Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A method for preparing high-temperature non-oxide eutectic ultrafine powder by thermal polymerization reaction

A non-oxide, ultra-fine powder technology, which is applied in the field of high-temperature non-oxide eutectic ultra-fine powder, can solve the problems of unsuitable industrial preparation, complicated processing technology, and high-temperature strength reduction, etc., and achieves wide application range and simple preparation process , The effect of small high temperature creep

Active Publication Date: 2020-07-21
HAINAN VOCATIONAL COLLEGE OF SCI & TECH
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The preparation process of non-oxide ceramics mainly includes reaction sintering, hot pressing sintering, and hot isostatic pressing; reaction sintering prepares ceramic bodies, there is almost no shrinkage during sintering, and complex shapes can be obtained, but its density is low, strength is low, and corrosion resistance is poor , can only prepare ceramic bodies used in ordinary environments; hot pressing sintering can make ceramic bodies densified with less additives, with good strength and corrosion resistance, but only simple shapes can be produced, and sintering additives Reduce the high temperature strength; hot isostatic pressing combines the advantages of reaction sintering and hot pressing sintering, but because the equipment used in this process is expensive, and the requirements for the green body before hot isostatic pressing are strict, the pretreatment process of the green body to be fired is complicated , not suitable for industrial preparation

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A method for preparing high-temperature non-oxide eutectic ultrafine powder by thermal polymerization reaction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A method for preparing high-temperature non-oxide eutectic ultrafine powder by thermal polymerization:

[0020] 1. Preparation of silicon nitride powder: silicon nitride and MgSiN 2 Put it into a silicon nitride ball mill tank with a mass ratio of 100:0.5, the ball-to-material ratio is 15:1, and the filling amount is 30%, and then add an ethanol solution with a solid-liquid ratio of 100g:1ml, at a rate of 300rpm / min After ball milling at high speed for 25 minutes, filter, put the filter residue into the ball mill tank, add the same volume of ethanol solution as above, repeat the ball mill 3 times, filter and dry, put the filter residue into the graphite mold, under the mechanical pressure of 25MPa, nitrogen pressure of 7MPa , Sintering at a temperature of 1875°C and a holding time of 45 hours. After sintering, the temperature is lowered to 1500±5°C at a cooling rate of 15°C per minute. After holding for 5 hours, the temperature is naturally cooled to room temperature, a...

Embodiment 2

[0024] A method for preparing high-temperature non-oxide eutectic ultrafine powder by thermal polymerization:

[0025] 1. Preparation of silicon nitride powder: silicon nitride and MgSiN 2 Put it into a silicon nitride ball mill tank with a mass ratio of 100:3, the ball-to-material ratio is 25:1, and the filling amount is 20%, then add an ethanol solution with a solid-to-liquid ratio of 100g: 1ml, and use 200rpm / min After ball milling at high speed for 45 minutes, filter, put the filter residue into the ball mill tank, add the same volume of ethanol solution as above, repeat the ball mill 4 times, filter and dry, put the filter residue into the graphite mold, under the mechanical pressure of 8MPa, nitrogen pressure of 3MPa , Sintering at a temperature of 2245°C and a holding time of 30 hours. After sintering, the temperature is lowered to 1500±5°C at a cooling rate of 20°C per minute. After holding for 7 hours, the temperature is naturally cooled to room temperature, and ball ...

Embodiment 3

[0029]A method for preparing high-temperature non-oxide eutectic ultrafine powder by thermal polymerization:

[0030] 1. Preparation of silicon nitride powder: silicon nitride and MgSiN 2 Put it into a silicon nitride ball mill tank with a mass ratio of 100:2, the ball-to-material ratio is 20:1, and the filling amount is 25%. After ball milling at high speed for 30 minutes, filter, put the filter residue into the ball mill tank, add the same volume of ethanol solution as above, repeat the ball mill 3 times, filter and dry, put the filter residue into the graphite mold, under the mechanical pressure of 15MPa, nitrogen pressure of 5MPa , Sintering at a temperature of 2000°C and a holding time of 35 hours. After sintering, the temperature is lowered to 1500±5°C at a rate of 18°C ​​per minute. After holding for 6 hours, the temperature is naturally cooled to room temperature, and the ball mill is pulverized until the particle size is less than 10 microns. Afterwards, silicon nitr...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle diameteraaaaaaaaaa
Login to View More

Abstract

The invention discloses a method for preparing high-temperature non-oxide eutectic superfine powder by a heat polymerization reaction. According to the method disclosed by the invention, compound powder is prepared by adopting heat polymerization and the compound powder reacts with silicon nitride to prepare eutectic ceramic powder; the disadvantages that the density of a compound ceramic material sintered by the reaction is low, the hot pressing sintering temperature strength is poor and the like are solved; the density and strength of a product are effectively improved; a special temperature control curve is adopted and the prepared eutectic ceramic powder has the advantages of small thermal expansion coefficient, good thermal shock resistance property, small high-temperature creep and the like and the application range of the product is relatively wide; and a preparation process is simple and the product has stable performances and is suitable for industrial production.

Description

technical field [0001] The invention relates to a preparation technology of a non-oxide ceramic material, in particular to a method for preparing a high-temperature non-oxide eutectic ultrafine powder by thermal polymerization. Background technique [0002] Non-oxide ceramic materials have made great progress in recent decades, which has greatly promoted the progress of modern high-tech, played a huge role in promoting the progress of human society, and made an indelible contribution to economic and national defense construction. Contribution, the chemical composition of non-oxide ceramics does not contain oxygen. At present, non-oxide ceramics mainly include carbide ceramics and nitride ceramics, among which carbide ceramics mainly include silicon carbide ceramics, titanium carbide ceramics, boron carbide ceramics, and tungsten carbide ceramics. , zirconium carbide ceramics, vanadium carbide ceramics, chromium carbide ceramics, etc.; nitride ceramics mainly include boron ni...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/584C04B35/626
CPCC04B35/584C04B35/6261C04B2235/404C04B2235/48C04B2235/483C04B2235/486C04B2235/5436
Inventor 龚贵华徐桂梅
Owner HAINAN VOCATIONAL COLLEGE OF SCI & TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com