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Ceramic-base compound material and forming technique

A technology of composite materials and forming technology, which is applied in the field of ceramic matrix composite materials and forming, can solve problems such as limitations and complexity of forming process, and achieve the effects of high production efficiency, uniform density of structural components, and shortened degreasing time

Inactive Publication Date: 2009-03-18
肖青
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Among ceramic matrix composites, the toughening effect of fiber reinforced ceramic matrix composites is particularly significant, so it has attracted much attention from the ceramic industry, but due to the complexity of the forming process, and problems in reliability and cost, it is limited. its practical application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Commercial Al 2 o 3 Powder raw material, the average particle size of the particles is about 1μm, mixed with 5wt% ZrO 2 Nano powder, dissolve 20wt% of acrylamide and methylenebisacrylamide in deionized water to form a premix, the ratio of acrylamide and methylenebisacrylamide is 30:1, add 0.3 wt% Al 2 o 3 Organic dispersant of powder quality --- modified polyacrylic acid ammonium, then add 34vol% composite ceramic powder, and make a ceramic charge with viscosity <0.25Pas by stirring and ball milling, add 5ml ammonium persulfate to 1000g water Add the initiator to the billet, mix it evenly, and vacuum defoam, make SiC short fiber whiskers into a porous grid prefabricated body with a fiber content of 20%, put it in the mold, and then add the above-mentioned high solid content , Low-viscosity ceramic slurry is added to the feeding chamber of the injection machine. After the mold is closed, the fiber prefabricated body is injected, filled, and impregnated under pressure...

Embodiment 2

[0015] SiC powder, particle diameter is 0.6μm, and 3wt% (B 4 C+C) The powders are mixed, and 14wt% of ethylene oxide monomer and ethylene glycol are dissolved in deionized water to form a premixed liquid, and the ratio of ethylene oxide and ethylene glycol is 8:1. Add 0.3wt% dispersant of the mass of mixed ceramic powder --- tetramethylammonium hydroxide to the premixed liquid, and then add 57vol% volume fraction of composite ceramic powder, and make a dispersant with a viscosity of <0.25Pa·s by stirring ball milling The ceramic slurry is added in the blank according to the ratio of 1000g water plus Znil tetramethylethylenediamine.

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Abstract

The invention relates to a technology for shaping a ceramic-based composite material, which is integrated with principles of pressure injection, gel-casting and impregnating for preparing the ceramic-based composite material blank in complicated shape, even density of structure compositions and high strength so as to obtain a high-tenacity ceramic-based composite material product through sintering. The technology provided by the invention is a novel technology for shaping the ceramic-based composite material with high performance, complicated shape and fiber reinforcement, low cost and approximate net dimension. Compared with the prior art for shaping the fiber-reinforced ceramic-based composited material, the technology has the advantages of obvious superiority, short shaping time and high production efficiency.

Description

technical field [0001] The invention relates to a composite material and forming technology, in particular to a ceramic matrix composite material and forming technology. technical background [0002] Ceramic materials have been widely used as high-performance structural materials due to their high strength, high hardness, excellent wear resistance, high temperature resistance and corrosion resistance. All countries in the world regard structural ceramics as a high-tech new material that will play a major role in the future industrial revolution and give priority to research and development. However, due to the inherent brittleness of the ceramic material itself, it lacks sufficient reliability when used as a structural material, which greatly limits its application range. Over the years, ceramic workers have used different toughening mechanisms and different preparation techniques to prepare many different types of ceramic matrix composites, which have improved the brittlen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/624
Inventor 肖青
Owner 肖青
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