Extra coarse grain WC-Co hard alloy and preparation process thereof

A cemented carbide and a preparation process technology, applied in the field of extra-coarse-grained WC-Co cemented carbide and its preparation process, can solve the problems of unsuitability for recycling, unsuitable for safe production, and highly toxic triethylamine, etc. Achieve the effect of shortening carbonization time, maintaining concentration uniformity, and promoting grain growth

Active Publication Date: 2012-07-04
HUNAN BOYUN DONGFANG POWDER METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Although my country's total output of cemented carbide ranks first in the world, accounting for more than 40% of the world's total output, the market share of high-performance cemented carbide for shearer and shield machine cutter heads is still less than 2%. The quality of cemented carbide products for coal mining and shield machine cutter heads is still more or less problematic, and it is difficult to be generally recognized by the in

Method used

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  • Extra coarse grain WC-Co hard alloy and preparation process thereof
  • Extra coarse grain WC-Co hard alloy and preparation process thereof
  • Extra coarse grain WC-Co hard alloy and preparation process thereof

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0084] Example 1

[0085] Preparation of WC-6Co cemented carbide

[0086] Step 1: Preparation of tungsten carbide pre-milled powder

[0087] Take extra-coarse tungsten carbide powder with a particle size of (28-29) μm and sub-fine tungsten carbide powder with a particle size of (0.6-0.7) μm, respectively, and perform a ball milling process for 12 hours to obtain tungsten carbide pre-milled powder; The mass ratio of the special coarse tungsten carbide powder to the sub-fine tungsten carbide powder is 9:1; the primary ball milling process parameters are: ball-to-battery ratio: 3:1, rotation speed: 34 rpm, ball milling medium: gasoline;

[0088] Step 2: Preparation of tungsten carbide-cobalt mixed powder

[0089] Mix the tungsten carbide pre-milled powder obtained in the first step with cobalt powder and forming agent, and perform secondary ball milling for 8 hours to obtain tungsten carbide-cobalt-forming agent mixed powder. The cobalt powder and forming agent are added in amounts of tun...

Example Embodiment

[0100] Example 2

[0101] Preparation of WC-7Co cemented carbide

[0102] Take extra-coarse tungsten carbide powder with a particle size of (30-31) μm and sub-fine tungsten carbide powder with a particle size of (0.9-1) μm, respectively, and perform a ball milling process for 8 hours to obtain tungsten carbide pre-milled powder; The mass ratio of the special coarse tungsten carbide powder to the sub-fine tungsten carbide powder is 12:1; the primary ball milling process parameters are: ball-to-battery ratio: 2:1, rotation speed: 36 revolutions per minute, ball milling medium: gasoline;

[0103] Step 2: Preparation of tungsten carbide-cobalt mixed powder

[0104] The tungsten carbide pre-ball milled powder obtained in the first step was mixed with cobalt powder and forming agent, and then subjected to secondary ball milling for 6 hours to obtain tungsten carbide-cobalt-forming agent mixed powder. The cobalt powder and forming agent were added in amounts of tungsten carbide. 7.5% and 0....

Example Embodiment

[0120] Example 3

[0121] Preparation of WC-15Co cemented carbide

[0122] Take extra-coarse tungsten carbide powder with a particle size of (30-31) μm and sub-fine tungsten carbide powder with a particle size of (0.7-0.8) μm, respectively, and perform a ball milling process for 10 hours to obtain tungsten carbide pre-milled powder; The mass ratio of the special coarse tungsten carbide powder and sub-fine tungsten carbide powder is 10:1; the primary ball milling process parameters are: ball-to-battery ratio: 2:1, rotation speed: 40 rpm, ball milling medium: gasoline;

[0123] Step 2: Preparation of tungsten carbide-cobalt mixed powder

[0124] The tungsten carbide pre-ball milled powder obtained in the first step is mixed with cobalt powder and forming agent, and then ball milled for 7 hours to obtain tungsten carbide-cobalt-forming agent mixed powder. The cobalt powder and forming agent are added in amounts of tungsten carbide. 15% and 1% of the mass of the pre-ball milled powder, t...

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Abstract

The invention relates to an extra coarse grain WC-Co hard alloy. The hard alloy comprises 5 to 15 weight percent of Co and the balance of WC, wherein the average grain size of the WC is 6 to 10mu m. A preparation process for the hard alloy comprises the following steps of: pre-ball-milling coarse and fine tungsten carbide to prepare mixed tungsten carbide powder, preparing mixed tungsten carbide powder-cobalt-former mixed powder, pressing, and sintering, wherein the sintering step is divided into a former removing part and a high-temperature sintering part. The average grain size of a metallographic structure of the WC-Co hard alloy prepared by the process is 6mu m or more than 6mu m, the process method is simple and convenient to operate, the prepared hard alloy has a large average grainsize, a narrow grain distribution range, a low thermal expansion coefficient and high heat conductivity, high-temperature wear resistance, transverse rupture strength and rupture toughness, and is suitable for a mining tool and an excavating tool, and the thermal fatigue crack resistance of the alloy is effectively improved.

Description

technical field [0001] The invention relates to a production method of cemented carbide, in particular to an ultra-coarse-grained WC-Co cemented carbide and a preparation process thereof. technical background [0002] During the use of mining tools and excavating tools, cemented carbide parts are subjected to cyclic loads and frictional forces, resulting in instantaneous high temperatures, which cause the alloy to withstand thermal fatigue stress and mechanical stress, resulting in microscopic spalling and microscopic fracture of the alloy surface, as well as high-temperature wear. grain wear. At the instant of 1 / 10 second when the alloy teeth interact with rock and cement, when the pressure increases from 0 to 10 tons, the surface temperature of the alloy teeth can increase from room temperature to 800°C to 1000°C, and thermal fatigue cracks (snake skin) are prone to occur during the use of the alloy. crack). [0003] In recent years, due to the continuous development of ...

Claims

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Application Information

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IPC IPC(8): C22C29/08C22C1/05
Inventor 伏坤杨雄文周建华
Owner HUNAN BOYUN DONGFANG POWDER METALLURGY
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