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Preparation method of silicon nitride-based self-lubricating ceramic cutter material containing alumina-coated hexagonal boron nitride composite powder

A technology of hexagonal boron nitride and composite powder, which is applied in the field of preparation of silicon nitride-based self-lubricating ceramic tool materials, can solve problems such as inapplicability, and achieve improved mechanical properties, fracture toughness and flexural strength, and mechanical properties. Effect

Active Publication Date: 2015-09-09
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this carbon-coated hexagonal boron nitride method is not suitable for silicon nitride-based self-lubricating ceramic tool materials

Method used

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  • Preparation method of silicon nitride-based self-lubricating ceramic cutter material containing alumina-coated hexagonal boron nitride composite powder
  • Preparation method of silicon nitride-based self-lubricating ceramic cutter material containing alumina-coated hexagonal boron nitride composite powder
  • Preparation method of silicon nitride-based self-lubricating ceramic cutter material containing alumina-coated hexagonal boron nitride composite powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Adding aluminum oxide-coated hexagonal boron nitride composite powder, silicon nitride-based self-lubricating ceramic tool material, the volume percentage of each raw material component is micron silicon nitride (α-Si 3 N 4 )62%, nano-silicon nitride (α-Si 3 N 4 ) 10%, micron titanium carbide 10%, alumina 3.2%, yttrium oxide 4.8%, alumina-coated hexagonal boron nitride 10%.

[0034] In proportion, weigh micron silicon nitride (α-Si 3 N 4 ), nano silicon nitride (α-Si 3 N 4 ), micron titanium carbide, aluminum oxide, yttrium oxide. Use an appropriate amount of absolute ethanol as the dispersion medium, respectively configure micron silicon nitride, micron titanium carbide suspension and nano silicon nitride suspension, and ultrasonically disperse for 15 minutes while fully stirring. The obtained micron silicon nitride, micron titanium carbide suspension and nano silicon nitride suspension were mixed, then aluminum oxide and yttrium oxide were added to prepare a mi...

Embodiment 2

[0039] Silicon nitride-based self-lubricating ceramic tools with aluminum oxide-coated hexagonal boron nitride powder added, the volume percentage of each raw material component is micron silicon nitride (α-Si 3 N 4 )67%, nano-silicon nitride (α-Si 3 N 4 ) 10%, micron titanium carbide 10%, alumina 3.2%, yttrium oxide 4.8%, alumina-coated hexagonal boron nitride 5%.

[0040] In proportion, weigh micron silicon nitride (α-Si 3 N 4 ), nano silicon nitride (α-Si 3 N 4 ), micron titanium carbide, aluminum oxide, yttrium oxide. Use an appropriate amount of absolute ethanol as the dispersion medium, respectively configure micron silicon nitride, micron titanium carbide suspension and nano silicon nitride suspension, and ultrasonically disperse for 15 minutes while fully stirring. The obtained micron silicon nitride, micron titanium carbide suspension and nano silicon nitride suspension were mixed, then aluminum oxide and yttrium oxide were added to prepare a mixed suspension, ...

Embodiment 3

[0044] The volume percentage of each raw material component of silicon nitride-based self-lubricating ceramic tools with alumina-coated hexagonal boron nitride powder is micron silicon nitride (α-Si 3 N 4 )57%, nano-silicon nitride (α-Si 3 N 4 ) 10%, micron titanium carbide 10%, alumina 3.2%, yttrium oxide 4.8%, alumina-coated hexagonal boron nitride 15%.

[0045] In proportion, weigh micron silicon nitride (α-Si 3 N 4 ), nano silicon nitride (α-Si 3 N 4 ), micron titanium carbide, aluminum oxide, yttrium oxide. Use an appropriate amount of absolute ethanol as the dispersion medium, respectively configure micron silicon nitride, micron titanium carbide suspension and nano silicon nitride suspension, and ultrasonically disperse for 15 minutes while fully stirring. The obtained micron silicon nitride, micron titanium carbide suspension and nano silicon nitride suspension were mixed, then aluminum oxide and yttrium oxide were added to prepare a mixed suspension, fully stir...

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Abstract

The invention relates to a preparation method of a silicon nitride-based self-lubricating ceramic cutter material containing alumina-coated hexagonal boron nitride composite powder. The silicon nitride-based self-lubricating ceramic cutter material comprises, by volume, 57-70% of micrometer silicon nitride, 5-15% of nanometer silicon nitride, 5-15% of micrometer titanium carbide, 3.2% of alumina, 4.8% of yttrium oxide, and 2-15% of alumina-coated hexagonal boron nitride. The preparation method comprises preparing alumina-coated hexagonal boron nitride composite powder with particle sizes of 4-12 micrometers, weighing micrometer silicon nitride, nanometer silicon nitride and micrometer titanium carbide, respectively preparing their suspension liquids, carrying out ultrasonic dispersion, carrying out mixing, adding alumina and yttrium oxide into the mixture, carrying out ultrasonic dispersion for 15-20min to obtain a composite suspension liquid, carrying out ball milling, adding the alumina-coated hexagonal boron nitride composite powder into the composite suspension liquid, carrying out ball milling, carrying out vacuum drying to obtain mixed powder and carrying out vacuum hot pressing sintering molding. The silicon nitride-based self-lubricating ceramic cutter material containing alumina-coated hexagonal boron nitride composite powder can improve ceramic cutter mechanical properties and guarantee self-lubricating performances.

Description

technical field [0001] The invention relates to a method for preparing a silicon nitride-based self-lubricating ceramic tool material, especially a method for preparing a silicon nitride-based self-lubricating ceramic tool material with alumina-coated hexagonal boron nitride composite powder, which belongs to the technology of self-lubricating tool materials field. Background technique [0002] In the process of metal cutting, the negative effects brought by the use of cutting fluid are becoming more and more obvious, such as polluting the environment, endangering the health of workers, and increasing the production cost of enterprises due to the processing of cutting fluid. Therefore, it is necessary to cancel cutting fluid and replace it with dry Type cutting can well solve the above problems. Therefore, people put forward the concept of self-lubricating tools, which is to add solid lubricants to the tools, so that the solid lubricants can be dispersed in the tools, so th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/584C04B35/10C04B35/628
Inventor 许崇海马骏肖光春衣明东陈照强陈辉
Owner QILU UNIV OF TECH
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