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WC-Co-cBN composite hard alloy and preparation method thereof

A cemented carbide, wc-co-cbn technology, applied in metal processing equipment, transportation and packaging, etc., can solve the problems of poor thermal stability of cBN, low density of cemented carbide, cBN particles falling off, etc., to achieve wear resistance. Good, strong metallurgical force, fine grain size

Active Publication Date: 2018-02-27
GRIMAT ENG INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, problems such as low density of WC-Co-cBN cemented carbide, shedding of cBN particles, and poor thermal stability of cBN still exist.

Method used

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  • WC-Co-cBN composite hard alloy and preparation method thereof
  • WC-Co-cBN composite hard alloy and preparation method thereof
  • WC-Co-cBN composite hard alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1) Weighing: 82.9% WC powder (Fischer particle size is 0.4 μm) by mass fraction, 12% Co powder (Fischer particle size is 0.8 μm), 0.35% VC powder, 0.25% Cr 3 C 2 Powder, 4% cBN powder coated with Mo on the surface (original Fibonacci particle size 2μm, such as figure 1 shown), 0.5% of 6AlY24Cr70Ni spherical powder (such as figure 2 shown).

[0031] 2) Mixing and ball milling: Weigh raw materials WC powder, Co powder, VC powder, Cr powder in proportion 3 C 2 Add the powder into the rolling ball mill tank, the ball milling medium is anhydrous alcohol, the ball is YG8 ball (Φ6), the ball-to-material ratio is 4:1, the ball milling speed is 60r / min, and the ball milling time is 36h; then add cBN coated with Mo in proportion powder, continue ball milling for 3h under the same ball milling parameters; finally add 6AlY24Cr70Ni powder, and ball mill for 1h.

[0032] 3) Vacuum drying: the drying temperature is 85° C., the vacuum degree is -0.1 Pa, and the drying time is 7 h...

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Abstract

The invention belongs to the technical field of superhard cutting tools, and relates to a WC-Co-cBN composite hard alloy and a preparation method thereof. The WC-Co-cBN composite hard alloy comprisesthe following chemical components of, by weight, 70%-90% of ultrafine / nano WC powder, 3%-15% of Co powder, 0.35%-0.75% of a grain inhibitor, 1%-10.75% of cBN micro powder with a surface plated with aMo, Ni and Ti metal film with excellent high-temperature and chemical stability, and 0.25%-5% of spherical mixed powder selected from Al, Ni, Cr, Y or other combinations; and the components are prepared into the composite hard alloy through spark plasma sintering. According to the WC-Co-cBN composite hard alloy and the preparation method thereof, the grain size of the prepared alloy is small, hardness, strength and toughness is high, wear resistance is good, the difficulty that heat stability of dry cutting is low can be overcome, machining cost is reduced, and the WC-Co-cBN composite hard alloy and the preparation method thereof are particularly suitable for high-performance machining cutting tools.

Description

technical field [0001] The invention belongs to the technical field of superhard cutting tools, and in particular relates to a WC-Co-cBN composite hard alloy and a preparation method thereof. Background technique [0002] cBN is a material second only to diamond in hardness and thermal conductivity. Its hardness and thermal conductivity are much higher than that of WC, and it has high wear resistance. It is a popular research material in the fields of finishing tools, dry cutting tools, and grinding wheel product preparation. [0003] At present, cBN-doped WC-Co cemented carbide has been reported. Among them, the amount of cBN added in the cemented carbide system is relatively high (volume ratio > 20vol%), and relatively coarse-grained cBN powder (above 3 μm) is mostly used. And the content of the binder phase Co is low (<10wt%). Coarse cBN is less likely to undergo phase transition during the densification and sintering process of cemented carbide. The finer the part...

Claims

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Application Information

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IPC IPC(8): C22C29/02C22C1/05B22F3/02B22F3/105
CPCC22C1/051C22C29/02B22F3/02B22F3/105B22F2998/10B22F1/10
Inventor 谢兴铖曹瑞军左冬华林中坤
Owner GRIMAT ENG INST CO LTD
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