Process for preparing tungsten-cobalt hard alloy

A cemented carbide, tungsten-cobalt technology, applied in the field of preparation of tungsten-cobalt cemented carbide, can solve problems such as low toughness and limited application range

Active Publication Date: 2004-12-15
ZHUZHOU HARD ALLOY GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The wear resistance of this type of alloy is excellent, but the toughness is too low. Therefore, the application range of this alloy is limited, and it is generally suitable for rock formations such as coal mines below f=8

Method used

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  • Process for preparing tungsten-cobalt hard alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0007] Example 1: Batch WC powder of two types of thickness and 6.0wt% 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 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 5.0wt% 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 1.2 μm, the weight ratio of coarse WC powder and fine WC powder is 70:30, and the particle size of Co powder is 1.0 μm.

Embodiment 3

[0009] Example 3: Mixing WC powder of two types of thickness and 4.0wt% Co powder according to certain requirements, unloading after 20-23 hours of wet grinding, sedimentation for 5-8 hours, drying and vibrating sieve, granulating with forming agent, and pressing 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 1.8 μm, the weight ratio of coarse WC powder and fine WC powder is 70:30, and the particle size of Co powder is 1.5 μm.

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Abstract

The process of preparing hard W-Co alloy includes compounding material with WC powder and Co powder in 4-6 wt%, wet milling, drying, pelletizing after mixing with excipient, pressing to form, eliminating excipient, sintering and other steps. During compounding material, two kinds of WC powder, including great granularity component of 20-30 micron and fine granularity component of 1.2-1.8 micron in the weight ratio of 1.5-4.0, are used. The said process can compromise the wear resistance and toughness of hard alloy effectively to raise the comprehensive performance of alloy and expand the application range.

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, a type of cemented carbide used in the field of rock drilling is a medium-coarse-grained tungsten-cobalt alloy with a cobalt content of (4-6) wt%. 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 (4 to 13 )μm, the Co content range is controlled at (4~6)wt%, the alloy produced in this way has a hardness value of (89.0~91.0)HRA, a strength value of (1600~2400)MPa, and an impact toughness value of (2.5~3.5)J / cm 2 . The wear resistance of this type of alloy is excellent, but the toughness is too low. Therefore, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/04C22C29/08
Inventor 许雄亮
Owner ZHUZHOU HARD ALLOY GRP CO LTD
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