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High strength and high toughness foamed SiC/Al material and its preparing method

A foam material, high-strength and high-toughness technology, used in the field of ceramic/metal composite mesh porous foam material and its preparation, can solve the problems of poor wear resistance, difficult preparation of porous ceramics, and insignificant effect, so as to improve the initial density and Tissue homogeneity, elimination of delamination, avoidance of dead skin voids

Inactive Publication Date: 2007-06-27
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Due to the singleness of the matrix skeleton material, the traditional mesh porous foam is either metal or ceramic, so its performance is limited, which in turn limits its versatility in use
Metal foam is easy to oxidize at high temperature, so that the strength is greatly reduced, and the hardness is generally not very high, and the wear resistance is poor, especially under the erosion of high temperature or even high pressure fluid, the performance deterioration is still significant.
Ceramic foam is resistant to high temperature and corrosion, but its thermal conductivity is not high, and its high temperature stability is poor. In particular, the inherent brittleness of ceramics has become the biggest obstacle to its use as a structural element, and there are insurmountable technical problems in processing and installation. Currently, ZrO 2 There are many studies on the toughening of the second relative ceramic materials such as particles or fibers, and there are also methods of preparing ceramic matrix composites to strengthen structural ceramics, but these methods are very difficult to apply to the preparation of porous ceramics, and the effect is not obvious. In the mesh porous foam, the metal and the ceramic are blended to form a continuous state of the base material and the reinforcement phase, and make the two form a three-dimensional continuous structure at the microscopic scale, so that the high toughness of the metal can be used for the ceramic phase base The three-dimensional connection of materials can increase the toughness of mesh porous foam ceramics, improve the brittle fracture resistance and thermal stability of foam ceramics, and many advantages of metal materials (such as Cu, Al, etc. have high thermal conductivity and high electrical conductivity) can also play a role in ceramics. Improve the related properties of foam ceramics, so that foam ceramics can obtain high strength, toughness, high hardness, strong oxidation resistance and wear resistance under the condition of high melting point, and have certain ductility and good thermal stability

Method used

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  • High strength and high toughness foamed SiC/Al material and its preparing method
  • High strength and high toughness foamed SiC/Al material and its preparing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The weight ratio is respectively 55%: 40%: 5% average particle size 5 μm silicon carbide powder, aminophenol-formaldehyde resin, p-toluenesulfonic acid are co-dissolved in dehydrated alcohol, make slurry, and described slurry solution solute is total 50% of the weight; cut polyurethane foam with a pore diameter of 2mm into the required size and immerse it evenly in the slurry, soak for 1 minute, take it out and squeeze off the excess slurry, air-dry and semi-cure at 50°C for 15 minutes, the above The process is repeated several times until the predetermined volume percentage of 30% (the volume percentage of the composite foam bars in the finished product) is reached. Then, put it into a high-pressure container, fill it with nitrogen to make the air pressure reach 15MPa, increase the temperature at a rate of 1°C per minute, raise the temperature to 230°C, and keep it warm for 1.5 hours to solidify. Under the protection of argon, it is pyrolyzed to form a carbon skeleton;...

Embodiment 2

[0048] The average particle size 2 μm silicon carbide powder, silicon powder, aminophenol-formaldehyde resin, and p-toluenesulfonic acid with a weight ratio of 40%: 20%: 35%: 5% are co-dissolved in absolute ethanol to make a slurry. The solute of the slurry solution is 60% of the total weight; the polyurethane foam with a pore size of 1 mm is cut into the required size and evenly immersed in the slurry, soaked for 1 minute, squeezed out the excess slurry after taking it out, and air-dried at 50°C Semi-cured for 30 minutes, the above process was repeated several times until reaching the predetermined volume percentage of 45% (the volume percentage of the composite foam tendons in the finished product). Then, put it into a high-pressure container, fill it with nitrogen to make the air pressure reach 12MPa, increase the temperature at a rate of 2°C per minute, raise the temperature to 250°C, and keep it for 1 hour to cure. Under the protection of argon, it is pyrolyzed to form a ...

Embodiment 3

[0050] Co-dissolve silicon carbide powder, silicon powder, epoxy resin (brand name EP0141-310) and p-toluenesulfonic acid with an average particle size of 3.5 μm in a weight ratio of 35%: 15%: 40%: 10% in absolute ethanol , make a slurry, the solute of the slurry solution is 45% of the total weight; the polyurethane foam with a pore diameter of 4mm is cut into the required size and immersed in the slurry evenly, soaked for 1 minute, and squeezed out after taking it out The excess slurry is air-dried and semi-cured at 50° C. for 10 minutes. The above process is repeated several times until the predetermined volume percentage of 25% (the volume percentage of the composite foam tendons in the finished product) is reached. Then, put it into a high-pressure container, fill it with nitrogen to make the air pressure reach 10MPa, increase the temperature at a rate of 5°C per minute, raise the temperature to 200°C, and keep it for 1.5 hours to solidify. Under the protection of argon, i...

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Abstract

The present invention relates to heterogeneous foamed ceramic / metal material, and is especially one kind of high strength and high toughness foamed SiC / Al material and its preparation process. The foamed SiC / Al material has basic units of closed polygonal ring to form connected 3D network structure, and each of the closed polygonal ring units is heterogeneous foamed ribs comprising SiC in 50-95 vol% and metal Al in 5-50 vol% and with the relative density not lower than 99 %. The foamed SiC / Al material is prepared through organic foam soaking, hot pressing to densify, pressure injection filling, thermal decomposition and reaction sintering. The preparation process is simple and low in cost.

Description

technical field [0001] The invention belongs to a ceramic / metal multiphase mesh porous foam material and its preparation technology, and particularly provides a high-strength and high-toughness SiC / Al foam material and a preparation method thereof. Background technique [0002] Mesh porous foam material is composed of matrix material skeleton, variable pore size, and high porosity. This kind of material has a three-dimensional network skeleton structure and the pores are interconnected. It is an important multifunctional material. At present, such foam materials mainly include foam metal and foam ceramics. Metal foam has multiple functions such as damping, sound, heat, and electromagnetic shielding. Its appearance is in line with the new trend of multifunctional structural materials, so it has developed rapidly in the past ten years. In addition to the general characteristics of porous ceramics, ceramic foam also has the characteristics of high permeability, high specific s...

Claims

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Application Information

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IPC IPC(8): C04B38/00C04B38/08C04B35/565C04B35/622C04B35/64
Inventor 张劲松田冲曹小明
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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