An added graphene/nano al 2 o 3 Particle wc-co cemented carbide and its preparation method

A cemented carbide and graphene technology, applied in the field of high-performance new materials, can solve problems such as easy agglomeration and performance degradation, and achieve the effects of improving strength, toughness and wear resistance, increasing service life, and broad application prospects

Active Publication Date: 2022-06-21
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, graphene is easy to agglomerate due to its large specific surface area, and adding it to the matrix will reduce its performance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Raw material preparation: Weigh α-Al in a volume ratio of 1:1 2 O 3 powder (20nm) and few-layer graphene oxide powder (400nm), untreated α-Al 2 O 3 Into a beaker, add distilled water to make the solution concentration 5×10 -3 g / ml, and use 1mol / L HCl solution to adjust the pH value to about 3.33, and ultrasonically treat for 2 hours to form a colloid. At the same time, the graphene oxide powder was dispersed in distilled water and ultrasonicated for 5 hours to form a colloid. The two colloids were mixed and sonicated for 1 hour, then quickly frozen in liquid nitrogen, and finally processed in a vacuum freeze dryer for 24 hours to obtain graphene oxide / nano-alumina composite particles. In addition, WC powder with a particle size of 2 μm and pure Co powder with a particle size of 1 μm were prepared.

[0013] According to the mass ratio of WC powder, Co powder and graphene oxide / nano-alumina composite powder of 93.95:6:0.05, the raw material powder was put into a smal...

Embodiment 2

[0015] Weigh α-Al in a volume ratio of 1:2 2 O 3 powder (20nm) and few-layer graphene oxide powder (400nm), untreated α-Al 2 O 3 Into a beaker, add distilled water to make the solution concentration 5×10 -3 g / ml, and use 1mol / L HCl solution to adjust the pH value to about 3.33, and ultrasonically treat for 1 hour to form a colloid. At the same time, the graphene oxide powder was dispersed in distilled water and ultrasonicated for 5 hours to form a colloid. The two colloids were mixed and sonicated for 1 hour, then quickly frozen in liquid nitrogen, and finally processed in a vacuum freeze dryer for 24 hours to obtain graphene oxide / nano-alumina composite particles. In addition, WC powder with a particle size of 0.2 μm and pure Co powder with a particle size of 1 μm were prepared.

[0016] According to the mass ratio of WC powder, Co powder and graphene oxide / nano-alumina composite powder of 89.8:10:0.2, the raw material powder was put into a small ball milling tank, and a...

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Abstract

The present invention relates to a kind of adding graphene / nanometer Al 2 o 3 The invention discloses WC-Co cemented carbide of particles and a preparation method thereof, belonging to the technical field of preparation of high-performance cemented carbide. The addition of graphene oxide / nanometer Al 2 o 3 The raw material and preparation method used for the WC-Co cemented carbide of composite particles are: the nano-Al 2 o 3 Make a colloidal solution, add it to the graphene oxide suspension and ultrasonically mix it for 1-3 hours, then freeze it quickly, and then freeze and dry it in a vacuum to prepare the graphene oxide / nano-Al 2 o 3 composite particles, which are then added to the WC‑Co powder. The final mixed powder composition is: Co: 6‑11wt%, graphene oxide / nano-Al 2 o 3 Composite powder: 0.05‑0.2wt%, the balance is WC powder. The mixed powder is mechanically mixed, the ball milling time is 10min-24h, and the ball mill speed is 30-1400rmin ‑1 ; After cold pressing and sintering to prepare WC-Co cemented carbide, the sintering temperature is 1300-1450°C, the pressure is 0-60MPa, and the time is 5-120min. WC-Co cemented carbide with excellent performance can be prepared through the above method, which is convenient for large-scale industrial application and production.

Description

technical field [0001] The invention belongs to the field of high-performance new materials, and provides a method for improving the properties of WC-Co hard alloys, which can simultaneously improve the hardness, strength and toughness of WC-Co hard alloys. Background technique [0002] Due to its high hardness, high wear resistance, high temperature corrosion resistance and excellent strength and toughness, cemented carbide is widely used in wear-resistant parts and structural parts, plungers of high-pressure vessels, hydraulic cylinders, precision rolls, and synthetic diamonds. Top hammers, rolls of wire rolling mills, etc., therefore occupy an extremely important position in the fields of machinery, metallurgy, cutting tools, precision instruments, and military industries. In fact, although cemented carbide has good mechanical properties, the traditional cemented carbide cannot meet the requirements of high hardness and high toughness at the same time due to the joint inf...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C29/02C22C1/05C22C1/10B22F9/04B22F3/10B22F3/105
Inventor 孙兰苏武丽范洪远
Owner SICHUAN UNIV
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