Preparation method of self-lubricating ceramic cutting tool material comprising spherical nanometer silicon dioxide coated hexagonal boron nitride composite powder

The technology of nano-silica and spherical silica is applied in the field of self-lubricating ceramic tool materials, which can solve the problems of easy agglomeration of self-lubricating ceramic tool materials, low mechanical properties of solid lubricant particles, and poor matrix bonding. Achieve the effect of inhibiting the growth of grains, good self-lubricating performance, and good high temperature oxidation resistance

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

AI Technical Summary

Problems solved by technology

[0004] The main reasons for the decline in the mechanical properties of self-lubricating ceramic tool materials are the low mechanical properties of the solid lubricant particles themselves, the loose combination with the matrix, and easy agglomeration.

Method used

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  • Preparation method of self-lubricating ceramic cutting tool material comprising spherical nanometer silicon dioxide coated hexagonal boron nitride composite powder
  • Preparation method of self-lubricating ceramic cutting tool material comprising spherical nanometer silicon dioxide coated hexagonal boron nitride composite powder
  • Preparation method of self-lubricating ceramic cutting tool material comprising spherical nanometer silicon dioxide coated hexagonal boron nitride composite powder

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Example 1, adding spherical nano-silica coated hexagonal boron nitride composite powder self-lubricating ceramic tool material, the volume percentage of each component material is: Al 2 o 3 66.15%, TiC 28.35%, h-BNSiO 2 5%, MgO 0.5%. The preparation steps are as follows:

[0033] (1)h-BNSiO 2 Preparation of composite powder:

[0034] Weigh 1 g of h-BN micron powder with an average particle size of 10 μm and disperse it in 100 mL of absolute ethanol, ultrasonically disperse for 10 min, add 4.5 mL of distilled water and 4 mL of ammonia water, the pH value is about 8.5, and transfer the obtained mixture into three In the flask, stir magnetically and heat in a water bath until the temperature is 45°C. Keeping the temperature at 45°C, add ethyl orthosilicate dropwise to the above mixed solution. The dropping method is as follows: divide 12mL of ethyl orthosilicate into 3 parts, and add one part of ethyl orthosilicate dropwise within 1.5h; After 0.5h, add the second por...

Embodiment 2

[0042] A self-lubricating ceramic tool material with spherical nano-silica coated hexagonal boron nitride composite powder, the volume percentage of each component is: Al 2 o 3 62.65%, TiC 26.85%, h-BNSiO 2 10%, MgO 0.5%. The preparation steps are as follows:

[0043] (1) with embodiment 1;

[0044] (2) 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, after mixing the obtained suspension, adding a certain amount of MgO, ultrasonically dispersed again and mechanically stirred for 20 minutes to obtain a uniformly mixed multi-phase suspension;

[0045] (3) 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;

[0046] (4) Add h-BNSiO in proportion 2 The composit...

Embodiment 3

[0050] A self-lubricating ceramic tool material with spherical nano-silica coated hexagonal boron nitride composite powder, the volume percentage of each component is: Al 2 o 3 47%, TiC 47%, h-BNSiO 2 5%, MgO 1%. The preparation steps are as follows:

[0051] (1) with embodiment 1;

[0052] (2) Weigh Al in proportion 2 o 3 and TiC, and respectively dispersed in absolute ethanol, ultrasonically dispersed and mechanically stirred for 15 minutes, the obtained suspension was mixed, an appropriate amount of MgO was added, and then ultrasonically dispersed and mechanically stirred for 15 minutes to obtain a uniformly mixed multi-phase suspension;

[0053] (3) 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 36 hours;

[0054] (4) Add h-BNSiO in proportion 2 The composite powder was ball mille...

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Abstract

The invention relates to a preparation method of self-lubricating ceramic cutting tool material comprising spherical nanometer silicon dioxide coated hexagonal boron nitride composite powder. The self-lubricating ceramic cutting tool material comprises the following raw material components in percentage by volume: 15-75% of TiC, 2-20% of h-BN@SiO2, 0.2-2.5% of MgO and the balance of Al2O3, wherein the h-BN@SiO2 is the spherical silicon dioxide coated hexagonal boron nitride composite powder which is obtained by dispersing h-BN powder in absolute ethyl alcohol and dropwise adding tetraethyl orthosilicate at the temperature of 30-70 DEG C. The invention also provides the preparation method of the self-lubricating ceramic cutting tool material. The added h-BN@SiO2 can improve the wettability of h-BN@SiO2 and a matrix and the mechanical property of the cutting tool material when the excellent lubricating property of the cutting tool material is remained, and reduce the agglomeration of air holes and the h-BN@SiO2 and the negative influence of the added h-BN on the mechanical property of the self-lubricating ceramic cutting tool material. The self-lubricating ceramic cutting tool material is suitable for application in manufacturing of self-lubricating ceramic cutting tools and can also be used for manufacturing ceramic molds, bearings and other wear-resisting anti-corrosion components and parts.

Description

technical field [0001] The invention relates to a self-lubricating ceramic cutting tool material, in particular to a preparation method of a self-lubricating ceramic cutting tool material added with spherical nano-silicon dioxide coated hexagonal boron nitride composite powder. Background technique [0002] Self-lubricating ceramic tools have good lubricating properties, which can significantly reduce the friction coefficient between the tool and the workpiece material, and achieve the unity of wear reduction and wear resistance of ceramic tools without adding lubricating fluid, which makes self-lubricating ceramics The tool is especially suitable for dry cutting without cutting fluid, and has a wide application prospect in modern processing technology. [0003] Adding solid lubricant as an additive phase to the matrix of ceramic cutting tool material is one of the effective ways to realize the self-lubricating function of the cutting tool. Hexagonal boron nitride (h-BN) is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/117C04B35/628C04B35/622
Inventor 许崇海陈辉衣明东肖光春陈照强马骏
Owner QILU UNIV OF TECH
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