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Preparation method of silicon nitride-based composite foamed ceramic

A technology based on composite foam and silicon nitride, which is applied in the field of foamed ceramic materials, can solve the problems of poor strength and achieve strong corrosion resistance, improved strength and high temperature resistance, and good high temperature conductivity

Pending Publication Date: 2019-10-22
陈波
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] Technical problem to be solved by the present invention: Aiming at the problem of poor strength of existing foam ceramic materials, a preparation method of silicon nitride-based composite foam ceramics is provided

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] In terms of parts by weight, weigh 30 parts of formaldehyde, 40 parts of phenol, 18 parts of ammonia water with a mass concentration of 10%, and 80 parts of deionized water, add formaldehyde to the deionized water, and stir at 120 r / min for 10 minutes at room temperature to obtain Formaldehyde solution, add phenol and ammonia water to the formaldehyde solution, stir and react at 240r / min in a water bath at 85°C for 10min, keep the temperature for 15min, and obtain the reactant, wash the reactant three times with deionized water, place in Stand for 1 hour under negative pressure of -0.06MPa, then dry in an oven at 60°C for 1 hour, and cool at room temperature to obtain phenolic resin; then weigh 20 parts of magnesium hydroxide and 40 parts of bicarbonate in parts by weight ammonium, 80 parts of deionized water, magnesium hydroxide was added to the deionized water, stirred at 1000r / min at room temperature for 1h to obtain milk of magnesia, ammonium bicarbonate was added to...

Embodiment 2

[0040] In terms of parts by weight, weigh 35 parts of formaldehyde, 50 parts of phenol, 21 parts of ammonia water with a mass concentration of 10%, and 90 parts of deionized water, add formaldehyde to the deionized water, and stir at 140 r / min for 11 minutes at room temperature to obtain Formaldehyde solution, add phenol and ammonia water to the formaldehyde solution, stir and react at 260r / min in a water bath at 90°C for 12min, keep the temperature for 25min, and obtain the reactant, wash the reactant 4 times with deionized water, place in Stand still under negative pressure of -0.04MPa for 1 hour, then dry in an oven at 70°C for 1 hour, and cool at room temperature to obtain phenolic resin; then weigh 25 parts of magnesium hydroxide and 50 parts of bicarbonate in parts by weight ammonium, 100 parts of deionized water, magnesium hydroxide was added into the deionized water, stirred at a speed of 1100r / min at room temperature for 1h to obtain milk of magnesia, ammonium bicarbon...

Embodiment 3

[0042] In terms of parts by weight, weigh 40 parts of formaldehyde, 60 parts of phenol, 24 parts of ammonia water with a mass concentration of 10%, and 100 parts of deionized water, add formaldehyde to the deionized water, and stir at a speed of 160 r / min for 12 minutes at room temperature to obtain Formaldehyde solution, add phenol and ammonia water to the formaldehyde solution, stir and react at 280r / min in a water bath at 95°C for 15min, keep the temperature for 30min, and obtain the reactant, wash the reactant 5 times with deionized water, place in Stand for 2 hours under negative pressure of -0.02MPa, then dry in an oven at 80°C for 2 hours, and cool at room temperature to obtain phenolic resin; then weigh 30 parts of magnesium hydroxide and 60 parts of bicarbonate in parts by weight Ammonium, 120 parts of deionized water, magnesium hydroxide was added to deionized water, stirred at 1200r / min at room temperature for 2h to obtain milk of magnesia, ammonium bicarbonate was a...

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Abstract

The invention relates to a preparation method of a silicon nitride-based composite foamed ceramic, and belongs to the technical field of foamed ceramic materials. The silicon nitride-based composite foamed ceramic is prepared form silicon nitride, light magnesium oxide and zirconium oxide. The silicon nitride has a high vapor pressure and a very low diffusion coefficient, and silicon atoms and nitrogen atoms are bonded by very strong covalent bonds, so the silicon nitride has a high strength, a high hardness and a good high temperature resistance, and the silicon nitride used as a raw materialcan effectively improve the strength and the high temperature resistance of the composite foamed ceramic; magnesium oxide belongs to a cubic system NaCl type structure, pure magnesium oxide has a melting point of 2800 DEG C, and has a good tensile strength, a good compressive strength and a good flexural strength, so the addition of the magnesium oxide can effectively improve the high temperatureresistance of the composite foamed ceramic; and the zirconium oxide has a large refractive index, a high melting point, a strong corrosion resistance, a good thermochemical stability, a good high-temperature conductivity, a good high-temperature strength and a good high-temperature toughness, so the addition of the zirconium oxide can effectively improve the comprehensive performances of the composite foamed ceramic.

Description

technical field [0001] The invention relates to a preparation method of silicon nitride-based composite foam ceramics, belonging to the technical field of foam ceramic materials. Background technique [0002] Foam ceramics is a new type of green ceramic material, which is composed of many pores arranged in various ways in space. It is a new generation of functional ceramics developed after ordinary porous ceramics and honeycomb porous ceramics. Due to its open three-dimensional network skeleton structure, it has a low bulk density (0.25~0.65g / m 3 ), high porosity (70~90%), widely distributed pore size (from nanometer to millimeter), developed specific surface area and other unique physical characteristics. Combined with these advantages of the ceramic matrix itself, it can endow the material with good temperature adaptability, oxidation resistance, corrosion resistance, low thermal expansion coefficient, good thermal stability, low thermal conductivity, high permeability, g...

Claims

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Application Information

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IPC IPC(8): C04B38/10C04B35/584C04B35/634
CPCC04B35/584C04B35/63476C04B38/10C04B2235/3206C04B2235/3244C04B38/0074
Inventor 陈波
Owner 陈波
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