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

Method for rapid high-temperature solid sintering of alumina ceramic

A technology of sintering alumina and high-temperature solid phase, which is applied in the field of ceramic sintering, can solve the problems of not achieving material densification, and achieve the effects of short sintering time, simple process and high sintering temperature

Inactive Publication Date: 2017-08-11
WUHAN UNIV OF TECH
View PDF0 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the sample prepared by this pressureless rapid sintering technology did not realize the densification of the material in the end, because there are many closed pores in the product, and it takes more time to eliminate them

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A kind of preparation method of ultrafast pressureless preparation alumina ceramics, it comprises the following steps:

[0021] (1) Powder treatment: put the alumina powder raw material used in the experiment into a drying oven to dry for 24 hours.

[0022] (2) Prepare alumina rough billet: weigh 1.5 g of alumina powder after drying in (1), press it into a disc-shaped rough billet with a diameter of 1.5 cm with a tablet press, the pressure is 8 MPa, and the holding time is 2 min; Place the pressed disc-shaped rough billet in a cold isostatic press, and carry out cold isostatic pressing to the sample under a pressure of 200 MPa, and hold the pressure for 5 minutes to make it have a higher initial density (the first billet is compact Degree of about 60%), in order to facilitate the sintering of subsequent products.

[0023] (3) Sintering: put the treated alumina blank in (2) into the TiB in the rapid heating device 2 In the sintering heating tank, start to heat up, and ...

Embodiment 2

[0029] A kind of preparation method of ultrafast pressureless preparation alumina ceramics, it comprises the following steps:

[0030] (1) Powder treatment: put the alumina powder raw material used in the experiment into a drying oven to dry for 24 hours.

[0031] (2) Preparation of alumina rough billet: take 1.5 g of the dried alumina powder in 1), press it into a disc-shaped rough billet with a diameter of 1.5 cm with a tablet press, the pressure is 8 MPa, and the holding time is 2 min; The pressed disc-shaped rough blank is placed in a cold isostatic press, and the sample is subjected to cold isostatic pressing under a pressure of 200 MPa, and the holding time is 5 minutes to make it have a higher initial density, which is beneficial to subsequent products. of sintering.

[0032] (3) Sintering: Wrap the rough alumina billet processed in (2) with graphite paper, put it into the graphite mold in the rapid heating device, and start heating up. The heating rate is above 500-60...

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 belongs to the technical field of ceramic sintering, and concretely relates to a method for rapid high-temperature solid sintering of alumina ceramic. The method comprises the following steps: drying alumina powder, and processing the dried alumina powder to form a disc-like green body; rapidly rising the temperature to a preset sintering temperature under a non-pressure condition according to a heating rate of 500-600 DEG C, carrying out short heat insulation, and naturally cooling the sintered green body to obtain the highly compact alumina ceramic, wherein the preset sintering temperature is higher than a convectional sintering temperature of 200-300 DEG C and is lower than the melting point of the alumina ceramic. The method realizes the obtaining of the alumina ceramic through the rapid high-temperature solid sintering under the non-pressure condition; and compared with traditional sintering methods, the method for rapid high-temperature solid sintering of alumina ceramic has the advantages of fast heating rate, high sintering temperature, short sintering time and short production period.

Description

technical field [0001] The invention belongs to the technical field of ceramic sintering, and in particular relates to a method for rapid high-temperature solid-phase sintering of alumina ceramics. Background technique [0002] Alumina ceramics are one of the ceramic materials with the widest application, widest use and largest output among oxide ceramics. It has high mechanical strength, high resistivity, good electrical insulation performance, high hardness and melting point, good corrosion resistance and chemical stability. It has good properties such as good optical properties and ionic conductivity under certain conditions, and has broad application prospects in machinery, electronics, electrical engineering, chemical engineering, medicine, construction and other fields. [0003] Alumina sintering is a long process. The traditional pressureless sintering process requires high sintering temperature and long holding time, so there are serious problems of time and energy c...

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 Applications(China)
IPC IPC(8): C04B35/10C04B35/622
CPCC04B35/10C04B35/622C04B2235/6562C04B2235/6567C04B2235/77C04B2235/94C04B2235/95
Inventor 张金咏汪信志
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