNIVERSITY
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