Graphene oxide coated Si3N4 composite powder added Al2O3-based ceramics cutting tool material and preparation method thereof

A composite powder and composite ceramic technology, which is applied in the field of preparation of alumina-based composite ceramic tool materials, can solve the problems of sheet body affecting toughening and reinforcing properties, pore structure defects, and difficulty in dispersing sheet layers.

Inactive Publication Date: 2018-01-23
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are strong van der Waals forces between the graphene sheets, and it is difficult to achieve good dispersion between the sheets.
For this reason, as a reinforcing phase, there is a serious agglomeration phenomenon in the ceramic material, which is not tightly combined with the matrix and causes structural defects such as pores.
In addition, the graphene flakes are arranged in layers perpendicular to the hot-pressing direction in the matrix, and the orientation of the flakes seriously affects its toughening and strengthening properties in the matrix material.

Method used

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  • Graphene oxide coated Si3N4 composite powder added Al2O3-based ceramics cutting tool material and preparation method thereof
  • Graphene oxide coated Si3N4 composite powder added Al2O3-based ceramics cutting tool material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0052] Embodiment 1. An alumina-based composite ceramic tool material with added graphene oxide-coated silicon nitride composite powder is formed by hot-pressing and sintering the raw materials in the following mass percentages:

[0053] Graphene oxide coated silicon nitride 10.5%, magnesium oxide 0.25%, molybdenum 0.5%, nickel 1%, the rest is Al 2 o 3 .

[0054] The preparation steps are as follows:

[0055] 1. Set the mass to Al 2 o 3 Add 1% polyethylene glycol by mass to absolute ethanol to dissolve completely, ultrasonically disperse and mechanically stir for 15 minutes; add Al with an average radius of 200nm 2 o 3 Powder, continue to ultrasonically disperse and mechanically stir for 15 minutes to obtain Al 2 o 3 Dispersions.

[0056] 2. Add the sintering aid MgO with an average particle size of 0.5 μm and metal Ni and Mo with an average particle size of 15 μm to the Al described in step 1 2 o 3 In the dispersion liquid, then ultrasonically disperse and mechanica...

Embodiment 2

[0062] Embodiment 2, an alumina-based composite ceramic tool material with graphene oxide-coated silicon nitride composite powder added, is formed by hot-pressing and sintering the raw materials in the following mass percentages:

[0063] Graphene coated silicon nitride 21%, magnesium oxide 0.5%, molybdenum 1%, nickel 1.25%, the rest is Al 2 o 3 .

[0064] 1. Set the mass to Al 2 o 3 Add 2% polyethylene glycol by mass to absolute ethanol to dissolve completely, ultrasonically disperse and mechanically stir for 25 minutes; add Al with an average radius of 200nm 2 o 3 , continue ultrasonic dispersion and mechanical stirring for 30min to obtain Al 2 o 3 Dispersions.

[0065] 2. Add the sintering aid MgO with an average particle size of 1 μm and metal Ni and Mo with an average particle size of 20 μm to the Al described in step 1 2 o 3 Dispersion liquid, then ultrasonically dispersed and mechanically stirred for 20min to obtain a well-mixed suspension.

[0066] 3. Pour th...

Embodiment 3

[0071] Embodiment 3. An alumina-based composite ceramic tool material with graphene oxide-coated silicon nitride composite powder added is formed by hot-pressing and sintering the raw materials in the following mass percentages:

[0072] Graphene coated silicon nitride 26.25%, magnesium oxide 0.75%, molybdenum 2%, nickel 2.5%, the rest is Al 2 o 3 .

[0073] 1. Set the mass to Al 2 o 3 Add 5% polyethylene glycol by mass to absolute ethanol to dissolve completely, ultrasonically disperse and mechanically stir for 30min; add Al with an average radius of 200nm 2 o 3 , continue ultrasonic dispersion and mechanical stirring for 30min to obtain Al 2 o 3 Dispersions.

[0074] 2. Add the sintering aid MgO with an average particle size of 2 μm and metal Ni and Mo with an average particle size of 30 μm to the Al described in step 1 2 o 3 Dispersion liquid, then ultrasonically dispersed and mechanically stirred for 30min to obtain a well-mixed suspension.

[0075] 3. Pour the s...

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Abstract

The invention relates to a graphene oxide coated Si3N4 composite powder added Al2O3-based ceramics cutting tool material and a preparation method thereof. The ceramics cutting tool material is characterized in that Al2O3 is used as a substrate; graphene oxide coats Si3N4 to be used as a reinforcement phase; and MgO, Ni and Mo are used as sintering additives. The preparation method of the ceramicscutting tool material comprises steps such as the step of preparing graphene oxide coated Si3N4 powder, the step of mixing cutting tool material powder, the step of drying and sieving, the step of cold pressing and die filling, and the step of thermally pressing and sintering. The graphene oxide coated SI3N4 composite powder is added into the nano composite ceramics cutting tool material, thus obviously improving the fracture toughness and the flexure strength of the material. According to the ceramics cutting tool material, the defect problems on microstructure, such as air pores which are caused by non-uniform dispersing and particle conglomerating of graphene oxide and nanoparticles in a composite ceramic substrate and other phenomena, and untight combination with the substrate, can beeffectively solved; and meanwhile, the problem of orientation of graphene in the ceramics substrate can be avoided.

Description

technical field [0001] The invention relates to a preparation method of an alumina-based composite ceramic cutting tool material, in particular to an alumina-based ceramic cutting tool material added with graphene oxide-coated silicon nitride composite powder and a preparation method thereof. Background technique [0002] Alumina-based ceramic cutting tools have the advantages of high hardness, excellent wear resistance and high temperature mechanical properties, good chemical stability, and are not easy to bond with metals. They are widely used in cutting difficult-to-machine materials, ultra-high-speed cutting, high-speed dry cutting and hard cutting etc. However, the brittleness of alumina-based ceramic tool material as a kind of ceramic material limits its further development as an excellent ceramic tool material. Therefore, the toughening and strengthening of alumina ceramic cutting tool materials is a research hotspot in this field. The alumina-based nanocomposite ce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/622C04B35/645
Inventor 许崇海张文亮肖光春陈照强衣明东
Owner QILU UNIV OF TECH
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