Silicon nitride nano-wire enhanced porous silicon nitride composite material and preparation method thereof

A technology of silicon nitride nano-composite materials, applied in the field of silicon nitride nanowire-reinforced porous silicon nitride composite materials and its preparation, can solve the problem of improving process safety, porosity and pore size distribution of difficult-to-porous silicon nitride ceramics Problems such as precise control and difficult large-scale and complex shape component forming

Active Publication Date: 2018-05-15
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Many of the above preparation methods are difficult to achieve precise control of the porosity and pore size distribution of porous silicon nitride ceramics, and the process conditions are relatively complex, and it is also difficult to realize the formation of large-scale components with complex properties (except for the organic precursor conversion method); while the organic Precursor conversion method needs to pre-design and synthesize the precursor, the cost is high, and the process safety needs to be further improved

Method used

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  • Silicon nitride nano-wire enhanced porous silicon nitride composite material and preparation method thereof
  • Silicon nitride nano-wire enhanced porous silicon nitride composite material and preparation method thereof
  • Silicon nitride nano-wire enhanced porous silicon nitride composite material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0038] (1) Add 7g of acrylamide, 0.3g of N'N-methylenebisacrylamide, 400μL of dispersant JA-281 (density 1.06g / mL) and 10g of pore-forming agent n-hexane into 60mL of deionized water, and make a mixture Solution, then 100g silicon nitride ceramic powder, 10g silicon monoxide, 10g ferrocene, 2g sintering aid (Al 2 o 3 ) mixed with the prepared mixed solution, and ball milled for 60 minutes to obtain a premixed slurry;

[0039] (2) Add tetramethylammonium hydroxide to the premixed slurry obtained after ball milling in step (1) until the pH value of the premixed slurry is 9.8, and continue ball milling for 12 hours to obtain a mixed slurry; then at a speed of 800r / min Stirring and vacuuming to remove the gas in the mixed slurry, and then adding 2.44mL initiator (aqueous solution of 2,2'-azo (2-methylpropyl ether) dihydrochloride with a mass fraction of 15%) And continue vacuuming for several minutes to obtain injection molding slurry;

[0040] (3) Inject the injection molding ...

Embodiment 2

[0044] (1) Add 7g of acrylamide, 0.3g of N'N-methylenebisacrylamide, 400μL of dispersant JA-281 (density 1.06g / mL) and 5g of pore-forming agent n-hexane into 60mL of deionized water, and make a mixture Solution, then 100g silicon nitride ceramic powder, 10g silicon monoxide, 10g ferrocene, 3g sintering aid (Al 2 o 3 ) mixed with the prepared mixed solution, and ball milled for 40 minutes to obtain a premixed slurry;

[0045] (2) Add tetramethylammonium hydroxide to the premixed slurry obtained after ball milling in step (1) until the pH value of the premixed slurry is 10.5, and continue ball milling for 12 hours to obtain a mixed slurry; Stir at a high speed and vacuumize to remove the gas in the mixed slurry, then add 2.46mL initiator (aqueous solution of 2,2'-azo(2-methylpropyl ether) dihydrochloride with a mass fraction of 15% ) and continue vacuuming for several minutes to obtain injection molding slurry;

[0046] (3) Inject the injection molding slurry into the mold, h...

Embodiment 3

[0049] (1) Add 7g of acrylamide, 0.3g of N'N-methylenebisacrylamide, 600μL of dispersant JA-281 and 3g of pore-forming agent n-hexane into 60mL of deionized water to form a mixed solution, and then nitriding 100g Silicon ceramic powder, 10g silicon monoxide, 10g ferrocene, 3g sintering aid (Al 2 o 3 ) mixed with the prepared mixed solution, and ball milled for 40 minutes to obtain a premixed slurry;

[0050] (2) Add tetramethylammonium hydroxide to the premixed slurry obtained after ball milling in step (1) until the pH value of the premixed slurry is 10.2, and continue ball milling for 12 hours to obtain a mixed slurry; then at a speed of 850r / min Under stirring and vacuuming to remove the gas in the mixed slurry, then add 2.46mL initiator (aqueous solution of 2,2'-azo (2-methylpropyl ether) dihydrochloride with a mass fraction of 15%) And continue vacuuming for several minutes to obtain injection molding slurry;

[0051] (3) Inject the injection molding slurry, heat-prese...

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Abstract

The invention discloses a silicon nitride nano-wire enhanced porous silicon nitride composite material and a preparation method thereof. The preparation method includes the steps: (1) mixing polymer monomers, cross-linking agents, dispersing agents, pore-forming agents and deionized water, mixing silicon nitride ceramic powder, silicon monoxide, nano-wire catalysts, sintering additives and mixed solution, and then performing ball-milling in advance; (2) adjusting a pH (potential of hydrogen) value of obtained premixed slurry to 9.5-11.5, performing ball milling and vacuum degassing, and mixingthe slurry and initiating agents; (3) performing injection molding by the aid of obtained injection molding slurry, and performing demolding, drying and rubber discharging; (4) sintering silicon nitride ceramic blanks in a protective atmosphere to obtain the composite material. The method has the advantages that the positions and the quantity of the nano-wires can be controlled, complicated shapes and molding of large components can be adapted, devices are simple, a process is safe and controllable and the like. Correspondingly, the prepared composite material is high in fracture toughness.

Description

technical field [0001] The invention relates to the technical field of preparation of porous ceramic composite materials, in particular to a silicon nitride nanowire-reinforced porous silicon nitride composite material and a preparation method thereof. Background technique [0002] Silicon nitride ceramics have excellent mechanical properties at room temperature and high temperature, good high temperature resistance and thermal shock resistance, and have good applications in the fields of high temperature heat resistant structural parts, cutting tools, high temperature resistant bearings, crucibles and wave-transmitting components. promising, but its inherent brittleness limits further applications. One-dimensional silicon nitride nanowire materials inherit the excellent properties of silicon nitride ceramics, such as high temperature resistance, high elastic modulus, high strength, and good thermal and chemical stability. Using it as a reinforcement is expected to improve t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/80C04B35/584C04B38/10C04B35/64
CPCC04B35/584C04B35/64C04B35/806C04B38/10C04B2235/3217C04B2235/3418C04B2235/6023C04B2235/6562C04B2235/96C04B38/0074C04B38/0067
Inventor 李端李斌于坤江高世涛杨雪金郑远义
Owner NAT UNIV OF DEFENSE TECH
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