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Si3N4-Si2N2O double-phase ceramic material and preparation method thereof

A technology of complex phase ceramics and preparation process, applied in the field of ceramic materials, can solve problems such as inability to achieve, and achieve the effect of simplifying operation and saving energy consumption

Inactive Publication Date: 2013-04-17
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The object of the invention is to provide a Si with adjustable two-phase ratio 3 N 4 -Si 2 N 2 O composite ceramic material and preparation method thereof, to solve the existing technology can not realize Si 3 N 4 -Si 2 N 2 It is difficult to adjust the phase composition in O composite ceramic materials to meet the requirements of preparing thermal protection ceramic materials with certain strength, toughness and oxidation resistance.

Method used

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  • Si3N4-Si2N2O double-phase ceramic material and preparation method thereof
  • Si3N4-Si2N2O double-phase ceramic material and preparation method thereof

Examples

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Embodiment 1

[0039] First dissolve 0.675g sucrose into 5g deionized water, stir to dissolve the sucrose completely, then add 0.047g sulfuric acid, stir to mix evenly, and obtain solution A; then slowly add 1.0g SBA-15 to solution A, stir to mix evenly , to obtain a paste A; put the paste A in an oven, dry at 100°C for 6 hours, let the water fully evaporate, then increase the temperature of the oven to 160°C, and pre-carbonize for 6 hours to obtain a pre-carbonized product A.

[0040] Add 0.675g sucrose, 0.094g sulfuric acid and 5g deionized water to the above-mentioned pre-carbonized product A again, stir to mix evenly, and obtain paste B; place paste B in an oven, dry at 100°C for 6h, let The water is fully evaporated, and then the temperature of the oven is raised to 160°C for pre-carbonization for 6 hours to obtain the pre-carbonized product B.

[0041] The pre-carburized product B was placed in a tube furnace, and calcined at 800°C for 4 hours under a protective atmosphere with a nitro...

Embodiment 2

[0048]Dissolve 0.338g of sucrose into 5g of deionized water, stir to dissolve the sucrose completely, then add 0.047g of sulfuric acid, stir to mix evenly to obtain solution A; then slowly add 1.0g SBA-15 to solution A, stir to mix evenly , to obtain a paste A; put the paste A in an oven, dry at 100°C for 6 hours, let the water fully evaporate, then increase the temperature of the oven to 160°C, and pre-carbonize for 6 hours to obtain a pre-carbonized product A.

[0049] Add 0.337g of sucrose, 0.047g of sulfuric acid and 5g of deionized water to the above-mentioned pre-carbonized product A again, stir to mix evenly, and obtain paste B; place paste B in an oven, dry at 100°C for 6h, let The water is fully evaporated, and then the temperature of the oven is raised to 160°C for pre-carbonization for 6 hours to obtain the pre-carbonized product B.

[0050] The pre-carburized product B was placed in a tube furnace, and calcined at 800°C for 4 hours under a protective atmosphere wit...

Embodiment 3

[0057] First dissolve 0.473g sucrose into 5g deionized water, stir to dissolve the sucrose completely, then add 0.047g sulfuric acid, stir to mix evenly, and obtain solution A; then slowly add 1.0g SBA-15 to solution A, stir to mix evenly , to obtain a paste A; put the paste A in an oven, dry at 100°C for 6 hours, let the water fully evaporate, then increase the temperature of the oven to 160°C, and pre-carbonize for 6 hours to obtain a pre-carbonized product A.

[0058] Add 0.472g sucrose, 0.047g sulfuric acid and 5g deionized water to the above-mentioned pre-carbonized product A again, stir to mix evenly, and obtain paste B; place paste B in an oven, dry at 100°C for 6h, let The water is fully evaporated, and then the temperature of the oven is raised to 160°C for pre-carbonization for 6 hours to obtain the pre-carbonized product B.

[0059] The pre-carburized product B was placed in a tube furnace, and calcined at 800°C for 4 hours under a protective atmosphere with a nitro...

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Abstract

The invention discloses a Si3N4-Si2N2O double-phase ceramic material, wherein proportion of the two phases is adjustable, and a preparation method for making the same. The material comprises the two phases, namely, Si3N4 and Si2N2O, and the weight percentage of the two phases is adjustable in a range of from 86.64:13.36-67.66:32.34. The preparation method for the material comprises the following steps: using ordered mesoporous silica and organic micromolecular carbon source as raw materials for nanometer casting so as to obtain a mesoporous carbon / silica compound; carrying out a carbonthermalreduction nitridation reaction on the mesoporous carbon / silica compound so as to prepare Si3N4-Si2N2O composite powder containing carbon; calcining the prepared Si3N4-Si2N2O composite powder containing carbon in air so as to remove residual carbon, and carrying out cooling. The Si3N4-Si2N2O double-phase ceramic material prepared in the invention can meet the requirements for preparing heat-resistant ceramic materials with properties of strength, toughness and antioxidation, and is widely applicable to the fields of spaceflight, metallurgy, chemicals, etc.

Description

technical field [0001] The present invention relates to a Si 3 N 4 -Si 2 N 2 O composite ceramic material and preparation method thereof, specifically, relate to a kind of Si with high-strength and high-toughness anti-oxidation ceramics, two-phase ratio adjustable 3 N 4 -Si 2 N 2 An O composite ceramic material and a preparation method thereof belong to the technical field of ceramic materials. Background technique [0002] Si 3 N 4 As an excellent structural material, it has been greatly developed in the past few decades. Due to its excellent high-temperature mechanical stability, corrosion resistance, and good thermal shock resistance, it is widely used in high-performance engines, ceramic knives, and some structural components. Except single-phase Si 3 N 4 material applications, Si 3 N 4 Matrix composite materials have also been promoted in many fields such as modern metallurgy and chemical industry, especially as high-temperature corrosion-resistant and hea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/584C04B35/622
Inventor 刘茜周遥周虎钟红梅
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI