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CNTs reinforced WC-Co hard alloy material and preparation method thereof

A hard alloy, wc-co technology, applied in metal processing equipment, chemical instruments and methods, nanotechnology for materials and surface science, etc. The toughness enhancement effect is not obvious, and CNTs are prone to agglomeration, etc., to achieve the effect of improving toughness and strength, toughness and strength

Active Publication Date: 2022-07-15
江西耀升钨业股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Theoretically speaking, adding CNTs to WC-Co cemented carbide is beneficial to improve the strength and toughness of the alloy, but in industrial production, since the density of CNTs is much smaller than that of WC and Co powder, mixing WC powder, Co powder and CNTs in the ball mill During the process, CNTs are easy to agglomerate, difficult to disperse evenly, and have no obvious effect on grain refinement and strength and toughness enhancement of cemented carbide, and further improvement is needed

Method used

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  • CNTs reinforced WC-Co hard alloy material and preparation method thereof
  • CNTs reinforced WC-Co hard alloy material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037]0.015 g of multi-walled CNTs with a diameter of about 20 nm and an average length of about 2000 nm were placed in an acidic solution for ultrasonic dispersion treatment for 100 min, then heated to 75 °C in a water bath and incubated for 6 hours, then diluted, filtered and washed, and then added deionized water to disperse Wherein, the acidic solution is a mixed solution of concentrated nitric acid with a mass fraction of 65% and concentrated sulfuric acid with a mass fraction of 98%, and the volume ratio of concentrated nitric acid and concentrated sulfuric acid is 1:2.5.

[0038] Cobalt sulfate was added to deionized water to prepare a solution with a cobalt ion concentration of 0.5 g / L, and then the CNTs dispersed in deionized water were added to 0.3 L of cobalt ion solution, and the CNTs and cobalt ions were uniformly dispersed with continuous stirring. A CNTs suspension is obtained.

[0039] A 6% mass fraction of NaOH solution was slowly added dropwise to the CNTs su...

Embodiment 2

[0046] 0.015 g of multi-walled CNTs with a diameter of about 20 nm and an average length of about 2000 nm were placed in an acidic solution for ultrasonic dispersion treatment for 100 min, then heated to 75 °C in a water bath and incubated for 6 hours, then diluted, filtered and washed, and then added deionized water to disperse Wherein, the acidic solution is a mixed solution of concentrated nitric acid with a mass fraction of 65% and concentrated sulfuric acid with a mass fraction of 98%, and the volume ratio of concentrated nitric acid and concentrated sulfuric acid is 1:3.

[0047] Cobalt sulfate was added to deionized water to prepare a solution with a cobalt ion concentration of 1.0 g / L, and then the CNTs dispersed in deionized water were added to 0.18 L of the cobalt ion solution, and the CNTs and cobalt ions were uniformly dispersed by continuous stirring. A CNTs suspension is obtained.

[0048] A 5% mass fraction of NaOH solution was slowly added dropwise to the CNTs ...

Embodiment 3

[0053] 0.015 g of multi-walled CNTs with a diameter of about 20 nm and a length of about 2000 nm were placed in an acid solution for ultrasonic dispersion treatment for 100 min, then heated to 75 °C in a water bath and kept for 6 hours, then diluted, filtered and washed, and then added deionized water to disperse; The acidic solution is a mixed solution of concentrated nitric acid with a mass fraction of 65% and concentrated sulfuric acid with a mass fraction of 98%, and the volume ratio of concentrated nitric acid and concentrated sulfuric acid is 1:2.5.

[0054] Cobalt sulfate was added to deionized water to prepare a solution with a cobalt ion concentration of 1.0 g / L, and then the CNTs dispersed in deionized water were added to 0.075L cobalt ion solution, and the CNTs and cobalt ions were uniformly dispersed by continuous stirring. A CNTs suspension is obtained.

[0055] A 5% mass fraction of NaOH solution was slowly added dropwise to the CNTs suspension until the pH value...

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Abstract

The invention relates to a CNTs reinforced WC-Co hard alloy material and a preparation method thereof. The preparation method of the embodiment comprises the following steps: adding CNTs into an acid solution for oxidation modification treatment; the CNTs subjected to oxidation modification are added into a cobalt salt solution, an alkaline solution is added after even stirring, cobalt ions are converted into cobalt hydroxide particles, suspension liquid of the CNTs loaded cobalt hydroxide particles is obtained, and the pH value of the suspension liquid ranges from 8 to 11; heating the suspension to 55-90 DEG C, then adding a reducing agent, and then filtering, cleaning and drying the product to obtain CNTs loaded cobalt nanoparticle composite powder; and the composite powder, WC powder and Co powder are subjected to ball-milling mixing according to a preset proportion, and then the CNTs reinforced WC-Co hard alloy material is obtained through the steps of forming and spark plasma sintering. CNTs loaded with cobalt nanoparticles are adopted as a reinforcing phase, so that the problem of CNTs agglomeration in the ball milling process can be effectively solved, the CNTs are dispersed in a cobalt binding phase as much as possible, and the mechanical property of the WC-Co hard alloy is improved.

Description

technical field [0001] The invention relates to the field of WC-Co cemented carbide materials; more particularly, to a CNTs (carbon nanotube) reinforced WC-Co cemented carbide material and a preparation method thereof. Background technique [0002] Cemented carbide is known as "the tooth of industry" due to its comprehensive properties such as high hardness and high strength, and is widely used in aerospace, electronic industry, construction machinery and mining and other fields. WC-Co cemented carbide is the most commonly used cemented carbide, which is composed of hard phase WC and binder phase Co. As we all know, WC-Co cemented carbide has the inherent contradiction that the higher the hardness, the lower the strength and toughness, and the higher the strength and toughness, the lower the hardness. [0003] In order to solve this problem, the method of reducing the WC grain size and adding the third phase material is usually adopted. For example, Chinese patent document...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05C22C1/10C22C29/08B22F9/04B22F1/054B22F9/24B82Y30/00B82Y40/00C01B32/168B22F3/14
CPCC22C1/051C22C29/067C22C29/08B22F9/04B22F9/24B82Y30/00B82Y40/00C01B32/168C22C26/00B22F3/14C22C2026/002C22C2026/006B22F2009/043B22F2999/00B22F2202/13
Inventor 郭圣达蔡璜陈颢张建波李宇涛
Owner 江西耀升钨业股份有限公司
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