High-toughness ultra-wear-resistant hard alloy and manufacturing method thereof

A technology of cemented carbide and manufacturing method, applied in the field of cemented carbide, can solve the problems of poor toughness, limitation of cemented carbide, etc., and achieve the effect of improving wear resistance, improving wear resistance and toughness, and making up for the reduction of toughness

Inactive Publication Date: 2015-09-16
HEYUAN ZHENGXIN HARDMETAL CARBIDE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the higher the hardness of traditional cemented carbide, the worse its toughness, which limits the application of cemented carbide.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The ingredients are 83.8% ultra-fine grain WC powder with HCP value of 39.5KA / m, 3.0% by weight of ultra-fine Co powder, 1.0% by weight of VC and 4.0% by weight of Co powder. (Ta,Nb)C, 7.0% by weight B 4 C, the carbonyl Ni powder that is 0.7% by weight, the Mo that 0.5% by weight 2 C, the control carbon balance value is 0.21%. Use alcohol as the ball milling medium, the liquid-solid ratio is 500ml / kg, the ball-to-material ratio is 4.6:1, ball mill for 96 hours, spray dry and granulate to obtain the mixture. Carburize at a low temperature of 1330°C for 0.5h, raise the temperature to 1420°C, pressurize at 5MPa, hold the pressure for 2h, and cool down to obtain the experimental sample. Its hardness HRA 94.5, bending strength 2600N / mm 2 , the average grain size of WC is 0.35 μm.

Embodiment 2

[0035] The ingredients are 80.2% ultra-fine grain WC powder with HCP value of 41.5KA / m, 5.0% by weight of ultra-fine Co powder, 0.6% by weight of VC, and 8.0% by weight of Co powder. (Ta,Nb)C, 5.0% by weight of B 4 C, the carbonyl Ni powder that is 0.4% by weight, the Mo that 0.8% by weight 2 C, the control carbon balance value is 0.17%. Use alcohol as the ball milling medium, the liquid-solid ratio is 500ml / kg, the ball-to-material ratio is 4.6:1, ball mill for 96 hours, spray dry and granulate to obtain the mixture. Carburize at 1350°C for 2 hours at low temperature, raise the temperature to 1400°C, pressurize at 10MPa, hold the pressure for 0.5h, and cool down to get the test sample. Its hardness HRA 93.5, bending strength 3200N / mm 2 , the average grain size of WC is 0.30 μm.

Embodiment 3

[0037] The ingredients are 82.9% ultra-fine grained WC powder with HCP value of 40.0KA / m, 3.5% by weight of ultra-fine Co powder, 0.9% by weight of VC, 5.0% by weight of Co (Ta,Nb)C, 6.5% by weight of B 4 C, the carbonyl Ni powder that is 0.8% by weight, the Mo that 0.4% by weight 2 C, the control carbon balance value is 0.20%. Use alcohol as the ball milling medium, the liquid-solid ratio is 500ml / kg, the ball-to-material ratio is 4.6:1, ball mill for 96 hours, spray dry and granulate to obtain the mixture. The temperature was raised to 1335°C for low-temperature carburization for 1 hour, the temperature was raised to 1415°C, the air pressure was 6.5 MPa, the pressure was maintained for 1 hour, and the experimental samples were obtained after depressurization and cooling. Its hardness HRA 94.3, bending strength 2700N / mm 2 , the average grain size of WC is 0.40 μm.

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Abstract

The invention discloses a high-toughness ultra-wear-resistant hard alloy and a manufacturing method thereof. The high-toughness ultra-wear-resistant hard alloy comprises the following raw materials in percentage by mass: 3.0-5.0% of Co, 0.6-1.0% of VC, 4.0-8.0% of (Ta, Nb) C, 5.0-7.0% of B4C, 0.4-0.8% of carbonyl Ni, 0.4-0.8% of Mo2C and the balance of WC; moreover, the carbon balance value of the proportioning is +0.17 to +0.21%. The manufacturing method comprises the procedures of proportioning, ball-milling, drying-granulating, shaping, and low-temperature carburizing-low-pressure sintering. The method provided by the invention is used for manufacturing the cutting tools of indexable inserts, end mills, micro-drills, glass knives and the like, and is suitable for cutting machining for the many materials of cast iron, carbon steel, alloy steel, stainless steel, glass, ceramics and the like. The method can be further used for manufacturing hard alloy wear-resistant parts, sealing parts, precise moulds, high-pressure nozzles and the like, and can improve the wear resistance and the toughness of the prepared hard alloys, prolong the service lives of the tools and increase the production efficiency.

Description

technical field [0001] The invention relates to a hard alloy, in particular to a strong toughness super wear-resistant hard alloy and a manufacturing method thereof. Background technique [0002] Cemented carbide is a hard material formed by high-temperature liquid phase sintering with WC, TiC or the composite carbide formed by the two as the hard phase, with Co, Mo, and Ni as the binder phase. Molds and wear-resistant parts are widely used in machinery, metallurgy, mining, petroleum, electronics and other industries. Because of their high hardness, wear resistance, heat resistance, corrosion resistance and relatively stable chemical properties, they are used as Called "industrial teeth". With the rapid development of modern industry, people put forward higher and higher requirements for the performance of cemented carbide. However, the higher the hardness of traditional cemented carbide, the worse its toughness, which limits the application of cemented carbide to a certai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/08C22C1/05C22C1/10
Inventor 叶惠明叶少良诸优明
Owner HEYUAN ZHENGXIN HARDMETAL CARBIDE
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