Preparation method of hard alloy using nickel-aluminum intermetallic compound Ni3Al as bonding phase

A technology of intermetallic compounds and cemented carbide, which is applied in the field of cemented carbide materials and its preparation, can solve problems such as the alloy is prone to produce pores, and achieve the effects of improving plasticity and toughness at room temperature, uniform structure, and fine particle size

Active Publication Date: 2012-12-19
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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  • Preparation method of hard alloy using nickel-aluminum intermetallic compound Ni3Al as bonding phase
  • Preparation method of hard alloy using nickel-aluminum intermetallic compound Ni3Al as bonding phase

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: According to figure 1 In the process shown, according to the composition ratio of Ni-24at.%Al, mix the nickel powder and aluminum powder with a mass percentage of 5.04% and the rest of the tungsten carbide powder evenly; place the above mixed powder in a graphite container and spread it to a thickness of 50mm , in a non-oxidizing atmosphere, heated to 1100°C at a heating rate of 5°C / min, held 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%...

Embodiment 2

[0021] Embodiment 2: According to figure 1 In the process shown, according to the composition ratio of Ni-24at.%Al, the mass percentage of 10.67% nickel powder and aluminum powder is mixed with the remaining tungsten carbide powder; , in a non-oxidizing atmosphere, heated to 1130 °C at a heating rate of 3 °C / min, 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 the balance of the above-mentioned tungsten carbide and nickel-aluminum intermetallic c...

Embodiment 3

[0022] Embodiment 3: According to figure 1 In the process shown, according to the composition ratio of Ni-24at.%Al, the mass percentage of 16.99% nickel powder and aluminum powder is mixed evenly with the remaining tungsten carbide powder; the above mixed powder is placed in a graphite container and paved with a thickness of 20mm , in a non-oxidizing atmosphere, heated to 1160 °C at a heating rate of 1 °C / min, kept for 3 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 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 0.00...

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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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Patent Type & Authority Patents(China)
IPC IPC(8): C22C29/06C22C1/05
Inventor 龙坚战陆必志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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