Compact foamy thyrite in high intensity and preparation method

A technology of foamed silicon carbide and foamed ceramics, applied in ceramic products, other household utensils, applications, etc., can solve the problems of uneven distribution, limit the improvement of the strength of foamed silicon carbide ceramics, and high residual silicon content, and achieve specific compressive strength Improvement, uniformity of microstructure, and high strength

Inactive Publication Date: 2005-03-30
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

Research work in recent years has found that the residual silicon content in ceramic bars is too high (generally more than 20%), and the uneven distribution limits the improvement of the strength of foamed silicon carbide ceramics, which needs to be further solved

Method used

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  • Compact foamy thyrite in high intensity and preparation method
  • Compact foamy thyrite in high intensity and preparation method
  • Compact foamy thyrite in high intensity and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044]Co-dissolve silicon carbide powder with an average particle size of 2 μm, aminophenol-formaldehyde resin, and p-toluenesulfonic acid at a weight ratio of 60%: 35%: 5% in absolute ethanol to make the solids in the slurry: silicon carbide powder, high-yield carbon The weight of resin and curing agent is 40% of the total amount of slurry. After mechanical stirring, the ball milling time is 0.5 hours, filtered through a 35-mesh screen to make slurry, and the polyurethane foam with a pore size of 1mm is cut into the required size. Immerse evenly in the slurry, soak for 1 minute, take it out and squeeze out the excess slurry, air-dry and semi-cure in an oven at a temperature of 50°C for 10 minutes. The above-mentioned process is repeated many times until the desired weight of 30% predetermined volume fraction (the volume fraction of silicon carbide ceramics in the finished product) is reached. Then, put it into a high-pressure container, fill it with nitrogen to make the press...

Embodiment 2

[0046] The difference from Example 1 is:

[0047] Co-dissolve silicon carbide powder with an average particle size of 2 μm, epoxy resin (the brand name is EP0141-310), and p-toluenesulfonic acid with a weight ratio of 45%: 50%: 5% in absolute ethanol to make the solids in the slurry : The weight of silicon carbide powder, high-yield carbon rate resin and curing agent is 60% of the total amount of the slurry. After mechanical stirring, the ball milling time is 1 hour, filtered through a 55-mesh screen, and the slurry is made. Polyamine with an aperture of 2mm After cutting the fat foam into the required size, immerse it evenly in the slurry, soak it for 1 minute, take it out and squeeze out the excess slurry, after air-drying, semi-cure at 50°C for 10 minutes, repeat the above process several times until it reaches 20 % The weight required for a predetermined volume fraction (the volume fraction of silicon carbide ceramics in the finished product). Then, put it into a high-pre...

Embodiment 3

[0049] The difference from Example 1 is:

[0050] Silicon carbide powder, resin (30% of thermosetting phenolic resin, 70% of furfural resin) and oxalic acid weight ratio are 70wt%: 20wt%: 10wt%, thermosetting phenolic resin, furfural resin and oxalic acid are co-dissolved in absolute ethanol to make Slurry solution, and then evenly add silicon carbide powder with an average particle size of 5 μm into the above solution, so that the solids in the slurry: the weight of silicon carbide powder, high carbon yield resin and curing agent is 50% of the total amount of the slurry. After mechanical stirring, the ball milling time was 2 hours, and filtered through a 75-mesh sieve to make a slurry. Cut the polyurethane foam with a pore diameter of 2mm into the required size and immerse it evenly in the slurry, take it out and squeeze out the excess slurry, soak for 1 minute, air-dry and semi-cure at 60°C for 50 minutes, repeat the above process many times, Until the desired weight of 40%...

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Abstract

The invention provides a high strength compact foam silicon carbide ceramics material and the prodn method. Counting on weight percentage, the material is composed by silicon carbide 90-98 and silicon 10-2, silicon carbide powder and resin with high carbon-producing ration are mixed to slurry, expanded plastice is cut and soaked in the slurry, which is taken out, removing unnecessary slurry, then is treated by semisolidifying, high-temp, high-pressure solidifying, the solidified foam body is pyrolized to obtain foam carbon frame with same shape as original foam shape composed by silicon carbide and pylolized carbon, to open a centre hole on carbon frame by grinding, the silicon slurry is injected into the centre hole until filling by press injection, then is pylolized, by silicizing process, carbon in the carbon frame and gas or liquid phase silicen are reacted to generate silicon carbide and combined with original silicon carbide particles in carbon frame, thus to obtain high strength compact silicon carbide foam ceramics.

Description

technical field [0001] The invention relates to a foamed silicon carbide ceramic material, in particular to a high-strength and dense foamed silicon carbide ceramic material and a preparation method thereof. Background technique [0002] Foam ceramics are a special kind of porous ceramics. Its geometric structure is characterized by a polygonal closed ring as the basic unit, and a three-dimensional connected network formed by the interconnection of each basic unit. Because silicon carbide has excellent high temperature resistance, oxidation resistance, acid and alkali corrosion resistance, thermal shock resistance and semiconductor characteristics, the production and application of foamed silicon carbide ceramics have been widely valued. [0003] The current foamed silicon carbide ceramics are prepared by the following four methods: powder sintering method, solid state reaction sintering method, silicon resin pyrolysis method and vapor phase deposition method. [0004] The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/565C04B35/622C04B35/80C04B38/00
Inventor 张劲松曹小明田冲胡宛平杨永进
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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