Method for preparing superfine hard alloy

A cemented carbide, press forming technology, applied in the field of ultrafine cemented carbide preparation, can solve problems such as difficulty in adapting to the requirements of the development of the electronics industry

Inactive Publication Date: 2005-06-22
ZHUZHOU HARD ALLOY GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, domestic cemented carbide materials can generally only manufacture PCB micro-drills of 0.8mm or more, which is difficult to meet the requirements of the development of the electronics industry.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0006] Example 1: Co powder with a Fischer particle size of 0.75 μm is selected as 8.0% by weight, 1.2 μm VC is 0.29% by weight, and 1.2 μm Cr is selected for batching. 3 C 2 The weight percentage is 0.34%, the weight percentage of 1.2μm TaC is 0.34%, the HCP value is 39.3KA / m, the remaining WC powder, the carbon balance value is controlled +0.27%, alcohol is used as the grinding medium, the liquid-solid ratio is 450ml / Kg, and the ball material Ratio 5.45:1, ball milled for 85 hours, spray-dried to obtain the mixture, after molding, sintered in a gas pressure sintering furnace at 1410°C, the roughly ground Φ3.25×38.5mm rod, its HV 3 : 1950, bending strength 4130N / mm 2 , WC average grain size is 0.35μm.

Embodiment 2

[0007] Example 2: Co powder with a Fischer particle size of 0.5 μm is selected as 7.8% by weight, 1.2 μm VC is 0.30% by weight, and 1.2 μm Cr is selected for batching. 3 C 2 The weight percentage is 0.35%, the weight percentage of 1.2μm TaC is 0.35%, the HCP value is 41KA / m, the remaining WC powder, the carbon balance value is controlled +0.28%, alcohol is used as the grinding medium, the liquid-solid ratio is 450ml / Kg, the ball-to-material ratio 5.45:1, ball milled for 80 hours, and spray-dried to obtain the mixture. After molding, it was sintered in a pressure sintering furnace at 1410°C. After rough grinding, the Φ3.25×38.5mm rod, its HV 3 : 1980, bending strength 3830N / mm 2 , WC average grain size is 0.30μm.

Embodiment 3

[0008] Example 3: The weight percent of Co powder with a Fischer particle size of 0.98 μm is 8.2%, the weight percent of 1.2 μm VC is 0.28%, and the weight percentage of 1.2 μm Cr is selected for batching. 3 C 2 The weight percentage is 0.35%, the weight percentage of 1.2μm TaC is 0.32%, the HCP value is 38.0KA / m, the remaining WC powder, the carbon balance value is controlled +0.26%, alcohol is used as the grinding medium, the liquid-solid ratio is 450ml / Kg, and the ball material Ratio 5.45:1, ball milled for 85 hours, spray-dried to obtain the mixture, after molding, sintered in a gas pressure sintering furnace at 1410°C, the roughly ground Φ3.25×38.5mm rod, its HV 3 : 1910, bending strength 4310N / mm 2 , the average grain size of WC is 0.4 μm.

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Abstract

The invention relates to a preparation method of ultrafine cemented carbide for manufacturing micro-drills, comprising: batching, wet grinding, drying, pressing and sintering processes, and the selected HCP value is (38-41)KA / m when batching WC powder and Co powder with a weight percentage of 7.8% to 8.2%, and VC with a weight percentage of 0.28% to 0.30%, 0.31% to 0.35% TaC, and 0.31% to 0.35% Cr 3 C 2 , VC, TaC and Cr 3 C 2 The total weight percentage is 0.95%~1.0%. When calculating the ingredients, the carbon balance value is (+0.26~+0.28)%, and the average grain size of WC in the cemented carbide reaches (0.3~0.4)μm. Using the above preparation method, the hardness of the prepared cemented carbide can reach HV 3 : 1900 ~ 1980, and the minimum diameter of the PCB micro-drill made of this kind of ultra-fine cemented carbide can be as small as 0.3mm.

Description

Technical field: [0001] The invention relates to a preparation method of ultrafine hard alloy, in particular to a preparation method of WC-Co ultrafine hard alloy used for manufacturing micro drills. Background technique: [0002] Cemented carbide can be used to manufacture PCB micro-drills due to its high hardness and high strength. With the rapid development of the electronics industry, PCB micro-drills with smaller drill diameters are required. At present, domestic cemented carbide materials can generally only manufacture PCB micro-drills with a diameter of 0.8 mm or more, which is difficult to meet the requirements of the development of the electronics industry. Invention content: [0003] The purpose of the present invention is to provide a kind of preparation method of superfine cemented carbide, the cemented carbide that makes with this method can be used for making the microdrill below 0.8mm of drill diameter. [0004] In order to achieve the above object, the pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/04C22C29/08
Inventor 李来荣刘知径
Owner ZHUZHOU HARD ALLOY GRP CO LTD
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