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

Alpha-SiAlON/BN composite ceramic material and preparation method thereof

A technology of composite ceramics and raw materials, applied in the field of composite ceramic materials, to achieve high-temperature mechanical properties, simple preparation process, and good thermal shock resistance

Inactive Publication Date: 2011-06-15
DALIAN MARITIME UNIVERSITY
View PDF3 Cites 18 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are no patent reports on α-SiAlON / BN composite ceramics abroad

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
  • Alpha-SiAlON/BN composite ceramic material and preparation method thereof
  • Alpha-SiAlON/BN composite ceramic material and preparation method thereof
  • Alpha-SiAlON/BN composite ceramic material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] It is doped with yttrium oxide with a purity higher than 99.9%, and uses α-phase silicon nitride, aluminum nitride and aluminum oxide powder as raw materials. Select the dosing point in the α-SiAlON single-phase plane, according to the molecular formula Y m / 3 Si 12-(m+n) Al m+n o n N 16-n Calculate the mass percentage of silicon nitride, aluminum nitride, aluminum oxide and yttrium oxide in the raw material powder when 1.0<m<1.5, n=1.4, and then weigh hexagonal boron nitride according to 20% of the total mass of the above powder Powder, weighed powder in a polytetrafluoroethylene tank, using absolute ethanol as a dispersion medium, silicon nitride balls as a ball milling medium, and ball milling for 24 hours. After the mixed slurry is dried, it is put into a graphite mold covered with graphite paper, and then the mold filled with powder is placed in a hot-press furnace. In order to prevent the powder from sticking to the graphite mold, graphite paper is used to sep...

Embodiment 2

[0030] Compared with Example 1, the molecular formula of its Y-α-SiAlON ceramics is Y m / 3 Si 12-(m+n) Al m+n o n N 16-n , where m=1.2, 0.8<n<1.5, the dosage of hexagonal boron nitride is 5% of the total mass of Y-α-SiAlON powder, and the specific preparation method is the same as in Example 1.

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

No PUM Login to View More

Abstract

The invention relates to an alpha-SiAlON / BN composite ceramic material and a preparation method thereof. The preparation method comprises the following steps: adopting the hot pressing sintering technology and alpha-silicon nitride powder, aluminum nitride powder, alumina powder and yttrium oxide powder as raw materials to design components according to the general formula of alpha-SiAlON, namelyYm / 3Si12-(m+n)Alm+nOnN16-n, wherein m and n are the parameters of the selected components; and adding hexagonal boron nitride, performing ball milling to the raw powder, drying, granulating, filling in a graphite mould, heating in a heating rate of 10-40 DEG C / min under dynamic nitrogen atmosphere to 1800-1950 DEG C, and sintering for 30-120min under 15-35MPa. The alpha-SiAlON / BN composite ceramic prepared by the method of the invention is characterized by high temperature resistance and high high-temperature strength.

Description

technical field [0001] The invention belongs to the technical field of composite ceramic materials, and specifically relates to a preparation method of α-SiAlON / BN composite ceramic materials. Background technique [0002] α-SiAlON (α') is suitable for use in harsh environments due to its good thermal stability, chemical stability and excellent mechanical properties, and is a very excellent structural engineering material. Compared with silicon nitride, α-SiAlON has the advantage of being easy to sinter, and after sintering, the liquid phase can be solid-dissolved into the α-SiAlON lattice, thereby reducing the grain boundary glass phase and improving high-temperature performance. Hexagonal boron nitride has good chemical inertness, self-lubrication, small dielectric constant, excellent thermal shock resistance and machinability, especially its lamellar lamellar crystal structure and comparative The large anisotropic thermal expansion characteristics make it more and more w...

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
IPC IPC(8): C04B35/599C04B35/622
Inventor 单英春徐久军王光
Owner DALIAN MARITIME UNIVERSITY
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