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Method for preparing silicon nitride-tungsten carbide titanium nano-composite ceramic cutting tool material

A tungsten carbide and titanium nanocomposite technology, applied in the field of ceramic materials, can solve the problems of limited hardness and toughness, and low hardness.

Inactive Publication Date: 2014-04-23
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Adding SiC particles to the silicon nitride matrix material can significantly improve its flexural strength, but the hardness and toughness are still very limited (Hirano T, Niihara K. Microstructure and mechanical properties of Si 3 N 4 / SiC composites[J].Mater Lett,1995,22(5):249-254.)
When TiN particles are added, the strength and toughness of silicon nitride ceramics can be significantly improved, but the hardness is still low (Zou B, Huang C, Chen M, et al.Study of the mechanical properties, toughening and strengthening mechanisms of Si 3 N 4 / Si 3 N 4 w / TiN nanocomposite ceramic tool materials[J].Acta Mater,2007,55(12):4193-4202.)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Submicron α-Si 3 N 4 (0.5μm)+nano α-Si 3 N 4 (25nm)+micron (W,Ti)C(1μm), the content (volume percentage) of each component in the nanocomposite material is: 54% micron α-Si 3 N 4 , 18% nanometer α-Si 3 N 4 , 4.8% high purity Y 2 o 3 , 3.2% micron Al 2 o 3 , 20% micron (W,Ti)C.

[0017] The preparation process of the gradient nanocomposite ceramic cutter material of the present invention is as follows:

[0018] 1. Preparation of raw materials: use absolute ethanol as the medium, respectively prepare micron α-Si 3 N 4 , Nano α-Si 3 N 4 , µm Al 2 o 3 and micron (W, Ti)C raw material powders for ball milling, and the ball milling process is carried out on a planetary ball mill. where α-Si 3 N 4 、Al 2 o 3 The powder was ball milled for 24 hours to break up larger agglomerated particles to obtain a more uniform powder, and (W,Ti)C powder was ball milled for 240 hours to reduce the powder particle size to about 1 μm, then vacuum dried, sieved, and packaged...

Embodiment 2

[0024] Submicron α-Si 3 N 4 (0.5μm)+nano α-Si 3 N 4 (25nm)+micron (W,Ti)C(1μm), the content (volume percentage) of each component in the nanocomposite material is: 57.75% micron α-Si 3 N 4 , 19.25% nano α-Si 3 N 4 , 4.8% high purity Y 2 o 3 , 3.2% micron Al 2 o 3 , 15% micron (W,Ti)C.

[0025] The preparation process of the gradient nanocomposite ceramic cutter material of the present invention is as follows:

[0026] 1. Preparation of raw materials: use absolute ethanol as the medium, respectively prepare micron α-Si 3 N 4 , Nano α-Si 3 N 4 , µm Al 2 o 3 and micron (W, Ti)C raw material powders for ball milling, and the ball milling process is carried out on a planetary ball mill. where α-Si 3 N 4 、Al 2 o 3 The powder was ball milled for 24 hours to break up larger agglomerated particles to obtain a more uniform powder, and (W,Ti)C powder was ball milled for 240 hours to reduce the powder particle size to about 1 μm, then vacuum dried, sieved, and package...

Embodiment 3

[0032] Submicron α-Si 3 N 4 (0.5μm)+nano α-Si 3 N 4 (25nm)+micron (W,Ti)C(1μm), the content (volume percentage) of each component in the nanocomposite material is: 50.25% micron α-Si 3 N 4 , 16.75% nano α-Si 3 N 4 , 4.8% high purity Y 2 o 3 , 3.2% micron Al 2 o 3 , 20% micron (W,Ti)C.

[0033] The preparation process of the gradient nanocomposite ceramic cutter material of the present invention is as follows:

[0034] 1. Preparation of raw materials: use absolute ethanol as the medium, respectively prepare micron α-Si 3 N 4 , Nano α-Si 3 N 4 , µm Al 2 o 3 and micron (W, Ti)C raw material powders for ball milling, and the ball milling process is carried out on a planetary ball mill. where α-Si 3 N 4 , Al2O3 powder was ball milled for 24 hours to break up larger agglomerated particles to obtain a more uniform powder, (W,Ti)C powder was ball milled for 240 hours to reduce the particle size of the powder to about 1 μm, and then vacuum dried, sieved, and packaged...

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Abstract

The invention belongs to the technical field of material science, and particularly relates to a method for preparing a silicon nitride-tungsten carbide titanium nano-composite ceramic cutting tool material. The method is characterized in that proper amount of nanoscale alpha-Si3N4 and micron-sized (W, Ti) C powder are added into micron-sized alpha-Si3N4 matrix, Al2O3 and Y2O3 are taken as sintering aid, the compound powder is sintered in vacuum environment by hot pressed sintering technologies of temperature rise section by section and uniform heating. The nano-composite ceramic cutting tool material has high hardness, bending strength and fracture toughness, good wear resistance and high temperature stability. The gradient nano-composite ceramic material is applicable to manufacturing cutting tools and nozzles having high requirement on high temperature resistance and wear resistance.

Description

technical field [0001] The invention belongs to the technical field of ceramic materials, and relates to a method for preparing a silicon nitride-tungsten carbide nanometer composite ceramic tool material. Background technique [0002] Cutting is the dominant processing method in the machinery manufacturing industry. The development of tool materials plays a decisive role in the progress of cutting. Ceramic tools have high wear resistance, heat resistance, oxidation resistance and other advantages. In the 1980s Since then, breakthroughs have been made, and ceramic cutting tool materials will surely become one of the most important cutting tool materials in the 21st century. Silicon nitride ceramics are widely used in cutting tools due to their excellent properties such as high strength, high thermal shock resistance, high wear resistance, and chemical stability, but their hardness and fracture toughness are low. [0003] Adding nanoparticles to ceramic materials can effecti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/584C04B35/56C04B35/622
Inventor 赵军田宪华刘帅宫兆超
Owner SHANDONG UNIV
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