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
CN101985718AActive Publication Date: 2011-03-16ZHUZHOU HARD ALLOY GRP CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
ZHUZHOU HARD ALLOY GRP CO LTD
Publication Date
2011-03-16

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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.
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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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