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Double-scale silicon carbide foam ceramic material and preparation method thereof

A technology of foamed ceramics and silicon carbide

Active Publication Date: 2013-03-13
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

[0003] Due to the large difference in the expansion coefficient between the silicon carbide foam ceramic skeleton and the metal, the metal generates tensile stress on the ceramic skeleton during the solidification and shrinkage process. This tensile stress causes the foam ceramic skeleton to produce cracks and the surface of the foam ceramic skeleton ribs The cracking combined with the metal interface affects the overall strengthening effect of the foam ceramic skeleton on the metal, which affects the performance of the silicon carbide foam ceramic composite material and restricts the application field of the composite material

Method used

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  • Double-scale silicon carbide foam ceramic material and preparation method thereof
  • Double-scale silicon carbide foam ceramic material and preparation method thereof
  • Double-scale silicon carbide foam ceramic material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] SiC powder (1.5μm-10μm), silicon powder, epoxy resin, and industrial alcohol are prepared into a slurry according to a certain ratio. Table 1 shows the proportions of silicon carbide ceramic slurries containing different proportions of pore-forming agents (silicon powder W5-8).

[0049] Table 1 Proportion of silicon carbide ceramic slurry

[0050]

[0051] Prepare slurry according to different contents of pore-forming agent silicon powder in Table 1, select polyurethane foam with a pore size of 1.5 mm, cut the polyurethane foam into the required shape and size, immerse it evenly in the slurry, take it out and squeeze it out. Remove the excess slurry, remove the excess slurry by air blowing or centrifugation, heat the semi-cured, repeat several times until the volume fraction is 20%, and obtain the silicon carbide foam ceramic precursor; wherein, the semi-cured is heated at a temperature of 150 ° C. Curing time 30 minutes;

[0052] Under the protection of argon, it ...

Embodiment 2

[0057] The difference from Example 1 is:

[0058] Prepare a slurry with silicon carbide powder (200nm-500nm), silicon powder, phenolic resin, and industrial alcohol in a certain proportion. Table 1 is the proportion of silicon carbide ceramic slurry containing different proportions of pore-forming agents (silicon powder W5-8). Prepare slurry according to 1# and 4# formulas in Table 1, select polyurethane foam with pore diameter of 1.5mm to soak and hang slurry, and hang slurry to volume fraction of 20% ( First use the 1# formula to hang the slurry to a volume fraction of 15%, and then use the 4# formula to hang the slurry to a volume fraction of 20%). Under the protection of argon, it is pyrolyzed to form a carbon skeleton. The heating rate is 3°C per minute, the temperature is raised to 800°C, and the temperature is kept for 0.5 hours. After pyrolysis, infiltration reaction sintering is carried out, the reaction temperature is 1780°C, the heating rate is 10°C / min, and the t...

Embodiment 3

[0062] The difference from Example 1 is:

[0063] The silicon carbide powder (10μm-15μm), silicon powder, phenolic resin, and industrial alcohol are prepared into a slurry according to a certain ratio. Table 1 shows the proportions of silicon carbide ceramic slurries containing different proportions of pore-forming agents (silicon powder W5-8). Prepare the slurry according to the 1# and 5# formulas in Table 1, select the polyurethane foam with a pore size of 1.5mm to soak the slurry, first hang the slurry according to the 5# formula to a volume fraction of 10%, and then press the 1# formula to hang the slurry to 20% volume fraction. Under the protection of argon, it is pyrolyzed to form a carbon skeleton. The heating rate is 3°C per minute, the temperature is raised to 1000°C, and the temperature is kept for 0.5 hours. After pyrolysis, infiltration reaction sintering is carried out, the reaction temperature is 1680°C, the heating rate is 5°C / min, and the temperature is maint...

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Abstract

The invention relates to the field of foam ceramics, in particular to double-scale foam ceramics with macro-scale three-dimensional communicated hole diameter and micron-grade three-dimensional communicated hole diameter and a preparation method thereof. The silicon carbide foam ceramics have a three-dimensional communicated network structure; a millimeter-grade hole diameter is expressed in macrography; and a micron-grade mutual communicated mesh is expressed in a ceramic skeleton rib. A hole forming agent is uniformly mixed into silicon carbide slurry in the process of moulding a foal ceramic blank so that the silicon carbide foam ceramics are made into double-scale foam ceramics; and the double-scale silicon carbide foam ceramics are three-dimensional communicated network foam ceramics which simultaneously have macro-millimetre scale hole diameter and skeleton rib internal micron scale hole diameter. By being used as a reinforced body of a ceramic / metal double-continuous phase composite material, the double-scale silicon carbide foam ceramic material can eliminate foam skeleton cracks in a composite material, improve composite quality and expand the application of the composite material in friction brake, armour protection, electronic packaging, and the like.

Description

technical field [0001] The invention relates to the field of foamed ceramics, in particular to a dual-scale foamed ceramics with both macroscale three-dimensional interconnected apertures and micron-scale three-dimensional interconnected apertures and a preparation method thereof. Background technique [0002] In the composite process of silicon carbide foam ceramics and metal (aluminum alloy, copper alloy), die casting process is used to press molten aluminum alloy (copper alloy) into the three-dimensional connected network of silicon carbide foam ceramics to prepare aluminum-based or copper-based composite materials. Materials, as light armor, friction brake pads, heat dissipation substrates, etc., are used in the fields of protection, aircraft and vehicle braking, and electronic packaging, which can produce considerable economic and social benefits. [0003] Due to the large difference in the expansion coefficient between the silicon carbide foam ceramic skeleton and the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/00C04B38/08C04B38/10C04B38/06C04B35/565
Inventor 张劲松曹小明田冲杨振明杨永进
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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