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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  • Abstract
  • Description
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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,

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

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Example Embodiment

[0054] Example 1

[0055] 1. SiC particle reinforced aluminum matrix composite preparation process

[0056] 1.1 Principle of vacuum stirring casting

[0057] The preparation of SiC particle-reinforced composites by vacuum stirring casting is to use the rotating motion of the stirring paddle to rotate the liquid surface of the aluminum alloy to generate vortices, so that the SiC particles enter the aluminum alloy matrix. Due to the vacuum and high temperature environment in the feeding bin, the surface layer of the SiC particles no longer adsorbs the air film, and at the same time it will not envelop the 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 fluids with different moving speeds. During the stirring process of the stirring blade, due to the influence of the stirring blade components, the viscosity of the aluminum alloy liquid and the friction of the crucible wall, The...

Example Embodiment

[0105] Example 2

[0106] Using the same special equipment as in Example 1, and following the same equipment operation method as in Example 1, the following process preparations of this example are completed:

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

[0108] Table 1 ZL111 alloy composition

[0109]

[0110] The steps involved are:

[0111] Step one: Put 1000g of ZL111 alloy in a graphite crucible, add 250g of SiC powder and 4g of Al-Sr master alloy modifier prepared in advance into the charging bin, and seal the furnace body and the charging bin body and vacuum.

[0112] The pre-preparation of SiC powder in this example 2 is the surface modification process. The process is as follows: 1) Add a 9% HF acid solution in the SiC with a volume fraction of 9%, and magnetically stir for 2.5 hours; 2) Pickling the good SiC powder is filtered, washed with distilled water to pH 7 and then filtered; 3) A...

Example Embodiment

[0122] Example 3

[0123] Using the same special equipment as in Example 1, and following the same equipment operation method as in Example 1, the following process preparations of this example are completed:

[0124] The alloy composition of the base ZL111 is the same as that of Example 2.

[0125] The preparation method includes the steps:

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

[0127] The pre-preparation of the SiC powder in this example 3 is the surface modification process. The process is: 1) add a 9% HF acid solution in the SiC with a volume fraction of 9%, and magnetically stir for 3 hours; 2) add the acid The washed SiC powder is filtered, washed with distilled water to pH 6-7.2, and then filtered; 3) Add anhydrous ethanol solution to the powder after pickling and filtering, ultrason...

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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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