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

A technology of cemented carbide and aluminum metal, applied in the field of cemented carbide materials and its preparation, can solve the problems of coarse powder, low mechanical properties of alloy at room temperature, and easy brittle fracture, etc., and achieve uniform composition, simple preparation method and low cost low effect

Active Publication Date: 2011-03-16
ZHUZHOU HARD ALLOY GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the intermetallic compound powder is prepared by the method of smelting according to a certain composition ratio and then atomized into powder by inert gas, the prepared powder is often relatively coarse, which is likely to cause uneven microstructure in the alloy.
At the same time, the inherent brittleness of intermetallic compounds makes the alloy's mechanical properties at room temperature low and prone to brittle fracture.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Embodiment 1: press the composition of iron-aluminum intermetallic compound FeAl, the iron-aluminum intermetallic compound Fe that mass percentage is 1.69% 2 al 5 The pre-alloyed powder and 2.10% iron powder are ball milled and mixed with the remaining tungsten carbide powder for 18 hours to obtain a ball-milled mixture; the ball-milled mixture is prepared into a uniform mixture powder by spray drying, and then pressed into shape; the compact is sintered During the process, heat preservation at 1200°C±20°C for 1 hour under vacuum conditions, and then sinter at 1350°C in a low-pressure liquid phase to obtain a cemented carbide with iron-aluminum intermetallic compound FeAl as the binder phase, in which FeAl The volume percentage is 10%. The scanning electron microscope photo of the cemented carbide is shown in figure 1 , see Table 1 for details.

Embodiment 2

[0013] Embodiment 2: Press iron-aluminum intermetallic compound Fe 3 The composition of Al, the mass percentage is 1.31% iron-aluminum intermetallic compound Fe 2 al 5 The pre-alloyed powder and 3.23% iron powder are ball milled and mixed with the remaining tungsten carbide powder. Except that the low-pressure liquid phase sintering temperature is 1550 ° C, the rest of the process steps, conditions and parameters are the same as in Example 1. The obtained iron- — Aluminum intermetallic compound Fe 3 Al is the cemented carbide of the binder phase, where Fe 3 The volume percentage of Al is 10%. The scanning electron microscope photo of the cemented carbide is shown in figure 2 , see Table 1 for details.

Embodiment 3

[0014] Embodiment 3: press the composition of iron-aluminum intermetallic compound FeAl, the iron-aluminum intermetallic compound Fe that mass percent is 3.62% 2 al 5 The pre-alloyed powder and 4.51% iron powder are ball milled and mixed with the remaining tungsten carbide powder for 24 hours to obtain a ball-milled mixture; the ball-milled mixture is spray-dried to prepare a uniform mixture powder, and then pressed into shape; the compact is sintered During the process, heat preservation at 1200°C±20°C and vacuum for 1 hour, and then sinter at 1320°C in a low-pressure liquid phase to obtain a cemented carbide with iron-aluminum intermetallic compound FeAl as the binder phase, of which FeAl The volume percentage is 20%. The scanning electron microscope photo of the cemented carbide is shown in figure 1 , see Table 1 for details.

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Abstract

The invention discloses a hard alloy using an iron-aluminum intermetallic compound as a bonding phase and a preparation method thereof. The hard phase is carbide, and the bonding phase is 10 to 40 volume percent of FeAl or Fe3Al. The preparation method comprises the following steps of: ball-milling and mixing 1.69 to 19.09 mass percent or 1.31 to 13.75 mass percent of pre-alloying powder of Fe2Al5, 2.10 to 23.78 mass percent or 3.23 to 33.81 mass percent of iron powder and the balance of carbide powder based on the component of FeAl or Fe3Al for 18 to 36 hours, preparing the obtained ball-milling mixture into uniform mixture powder by spray drying, pressing the mixture powder to form a blank, preserving the heat for 1 to 2 hours at the temperature of 1,200 +/- 20 DEG C under the vacuum condition during sintering the pressed blank, and then performing low-pressure liquid phase sintering at the temperature of between 1,250 and 1,550 DEG C to obtain the hard alloy using the FeAl or the Fe3Al as the bonding phase, wherein the FeAl or the Fe3Al is 10 to 40 volume percent. The preparation method has simple process and is low in manufacturing cost; holes are difficult to form in the liquid phase sintering process or are small; and the obtained hard alloy has high strength, good abrasion resistance and excellent high-temperature oxidation resistance and sulfur corrosion resistance.

Description

technical field [0001] The invention relates to a hard alloy material and a preparation method thereof, in particular to a hard alloy with carbide as a matrix and iron-aluminum intermetallic compound as a binding phase and a method thereof prepared by powder metallurgy technology. 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, it has good comprehensive mechanical properties at room temperature. However, because cobalt is a strategic resource, its price is relatively expensive, and its high-temperature wear resistance, high-temperature oxidation resistance and corrosion resistance are relatively low. , which limits...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/08C22C29/10C22C1/04
Inventor 龙坚战魏修宇陆必志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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