High-toughness crystalline cubic boron nitride-based ultrahigh pressure sintering material and cutting tool

Abstract

The invention discloses a high-toughness cBN (cubic boron nitride)-based ultrahigh pressure sintering material and a cutting tool manufactured by the same and having excellent crack resistance. The high-toughness cBN cubic boron nitride-based ultrahigh pressure sintering material and the cutting tool made of the same material comprise at least one powder particle such as Ti nitride powder particles and Al, alloy of Al and Ti, oxide of Al and nitride of Ti and Al as a combined phase forming ingredient in a cBN-based ultrahigh pressure sintering material including the organization of a hard dispersed phase and a combined phase, besides, as the hard dispersed phase forming ingredient, the high-toughness cBN cubic boron nitride-based ultrahigh pressure sintering material and the cutting tool made of the same material comprise cBN, wherein 50% of the accumulation grain size of the powder particles which form the combined phase is 0.6-0.9 microns, furthermore, when the cBN-based ultrahigh pressure sintering material is diffracted by X ray, a diffraction peak of a composite compound of Ti, Al and N appears within a diffraction angle range that 2theta is not smaller than 40.5 degrees and not larger than 41.4 degrees, and I / I0 is not smaller than 0.15 and not larger than 0.3 when the intensity of the diffraction peak of the composite compound of Ti, Al and N is set to be I and the intensity of the diffraction peak of cBN is set to be I0.

Description

technical field [0001] The present invention relates to a high-toughness cubic boron nitride-based ultra-high pressure sintered material and a cutting tool, in particular to a high-toughness cubic boron nitride-based ultra-high pressure sintered material and a cutting tool produced therefrom: The crystalline boron nitride-based ultra-high pressure sintered material has high toughness, so when the cutting tool made from it is used under the condition of interrupted cutting of high-hardness workpiece, it also shows excellent chipping resistance, and exhibits excellent performance after long-term use. cutting performance. Background technique [0002] Conventionally, as materials for cutting tools requiring wear resistance, cubic boron nitride (hereinafter referred to as cBN)-based ultra-high pressure sintered materials (hereinafter referred to as cBN sintered bodies) have been used from the viewpoint of high hardness. As shown in 1, there are known sintered bodies composed of...

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Problems solved by technology

[0002] Conventionally, as materials for cutting tools requiring wear resistance, cubic boron nitride (hereinafter referred to as cBN)-based ultra-high pressure sintered materials (hereinafter referred to as cBN sintered bodies) have been used from the viewpoint of high hardness. As shown in 1, there are known sintered bodies composed of 80 to 40% cBN by volume ratio, and the rest are carbides, nitrides, and boron of transition metals of Group IVa, Va, and VIa of the periodic table Compounds, silicides, or their mixtures or mutual solid solution compounds as the main substance, and substances added with Al and / or Si to these, but when the sintered body is used as a cutting tool material in cutting high hardness steel, there is a resistance Problems such as lack of chipping and wear resistance

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