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Method for preparing Ni cementing WC base cemented carbide

A technology of cemented carbide and mixed powder, applied in the field of preparation of WC-based cemented carbide, can solve problems such as limitations, and achieve the effects of improving solubility, improving impact resistance, and improving strengthening effect.

Inactive Publication Date: 2009-04-01
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, at present, the Ni-generation Co cemented carbide has been mainly used in wear-resistant parts, mining tools and other fields or other occasions with low requirements.
However, the gap between Ni-generation Co cemented carbide and traditional cemented carbide in terms of hardness and wear resistance limits its application in typical cemented carbide products (such as cutting tools) that are used in large quantities.

Method used

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  • Method for preparing Ni cementing WC base cemented carbide
  • Method for preparing Ni cementing WC base cemented carbide

Examples

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example 1

[0015] Example 1: The mixed powder whose composition is WC-6wt% Ni is wet-milled in a roller ball mill. High-quality alloy balls, the ball-to-material ratio (wt%) is 5:1; the wet grinding medium is absolute ethanol, and 1.0-2.0wt% of forming agent polyethylene glycol is added, and the amount of absolute ethanol is 250-300ml / Kg ; The powder after filtration and drying is TNMG220404-ZM under the pressure of 300-400MPa, and its weight is 13.4g; Insulation between ℃ for 2-4h; sintering vacuum degree is higher than 1~5×10 -2 It is carried out under Pa, the sintering temperature is 1440°C-1480°C, and the holding time is 1-1.5h. During vacuum quenching, the nitrogen pressure is 0.1-0.4MPa, and the quenching time is 5-10 minutes; during cryogenic treatment, it is cooled to 150-196°C at a rate of 20-60°C / min; the holding time is 150-220min; The speed of 20-60℃ / min is raised to room temperature; the temperature of vacuum tempering treatment is 120-200℃, the holding time is 1-3h, and t...

example 2

[0016] Example 2: The mixed powder whose composition is WC-8wt% Ni is wet-milled in a roller ball mill, the ball milling speed is 50-80r / min, the grinding time is 48-56h, and the grinding ball is WC-8wt% Co hard with a diameter of Φ10mm. High-quality alloy balls, the ball-to-material ratio (wt%) is 5:1; the wet grinding medium is absolute ethanol, and 1.0-2.0wt% of forming agent polyethylene glycol is added, and the amount of absolute ethanol is 250-300ml / Kg ; The powder after filtration and drying becomes WNMG120408-ZM under the pressure of 300-400MPa, and its weight is 9.8g; Insulation between ℃ for 2-4h; sintering vacuum degree is higher than 1~5×10 -2 It is carried out under Pa, the sintering temperature is 1440°C-1480°C, and the holding time is 1-1.5h. During vacuum quenching, the nitrogen pressure is 0.1-0.4MPa, and the quenching time is 5-10 minutes; during cryogenic treatment, it is cooled to 150-196°C at a rate of 20-60°C / min; the holding time is 100-160min; The spe...

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Abstract

The invention disclose a method for preparing a hard alloy by bonding WC group with Ni, which is characterized by comprising the steps that: firstly, the mixing powder of WC and Ni is subjected to wet grinding, drying and pressing in absolute ethyl alcohol, and then subjected to vacuum sintering at the temperature of 1440 DEG C to 1480 DEG C; when the sintering is finished, nitrogen is introduced to a furnace simultaneously for carrying out vacuum quenching, the pressure of the nitrogen is 0.1MPa to 0.4MPa, and the quenching time is 5min to 10min; after tapping, deep cooling treatment is carried out in liquid nitrogen, the treatment temperature is 150 DEG C to 196 DEG C, and the heat-preservation time is: the hard alloy weight multiplied by weight factor plus the Ni percent content of the hard alloy weight multiplied by component factor, wherein, the weight factor is 5min / g to 25min / g and the component factor is 10min to 20 min; and drawing temper is carried out in a vacuum furnace at the temperature of 120 DEG C to 200 DEG C, the temperature-preservation time is 1h to 3h. By adopting the method for preparing the hard alloy by bonding the WC group with Ni, the contact ratio of the WC can be controlled, the solubility of the WC in Ni is improved, furthermore, the surface stress condition of the alloy after treatment is compressive stress which improves the shock resistance capability of the alloy, thus being capable of realizing the substitution of Ni to Co and obtaining the performances corresponding to WC-Co series hard alloys.

Description

technical field [0001] The invention relates to a method for preparing a hard alloy, in particular to a method for preparing a WC-based hard alloy using Ni as a binder. Background technique [0002] Since the invention of cemented carbide, Co has been the main binder of cemented carbide. Because Co has good wettability and adhesion to the hard phase WC, and the dissolution of C and W in Co makes the WC-Co-based cemented carbide have high hardness, high strength and high wear resistance. Co is a scarce strategic resource. At present, the world's Co reserves (excluding China) are about 4.5 million tons, and the reserve base is 9.6 million tons, and they are mainly distributed in African countries with political turmoil. The supply and demand conditions are complex and very unstable (China Non-political turbulence, supply difficulties; Russia's unstable economy, uncertain export prospects), resulting in large fluctuations in the price of Co. Furthermore, lung cancer has been ...

Claims

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Application Information

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IPC IPC(8): C22C1/05C22C29/08C22F1/16
Inventor 郭智兴熊计陈建中吴悦梅杨梅
Owner SICHUAN UNIV
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