Hard alloy taking nickel-aluminium intermetallic compound Ni3Al as binding phase and preparation method

A technology of intermetallic compounds and hard alloys, which is applied in the field of hard alloys toughened and reinforced by rare earth elements, can solve the problems of additive preparation methods, complicated processes, and poor stability of Co-Y, and achieve improved high-temperature oxidation resistance and easy The effect of low decomposition and manufacturing cost

Active Publication Date: 2011-08-17
ZHUZHOU HARD ALLOY GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The rare earth additive is used in cemented carbide products. Although the durability is increased by 30%-50%, the preparation method and process of the additive are complicated, and the stability of Co-Y is poor.

Method used

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  • Hard alloy taking nickel-aluminium intermetallic compound Ni3Al as binding phase and preparation method
  • Hard alloy taking nickel-aluminium intermetallic compound Ni3Al as binding phase and preparation method
  • Hard alloy taking nickel-aluminium intermetallic compound Ni3Al as binding phase and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1: According to figure 1 The flow shown, press Ni 24 The composition ratio of Al, the mass percentage is 5.04% nickel powder and aluminum powder, mixes evenly with the rest of the tungsten carbide powder; Place the above-mentioned mixed powder in a graphite container to pave the thickness of 50mm, 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 tungsten carbide and nickel-aluminum intermetallic compound Ni 3 A mixture of Al; the mixture is ground, crushed, and passed through a 250-mesh sieve to obtain tungsten carbide and nickel-aluminum intermetallic compound Ni with a particle size of 58 μm or less. 3 Mixed powder of Al; the above-mentioned tungsten carbide and nickel-aluminum intermetallic compound Ni 3 The mixed powder of Al is subjected to deoxidation pretreatment under a hydrogen atmosphere at 400°C±50°C; then, according to the amount of Y in the final ceme...

Embodiment 2

[0026] Embodiment 2: According to figure 1 The flow shown, press Ni 24 The composition ratio of Al, the mass percentage is 10.67% nickel powder and aluminum powder, mixes evenly with the remainder tungsten carbide powder; Place the above-mentioned mixed powder in a graphite container to pave a thickness of 30mm, under a non-oxidizing atmosphere, with 3 The heating rate of ℃ / min is heated to 1130℃, kept for 5 hours, and then cooled naturally to obtain tungsten carbide and nickel-aluminum intermetallic compound Ni 3 A mixture of Al; the mixture is ground, crushed, and passed through a 200-mesh sieve to obtain tungsten carbide and nickel-aluminum intermetallic compound Ni with a particle size of less than 75 μm 3 Mixed powder of Al; the above-mentioned tungsten carbide and nickel-aluminum intermetallic compound Ni 3 The mixed powder of Al is subjected to deoxidation pretreatment under a hydrogen atmosphere at 400°C±50°C; then, according to the amount of Y in the final cemented...

Embodiment 3

[0027] Embodiment 3: According to figure 1 The flow shown, press Ni 24 The composition ratio of Al, the mass percentage is 16.99% nickel powder and aluminum powder, mix with the balance tungsten carbide powder evenly; Place the above-mentioned mixed powder in a graphite container and spread it to a thickness of 20mm. Under a non-oxidizing atmosphere, use 1 Heating rate of ℃ / min to 1160 ℃, holding temperature for 3 hours, then cooling naturally to obtain tungsten carbide and nickel-aluminum intermetallic compound Ni 3 A mixture of Al; the mixture is ground, crushed, and passed through a 160-mesh sieve to obtain tungsten carbide and nickel-aluminum intermetallic compound Ni with a particle size of 96 μm or less. 3 Mixed powder of Al; the above-mentioned tungsten carbide and nickel-aluminum intermetallic compound Ni 3 The mixed powder of Al is subjected to deoxidation pretreatment under a hydrogen atmosphere at 400°C±50°C; then, according to the amount of Y in the final cement...

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Abstract

The invention discloses a hard alloy taking Ni3Al as a binding phase and carbide as a hard phase, wherein Y is 0.005 to 0.050wt%, the volume percent of the binding phase is 10 to 40%; a preparation method for the hard alloy sequentially comprises the following steps of: uniformly mixing 5.04 to 50.30 wt% of nickel powder and aluminium powder and the rest of carbide powder according to a proportion of components of Ni24Al; putting and spreading out the mixture in a graphite container to lead the thickness of the mixture to be less than or equal to 50mm, heating the graphite container at a speed of less than or equal to 5 DEG C / min to a temperature of 1100 DEG C to 1200 DEG C at a non-oxidizing atmosphere, preserving heat for more than 1 hour, naturally cooling so as to obtain a mixture ofcarbide and Ni3Al; milling, crushing and sieving the mixture so as to obtain a mixture powder of carbide and Ni3Al with the thickness of below120 micrometers; carrying out deoxidization pretreatment on the mixture powder; then adding anhydrous yttrium nitrate alcoholic solution into the mixed powder pretreated through deoxidization according to 0.0050% to 0.0503% (mass percentage) of Y in the final hard alloy for wet-milling mixing for 18 to 36 hours so as to obtain a mixture; making the mixture into green compacts; and finally carrying out the low pressure liquid phase sintering on the greencompacts under a temperature of 1350 DEG C to 1550 DEG C so as to obtain the hard alloy. The hard alloy has a uniform organization structure, high compacting, high strength, good toughness and abrasive resistance and excellent high-temperature oxidation resistance and corrosion resistance; and the process is simple and has low cost.

Description

technical field [0001] The invention relates to a cemented carbide material and a preparation method thereof, in particular to a cemented carbide prepared by powder metallurgy technology with carbide as the matrix, nickel-aluminum intermetallic compound as the binder phase, and toughened and reinforced by rare earth elements and its methods. Background technique [0002] Tungsten carbide 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 tungsten carbide cemented carbide materials are mainly composed of matrix tungsten carbide and binder phase cobalt metal. Due to the good wettability of cobalt to tungsten carbide, the comprehensive mechanical properties at room temperature are good, but cobalt is a strategic resource, the price is relatively expensive, and its high-temperature wear resistance, high-temperature oxidation resistance and corro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/06C22C1/05
Inventor 龙坚战陆必志袁军文魏修宇李仁琼
Owner ZHUZHOU HARD ALLOY GRP CO LTD
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