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Hard alloy with iron-nickel as binder metal and preparation method thereof

A technology for bonding metals and hard alloys, applied in the field of hard alloys and their preparation, can solve problems such as shortages

Inactive Publication Date: 2013-04-03
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the deficiencies in the prior art, to provide a hard alloy with iron-nickel as bonding metal and its preparation method, aiming at effectively improving the bonding strength between bonding metal and carbide, and solving the problem of bonding The problem of insufficient metal strength can significantly improve the mechanical properties of cemented carbide and prolong the service life

Method used

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  • Hard alloy with iron-nickel as binder metal and preparation method thereof
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  • Hard alloy with iron-nickel as binder metal and preparation method thereof

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preparation example Construction

[0017] The preparation process of the cemented carbide with iron and nickel as the bonding metal is: firstly, WC powder and Fe-Ni alloy powder are wet-milled and mixed in a solvent. The solvent is alcohol, acetone, hexane, water or any combination of them. The mixture is then dried, shaped, and sintered.

[0018] Use WC as the hard phase and 3-20% (weight ratio) Fe-Ni as the binder metal. The bonding metal is Fe-Ni alloyed metal, Fe and Ni are mixed at the atomic level, in which Fe accounts for 50-80%, and Ni is 20-50%. Fe-Ni alloy powder has good wettability to WC under vacuum liquid conditions, and the phase composition is face-centered cubic austenite and martensite (among which austenite is 65% and martensite is 35%), It is beneficial to ensure that the alloy has high strength while also having high toughness. In order to make the Fe-Ni alloy powder and WC powder easy to mix uniformly, the Fe-Ni alloy powder is made into a spherical shape with a particle size figure 2 , It...

Embodiment

[0020] Ultrafine WC powder with a particle size of 1.0μm and Fe-Ni alloy powder with a particle size of 1.2μm are used (the morphology of the alloy powder is shown in the picture figure 1 ), according to the weight ratio WC: Fe-Ni = 9: 1 powder, the ball-to-battery ratio is 3.5:1, the grinding agent is alcohol, add 350ml per kilogram of powder, after 48 hours of ball milling, the powder is in Drying at a temperature of 120°C, the powder is mixed with forming agent after drying, and pressed into shape, and sintered at 1390°C for 60 minutes in a low-pressure (10MPa) sintering furnace integrated with mold release agent and sintering to make cemented carbide products.

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Abstract

The invention relates to hard alloy with iron-nickel as binder metal and a preparation method thereof. The binder metal powder is iron-nickel alloy powder; the iron-nickel alloy powder is spherical; the grain size is smaller than or equal to 4 microns; the iron-nickel alloy powder is prepared from 50-80% of iron element and 20-50% of nickel element; the alloy powder phase is composed of austenite and martensite; and the hard alloy comprises the following components in percentage by weight: 80-97% of WC powder, and 3-20% of Fe-Ni alloy powder. The preparation method comprises the steps of firstly, wetly grinding and mixing the WC powder and Fe-Ni alloy powder in a solvent in preparation, and then drying, molding and sintering. The hard alloy employing the iron-nickel alloy as the binder metal has better strength / toughness ratio, can be widely applied to the fields such as engineering geology and mining, compared with the traditional tungsten carbide-cobalt hard alloy; not only can application of strategic resource cobalt be reduced, but also the service life of a hard alloy tool can be prolonged.

Description

technical field [0001] The invention relates to a cemented carbide with iron-nickel as bonding metal and a preparation method thereof. The cemented carbide is used for manufacturing tools in fields such as rock drilling and geological drilling. Background technique [0002] Cemented carbide is a kind of composite material made of refractory metal hard compound (hard phase) and metal binder (bonding phase) by powder metallurgy. Since cobalt has good wettability to carbide and the alloy with carbide has high strength, it has been widely used as a bonding metal for cemented carbide since the advent of cemented carbide. However, due to the limited cobalt resources in the world, in addition, cobalt may be oxidized into toxic Co during the use of cemented carbide. 6+ , Potential threat to human health, therefore, finding and researching cobalt substitute materials has always been an important topic in the research and production of cemented carbide. Iron-nickel elements of the s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/08C22C1/05
Inventor 徐纯芳邹宇星李友军余立新
Owner SHAREATE TOOLS
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