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

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...

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