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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, low production efficiency and uneven structure of monotectic alloy, so as to reduce the movement speed and suppress convection. , the effect of reducing tissue segregation

Inactive Publication Date: 2013-03-20
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

The invention relates to a method for preparing a monotectic alloy through casting by combining laser with high-intensity magnetic field, which is characterized by comprising the following steps: mixing the metal powder of all components of the monotectic alloy by mass percent according to the chemical components of the monotectic alloy to prepare the monotectic alloy powder with uniform particle size and good flowability; putting a copper casting mould with a circulating cooling water system in the center position of a high-intensity magnetic field device; and injecting the monotectic alloy powder into a CO2 laser beam heat source by a powder nozzle to melt the monotectic alloy powder quickly, wherein when the laser beam moves away, the molten monotectic alloy powder solidifies in the copper casting mould quickly, and the monotectic alloy is formed. According to the method, when the CO2 laser beam is used to heat and melt the monotectic alloy powder quickly, the high-intensity magnetic field is introduced, thus the convection of the melt is inhibited, the movement speed of the second-phase particles is reduced, and the tissue segregation and the hierarchical structure of the monotectic alloy are improved. Therefore, the method can be used for preparing the monotectic alloy with large size, uniform distribution of second-phase particles and high performance under the condition of high efficiency and low cost, and the problems that the monotectic alloy is hard to cast under the gravitational field condition, has nonuniform tissue distribution and is layered are solved.

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 Applications(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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