Ultra-thick hard alloy, and preparation method and application thereof

A cemented carbide and raw material technology, applied in the field of powder metallurgy, can solve the problems of polycrystalline, cobalt pool, and undisclosed drying process conditions, etc.

Active Publication Date: 2012-09-19
赣州海盛钨业股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above-mentioned patent documents do not limit other properties of WC powder and Co powder, such as particle size distribution, total carbon content, combined carbon content, free carbon content, oxygen content, etc., nor disclose specific drying conditions.
The quality of ultra-coarse cemented carbide is closely related to the control of these parameters and the production process of each step. If the production process is not properly controlled, it is easy to produce defects such as micropores, polycrystals, cobalt pools, and uneven grains in the alloy. Thus affecting the comprehensive performance of ultra-coarse cemented carbide

Method used

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  • Ultra-thick hard alloy, and preparation method and application thereof
  • Ultra-thick hard alloy, and preparation method and application thereof
  • Ultra-thick hard alloy, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] (1) Pretreatment: re-carbonize the WC raw material at a high temperature of 2100°C and above, and the carbonization time is 1-2 hours; the WC powder after high-temperature carbonization is subjected to multi-stage screening by ultrasonic oscillation, and the ultrasonic frequency is 20-20 30KHz, WC powder is classified into four grade areas of +60, 60-160, 160-250, -250 mesh

[0073] (2) Ingredients: 10.2% Co powder, the rest WC powder.

[0074] (3) Wet grinding: use alcohol as the wet grinding medium, the ball-to-material ratio is 3:1, the liquid-solid ratio is 300ml / Kg, and the paraffin wax accounting for 2.2% of the raw materials is poured in the form of molten liquid 0.3.hr before the raw materials are added Into the ball mill, the total wet grinding time: 16 hours;

[0075] (4) Spray drying: The slurry obtained after wet grinding is sent to the spray drying tower to obtain the mixture; the process conditions of spray drying are:

[0076] Solid content of slurry: 7...

Embodiment 2

[0094] The process parameters of each step are shown in Table 2. Through the same steps as in Example 1, the obtained ultra-coarse cemented carbide rock drilling tool has a transverse fracture strength of 3200 Mpa, a hardness of 86.2HRA, a coercive force of 3.1KA / m, and a porosity of The degree is A02, B00, C00, and the average grain size of WC is 5.0-6.0μm.

Embodiment 3

[0096] The process parameters of each step are shown in Table 2. Through the same steps as in Example 1, the obtained ultra-coarse cemented carbide rock drilling tool has a transverse fracture strength of 3100 Mpa, a hardness of 86.3HRA, a coercive force of 3.3KA / m, and a porosity of The degree is A02, B00, C00, and the average grain size of WC is 5.0-6.0μm.

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Abstract

The invention discloses an ultra-thick hard alloy, a preparation method and application thereof. The raw material of the ultra-thick hard alloy comprises the following components in percentage by weight: 10.0-10.5% of Co and the balance of WC. The preparation method comprises the following steps of pretreatment, raw material preparation, wet grinding, spray drying, compression moulding and sintering. According to the invention, technical conditions of each component and technical conditions of each step are selected preferentially, and common technical problems in the preparation of ultra-thick ally in China, such as non-even grains, poor anti-impact toughness and thermal fatigue resistance and too many pores. The ultra-thick hard ally has excellent thermal conductivity, impact toughness and thermal fatigue resistance, cross breaking strength is larger than or equal to 3,100Mpa, the hardness is 86-87HRA, the coercive force is 3.0-4.0KA/m, and WC average grain size is 5-6 microns.

Description

technical field [0001] The invention belongs to the field of powder metallurgy, and in particular relates to a WC-Co ultra-coarse crystal grain cemented carbide for mines, a preparation method and application thereof. Background technique [0002] An important application field of cemented carbide is for mining rock drilling tools. The consumption of cemented carbide for rock drilling is about 30% of the total production of cemented carbide. In recent years, with the increase of my country's investment in infrastructure construction, the use of rock drilling cemented carbide has increased significantly, and the output in 2010 has exceeded 5,000 tons. [0003] WC-Co cemented carbide is widely used in the fields of mechanical processing, petroleum, mining, mold and structural wear parts due to its high strength, hardness, excellent wear resistance and oxidation resistance. Sandvik, the world's largest cemented carbide company, classifies the grain size standard of mining all...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/08C22C1/04
Inventor 谭征曾庆宁
Owner 赣州海盛钨业股份有限公司
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