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
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[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, an...
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...
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...
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