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Prepn of hard W-Co alloy

A cemented carbide and tungsten-cobalt technology, which is applied in the field of preparation of tungsten-cobalt cemented carbide, can solve the problems of complex process, limited application range and high cost

Active Publication Date: 2004-04-07
ZHUZHOU HARD ALLOY GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the wear resistance and toughness of this type of alloy are usually a pair of contradictions: with the increase of Co content, the toughness is strengthened, while the wear resistance is getting lower and lower, and the two cannot be balanced.
Therefore, the scope of use of this alloy is limited, and it is generally suitable for rock formations with f = 13-16
With the continuous development of science and technology, although some ways to solve this contradiction have been found, such as: subsequent heat treatment of alloys, low-pressure sintering, gradient alloys, ultra-fine alloys, etc., these methods are either complicated in process or too high in cost. With a large number of applications in mining alloys

Method used

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  • Prepn of hard W-Co alloy

Examples

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Effect test

Embodiment 1

[0007] Example 1: Batch WC powder of two types of thickness and 9.5wt% Co powder according to certain requirements, unload after wet grinding for 20-23 hours, settle for 5-8 hours, dry and vibrate, granulate with forming agent, and press Forming, molding agent removal and sintering at 1450 ° C for 50 minutes to make cemented carbide. Among them, the particle size of coarse WC powder is 24.0 μm, the particle size of fine WC powder is 1.4 μm, the weight ratio of coarse WC powder and fine WC powder is 70:30, and the particle size of Co powder is 2.0 μm.

Embodiment 2

[0008] Example 2: Mix WC powder of two types of thickness and 10.0wt% Co powder according to certain requirements, unload after 20-23 hours of wet grinding, settle for 5-8 hours, dry and vibrate, mix with forming agent to granulate, and press Forming, molding agent removal and sintering at 1450 ° C for 50 minutes to make cemented carbide. Among them, the particle size of coarse WC powder is 28.4 μm, the particle size of fine WC powder is 1.8 μm, the weight ratio of coarse WC powder and fine WC powder is 70:30, and the particle size of Co powder is 1.0 μm.

Embodiment 3

[0009] Example 3: Mix two types of WC powder and 9.0wt% Co powder according to certain requirements, unload after 20-23 hours of wet grinding, settle for 5-8 hours, dry and vibrate, mix with forming agent to granulate, and press Forming, molding agent removal and sintering at 1450 ° C for 50 minutes to make cemented carbide. Among them, the particle size of coarse WC powder is 20.0 μm, the particle size of fine WC powder is 1.2 μm, the weight ratio of coarse WC powder and fine WC powder is 70:30, and the particle size of Co powder is 1.5 μm.

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Abstract

The preparation process of hard W-Co alloy includes mixing WC powder and Co powder in 9-10 wt%, wet milling, drying, pelletizing after adding forming agent, pressing to form, elimiating forming agent, sintering and other steps. During compounding material, both coarse WC powder of particle size of 20-30 microns and fine powder of particle size of 1.2-1.8 microns in the weight ratio of 1.5-4 are used. The said preparation process can coordinate the wear resistance and toughness, raise the comprehensive performance of the alloy and expand the application range of the alloy.

Description

1. Technical field [0001] The invention relates to a preparation method of tungsten-cobalt hard alloy, in particular to a preparation method of tungsten-cobalt hard alloy for mining. 2. Background technology [0002] At present, the most widely used cemented carbide in the field of rock drilling is a coarse-grained tungsten-cobalt alloy with a cobalt content of (9-10)%. The preparation method of this type of alloy generally includes the steps of batching WC powder and Co powder, wet grinding, drying, mixing forming agent to granulate, pressing and forming, removing forming agent, sintering and other steps, wherein the particle size of WC powder ranges from (20 to 30 ) μm, the Co content range is controlled at (9-10)wt%, the alloy produced in this way has a hardness value of (86.5-87.5) HRA, a strength value of (2300-3000) MPa or more, and an impact toughness value of generally (4.0~5.0)J / cm 2 . However, the wear resistance and toughness of this type of alloy are usually a...

Claims

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Application Information

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IPC IPC(8): C22C1/04C22C29/08
Inventor 许雄亮吴建国熊琴啸
Owner ZHUZHOU HARD ALLOY GRP CO LTD
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