Silicon nitride based ceramic cutting tool material and preparation method thereof

A ceramic tool, silicon nitride-based technology, applied in the field of silicon nitride-based ceramic tool material and its preparation, can solve the problems of low hardness and wear resistance, difficult sintering, etc.

Inactive Publication Date: 2012-07-18
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

with general Al 2 o 3 Compared with ceramic-based ceramics, its main characteristics are higher bending strength and fractu

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) First, add polyacrylic acid with a molecular weight of 4000 and polyethylene glycol with a molecular weight of 400 into deionized water, so that the mass concentration of polyacrylic acid is 0.6%, and the mass concentration of polyethylene glycol is 1.6%, and then stirred to prepare into a dispersant solution, and adjust the pH of the dispersant solution to 9 with ammonia;

[0024] (2) Mix the silicon nitride-based ceramic tool material raw material with a dispersant solution with a pH value of 9 and add it to the ball mill barrel, where the volume percentage of the solid phase is 35%, and use zirconia balls for ball milling for 24 hours, and then Dry at 60°C for 48 hours, and then pass through a 40-mesh sieve to make a mixed powder, in which the components of the silicon nitride-based ceramic tool material raw materials are Si 3 N 4 Powder 80%, Ti (C 0.7 N 0.3 ) powder 8%, Y with a particle size of 0.08μm 2 o 3 Powder 8%, Al with particle size 0.08μm 2 o 3 P...

Embodiment 2

[0028] (1) First, add polyacrylic acid with a molecular weight of 20,000 and polyethylene glycol with a molecular weight of 400 into deionized water so that the mass concentration of polyacrylic acid is 1.2%, and the mass concentration of polyethylene glycol is 0.6%, and then stirred to prepare into a dispersant solution, and adjust the pH value of the dispersant solution to 12 with ammonia water;

[0029] (2) Mix the silicon nitride-based ceramic tool material raw material with a dispersant solution with a pH value of 12 and add it to the ball mill barrel, where the volume percentage of the solid phase is 45%, and use zirconia balls for ball milling for 24 hours, and then Dry at 120°C for 12 hours, and then pass through a 40-mesh sieve to make a mixed powder, in which the components of the silicon nitride-based ceramic tool material raw materials are calculated by weight percentage Si 3 N 4 Powder 95%, Ti (C 0.1 N 0.9 ) powder 2%, Y with a particle size of 0.1 μm 2 o 3 Pow...

Embodiment 3

[0033] (1) First, add polyacrylic acid with a molecular weight of 10,000 and polyethylene glycol with a molecular weight of 400 into deionized water, so that the mass concentration of polyacrylic acid is 1.0%, and the mass concentration of polyethylene glycol is 1.2%, and then stirred to prepare into a dispersant solution, and adjust the pH value of the dispersant solution to 10 with ammonia water;

[0034] (2) Mix the silicon nitride-based ceramic tool material raw material with a dispersant solution with a pH value of 10 and add it to the ball mill barrel, where the volume percentage of the solid phase is 40%, and use zirconia balls for ball milling for 16 hours, and then Dry at 100°C for 30 hours, and then pass through a 40-mesh sieve to make a mixed powder, in which the components of the silicon nitride-based ceramic tool material raw materials are calculated by weight percentage Si 3 N 4 Powder 90%, Ti (C 0.5 N 0.5 ) powder 1%, Y with a particle size of 0.09 μm 2 o 3...

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Abstract

The invention relates to the technical field of ceramic cutting tool materials, and in particular relates to a silicon nitride based ceramic cutting tool material and a preparation method thereof. The method comprises the following steps of: adding a dispersing agent to deionized water to prepare a dispersing agent solution; mixing the raw materials of the silicon nitride based ceramic cutting tool material and the dispersing agent solution by weight percentage: 80%-95% of Si3N4, 1%-8% of Ti(C1-XNX) with the X between 0.3 and 0.9, 2%-8% of Y2O3 and 1%-4% of Al2O3; ball-milling, drying and sieving by a 40-mesh sieve to obtain mixed powder; and subjecting the mixed powder to hot-pressing at the temperature between 1650 and 1750 DEG C and under the pressure between 20 and 40MPa to obtain the silicon nitride based ceramic cutting tool material. The material has higher mechanical property and the Vickers hardness, the bending strength and the fracture toughness are respectively 90-92GPa, 950-1219MPa and 10-16MPa.m1/2.

Description

technical field [0001] The invention relates to the technical field of ceramic tool materials, in particular to a silicon nitride-based ceramic tool material and a preparation method thereof. Background technique [0002] With the development of high and new technologies, the machining industry has put forward more stringent and demanding requirements for tool materials. For example, processing materials with higher hardness, higher cutting efficiency, finishing and realizing unmanned operation, etc., this requires improving the strength, toughness, wear resistance and thermal shock resistance of tool materials. Silicon nitride-based ceramic cutting tool materials with high purity Si 3 N 4 powder as raw material, add Y 2 o 3 , MgO, ZrO 2 and HfO 2 Other sintering agent or wear-resistant phase Al 2 o 3 Or strengthened phase SiCw, etc. sintered. Silicon nitride-based ceramic tools are suitable for cutting materials such as cast iron, high-temperature alloys and nickel...

Claims

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Application Information

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IPC IPC(8): C04B35/584C04B35/622C04B35/634
Inventor 孙旭东修稚萌霍地李继光李晓东苏利红朱福生何殿宁
Owner NORTHEASTERN UNIV
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