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

a kind of si 3 no 4 Ceramic material and its preparation method

A ceramic material, -si3n492 technology, applied in the field of silicon nitride ceramics preparation, can solve the problems such as the reduction of wear resistance of silicon nitride ceramics, and achieve the effects of eliminating residual pores, excellent comprehensive performance and improving strength

Active Publication Date: 2022-05-10
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a large gap between the mechanical properties and wear resistance of the intergranular phase formed by sintering aids and silicon nitride, and the greater the amount added, the more obvious the reduction in the wear resistance of silicon nitride ceramics.

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 kind of si <sub>3</sub> no <sub>4</sub> Ceramic material and its preparation method
  • a kind of si <sub>3</sub> no <sub>4</sub> Ceramic material and its preparation method
  • a kind of si <sub>3</sub> no <sub>4</sub> Ceramic material and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A kind of Si 3 N 4 Ceramic material and preparation method thereof, comprising the following steps:

[0039] S1: Weigh 95g Si 3 N 4 , 1.73g Al 2 o 3 , 1.27g Y 2 o 3 , 1.00g Fe 2 o 3 A total of 100g and 1.00g AlN;

[0040] S2: The mixed powder in step S1 is configured into a slurry with a certain solid content, and the planetary ball mill is 3h, and the rotating speed is 400rpm;

[0041] S3: Grinding after drying the slurry obtained in step S2, passing through a 400-mesh sieve and preforming under a pressure of 20 MPa by dry pressing, and then forming by cold isostatic pressing at 300 MPa;

[0042] S4: the ceramic biscuit obtained in step S3 is put into a BN mould, and placed in a gas pressure sintering furnace, filled with N 2 As a protective gas, sinter at 1750°C and 2MPa pressure for 240 minutes, then perform hot isostatic pressing at 1700°C for 2.5 hours at 200MPa, the relative density is 99.4%, and the bending strength is 1305.7± 15.2MPa, fracture toughn...

Embodiment 2

[0044] A kind of Si 3 N 4 Ceramic material and preparation method thereof, comprising the following steps:

[0045] S1: Weigh 95g Si 3 N 4 , 0.6g Al 2 o 3 , 2.65g Y 2 o 3 , 0.75g Fe 2 o 3 A total of 100g and 1.00g AlN;

[0046] S2: The mixed powder in step S1 is configured into a slurry with a certain solid content, and the planetary ball mill is 3h, and the rotating speed is 400rpm;

[0047] S3: Grinding after drying the slurry obtained in step S2, passing through a 400-mesh sieve and preforming under a pressure of 20 MPa by dry pressing, and then forming by cold isostatic pressing at 300 MPa;

[0048] S4: the ceramic biscuit obtained in step S3 is put into a BN mould, and placed in a gas pressure sintering furnace, filled with N 2 As a protective gas, sinter at 1750°C and 2MPa pressure for 240 minutes, then carry out hot isostatic pressing at 1700°C, holding time for 1h, and pressure 200MPa, that is, the relative density is 99.3%, and the bending strength is 1302....

Embodiment 3

[0050] A kind of Si 3 N 4 Ceramic material and preparation method thereof, comprising the following steps:

[0051] S1: Weigh 95g Si 3 N 4 , 2.01g Al 2 o 3 , 1.49g Y 2 o 3 , 0.75g Fe 2 o 3 And 0.75g AlN a total of 100g;

[0052] S2: The mixed powder in step S1 is configured into a slurry with a certain solid content, and the planetary ball mill is 3h, and the rotating speed is 400rpm;

[0053] S3: Grinding after drying the slurry obtained in step S2, passing through a 400-mesh sieve and preforming under a pressure of 20 MPa by dry pressing, and then forming by cold isostatic pressing at 300 MPa;

[0054] S4: the ceramic biscuit obtained in step S3 is put into a BN mould, and placed in a gas pressure sintering furnace, filled with N 2 As a protective gas, sinter at 1750°C and 2MPa pressure for 240 minutes, and then perform hot isostatic pressing at 1650°C for a holding time of 0.5h and an air pressure of 150MPa. The relative density is 99.6%, and the bending strength...

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
flexural strengthaaaaaaaaaa
Vickers hardnessaaaaaaaaaa
flexural strengthaaaaaaaaaa
Login to View More

Abstract

The present invention relates to a Si 3 N 4 Ceramic material and preparation method thereof, the Si 3 N 4 The raw material composition of ceramic materials includes: α‑Si 3 N 4 Al 2 o 3 , Y 2 o 3 , Fe 2 o 3 and AlN.

Description

technical field [0001] The invention relates to a low sintering temperature, low additive concentration, high strength Si 3 N 4 A ceramic material and a preparation method thereof belong to the field of preparation of silicon nitride ceramics. Background technique [0002] Silicon nitride ceramics have the advantages of low density, good mechanical properties, high temperature resistance, wear resistance, corrosion resistance, electrical insulation and non-magnetic conductivity, etc., and can be used as bearing balls to completely cover the application fields of precision, medium-speed and above all-steel bearing balls, And it can be used in working environments where traditional metal balls are not capable of such as high speed, high and low temperature, large temperature difference, vacuum, insulation, non-magnetic conduction and instantaneous non-lubrication. However, compared with imported balls, there is still a lot of room for improvement in the friction and wear pro...

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): C04B35/584C04B35/64C04B35/645
CPCC04B35/584C04B35/6455C04B35/64C04B2235/3878C04B2235/3217C04B2235/3225C04B2235/3272C04B2235/3865
Inventor 曾宇平梁汉琴左开慧夏咏锋姚冬旭尹金伟
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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