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Preparing method for ultra-fine hard alloy

A cemented carbide and inhibitor technology, applied in the field of powder metallurgy, can solve the problems of high production cost and complicated process, and achieve the effects of long service life, simple process and low cost

Inactive Publication Date: 2016-07-06
ZHUZHOU HARD ALLOY GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is complicated in technology and high in industrialized production cost

Method used

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  • Preparing method for ultra-fine hard alloy
  • Preparing method for ultra-fine hard alloy
  • Preparing method for ultra-fine hard alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A high-performance ultra-fine cemented carbide A for processing cast iron, common steel and titanium alloys, the weight percentage of the alloy is: 10% of Co powder with Fsss particle size of 1.41 μm, and WC with Fsss particle size (BET) of 0.35 μm Powder 89.5%, Cr with Fsss particle size 1.5μm 3 C 2 Inhibitor 0.5%.

[0031] After cleaning the ball mill and the hard alloy baseball, add Cr 3 C 2 Inhibitor, all Co powder and some alcohol, the amount of alcohol added is 120ml / 100g Co powder, pre-dispersed for 2h. After the pre-dispersion, WC powder with Fsss particle size (BET) of 0.35 μm was added, and the corresponding alcohol was added. The final liquid-solid ratio was 320ml / Kg, the ball-material ratio was 4.3:1, and the ball milling time was 35h. After wet grinding, it is spray-dried and pressed into shape. The pressed green compact was sintered at 1440°C under a pressure of 50 bar and held for 1 hour to obtain the final alloy. The metallographic structure of the...

Embodiment 2

[0033] A high-performance ultra-fine hard alloy B is used for processing cast iron and stainless steel. The weight percentage of the alloy is: 10.5% of Co powder with Fsss particle size of 1.41 μm, 88.85% of WC powder with Fsss particle size (BET) of 0.35 μm, Cr with an Fsss particle size of 1.5 μm 3 C 2 Inhibitor 0.65%.

[0034] After cleaning the ball mill cylinder and hard alloy baseball, add Cr 3 C 2 Inhibitor, all Co powder and some alcohol, the amount of alcohol added is 140ml / 100g Co powder, pre-dispersed for 2h. After the pre-dispersion, WC powder with Fsss particle size (BET) of 0.35 μm was added, and the corresponding alcohol was added. The final liquid-solid ratio was 350ml / Kg, the ball-to-material ratio was 4.5:1, and the ball milling time was 40h. After wet grinding, it is spray-dried and pressed into shape. The pressed green compact was sintered at 1440°C under a pressure of 50 bar and held for 1 hour to obtain the final alloy. The metallographic structure ...

Embodiment 3

[0036] A high-performance ultra-fine cemented carbide C is used for processing cast iron and stainless steel. The weight percentage of the alloy is: 10% of Co powder with Fsss particle size of 1.41 μm, 89.2% of WC powder with Fsss particle size (BET) of 0.25 μm, Cr with an Fsss particle size of 1.5 μm 3 C 2 Inhibitor 0.3%, TaC inhibitor with Fsss particle size 1.5 μm 0.5%.

[0037] After cleaning the ball mill cylinder and hard alloy baseball, add Cr 3 C 2And TaC inhibitor, all Co powder and some alcohol, the amount of alcohol added is 150ml / 100g Co powder, pre-dispersed for 3h. After the pre-dispersion, WC powder with Fsss particle size (BET) of 0.25 μm was added, and the corresponding alcohol was added. The final liquid-solid ratio was 375ml / Kg, the ball-material ratio was 4.8:1, and the ball milling time was 45h. After wet grinding, it is spray-dried and pressed into shape. The pressed compact was sintered at 1460° C. under a pressure of 50 bar and held for 1 hour to o...

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Abstract

The invention relates to a preparing method for an ultra-fine hard alloy. The preparing method comprises the steps of inhibitor pre-dispersing, burdening, wet grinding, drying, pressing and sintering. According to inhibitor pre-dispersing, an inhibitor and all Co powder are subjected to ball milling and mixing treatment, ultra-fine WC is added to be subjected to burdening after inhibitor pre-dispersing, and the purpose of even dispersing of the inhibitor in a mixture is achieved. The preparing method is simple in technology and low in cost, and the prepared hard alloy is even in microstructure and high in comprehensive performance.

Description

technical field [0001] The invention belongs to the field of powder metallurgy, relates to a production method of cemented carbide, in particular to a WC-Co ultrafine cemented carbide and a preparation method thereof. Background technique [0002] Compared with the traditional WC-Co cemented carbide, ultra-fine cemented carbide has the "double high" performance of high strength and high hardness, which meets the development of modern industry and special difficult-to-machine materials. Therefore, it has been the international hard alloy in the past 10 years The focus of alloy academic and industry research. [0003] However, in order to prepare ultra-fine cemented carbide, it is necessary for the WC raw powder to reach the ultra-fine level, which has a large specific surface area, high activity, and a large driving force for grain growth, and it is very easy to grow during the sintering process. Among the many methods of inhibiting WC grain growth, adding grain growth inhib...

Claims

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Application Information

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IPC IPC(8): C22C1/05C22C29/08B22F9/04
CPCC22C1/051C22C29/08B22F9/04B22F2998/10B22F2009/043B22F2009/042B22F1/0003B22F1/14B22F2003/145B22F3/02
Inventor 尹超任跃赵玉玲
Owner ZHUZHOU HARD ALLOY GRP CO LTD
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