High-hardness high-wear-resistance silicon nitride ceramic and preparation method and application thereof

A technology of silicon nitride ceramics and high wear resistance, which is applied in the field of ceramic cutting tools, can solve the problems that the application of high hardness and high wear resistance silicon nitride ceramic materials has not been reported, etc., to achieve increased hardness, small grain size, and cost savings Effect

Inactive Publication Date: 2019-09-10
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the preparation of high hardness and high wear resistance silicon nitride ceramic materials by this technology and its application in the field of cutting tools have not been reported.

Method used

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  • High-hardness high-wear-resistance silicon nitride ceramic and preparation method and application thereof
  • High-hardness high-wear-resistance silicon nitride ceramic and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1. Preparation:

[0029] (1) with Si 3 N 4 Powder is (particle size2 o 3 Powder (99.9% pure), Yb 2 o 3 (99.99% pure), according to Si 3 N 4 :Al 2 o3 : Yb 2 o 3 The volume ratio is 91:4.5:4.5 for batching, with ethanol as solvent and Si 3 N 4 The ball is the ball milling medium, and after mixing in the planetary ball mill for 8 hours, a uniformly mixed Si 3 N 4 -Al 2 o 3 -Yb 2 o 3 Powder.

[0030] (2) Si 3 N 4 -Al 2 o 3 -Re 2 o 3 Put the mixed powder into the graphite mold of spark plasma sintering furnace, raise the temperature to 800°C at a rate of 200°C / min under a vacuum of less than 1mbar, and then fill it with 1atm nitrogen within 1min. After the inflation is completed, within 2min Pressurize axially to 35MPa, and raise the temperature to 1680°C at a rate of 100°C / min at the same time as the inflation starts, keep the temperature for 5 minutes, then cool down to 800°C at a cooling rate of 120°C / min, release the pressure axially, and follow th...

Embodiment 2

[0037] 1. Preparation:

[0038] (1) with Si 3 N 4 Powder is (particle size2 o 3 Powder (99.9% pure), Yb 2 o 3 (99.99% pure), according to Si 3 N 4 :Al 2 o 3 : Yb 2 o 3 The volume ratio is 94:4:2 for batching, with ethanol as solvent and Si 3 N 4 The ball is the ball milling medium, and after mixing in the planetary ball mill for 8 hours, a uniformly mixed Si 3 N 4 -Al 2 o 3 -Yb 2 o 3 Powder.

[0039] (2) Si 3 N 4 -Al 2 o 3 -Re 2 o 3 Put the mixed powder into the graphite mold of spark plasma sintering furnace, raise the temperature to 800°C at a rate of 200°C / min under a vacuum of less than 1mbar, and then fill it with 1atm nitrogen within 1min. After the inflation is completed, within 2min Pressurize axially to 50MPa, and raise the temperature to 1600°C at a rate of 100°C / min at the same time as the inflation starts, keep the temperature for 1min, then cool down to 800°C at a cooling rate of 120°C / min, release the pressure axially, and follow the furna...

Embodiment 3

[0042] 1. Preparation:

[0043] (1) with Si 3 N 4 Powder is (particle size2 o 3 Powder (99.9% pure), Yb 2 o 3 (99.99% pure), according to Si 3 N 4 :Al 2 o 3 : Yb 2 o 3 The volume ratio is 90:3:7 for batching, with ethanol as solvent and Si 3 N 4 The ball is the ball milling medium, and after mixing in the planetary ball mill for 8 hours, a uniformly mixed Si 3 N 4 -Al 2 o 3 -Yb 2 o 3 Powder.

[0044] (2) Si 3 N 4 -Al 2 o 3 -Re 2 o 3 Put the mixed powder into the graphite mold of spark plasma sintering furnace, raise the temperature to 800°C at a rate of 200°C / min under a vacuum of less than 1mbar, and then fill it with 1atm nitrogen within 1min. After the inflation is completed, within 2min Pressurize axially to 30MPa, and raise the temperature to 1780°C at a rate of 100°C / min at the same time as the inflation starts, keep the temperature for 15 minutes, then cool down to 800°C at a cooling rate of 120°C / min, release the pressure axially, and follow the...

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Abstract

The invention belongs to the field of ceramic cutting tools, and discloses high-hardness high-wear-resistance silicon nitride ceramic and a preparation method and application thereof. The silicon nitride ceramic is prepared by mixing Si3N4 powder and a sintering aid that is Al2O3-Re2O3; bal-milling and mixing the mixture by adopting ethanol as a solvent and adopting Si3N4 balls as a ball milling medium; drying to obtain mixture powder of Si3N4-Al2O3-Re2O3; heating the mixture powder in vacuum at a speed I to 700-900 DEG C; then axially pressurizing the powder to 25-50 MPa under nitrogen protection; heating the powder at a speed II to 1600-1800 DEG C and maintaining the temperature; and performing spark plasma sintering. The ceramic has good wear resistance and cutting performance and can be applied to the field of cutting tools.

Description

technical field [0001] The invention belongs to the technical field of ceramic cutting tools, and more specifically relates to a high-hardness and high-wear-resistance silicon nitride (Si 3 N 4 ) Ceramics and their preparation methods and applications. Background technique [0002] Si 3 N 4 Ceramic is a liquid phase sintered material, usually accompanied by α→β phase transition during sintering and densification process, α-Si 3 N 4 It is a stable crystal form at low temperature, with equiaxed crystal morphology, high hardness and good wear resistance; β-Si 3 N 4 It is a high-temperature stable crystal form with long columnar or needle-like crystal morphology. Silicon nitride ceramics with this microstructure usually have high strength and toughness, but low hardness. Commonly used Si 3 N 4 The components are basically β-Si 3 N 4 , has excellent mechanical properties and high temperature stability, but its hardness is often low, so its application range is also lim...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/596C04B35/622C04B35/64
CPCC04B35/587C04B35/622C04B35/64C04B2235/3217C04B2235/3224C04B2235/3225C04B2235/3227C04B2235/3229C04B2235/5445C04B2235/5436C04B2235/6562C04B2235/6565C04B2235/6567C04B2235/658C04B2235/6581C04B2235/666C04B2235/96
Inventor 郭伟明谭大旺陈志伟林华泰
Owner GUANGDONG UNIV OF TECH
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