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Hard alloy with iron-aluminum intermetallic compound as main binding phase and preparation method of hard alloy

A technology of cemented carbide and binder phase, which is applied in the field of cemented carbide materials and its preparation, can solve the problems of unsuitability for industrial production and complex operation, and achieve excellent high-temperature oxidation resistance and sulfur corrosion resistance. The preparation method Simple, evenly textured effect

Active Publication Date: 2011-07-27
ZHUZHOU HARD ALLOY GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are many factors affecting this method, such as ball mill type, time, medium, process control agent and other parameters, the operation is complicated, and it is not suitable for industrial production

Method used

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  • Hard alloy with iron-aluminum intermetallic compound as main binding phase and preparation method of hard alloy
  • Hard alloy with iron-aluminum intermetallic compound as main binding phase and preparation method of hard alloy
  • Hard alloy with iron-aluminum intermetallic compound as main binding phase and preparation method of hard alloy

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Embodiment 1: According to figure 1 Process shown, press Fe 40 For the composition ratio of Al, mix the iron powder and aluminum powder with a mass percentage of 1.94% and the balance of tungsten carbide powder evenly; place the above mixed powder in a graphite container and spread it to a thickness of 50 mm, and in a non-oxidizing atmosphere, at 10 ° C Heating to 900°C at a heating rate of / min, keeping it warm for 7 hours, and then cooling naturally to obtain a mixture of tungsten carbide and FeAl intermetallic compound; grind the mixture, crush it, and pass it through a 250-mesh sieve to obtain tungsten carbide with a particle size of 58 μm or less and the mixed powder of FeAl intermetallic compound; the mixed powder of the above-mentioned tungsten carbide and FeAl intermetallic compound is subjected to deoxygenation pretreatment under the hydrogen atmosphere of 400°C±50°C; then, the mass percentage is 3.00% cobalt powder and 0.23% Cr 3 C 2powder, and then wet-mil...

Embodiment 2

[0022] Embodiment 2: According to figure 1 Process shown, press Fe 28 For the composition ratio of Al, mix the iron powder and aluminum powder with a mass percentage of 2.34% and the rest of the tungsten carbide powder evenly; place the above mixed powder in a graphite container with a thickness of 50 mm, and in a non-oxidizing atmosphere, at 10 ° C / min heating rate to 900°C, heat preservation for 7 hours, and then natural cooling to obtain tungsten carbide and Fe 3 A mixture of Al intermetallic compounds; the mixture is ground, crushed, and passed through a 250-mesh sieve to obtain tungsten carbide and Fe with a particle size of 58 μm or less 3 Mixed powder of Al intermetallic compound; the above tungsten carbide and Fe 3 The mixed powder of Al intermetallic compound is subjected to deoxidation pretreatment in a hydrogen atmosphere at 400°C±50°C; then, the mass percentage is 3.00% of cobalt powder and 0.24% of Cr 3 C 2 powder, then with the balance of the above tungsten ...

Embodiment 3

[0023] Embodiment 3: According to figure 1 Process shown, press Fe 40 For the composition ratio of Al, mix the iron powder and aluminum powder with a mass percentage of 3.44% and the balance of tungsten carbide powder evenly; place the above mixed powder in a graphite container and spread it to a thickness of 50 mm, and in a non-oxidizing atmosphere, at 10 ° C Heating to 900°C at a heating rate of / min, keeping it warm for 7 hours, and then cooling naturally to obtain a mixture of tungsten carbide and FeAl intermetallic compound; grind the mixture, crush it, and pass it through a 250-mesh sieve to obtain tungsten carbide with a particle size of 58 μm or less and the mixed powder of FeAl intermetallic compound; the above mixed powder of tungsten carbide and FeAl intermetallic compound is subjected to deoxidation pretreatment under the hydrogen atmosphere of 400°C±50°C; then, the mass percentage is 0.61% of cobalt powder and 0.18% Cr 3 C 2 powder, and then wet-milled and mixe...

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Abstract

The invention discloses a hard alloy with an iron-aluminum intermetallic compound FeAl or Fe3Al as a main binding phase, cobalt as a secondary binding phase, and tungsten carbide and / or titanium carbide and Cr3C2 as a hard phase, and the preparation method of the hard alloy comprises the steps in sequence of: uniformly mixing iron powder and aluminum powder with WC and / or TiC powder based on the component ratio of Fe40Al or Fe28Al; under a non-oxidative atmosphere, heating, preserving heat and cooling to obtain a mixture of WC and / or TiC and FeAl or Fe3Al; grinding and crushing the mixture to obtain the mixed powder of WC and / or TiC and FeAl or Fe3Al with the grain size below 120 microns; carrying out deoxygenization pretreatment; wetly grinding and mixing cobalt powder and Cr3C2 powder having certain mass ratio with the balance of the mixture powder of WC and / or TiC and FeAl or Fe3Al; spray drying and compacting to obtain a green compact; and subjecting the green compact to liquid phase sintering at a low pressure to obtain the hard alloy with FeAl or Fe3Al as the main binding phase. The hard alloy disclosed by the invention has the advantages of uniform organizational structure, high densification, high intensity, good abrasive resistance, excellent high temperature oxidation resistance and sulfidation corrosion resistance, simple preparation 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 iron-aluminum intermetallic compound as the main binder phase prepared by powder metallurgy technology and its 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 resistance are rel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05C22C29/00C22C29/06
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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