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Process for preparing ultra-fine cemented carbide

A cemented carbide and press-forming technology, which is applied in the field of preparation of WC-Co ultrafine cemented carbide, can solve the problems of low hardness and poor wear resistance of cemented carbide, and achieve improved machining accuracy, improved wear resistance, and use The effect of life extension

Active Publication Date: 2004-11-10
ZHUZHOU HARD ALLOY GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented method allows for creation of fine ceramic materials called Ultrapure Carbon (UC), where tiny crystals are dispersed throughout them instead of being surrounded entirely within each other like sandwiches or plates. These finer particles help prevent crack formation during machining processes while improving their durability over time. Additionally, this process helps increase the surface area on these materials compared to traditional methods such as milling without adding any metal catalysts. Overall, it provides technical benefits including longer lifetimes, higher precision levels, reduced damage from heat stress, enhanced performance capabilities, and improved productivity.

Problems solved by technology

The technical problem addressed in this patented text relates how to make strong but also easy for machining tools such as drill bits or mills that are resistant to wearing down quickly without losing their effectiveness over time when they come into contact with other objects during use.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0007] Embodiment 1: Select 6.0wt% Co powder, 0.44wt% Cr for use in batching 3 C 2 powder, 0.2wt% VC powder (Cr 3 C 2 : VC=2.2), the balance is WC powder, and its Fibonacci particle size is 0.7 μm; With alcohol as the ball milling medium, the liquid-solid ratio is 500ml / Kg, the ball-material ratio is 4.5: 1, and the ball milling time is 82 hours, after spraying The mixed material is obtained by drying, and after compression molding, it is placed in a low-pressure sintering furnace for sintering at 1380° C., and the sintering pressure is 5 MPa. With the bar material of Φ 3.25 * 38.5mm after rough grinding as the standard product (the following examples are the same) of the superfine cemented carbide prepared by the inspection method of the present invention, its WC average grain size is 0.40 μ m, and the flexural strength is 3800N / mm 2 , Hardness Hv 30 2000.

Embodiment 2

[0008] Embodiment 2: select the Co powder of 6.5wt% for use, the Cr of 0.8wt% during batching 3 C 2 powder, 0.5wt% VC powder (Cr 3 C 2 : VC=1.6). , the balance is WC powder, and its Fischer particle size is 0.7 μm; alcohol is used as the ball milling medium, the liquid-solid ratio is 500ml / Kg, the ball-to-material ratio is 5.2:1, the ball milling time is 87 hours, and the mixture is obtained by spray drying , After compression molding, it is placed in a low-pressure sintering furnace for sintering at 1410 ° C, and the sintering pressure is 5 MPa. The average WC grain size of the product is 0.25μm, and the bending strength is 3000N / mm 2 , Hardness Hv 30 2200.

Embodiment 3

[0009] Embodiment 3: Select 6.2wt% Co powder, 0.6wt% Cr for use in batching 3 C 2 powder, 0.4wt% VC powder (Cr 3 C 2 : VC=1.5), the remainder is WC powder, and its Fibonacci particle size is 0.34 μ m; With alcohol as ball milling medium, liquid-solid ratio is 500ml / Kg, and ball material ratio is 4.8: 1, ball milling time is 80 hours, through spraying The mixture was obtained by drying, and after compression molding, it was placed in a low-pressure sintering furnace for sintering at 1400° C., and the sintering pressure was 8 MPa. The average WC grain size of the product is 0.30μm, and the bending strength is 3400N / mm 2 , Hardness Hv 30 2150.

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Abstract

The invention discloses an ultrafine hard alloy preparing method, including the working procedures of batching, wet-grinding, drying, compression-molding and sintering; when batching, selecting ultrafine WC powder at Fischer particle size 0.3-0.7 mum, (5.5-7.0)wt% Co powder, (0.2-0.5)wt% VC powder, and (0.2-0.8)wt% Cr3C2 powder; adopting sintering at low pressure 5-10MPa; the optimum ratio of Cr3C2 to VC = 2.2-1.1. The average crystal particle size is down to (0.2-0.4)mum, and on the condition of bending strength basically not changing (3000-3800N/sq mm), the hardness is up to Hv30 2000-2200, thus largely enhancing wearability, and the made product has long service life and increased processing precision.

Description

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Claims

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Application Information

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Owner ZHUZHOU HARD ALLOY GRP CO LTD
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