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

Method for fast preparing translucent Li-alpha-SiAlON ceramic material

A ceramic material, translucent technology, applied in the field of translucent ceramic material preparation, can solve the problem of high sintering temperature, achieve the effect of low sintering temperature, excellent infrared light transmission performance, and simple process

Inactive Publication Date: 2010-10-06
WUHAN UNIV OF TECH
View PDF5 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Recently, our research group used spark plasma sintering to prepare a Mg-doped 2+ SiAlON ceramics [J.Am.Ceram.Soc., 90[5]1647-49(2007)], although it avoids infrared band absorption, the sintering temperature is still high
So far, the light transmission of α-SiAlON stabilized by Li has not been reported at home and 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
  • Method for fast preparing translucent Li-alpha-SiAlON ceramic material
  • Method for fast preparing translucent Li-alpha-SiAlON ceramic material
  • Method for fast preparing translucent Li-alpha-SiAlON ceramic material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] α-Si 3 N 4 , AlN, α-Al 2 o 3 , Li 2 CO 3 as raw material, according to Li m Si 12-m-n al m+n o n N 16-n The stoichiometric ratio of (m=1.0, n=1.5) selects α-Si with a total weight of 100g 3 N 4 , AlN, α-Al 2 o 3 , Li 2 CO 3 Raw materials, mixed in a plastic bottle, then with Si 3 N 4The ball is the ball milling medium, the ball-to-material ratio is 4:1, then add 500ml of absolute ethanol, and roll the ball mill for 24 hours to obtain the slurry; the slurry is evaporated to dryness in a rotary evaporator at 60°C, and then put into a vacuum drying oven to vacuum Dry for at least 24 hours, then take it out, grind for 20 minutes, and pass through a 100-mesh sieve to obtain the undersize; put the sieved undersize into a graphite mold with a diameter of 20mm, and then put it into a spark plasma sintering furnace, in N 2 Under the condition of gas protection and sintering pressure of 20Mpa, the heating rate was raised to 1000°C at a rate of 100°C / min, kept for...

Embodiment 2

[0034] α-Si 3 N 4 , AlN, α-Al 2 o 3 , Li 2 CO 3 as raw material, according to Li m Si 12-m-n Al m+n o n N 16-n The stoichiometric ratio of (m=1.2, n=1.2) selects α-Si with a total weight of 100g 3 N 4 , AlN, α-Al 2 o 3 , Li 2 CO 3 Raw materials, mixed in a plastic bottle, then with Si 3 N 4 The ball is the ball milling medium, the ball-to-material ratio is 4:1, then add 500ml of absolute ethanol, and roll the ball mill for 24 hours to obtain the slurry; the slurry is evaporated to dryness in a rotary evaporator at 60°C, and then placed in a vacuum drying oven Vacuum dry for at least 24 hours, take it out, grind for 20 minutes, and pass through a 100-mesh sieve to obtain the undersize; put the undersize into a graphite mold with a diameter of 20 mm, 2 Under the condition of gas protection and sintering pressure of 20Mpa, the heating rate was raised to 1000°C at a rate of 100°C / min, kept for 1min, and then raised to 1600°C at a rate of 100°C / min, sintered for 5m...

Embodiment 3

[0037] α-Si 3 N 4 , AlN, α-Al 2 o 3 , Li 2 CO 3 as raw material, according to Li m Si 12-m-n Al m+n o n N 16-n The stoichiometric ratio of (m=0.5, n=0.9) selects α-Si with a total weight of 100g 3 N 4 , AlN, α-Al 2 o 3 , Li 2 CO 3 Raw material, put into plastic bottle and mix, take Si 3 N 4 The ball is the ball milling medium, the ball-to-material ratio is 4:1, then add 500ml of absolute ethanol, and roll the ball mill for 24 hours to obtain the slurry; the slurry is evaporated to dryness in a rotary evaporator at 50°C, and then put into a vacuum drying oven to vacuum Dry for at least 24 hours, take it out, grind for 20 minutes, and pass through a 100-mesh sieve to get the undersize, put the undersize into a graphite mold with a diameter of 20mm, and then put it into a spark plasma sintering furnace. 2 Under the conditions of gas protection and sintering pressure of 20Mpa, the temperature was raised to 950°C at a rate of 100°C / min, kept for 1min, then raised t...

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 a method for fast preparing a translucent Li-alpha-SiAlON ceramic material, comprising the following steps of: selecting and mixing materials of alpha-Si3N4, AlN, alpha-Al2O3 and Li2CO3 according to a general formula of LimSil2-m-nAlm+nOnN16-n, wherein m is larger than 0.4 and less than 2.0, and n is larger than 0.8 and less than 2.0; carrying out ball milling and drying, grinding and screening with a 200-mesh sieve; putting the processed mixture in a discharge plasma sintering furnace at the sintering pressure not less than 20MPa and under the protection of N2 gas, raising the temperature to 950-1050 DEG C, preserving the temperature for 1-3 minutes, then raising the temperature to 1600-1850 DEG C for sintering for 0-20 minutes, and cooling along with the furnace; cutting, grinding and polishing till a mirror surface is formed. The discharge plasma sintering method has simple process, fast temperature raising, low sintering temperature, short time and low energy consumption. The prepared translucent Li-alfa-SiAlON ceramic material has excellent infrared transparency.

Description

technical field [0001] The invention relates to a rapid preparation method of a translucent Li-α-SiAlON ceramic material and a product thereof, belonging to the field of translucent ceramic material preparation. Background technique [0002] Since Dr. Coble invented translucent alumina ceramics (US3026210) in 1962, people have prepared a series of oxide transparent or translucent ceramic materials, such as MgO, Y 2 o 3 (CN1562886), YAG (CN1562880), etc., and have been widely used in lighting technology, optics, high temperature technology, radio technology and other fields. However, with the development of science and technology, due to the poor mechanical properties, thermal shock resistance and low thermal conductivity of oxide transparent ceramic materials, it is increasingly difficult to meet the needs of practical applications. [0003] In recent years, nitride ceramic materials have attracted attention due to their excellent comprehensive properties, and translucent ...

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 王皓杨章富王为民傅正义王玉成张清杰
Owner WUHAN UNIV OF 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