Preparing method for SiC particle enhanced aluminum-base composite material

A composite device and feeding device technology, applied in the development and application of new materials, can solve the problems of enhancing the bonding force between particles and substrates, being unsuitable for mass production, and difficult to remove air films, avoiding harmful interface reactions, The effect of improved binding force and good fluidity

Active Publication Date: 2017-08-18
SUZHOU WUCHUANG MATERIAL TECH DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this paper, no effective pretreatment process is carried out on the SiC powder for the poor wettability of SiC and Al liquid, which enhances the insufficient bonding force between the particles and the matrix.
During the preparation process, the powder is put into the powder at one time through the observation port on the device, so that a large amount of powder is accumulated on the alloy melt, and more air is entrained in the gap between the powders, and the SiC fine powder is easy to agglomerate and gas-wrap on the high-temperature aluminum liquid During the stirring process, these air and SiC agglomerates are involved in the melt. In the article, the negative pressure degassing method of internal and external double stirring effectively removes the air bubbles in the alloy melt, but it is difficult to remove the air on the surface of the SiC particles. Thin films (ultimately exist in the microscopic gap between the particles and the matrix), and a large number of SiC aggregates need to be broken and dispersed uniformly at a speed of up to 1000-1200 rpm, which requires high equipment under vacuum conditions and is not suitable for large mass production

Method used

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  • Preparing method for SiC particle enhanced aluminum-base composite material
  • Preparing method for SiC particle enhanced aluminum-base composite material
  • Preparing method for SiC particle enhanced aluminum-base composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] 1. Preparation process of SiC particle reinforced aluminum matrix composites

[0056] 1.1 Principle of vacuum stirring casting

[0057] Vacuum stirring casting to prepare SiC particle-reinforced composite materials is to use the rotating motion of the stirring paddle under vacuum conditions to make the aluminum alloy liquid surface rotate and generate a vortex, so that SiC particles enter the aluminum alloy matrix. Due to the vacuum and high temperature environment in the feeding bin, the surface layer of SiC particles no longer absorbs the air film, and at the same time, it does not wrap air into the aluminum alloy melt. During the feeding process, according to the Bernoulli principle of the fluid, there will be a pressure difference between the fluids with different moving speeds. During the stirring process of the stirring paddle, due to the influence of the paddle member, the viscosity of the aluminum alloy liquid and the friction of the crucible wall, Different po...

Embodiment 2

[0106] Adopt the same special equipment of embodiment 1, according to the same equipment operation mode of embodiment 1, complete the following process preparation of the present embodiment:

[0107] The composition of the matrix ZL111 alloy (which already belongs to the prior art) is shown in Table 1, and the SiC particle size is 10-20 μm.

[0108] Table 1 ZL111 alloy composition

[0109]

[0110] Included steps are:

[0111] Step 1: Put 1000g of ZL111 alloy into a graphite crucible, add 250g of SiC powder and 4g of Al-Sr intermediate alloy modifier prepared in advance into the feeding bin, seal the furnace body and the feeding bin and vacuumize it.

[0112] The pre-preparation of SiC powder in this embodiment 2 is the surface modification process. The process is: 1) add HF acid solution with a volume fraction of 9% in the SiC, and magnetically stir for 2.5 hours; Filter the SiC powder, wash it with distilled water until the pH is 7, and then filter; 3) Add anhydrous eth...

Embodiment 3

[0123] Adopt the same special equipment of embodiment 1, according to the same equipment operation mode of embodiment 1, complete the following process preparation of the present embodiment:

[0124] The composition of the matrix ZL111 alloy is the same as in Example 2.

[0125] The preparation method comprises the steps of:

[0126] Step 1: Put 1000g of ZL111 alloy into the graphite crucible, add 350g of SiC powder and 7g of Al-Sr intermediate alloy modifier prepared in advance into the feeding bin, seal the furnace body and the feeding bin and evacuate them into a vacuum.

[0127] The pre-preparation of the SiC powder in Example 3, that is, the surface modification process, is as follows: 1) add an HF acid solution with a volume fraction of 9% in the SiC, and stir it magnetically for 3 hours; 2) add the acid solution to the SiC Filter the washed SiC powder, wash it with distilled water until the pH is 6-7.2, and then filter; 3) Add absolute ethanol solution to the powder af...

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Abstract

The invention aims at disclosing a specially-made vacuum smelting furnace and a preparing technology for a SiC particle enhanced aluminum-base composite material. A certain component proportion and a special smelting casting technology are adopted. The vacuum smelting furnace is adopted in the technology, overall closing and vacuum-state charging can be achieved, the inner temperature of melt can be measured in real time, the particles accurately fall into a melt vortex center with a certain speed and are evenly distributed in the melt under powerful stirring, the functions of deoxygenation and degassing can be effectively achieved on the composite material melt, and therefore the composite material uniform in component, low in porosity, high in mechanical performance and excellent in heat-conducting property can be produced through the technology. The crucible lifting type vacuum smelting furnace comprises a crucible composite device and lifting platform system, a stirring device and lifting platform system, a charging device, a vacuum system, a handheld lifting thermocouple, a sealing system and an electric control system.

Description

technical field [0001] The invention belongs to the development and application of new materials. Background technique [0002] Silicon carbide particle reinforced aluminum matrix composites have high specific strength, specific stiffness, elastic modulus, wear resistance, high temperature resistance, and good thermal conductivity. They are widely used in aviation, aerospace, automobile, electronics, transportation and other industrial fields Has been widely used. At present, there is still a lack of systematic and in-depth research on the composition and properties of silicon carbide particle-reinforced aluminum matrix composites, and most of the imported products are used in practical applications. The preparation methods of particle reinforced aluminum matrix composites mainly include powder metallurgy, pressure infiltration, spray deposition and stirring casting. Compared with other methods, the mechanical stirring casting method has the advantages of simple equipment ...

Claims

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Application Information

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IPC IPC(8): C22C1/10C22F1/043C22B9/04
CPCC22B9/04C22C1/1005C22C1/1036C22F1/043C22C1/1047
Inventor 何国球叶赟刘晓山蒋凯雁韩彦超戴礼权吕世泉张琛佘萌何乔
Owner SUZHOU WUCHUANG MATERIAL TECH DEV CO LTD
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