Preparation device and preparation method for pressure infiltration-negative pressure adsorption combined metal-matrix composite material

A composite material and metal-based technology, applied in the field of metal-based composite material preparation, can solve the problems of slow speed, poor wettability, and difficulty in preparing reinforced phase distribution, and achieve the effects of uniform distribution, low infiltration pressure and fewer defects

Inactive Publication Date: 2019-03-01
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the poor wettability of many matrix metals (such as aluminum alloys), the speed of infiltration is very slow and it is difficult to prepare metal matrix composites with uniform reinforcement phase distribution, so the preform must be specially treated or infiltrated under high pressure.

Method used

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  • Preparation device and preparation method for pressure infiltration-negative pressure adsorption combined metal-matrix composite material
  • Preparation device and preparation method for pressure infiltration-negative pressure adsorption combined metal-matrix composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1: Preparation of silicon carbide particle-reinforced 6061 aluminum matrix composite material with a high volume fraction of 65%.

[0031] 1. Preparation of silicon carbide reinforced preform: select SiC fine particles of 10 μm and SiC coarse particles of 75 μm to be mixed at a ratio of 3:1, and two kinds of silicon carbide powders with different particle sizes are used as raw materials to prepare reinforced preforms. The specific steps are as follows:

[0032] (1) Cleaning: SiC was placed in NaOH solution, and after ultrasonic cleaning for 20 min, the NaOH solution was replaced and the cleaning was repeated once. Then rinse twice with distilled water, and dry in a constant temperature drying oven at 80°C for later use.

[0033] (2) Powder mixing: mix SiC with starch or glutinous rice flour, SiC volume percentage is 65%, pour into distilled water, add 5wt% water glass, 1wt% zinc stearate, suction filter after wet mixing 3h, will Put the powder in an oven at 80°...

Embodiment 2

[0043] Example 2: A silicon carbide particle reinforced 6061 aluminum matrix composite material with a volume fraction of 47% was prepared.

[0044] When preparing silicon carbide-aluminum matrix composites with a low volume fraction, SiC is mixed with starch or glutinous rice flour in the powder mixing stage of the preform, and the volume percentage of SiC is 47%. In the drying stage, the blank and the mold can be dried together. During pressure adsorption, the pressure of the high-pressure protective gas can be slightly lower, and the vacuum pressure of the lower chamber can be slightly higher, and the other stages are similar to those in Example 1.

Embodiment 3

[0045] Example 3: A silicon carbide particle-reinforced AZ91D magnesium-based composite material with a volume fraction of 67% was prepared.

[0046] When preparing silicon carbide particle-reinforced AZ91D magnesium-based composite materials, the binder can be sodium metasilicate and polyvinyl alcohol. Other preparation processes are similar to the preparation process of silicon carbide particle-reinforced aluminum-based composite materials, except that they are heated to 600 °C in the protective heating stage. It begins to melt at about ℃, pressure infiltration and negative pressure adsorption can be done at 680 ℃, the impregnation pressure is 0.2MPa, and the negative pressure adsorption pressure is 1KPa.

[0047] Such as figure 2 As shown in the microstructure photos, the reinforcements are evenly distributed, the structure is dense, the defects are less, and the infiltration effect is better.

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Abstract

The invention discloses a preparation device and a preparation method for a pressure infiltration-negative pressure adsorption combined metal-matrix composite material, and belongs to the field of metal-matrix composite materials. The invention aims at the problems of low infiltration speed and difficulty to prepare a metal-matrix composite material with uniform reinforcement phase distribution due to low wettability of many matrix metals (such as aluminum alloy), when the metal-matrix composite material is prepared through a pressure infiltration method, and designs a preparation device and apreparation method for a pressure infiltration-negative pressure adsorption combined metal-matrix composite material. The preparation device and the preparation method are capable of realizing the simultaneous progress of low-pressure infiltration and negative-pressure adsorption, and the metal-matrix composite material with the uniform reinforcement phase distribution is prepared.

Description

technical field [0001] The invention relates to a method and a device for preparing a metal-matrix composite material, belonging to the field of metal-matrix composite materials. Background technique [0002] Due to a series of excellent performance characteristics such as high strength, high modulus, high temperature resistance, good wear resistance, good thermal conductivity, small thermal expansion coefficient, good dimensional stability, and radiation resistance, metal matrix composites have gradually been used in many fields. The realization of commercial application has established the position as a new material and new technology. However, the manufacturing process of metal composite materials is complex and expensive, and has not yet been applied in industrial-scale production. The commonly used methods for preparing metal matrix composites mainly include powder metallurgy, stirred casting, infiltration, in-situ self-generation, etc. Among them, the infiltration met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D23/04
CPCB22D23/04
Inventor 马品奎李达赵泼夏凯欣任明文周晓丽李志刚管志平
Owner JILIN UNIV
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