A kind of preparation method of wc co cemented carbide for mining

A cemented carbide, mining technology, applied in the field of powder metallurgy, can solve the problems of reducing the service life of alloys, broken teeth, broken teeth, etc., and achieve the effect of expanding the scope of application

Active Publication Date: 2017-03-15
ZHUZHOU HARD ALLOY GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the alloy contains Ti, V, Cr and other impurity elements, it is easy to cause early damage such as broken teeth and broken teeth of the alloy, and reduce the service life of the alloy

Method used

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  • A kind of preparation method of wc co cemented carbide for mining
  • A kind of preparation method of wc co cemented carbide for mining
  • A kind of preparation method of wc co cemented carbide for mining

Examples

Experimental program
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Effect test

Embodiment 1

[0017] Example 1: Production of rock drilling inserts with a cobalt content of 11% (mass percentage, the same below), and determining the target coercive force Hc of the raw material according to the grade 目标 is 6.9kA / m, the raw material Hcp of the recycled WC is selected 再生 It is 7.2kA / m, Ti原生 It is 6.3kA / m. After calculation, the recycled WC accounts for 66.7% of the WC raw material. The above-mentioned regenerated WC, primary WC and cobalt powder were mixed evenly, wet milled for 18 hours, dried and granulated, pressed and sintered under pressure at 1450°C (pressure 5~70bar). The properties and grain size of the obtained WC-Co cemented carbide for mining are shown in Table 1.

Embodiment 2

[0018] Embodiment 2: Production of rock drilling inserts with a cobalt content of 10%, determining the target coercive force Hc of the raw material according to the grade 目标 is 6.2kA / m, the raw material Hcp of the regenerated WC selected 再生 It is 7.0kA / m, Ti原生 It is 5.0kA / m. After calculation, the recycled WC accounts for 60% of the WC raw material. Mix the above regenerated WC, primary WC and cobalt powder evenly, wet mill for 20 hours, dry granulate, press and sinter at 1450°C (pressure 5~70bar), the obtained WC-Co cemented carbide for mining The properties and grain size are shown in Table 1.

Embodiment 3

[0019] Example 3: To produce rock drilling buttons with a cobalt content of 8%, and determine the target coercive force Hc of the raw material according to the grade 目标 is 7.2kA / m, the raw material Hcp of the regenerated WC is selected 再生 It is 7.0kA / m, Ti原生 It is 7.4kA / m. After calculation, the recycled material WC accounts for 50% of the WC raw material. Mix the above-mentioned regenerated WC, primary WC and cobalt powder evenly, wet mill for 23 hours, dry granulate, press and sinter at 1450°C (pressure 5~70bar), the obtained WC-Co cemented carbide for mining The properties and grain size are shown in Table 1.

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Abstract

The invention relates to a preparation method of WC-Co hard alloy for a mine. Primary WC, regenerative WC and Co powder are used as raw materials, wherein the regenerative WC comprises the following elements: less than or equal to 0.1% of Ti, less than or equal to 0.1% of Cr, less than or equal to 0.05% of V and 6.06%-6.20% of C and the ratio of the raw materials accounting for regenerative WC is a, which meets the following formula: a is equal to a quotient of (Hc target-Hcp primary) divided by (Hcp regenerative-Hcp Primary) and multiplied by 100%, wherein Hc target is a target value of a coercive force of the raw materials and the Hcp Primary and the Hcp regenerative are respectively coercive force values of primary WC and regenerative WC. The hard alloy prepared by the preparation method disclosed by the invention has average grain size of 1.6 to 3.0 microns, alloy hardness greater than 87HRA and bending strength greater than 2800MPa, meets the comprehensive performance requirements of a spherical crown alloy for a mine and can be used in the field of mine drilling application and thus the application range of regeneration WC is expanded.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy, and in particular relates to a preparation method of WC-Co cemented carbide for mining. Background technique [0002] Tungsten is an important strategic resource. With the continuous development of tungsten mineral resources and the continuous increase of tungsten consumption, we will face a severe shortage of tungsten mineral resources. Therefore, the development of circular economy and the full recycling of waste cemented carbide products are the development direction of the cemented carbide industry. [0003] At present, in the process of recycling waste cemented carbide, zinc melting method and electrolysis method are widely used. However, due to the wide variety of recovered hard alloys, the quality indicators such as impurity element content and particle size of the recycled WC raw materials produced fluctuate greatly, and technical personnel have not conducted more detailed and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C29/08C22C1/05
CPCC22C1/051C22C29/08
Inventor 程秀兰洪海侠姚雄志黄蕊阳进
Owner ZHUZHOU HARD ALLOY GRP CO LTD
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