Si3N4 ceramic material and preparation method thereof

A technology of ceramic material, -si3n492, applied in the field of preparation of silicon nitride ceramics, can solve the problems of reduced wear resistance of silicon nitride ceramics

Active Publication Date: 2021-05-28
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • 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

Method used

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  • Si3N4 ceramic material and preparation method thereof
  • Si3N4 ceramic material and preparation method thereof
  • Si3N4 ceramic material and preparation method thereof

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

[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 toughness o...

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

[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 1302.8±21....

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

[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 is 1...

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Abstract

The invention relates to a Si3N4 ceramic material and a preparation method thereof. The Si3N4 ceramic material comprises the following raw materials: 92-98 wt% of alpha-Si3N4 and 2-8 wt% of a sintering aid, and the sum of the mass percentages of the components is 100 wt%. The sintering aid is Al2O3, Y2O3, Fe2O3 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 and medium-speed 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 properties...

Claims

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Application Information

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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
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