Method for preparing hollow iron-rich particle reinforced copper-based monotectic alloy through selective laser melting forming technology

A technology of laser selective melting and monotectic alloys, applied in the direction of additive processing, process efficiency improvement, additive manufacturing, etc., to achieve the effects of good electrical properties and soft magnetic properties, enhanced copper-rich matrix, and excellent mechanical properties

Active Publication Date: 2018-05-29
JINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use of laser selective melting forming technology to prepare hollow iron-rich particle reinforced copper-based monotectic alloys with excellent mechanical properties, electrical properties and magnetic properties has not been reported in the literature.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] The copper-based monotectic alloy reinforced with hollow iron-rich particles was prepared by laser selective melting. The size of the prepared one was 10mm×10mm×10mm (length×width×height). Evenly embedded in the face-centered cubic ε-Cu matrix, the hollow diameter is about 100nm; the tested performance is: the hardness is about 1.2 times that of brass, the impact toughness is 4.8 times that of brass, and the compressive strength is about 3 times that of brass , Under the conditions of room temperature and ±20kOe, the maximum saturation magnetization is 80emu / g, the coercive force is about 0.5Oe, and the conductivity is 70% IACS. The specific implementation process is as follows:

[0014] (1) The special copper-iron-based alloy powder is mechanically alloyed in a high-energy ball mill, and then placed in the hopper of the automatic powder scraper. The special copper-iron-based alloy powder is composed of pure copper powder and iron-based alloy powder according to the mas...

Embodiment 2

[0017] Hollow iron-rich particle-reinforced copper-based monotectic alloy was prepared by laser selective melting method. The prepared size was 20mm×20mm×20mm (length×width×height). Embedded in the face-centered cubic ε-Cu matrix; the hollow diameter is about 500nm; the detected performance is: the hardness is about 2 times that of brass, the impact toughness is 3.2 times that of brass, and the compressive strength is about 4.5 times that of brass. Under the conditions of room temperature and ±20kOe, the maximum saturation magnetization is 100emu / g, the coercivity is about 5Oe, and the conductivity is 65%IACS. The specific implementation process is as follows:

[0018] (1) The special copper-iron-based alloy powder is mechanically alloyed in a high-energy ball mill, and then placed in the hopper of the automatic powder scraper. The special copper-iron-based alloy powder is composed of pure copper powder and iron-based alloy powder according to the mass ratio It is composed of...

Embodiment 3

[0021]Hollow iron-rich particle-reinforced copper-based monotectic alloy was prepared by laser selective melting method. The prepared size was Φ30mm×300mm (diameter×height). The microstructural characteristics were: iron-rich particles with a particle size of about 10 μm were evenly embedded in the center of the face. In the cubic ε-Cu matrix; the hollow diameter is about 800nm; the detected performance is: the hardness is about 2.8 times that of brass, the impact toughness is 2.2 times that of brass, and the compressive strength is about 6 times that of brass. Under the condition of 20kOe, the maximum saturation magnetization is 120emu / g, the coercivity is about 10Oe, and the conductivity is 60%IACS. The specific implementation process is as follows:

[0022] (1) The special copper-iron-based alloy powder is mechanically alloyed in a high-energy ball mill, and then placed in the hopper of the automatic powder scraper. The special copper-iron-based alloy powder is composed of ...

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Abstract

The invention discloses a method for preparing a hollow iron-rich particle reinforced copper-based monotectic alloy through a selective laser melting forming technology. The method is characterized bycomprising the following steps that special copper-iron-based alloy powder is subjected to mechanical alloying treatment so as to obtain composite powder to serve as a forming material, wherein the the particle size of the composite powder is 35-50 microns, and the composite powder is composed of a supersaturated copper-iron solid solution with a face-centered cubic crystal structure; and based on a liquid-phase separation principle and a Kirkandall effect, the hollow iron-rich particle reinforced copper-based monotectic alloy is prepared by adopting a selective laser melting method, whereinthe special copper-iron-based alloy powder is composed of pure copper powder and iron-based alloy powder according to a mass ratio of 95:5, 92:8 or 88:12, the iron-based alloy powder comprises the following chemical components, by weight percentage: 72.5wt% of Fe, 12wt% of Ni, 5.0wt% of Nb, 5.0wt% of Cr, 0.6wt% of Si, 2.5wt% of B, 0.2wt% of C, and 0.2wt% of Ce2O3.

Description

technical field [0001] The invention relates to a method for forming hollow iron-rich particle-reinforced copper-based monotectic alloys by laser selective melting, and belongs to the technical field of laser additive manufacturing. Background technique [0002] The unique solidification mechanism of monotectic alloys: phase separation of liquid immiscible systems and phase transition kinetics such as precipitation, coarsening and migration of second phases, as well as the unique microstructure and performance characteristics of homogeneous monotectic alloys have attracted the attention of the material science community. widespread attention. For example, homogeneous monotectic alloys with unique physical and mechanical properties can be used as self-lubricating materials and have become ideal new bearing alloys in the automotive industry; monotectic alloys with dispersed second-phase particles have superconducting properties, It can be used to make superconducting material...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/105B33Y10/00B22F1/00C22C9/00
CPCC22C9/00B33Y10/00B22F2998/10B22F10/00B22F10/34B22F10/36B22F10/28B22F10/366B22F12/41B22F10/47B22F1/09B22F1/0003B22F10/20Y02P10/25B22F1/00
Inventor 周圣丰戴晓琴谢敏
Owner JINAN UNIVERSITY
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