SiC-coated hexagonal boron nitride composite powder modified self-lubricating ceramic cutter material and preparation method thereof

A hexagonal boron nitride and composite powder technology, which is applied in the field of ceramic tool materials, can solve the problems of unsuitable self-lubricating ceramic tool materials, etc., and achieve the effects of slowing down adverse effects, excellent mechanical properties, and good lubricating properties

Active Publication Date: 2015-08-19
QILU UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this Ni-coated composite material is suitable for iron-based alloy (Fe-Ni-Cu-Mo) self-lubricating composite materials and Ni-Cr alloy self-lubricating materials, not suitable for alumina-based or TiB 2 Base and other self-lubricating ceramic tool materials

Method used

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  • SiC-coated hexagonal boron nitride composite powder modified self-lubricating ceramic cutter material and preparation method thereof
  • SiC-coated hexagonal boron nitride composite powder modified self-lubricating ceramic cutter material and preparation method thereof
  • SiC-coated hexagonal boron nitride composite powder modified self-lubricating ceramic cutter material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0041] The self-lubricating ceramic tool material modified by adding silicon carbide-coated hexagonal boron nitride composite powder, the volume percentage of each component material is: Al 2 o 3 66.15%, TiC 28.35%, h-BNSiC 5% (based on h-BN contained therein), MgO 0.5%. The preparation method is as follows:

[0042] (1) Take Al in proportion 2 o 3 and TiC were respectively dispersed in absolute ethanol, ultrasonically dispersed and mechanically stirred for 25 minutes, the resulting suspension was mixed, MgO was added in proportion, and then ultrasonically dispersed and mechanically stirred for 25 minutes to obtain a uniformly mixed multi-phase suspension;

[0043] (2) Pour the above-mentioned multi-phase suspension into the ball mill pot, add cemented carbide balls to ensure that the weight ratio of balls to materials is 10:1, fill in nitrogen as a protective atmosphere and continue ball milling for 48 hours;

[0044] (3) Add h-BNSiC composite powder in proportion, ball ...

Embodiment 2

[0048] The self-lubricating ceramic tool material modified by adding silicon carbide-coated hexagonal boron nitride composite powder, the volume percentage of each component is: Al 2 o 3 62.65%, TiC 26.85%, h-BNSiC 10% (based on h-BN contained therein), MgO 0.5%. The preparation method is as follows:

[0049] (1) Weigh an appropriate amount of Al in proportion 2 o 3 and TiC, respectively, dispersed in absolute ethanol, ultrasonically dispersed and mechanically stirred for 20 minutes, the obtained suspension was mixed, an appropriate amount of MgO was added, and then ultrasonically dispersed and mechanically stirred for 20 minutes to obtain a uniformly mixed multi-phase suspension;

[0050] (2) Pour the above-mentioned multi-phase suspension into the ball mill pot, add cemented carbide balls to ensure that the weight ratio of balls to materials is 12:1, fill in nitrogen as a protective atmosphere and continue ball milling for 48 hours;

[0051] (3) Add h-BNSiC composite po...

Embodiment 3

[0055] The self-lubricating ceramic tool material modified by adding silicon carbide-coated hexagonal boron nitride composite powder, the volume percentage of each component is: Al 2 o 3 47%, TiC 47%, h-BNSiC 5% (based on h-BN contained therein), MgO 1%. The preparation method is as follows:

[0056] (1) Take Al in proportion 2 o 3 and TiC, respectively, dispersed in absolute ethanol, ultrasonically dispersed and mechanically stirred for 15 minutes, the obtained suspension was mixed, MgO was added in proportion, and ultrasonically dispersed again and mechanically stirred for 15 minutes to obtain a uniformly mixed multi-phase suspension;

[0057] (2) Pour the above-mentioned multi-phase suspension into the ball mill tank, add cemented carbide balls to ensure that the weight ratio of balls to materials is 10:1, fill in nitrogen as a protective atmosphere and continue ball milling for 36 hours;

[0058] (3) Add h-BNSiC composite powder in proportion and ball mill again for 1...

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Abstract

The invention relates to a SiC-coated hexagonal boron nitride composite powder modified self-lubricating ceramic cutter material and a preparation method thereof. The ceramic cutter material is prepared from the following raw materials in percentage by volume: 20-80% of aluminum oxide, 10-80% of titanium carbide, 1-20% of SiC-coated hexagonal boron nitride composite powder and 0.2-5% of magnesium oxide serving as a sintering aid. The invention further provides the preparation method of the ceramic cutter material; since the surface of hexagonal boron nitride composite powder is coated with SiC, the mechanical property of the material can be enhanced and the wettability of h-BN and a substrate can be improved and therefore agglomeration can be reduced.

Description

technical field [0001] The invention relates to a ceramic cutter material, in particular to a self-lubricating ceramic cutter material modified by adding silicon carbide-coated hexagonal boron nitride composite powder and a preparation method thereof. Background technique [0002] Hexagonal boron nitride (h-BN) is a solid lubricant with excellent friction properties. It can be introduced into a ceramic or metal matrix to obtain a solid self-lubricating material, so that the material itself has the self-lubricating function of reducing friction and wear, and exempts Use of lubricating grease. However, due to the poor mechanical properties of h-BN itself, the existence of defects such as not tightly combined with the matrix, and easy agglomeration, directly adding h-BN to the ceramic or metal matrix can not only obtain the self-lubricating function of the material, but also improve the mechanical properties of the material. This will undoubtedly limit its application in some ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/628C04B35/117
Inventor 许崇海陈辉陈照强衣明东肖光春马骏
Owner QILU UNIV OF TECH
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