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A wear-resistant thermal shock-resistant composite material and its preparation method

A composite material, thermal shock resistance technology, applied in chemical instruments and methods, metal material coating technology, coating and other directions, can solve the problems of poor thermal shock resistance, brittle coating, etc., achieve excellent thermal shock resistance, Extended application range, high hardness effect

Inactive Publication Date: 2016-01-06
JIANGSU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] There are many kinds of anti-corrosion surface coating materials at room temperature, but under high temperature, especially high and low temperature alternating conditions, organic anti-corrosion coatings will age rapidly and lose their original functions, but if inorganic materials are used instead, the coating will be too brittle , making the thermal shock resistance of the material worse, so it is necessary to develop a surface coating material that has high mechanical properties under high temperature conditions without reducing or even improving the thermal shock resistance of the material

Method used

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  • A wear-resistant thermal shock-resistant composite material and its preparation method

Examples

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Effect test

example 1

[0021] 1: The addition amount of SiC whiskers is 20%, and the addition amount of A356 aluminum is 80%. The powder is uniformly ball-milled and then hot-pressed and sintered. The sintering temperature is 1800°C and the pressure is 39.2MPa. After heat preservation for 40 minutes, the block sample obtained by hot pressing was cut into regular rectangular parallelepiped samples and finely ground.

[0022] 2: Take an open container, fill it with a certain amount of water, add sodium nitrite and sodium carbonate, and make a concentration of 0.4% NaNO 2 and 0.2%Na 2 CO 3 Mix the solution, then add a certain amount of emulsifier (25% Ping Pingjia, 13% polyethylene glycol, 17% oleic acid, 45% triethanolamine), and finally make a mixed solution with a mass percentage concentration of emulsifier of 0.8%; After the solution is prepared, put the dried, cleaned and screened quartz sand (all passed through a 5-mesh sieve) in a bamboo basket, immerse it in the mixed solution, stir the aqueo...

Embodiment 1

[0025] The product obtained in Example 1 is at room temperature, and the surface of the coating is worn by a rotating friction grinding wheel for 1 min. The amount of wear of the surface coating material is extremely small, and the weight loss is less than 0.001g. Quickly transfer to the constant cooling for 1 hour and put it into the muffle furnace again. After several cycles, test its flexural strength and compare it with the flexural strength of the newly prepared material. It is found that after more than 20 cycles, the material is coated with The ply is largely intact, the flexural strength has dropped by about 25%, and the inner SiC aluminum matrix composite is intact.

example 2

[0027] 1: The addition of SiC whiskers is 20%, and the addition of A356 aluminum is 80%. The powder is uniformly ball-milled and then hot-pressed and sintered. The sintering temperature is 1800°C, the pressure is 39.2 MPa, and the heat preservation is 40 minutes. The block sample obtained by hot pressing is cut into regular cuboid samples and finely ground.

[0028] 2: Take an open container, fill it with a certain amount of water, add sodium nitrite and sodium carbonate, and make the concentration 0.4% NaNO 2 and 0.2%Na 2 C0 3 Mix the solution, then add a certain amount of emulsifier (25% Ping Pingjia, 13% polyethylene glycol, 17% oleic acid, 45% triethanolamine), and finally make a mixed solution with a mass percentage concentration of emulsifier of 0.8%; After the solution is prepared, put the dried, cleaned and screened quartz sand (all passed through a 5-mesh sieve) in a bamboo basket, immerse it in the mixed solution, and stir the aqueous solution. After the quartz san...

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Abstract

The invention relates to a high thermal-shock-resistant material, and particularly relates to a wear-resistant thermal-shock-resistant composite material and a preparation method thereof. The composite material comprises a matrix and a coating layer coated on the surface of the matrix. The preparation method comprises the following steps: preparation of a matrix A356 composite material, namely performing sand blast treatment on the matrix; preparation of coating materials, namely evenly mixing 45% of quartz powder, 5% of alumina, 5% of expanded perlite, 2% of kaolin, and 9-10% of high-temperature-resistant filler, blending together with 32% of inorganic adhesives, then adding 1-2% of reinforced fibers, evenly mixing at the room temperature to obtain the coating material; evenly arranging the prepared coating material on the surface of the matrix in a coating manner, naturally drying for 24h at the room temperature, and slowly increasing the temperature and curing, wherein the thickness of the coating layer is 2-3mm. the invention provides a method capable of greatly improving the thermal shock resistance of the material and guaranteeing the excellent mechanical property of the A356 aluminum-based composite material. The wear-resistant thermal shock-resistant composite material can be widely applied to the industries of electronic devices, magnetic materials, powder metallurgy and the like, even the aerospace field.

Description

technical field [0001] The invention relates to a high thermal shock-resistant material, in particular to a wear-resistant thermal shock-resistant composite material and a preparation method thereof. Background technique [0002] High thermal shock resistance materials have the characteristics of high temperature resistance, high strength and low thermal expansion coefficient, and are suitable for high-tech material manufacturing fields such as high-temperature structural components, aerospace materials, high-temperature observation windows, high-temperature catalyst carriers and filters, ceramic crucibles, and heat exchangers; With the rapid development of my country's modern high-tech industry and aerospace industry, the demand for high thermal shock resistance materials is becoming more and more urgent, and there are higher requirements for its thermal shock resistance performance. [0003] Most of the domestic patents for materials with excellent thermal shock resistance ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B15/04C22C21/00C22C32/00C23C24/00
Inventor 李惠焦雷汪闵
Owner JIANGSU UNIV OF SCI & TECH
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