Glomerocryst cubic boron nitride composite sheet and preparation method for same

A technology of polycrystalline cubic boron nitride, applied in chemical instruments and methods, layered products, metal layered products, etc., can solve the problems of short service life and low chipping efficiency of polycrystalline cubic boron nitride composite sheets, Achieve the effect of increased cutting depth, extended service life, and no desoldering

Active Publication Date: 2013-06-19
ZHENGZHOU BERLT HARD MATERIALS
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AI-Extracted Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is that the existing polycrystalline cubic boron nitride composite sheet has short service life and low chippi...
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Abstract

The invention discloses a glomerocryst cubic boron nitride composite sheet and a preparation method for the same. The glomerocryst cubic boron nitride composite sheet comprises a hard alloy matrix and a glomerocryst cubic boron nitride layer, wherein the glomerocryst cubic boron nitride layer is prepared from the raw materials in the following parts by weight: 70-85 parts of cubic boron nitride micro-powder, 10-15 parts of metallic bond, and 5-10 parts of ceramic additive. The method is performed according to the following steps of: A, uniformly mixing; and B, filling the mixture and the hard alloy matrix in a molybdenum cup provided with a salt tube shielding layer for isolating, heating, and synthesising. Compared with the prior art, the glomerocryst cubic boron nitride composite sheet and the preparation method for the same disclosed by the invention have the beneficial effects that the service life of the composite sheet is prolonged, unsoldering phenomenon is avoided, and cutting efficiency is good.

Application Domain

Metal layered products

Technology Topic

Cemented carbideMetal binding +3

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  • Glomerocryst cubic boron nitride composite sheet and preparation method for same

Examples

  • Experimental program(8)

Example Embodiment

[0022] Embodiment 1: A preparation method of polycrystalline cubic boron nitride composite sheet, characterized in that it is carried out according to the following steps:
[0023] A. Mix 70g of cubic boron nitride powder, 10g of metal bond and 10g of ceramic additives. The particle size of the cubic boron nitride powder is 20~30um, the particle size of the metal bond is less than or equal to 10um, and the particle size of the ceramic additive is less than Equal to 10um;
[0024] B. Put the mixture 4 and the cemented carbide substrate 2 into the molybdenum cup 1 separated by the shielding layer of the salt tube 3, where the mixture is placed on both sides of the cemented carbide substrate 2, and put the installed salt tube 3 into Graphite mold, insert the graphite mold into pyrophyllite block 5, put the pyrophyllite block into cubic boron nitride six-sided top press for pressing and sintering. The sintering process is as follows: firstly, the pressure is increased to 5.0~8.5GPa, and then the temperature is increased to 1300~1800℃, heating for 1~2min and then cooling, synthesis 6min~15min. The synthesis time includes heating time and cooling time.
[0025] In this embodiment, in order to increase the production efficiency, two molybdenum cups can be placed in the salt tube. One or more molybdenum cups can also be placed in the salt tube according to actual processing needs.
[0026] In this embodiment, it is also possible to arrange the mixture only on one side of the cemented carbide substrate.
[0027] In this embodiment, 10 g of the metal bond contains 4 g of cobalt, 4 g of nickel and 2 g of aluminum. 10g of ceramic additives contains 3g of Ti(C, N) and 2g of Al 2 O 3 , 3g of AlB, 2g of SiC.
[0028] In this embodiment, the mass content of Co in the cemented carbide substrate is 9-15%, which can ensure that the thermal expansion coefficient of the cemented carbide substrate is close to that of polycrystalline cubic boron nitride. Cracks occur between the contact surface between cubic boron nitride and the cemented carbide substrate.

Example Embodiment

[0029] Embodiment 2: A preparation method of polycrystalline cubic boron nitride composite sheet is carried out according to the following steps:
[0030] A. Mix 75g of cubic boron nitride powder, 14g of metal bond and 9g of ceramic additives uniformly. The particle size of the cubic boron nitride powder is 20-30 um, the particle size of the metal bond is less than or equal to 10um, and the particle size of the ceramic additive is less than Equal to 10um;
[0031] B. Put the mixture and the cemented carbide substrate into a molybdenum cup isolated by the salt tube shielding layer, where the mixture is placed on both sides of the cemented carbide substrate, put the installed salt tube into the graphite mold, and place the graphite mold Put the pyrophyllite block into the cubic boron nitride six-sided top press for pressing and sintering. The sintering process is as follows: first increase the pressure to 5.0~8.5GPa, then heat to 1300~1800℃, and heat 1 After ~2min, start to cool and synthesize for 6min~15min. The synthesis time includes heating time and cooling time.
[0032] In this embodiment, in order to increase the production efficiency, two molybdenum cups can be placed in the salt tube. One or more molybdenum cups can also be placed in the salt tube according to actual processing needs.
[0033] In this embodiment, it is also possible to arrange the mixture only on one side of the cemented carbide substrate.
[0034] In this embodiment, 14 g of the metal bonding agent contains 6 g of cobalt, 3.5 g of nickel and 4.5 g of aluminum. 9g ceramic additives contain 3g Ti (C, N), 1.5g Al 2 O 3 , 2.7g of AlB, 1.8g of SiC.
[0035] In this embodiment, the mass content of Co in the cemented carbide substrate is 9-15%, which can ensure that the thermal expansion coefficient of the cemented carbide substrate is close to that of polycrystalline cubic boron nitride. Cracks occur between the contact surface between cubic boron nitride and the cemented carbide substrate.

Example Embodiment

[0036] Embodiment 3: A preparation method of polycrystalline cubic boron nitride composite sheet is carried out according to the following steps:
[0037] A. Mix 80g of cubic boron nitride powder, 15g of metal bond and 8g of ceramic additives uniformly. The particle size of the cubic boron nitride powder is 20-30 um, the particle size of the metal bond is less than or equal to 10um, and the particle size of the ceramic additive is less than Equal to 10um;
[0038] B. Put the mixture and the cemented carbide substrate into a molybdenum cup isolated by the salt tube shielding layer, where the mixture is placed on both sides of the cemented carbide substrate, put the installed salt tube into the graphite mold, and place the graphite mold Put the pyrophyllite block into the cubic boron nitride six-sided top press for pressing and sintering. The sintering process is as follows: first increase the pressure to 5.0~8.5GPa, then heat to 1300~1800℃, and heat 1 After ~2min, start to cool and synthesize for 6min~15min. The synthesis time includes heating time and cooling time.
[0039] In this embodiment, in order to increase the production efficiency, two molybdenum cups can be placed in the salt tube. One or more molybdenum cups can also be placed in the salt tube according to actual processing needs.
[0040] In this embodiment, it is also possible to arrange the mixture only on one side of the cemented carbide substrate.
[0041] In this embodiment, 15 g of the metal bond contains 7 g of cobalt, 4 g of nickel, and 4 g of aluminum. 8g ceramic additives contain 3g Ti (C, N), 1.5g Al 2 O 3 , 2g of AlB, 1.5g of SiC.
[0042] In this embodiment, the mass content of Co in the cemented carbide substrate is 9-15%, which can ensure that the thermal expansion coefficient of the cemented carbide substrate is close to that of polycrystalline cubic boron nitride. Cracks occur between the contact surface between cubic boron nitride and the cemented carbide substrate.

PUM

PropertyMeasurementUnit
Granularity20.0 ~ 30.0µm
Granularity<= 10.0µm

Description & Claims & Application Information

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