WC-Co hard alloy with binding phase enhanced by Ni3Al and preparation method thereof

A cemented carbide and binder phase technology, which is applied in the field of cemented carbide materials and its preparation, can solve the problems of complex phase composition, long preparation cycle, complex process, etc., achieve uniform structure, avoid heat accumulation, and have good dispersion effect Effect

Active Publication Date: 2012-03-21
ZHUZHOU HARD ALLOY GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The formation of Ni 3 The Al phase method is to add intermediate compounds AlN and Cr during the wet grinding process. 2 N, then AlN and Cr 2 After the sintering temperature exceeds 1300 °C, N undergoes a de-N reaction to form Al and Cr, and then metal Al and Cr diffuse into the (Co+Ni) binder phase to synthesize Ni in situ 3 Al phase produces precipitation and solid solution strengthening, and its phase composition is complex and difficult to control
Moreover, the process requires solid solution and aging treatment, the process is complicated, and the preparation cycle is long

Method used

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  • WC-Co hard alloy with binding phase enhanced by Ni3Al and preparation method thereof
  • WC-Co hard alloy with binding phase enhanced by Ni3Al and preparation method thereof
  • WC-Co hard alloy with binding phase enhanced by Ni3Al and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0016] Embodiment 1: According to figure 1 The flow shown, press Ni 25 The composition ratio of Al, the mass percentage is 2.07% nickel powder and aluminum powder, mixed with the rest of the WC powder evenly; the above mixed powder is placed in a graphite container to pave the thickness of 50 mm, under a non-oxidizing atmosphere, with 5 The heating rate of ℃ / min is heated to 1100 ℃, kept for 7 hours, and then cooled naturally to obtain WC and nickel-aluminum intermetallic compound Ni 3 A mixture of Al; the mixture is ground, crushed, and passed through a 120-mesh sieve to obtain WC+Ni with a particle size of 120 μm or less 3 Mixed powder of Al; the above WC+Ni 3 The mixed powder of Al was subjected to deoxidation pretreatment under a hydrogen atmosphere at 400°C±50°C; then, the above-mentioned deoxidation pretreated WC+Ni 3 The mixed powder of Al was pre-wet-milled and mixed for 6 hours, then the remaining amount of Co powder (3.57%) was added and then wet-milled for 18 hou...

Embodiment 2

[0017] Embodiment 2: According to figure 1 The flow shown, press Ni 25 The composition ratio of Al, the mass percentage is 2.59% nickel powder and aluminum powder, mixes evenly with the rest WC powder; Place the above-mentioned mixed powder in the graphite container and pave the thickness of 50 mm, under the non-oxidizing atmosphere, with 5 The heating rate of ℃ / min is heated to 1100 ℃, kept for 7 hours, and then cooled naturally to obtain WC and nickel-aluminum intermetallic compound Ni 3 A mixture of Al; the mixture is ground, crushed, and passed through a 120-mesh sieve to obtain WC+Ni with a particle size of 120 μm or less 3 Mixed powder of Al; the above WC+Ni3 The mixed powder of Al was subjected to deoxidation pretreatment under a hydrogen atmosphere at 400°C±50°C; then, the WC+Ni 3 The mixed powder of Al was pre-wet-milled and mixed for 6 hours, then the remaining amount of Co powder (2.98%) was added and then wet-milled for 27 hours to obtain a wet-milled mixture; th...

Embodiment 3

[0018] Embodiment 3: According to figure 1 The flow shown, press Ni 25 The composition ratio of Al, the mass percentage is 3.08% nickel powder and aluminum powder, and the WC powder of the balance is mixed evenly; The above-mentioned mixed powder is placed in the graphite container and paved with a thickness of 50 mm. The heating rate of ℃ / min is heated to 1100 ℃, kept for 7 hours, and then cooled naturally to obtain WC and nickel-aluminum intermetallic compound Ni 3 A mixture of Al; the mixture is ground, crushed, and passed through a 120-mesh sieve to obtain WC+Ni with a particle size of 120 μm or less 3 Mixed powder of Al; the above WC+Ni 3 The mixed powder of Al was subjected to deoxidation pretreatment under a hydrogen atmosphere at 400°C±50°C; then, the above-mentioned deoxidation pretreated WC+Ni 3 The mixed powder of Al was pre-wet-milled and mixed for 6 hours, then the remaining amount of Co powder (2.38%) was added and then wet-milled for 36 hours to obtain a wet-...

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Abstract

The invention discloses a toughness-enhanced hard alloy with a Co binding phase enhanced by Ni3Al. The hard phase of the hard alloy is WC, and the binding phase is Co and Ni3Al of which the volume percent is 10-40%. The preparation method of the hard alloy comprises the following sequential steps of: uniformly mixing 2.07-16.05wt% of Ni powder and Al powder with WC powder according to a composition ratio of Ni25Al; placing the uniformly mixed powder in a graphite container at the thickness not more than 50 mm, heating to 1100-1200 DEG C in a non-oxidative atmosphere at a speed not more than 5DEG C/min, maintaining the temperature for more than 1 hour, and naturally cooling to obtain a mixture of WC and Ni3Al; grinding, pulverizing and screening to obtain mixed powder with a particle sizebelow 120 mu m; carrying out deoxidation pretreatment in 400+/-50 DEG C hydrogen; carrying out pre-wet-grinding and mixing on 83.26-97.62wt% of mixed powder obtained after deoxidation pretreatment for 6-12 hours, then adding the balance of Co powder, and carrying out wet grinding for 18-36 hours; carrying out spray drying and pressure shaping on the wet-ground mixed material; and carrying out low-pressure liquid-phase sintering on the pressed blank at 1350-1550 DEG C to obtain the WC-Co hard alloy with the binding phase enhanced by Ni3Al. The hard alloy has the advantages that: a gamma' phaseis dispersed and distributed in the binding phase, the binding phase is uniformly distributed, and the alloy has high compactness, high strength, good wear resistance and excellent high-temperature oxidation resistance and corrosion resistance.

Description

technical field [0001] The invention relates to a cemented carbide material and a preparation method thereof, in particular to a cemented carbide material with WC as a matrix, Ni 3 Toughened and enhanced cemented carbide with Al strengthened Co binder phase and its preparation method. Background technique [0002] WC cemented carbide is widely used as cutting tools, mining tools and wear-resistant parts due to its high strength, high hardness, high wear resistance and high red hardness. The existing WC cemented carbide materials are mainly composed of matrix WC and binder phase Co metal. Due to the good wettability of Co to WC, the comprehensive mechanical properties at room temperature are good, but Co is a strategic resource, the price is relatively expensive, and its high-temperature wear resistance, high-temperature oxidation resistance and corrosion resistance are relatively low. This limits the application of WC cemented carbide with Co as the binder phase. The inte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/08C22C1/04
Inventor 龙坚战陆必志张忠健徐涛魏修宇
Owner ZHUZHOU HARD ALLOY GRP CO LTD
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