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Hard alloy using nickel-aluminum intermetallic compound Ni3Al as bonding phase and preparation method thereof

An intermetallic compound and cemented carbide technology, which is applied in the field of cemented carbide materials and their preparation, can solve the problem of easy generation of pores in alloys, and achieve the effects of improving room temperature plasticity and toughness, uniform structure and composition.

Active Publication Date: 2011-08-03
ZHUZHOU HARD ALLOY GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this liquid phase sintering method has the characteristics of simple operation and easy realization of industrial production, it is easy to generate pores in the alloy, and "Ni 3 Al metal pool"

Method used

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  • Hard alloy using nickel-aluminum intermetallic compound Ni3Al as bonding phase and preparation method thereof
  • Hard alloy using nickel-aluminum intermetallic compound Ni3Al as bonding phase and preparation method thereof
  • Hard alloy using nickel-aluminum intermetallic compound Ni3Al as bonding phase and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 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 3The mixed powder of Al is subjected to deoxidation pretreatment in a hydrogen atmosphere at 400°C±50°C; then, the B powder with a mass percentage of 0.0025% and ...

Embodiment 2

[0021] Embodiment 2: According to figure 1 The flow shown, press Ni 24 The composition ratio of Al, the mass percentage is 10.67% iron powder and aluminum powder, mixes evenly with the remainder tungsten carbide powder; Place the above-mentioned mixed powder in a graphite container to pave the thickness of 30mm, under 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, the B powder with a mass percentage of 0.0053% and th...

Embodiment 3

[0022] Embodiment 3: According to figure 1 The flow shown, press Ni 24 The composition ratio of Al, the mass percentage is 16.99% iron powder and aluminum powder, mix with the remainder tungsten carbide powder evenly; Place the above-mentioned mixed powder in a graphite container to pave the thickness of 20mm, under the non-oxidizing atmosphere, with 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 in a hydrogen atmosphere at 400°C±50°C; then, the B powder with a mass percentage of 0.0085% and the b...

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Abstract

The invention discloses a hard alloy using a nickel-aluminum intermetallic compound Ni3Al as a bonding phase and a preparation method thereof. The hard alloy comprises a hard phase and the bonding phase, and also comprises 0.0025-0.0252 percent by mass of elements B; and the volume percentage of the bonding phase is 10-40. The preparation method sequentially comprises the following steps of: uniformly mixing 5.04-50.30 percent by weight of nickel powder, aluminum powder and the balance of carbide powder according to the component proportion of Ni24Al; arranging the mixture in a graphite container, flattening the mixture with the thickness being smaller than or equal to 50 millimeters, and heating the mixture to 1100-1200 DEG C at a speed smaller than or equal to 5 DEG C per minute in a non-oxide atmosphere, preserving heat for 1 hour, cooling the mixture naturally to obtain a mixture of the carbide and Ni3Al; adding 0.0025-0.0252 percent by weight of powder B, mixing the mixture with the powder B by using a wet grinding method for 18-36 hours; preparing the mixed material into green compacts; carrying out low-voltage liquid-phase sintering at 1350-1550 DEG C to obtain the hard alloy using Ni3Al as the bonding phase, wherein the hard alloy has a uniform organization structure, high compactness of alloy, high strength, good wear resistance and excellent high-temperature oxidation resistance and corrosion resistance. The hard alloy has a simple process and low manufacturing cost.

Description

technical field [0001] The invention relates to a cemented carbide material and a preparation method thereof, in particular to a toughened and reinforced cemented carbide with carbide as the matrix and nickel-aluminum intermetallic compound as the binder phase prepared by powder metallurgy technology and its preparation method. method. 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 corrosion r...

Claims

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Application Information

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IPC IPC(8): C22C29/06C22C1/05
Inventor 龙坚战陆必武魏修宇方晴余怀民李勇卢少武管玉明蒋洪亮
Owner ZHUZHOU HARD ALLOY GRP CO LTD
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