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A kind of steel-bonded hard alloy and preparation method thereof

A steel-bonded hard alloy and alloy technology, applied in the field of powder metallurgy, can solve problems such as insufficient strength and poor wettability of Fe, and achieve the effects of increasing hardness and strength, eliminating stress, and high hardness

Active Publication Date: 2017-10-20
LUOYANG GOLDEN EGRET GEOTOOLS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the existing research, Fe and Ni are the binder phase metals that have been studied more and successfully applied. However, due to the poor wettability of Fe, there are often pores in the cemented carbide products used as the binder phase, resulting in Insufficient strength

Method used

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  • A kind of steel-bonded hard alloy and preparation method thereof
  • A kind of steel-bonded hard alloy and preparation method thereof
  • A kind of steel-bonded hard alloy and preparation method thereof

Examples

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Effect test

preparation example Construction

[0025] The preparation process of the steel-bonded hard alloy includes steps such as batching-wet grinding-spray drying-press molding-sintering-heat treatment, specifically:

[0026] 1) The raw materials WC, Fe, Cr 3 C 2 , carbon black and additive WB are prepared according to a certain ratio, and the amount of carbon black added is calculated according to the phase diagram and the characteristics of the two-phase region, and the added amount is 0.1%-0.5% of the total amount of materials.

[0027] 2) Put all the materials into a 50L-300L tilting ball mill, put them into the ball milling balls according to the ratio of ball to material ratio of 2-5:1, add absolute ethanol as the grinding medium, and add the total mass of the ingredients (that is, WC, Fe, Cr 3 C 2 and the total mass of WB) 1%-4% paraffin as a molding agent, ball milled for 20-50 hours.

[0028] 3) Using an advanced spray drying system, under the action of high-temperature nitrogen at 160°C-240°C, the slurry ...

Embodiment 1

[0034] The weight percentage is 50% WC, 48.1% Fe, 1% Cr 3 C 2 , 0.3% carbon black, and 0.6% additive WB are batched according to the requirements, placed in a wet mill with a volume of 300L, and the ball-to-material ratio is controlled to be 3:1, with absolute ethanol as the ball milling medium, and 2% of the total mass of the ingredients is added Paraffin wax is used as a molding agent, ground for 36 hours, then unloaded, and spray-dried at a temperature of 200°C to obtain a mixed powder. Then, the mixed powder is pressed under a pressure of 125MPa to form a billet. Put it into a low-pressure furnace and sinter at 1240°C for 90 minutes to obtain an alloy body, and then place the alloy body in a vacuum heat treatment furnace for quenching at 1100°C and tempering at 170°C to obtain high hardness, high wear resistance and high toughness steel bonded carbide. The properties of the steel-bonded cemented carbide prepared in this example were tested, and the results are shown in T...

Embodiment 2

[0036] The weight percentage is 60% of WC, 34.3% of Fe, 0.5% of Cr 3 C 2, 0.2% of carbon black, 5% of additive WB are mixed according to the requirements, placed in a wet mill with a volume of 300L, the ball-to-material ratio is controlled at 2:1, absolute ethanol is used as the ball milling medium, and 1% of the total weight of the ingredients is added Paraffin wax is used as a molding agent, ground for 42 hours, then unloaded, and spray-dried at a temperature of 160°C to obtain a mixed powder. Then, the mixed powder is pressed under a pressure of 50 MPa to form a billet. Put it in a low-pressure furnace and sinter at 1300°C for 100 minutes to obtain an alloy body, and then place the alloy body in a vacuum heat treatment furnace for quenching at 1100°C and tempering at 170°C to obtain high hardness, high wear resistance and high strength and toughness steel bonded carbide. The properties of the steel-bonded cemented carbide prepared in this example were tested, and the resu...

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Abstract

A steel-bonded hard alloy, with WC as the hard phase and Fe as the binder phase, the weight percentage distribution ratio of each component in the alloy is: WC 40‑80%, Fe 15%‑55%, Cr3C2 0.5%‑ 4%, carbon black 0.1%‑0.5% and WB 0.5%‑5%. The preparation method includes batching-wet grinding-spray drying-compression molding-sintering-heat treatment and the like. The prepared cemented carbide has low porosity, excellent wear resistance, corrosion resistance, impact resistance and high strength and toughness. The bending strength can reach more than 4000N / mm2, which exceeds 10% of cemented carbide with the same binder phase content in some application fields. %‑30%. The raw materials required by the alloy of the present invention are cost-effective, and the preparation method meets the requirements of industrial mass production, which greatly expands the application scope of steel-bonded hard alloys, and can meet the wear resistance and toughness requirements of mold materials, wear-resistant parts and mining tools, etc. Both are used in high industrial fields.

Description

technical field [0001] The invention relates to the technical field of powder metallurgy, in particular to a steel-bonded hard alloy and a preparation method thereof. Background technique [0002] Steel-bonded cemented carbide is a material between cemented carbide and steel, and is usually prepared by traditional powder metallurgy. As a cross material, it combines the properties of steel and cemented carbide and fills the gap between them. Compared with traditional hard alloys, steel-bonded hard alloys have the characteristics of steel, with forgeability, machinability, and heat treatability. The above characteristics make steel-bonded hard alloy products widely used in mold materials and wear-resistant parts And mining tools and other fields. [0003] Most of the existing cemented carbides with high wear resistance and high hardness use WC and Co as raw materials. As a strategic resource and a rare metal, cobalt is basically imported, and its reserves are limited, and i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C29/08C22C1/05C22C33/02C22C38/00B22F3/14B22F3/24
CPCC22C1/051C22C29/005C22C29/08C22C33/006C22C33/02C22C38/00B22F3/14B22F3/24B22F2998/10B22F2003/248B22F1/10B22F3/02
Inventor 谢屹峰杨跃石玉斌程鑫焦长礼张宝林
Owner LUOYANG GOLDEN EGRET GEOTOOLS
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