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Method for rapidly preparing inorganic fiber-enhanced ceramic composite material

A technology of inorganic fibers and composite materials, applied in the field of inorganic non-metals, can solve problems such as poor strength of ceramic parts, and achieve the effects of good thermal stability, rapid prototyping, and high specific mold

Inactive Publication Date: 2017-08-15
HUAZHONG UNIV OF SCI & TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The direct coagulation casting Via High Valence Counter Ions (DCC-HVCI) is a ceramic colloidal molding method based on the direct coagulation injection molding process, which combines the direct coagulation injection molding process Contrary to the classic colloidal stability theory, the existing technology works simultaneously through the controllable release of high-priced counter ions and the adjustment of the pH of the slurry to the isoelectric point, so that the slurry can be solidified quickly. The green body formed by this method has fewer cracks and does not require debinding , high dimensional accuracy, short curing time, etc., but the strength of ceramic parts formed by this method is still poor, which is not enough to meet the needs of modern society for high-performance ceramics

Method used

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  • Method for rapidly preparing inorganic fiber-enhanced ceramic composite material
  • Method for rapidly preparing inorganic fiber-enhanced ceramic composite material
  • Method for rapidly preparing inorganic fiber-enhanced ceramic composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 6.25g / L calcium iodate, 1.0wt% diacetin cured 3.0wt% tetramethylammonium hydroxide dispersed 10wt% alumina fiber and 50vol% silica slurry.

[0037] 50g of silica powder, 5.0g of alumina fiber, 1.5g of tetramethylammonium hydroxide and 18.87g of deionized water were milled for 2 hours at a ball milling rate of 250r / min to prepare a particle surface with a solid phase volume fraction of 50%. Negatively charged ceramic slurry, then add 0.25g calcium iodate, mix and mill at a ball milling speed of 180r / min for 15min, then add 0.5g glycerol diacetate, stir and degas with a magnetic stirrer for 5min under vacuum conditions, Cast a non-porous silicone mold, place it at 70°C for 30 minutes and demould it, dry it at 80°C for 24 hours, then raise the temperature to 1300°C at a rate of 5°C / min and keep it warm for 2 hours, then drop it to 1300°C at a rate of 5°C / min At room temperature, the flexural strength of the obtained ceramic matrix composite is 27.6% higher than that withou...

Embodiment 2

[0039] 6.0g / L nickel iodate, 0.5wt% glycerol triacetate solidified 1.5wt% ammonium polyacrylate dispersed 15wt% zirconia fiber and 55vol% alumina slurry.

[0040] Mix 50g of alumina powder, 7.5g of zirconia fiber, 0.75g of ammonium polyacrylate and 10.23g of deionized water, and ball mill for 0.5h at a ball milling rate of 400r / min to prepare a particle surface with a solid phase volume fraction of 55%. Negatively charged ceramic slurry, then add 0.12g nickel iodate, mix ball milling at a ball milling speed of 100r / min for 5min, then add 0.25g triacetin, stir and degas with a magnetic stirrer under vacuum conditions for 15min, Cast a non-porous silicone mold, place it at 35°C for 40 minutes, then demould it, dry it at 100°C for 12 hours, then heat it up to 1150°C at a rate of 3°C / min and keep it warm for 6 hours, then drop it to 1150°C at a rate of 3°C / min. At room temperature, the flexural strength of the obtained ceramic matrix composite is 28.7% higher than that without add...

Embodiment 3

[0042] 8.0g / L barium iodate, 1.5wt% ethyl acetate solidified 1.0wt% urea dispersed 35wt% carbon fiber and 50vol% silicon carbide slurry.

[0043] Mix 50g of silicon carbide powder, 17.5g of silicon carbide fiber, 0.5g of ammonium polyacrylate and 15.6g of deionized water, and ball mill for 12 hours at a ball milling rate of 200r / min to prepare a particle surface belt with a solid phase volume fraction of 50%. Negatively charged ceramic slurry, then add 0.25g barium iodate, mix ball milling at 150r / min ball milling speed for 30min, then add 0.75g ethyl acetate, stir and degas with magnetic stirrer under vacuum condition for 10min, cast without Hole silica gel mold, put it at 85°C for 10min and demould, dry at 60°C for 24h, then raise the temperature to 2200°C at a heating rate of 20°C / min and keep it for 4h (sintering under vacuum condition), and at 20°C / min When the cooling rate drops to room temperature, the flexural strength of the obtained ceramic matrix composite is 31.7% ...

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Abstract

The invention belongs to the technical field of inorganic non metal, and concretely relates to a method for rapidly preparing an inorganic fiber-enhanced ceramic composite material. The method comprises the following steps: ceramic powder, inorganic fiber, a dispersant and deionized water are uniformly mixed through ball milling, the uniform ceramic slurry with negative electricity is on the surface of ceramic powder particles; a curing agent containing high-valence counter ions is added and is subjected to ball milling; an esters pH conditioning agent is added in the obtained slurry; then the material is stirred under vacuum condition and is degassed, the material is slowly injected into a nonporous die, then is demoulded through water-bath heating to obtain a wet blank, the wet blank is dried to the dried blank; and the ceramic composite material is obtained through sintering. According to the prepared inorganic fiber-enhanced ceramic composite material, compared with the ceramic without inorganic fiber, the bending strength at room temperature is increased by about 30%, the ceramic composite material is uniform and consistent, the time required by the method is short, an organic matter is not required for being added, rubber discharge is not required, and the ceramic composite material having complex shape is obtained.

Description

technical field [0001] The invention belongs to the technical field of inorganic non-metal, and more specifically relates to a method for rapidly preparing inorganic fiber reinforced ceramic matrix composite materials. Background technique [0002] High-performance ceramics have the advantages of high melting point, high hardness, high wear resistance, and oxidation resistance. They are widely used in home appliances, auto parts, construction, aerospace and other fields, and are an indispensable part of people's lives. However, its high brittleness and low impact resistance severely limit the further development and application of high-performance ceramics. With people's continuous exploration of material properties, it is found that inorganic fibers have excellent properties such as light weight, high strength, high modulus, and high temperature resistance. Existing technologies use methods such as hot die casting and casting to add inorganic fibers to ceramic materials, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/80C04B35/14C04B35/10C04B35/565
CPCC04B35/10C04B35/14C04B35/565C04B35/803C04B35/806C04B2235/3244C04B2235/3249C04B2235/349C04B2235/3843C04B2235/3873C04B2235/5224C04B2235/5236C04B2235/524C04B2235/5244C04B2235/5248C04B2235/6562C04B2235/6565C04B2235/96
Inventor 吴甲民肖欢陈安南陈敬炎刘梦月史玉升贺智勇
Owner HUAZHONG UNIV OF SCI & TECH
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