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Graphene-reinforced titanium-based composite and preparation method thereof

A titanium-based composite material and graphene technology, applied in the field of materials, can solve the problems of poor anti-fretting wear performance, low wear resistance, easy adhesion, etc., and achieve the effect of high specific strength

Active Publication Date: 2015-08-19
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, titanium and titanium alloys have inherent disadvantages such as high and unstable friction coefficient, low wear resistance at room temperature and high temperature, easy adhesion, and poor fretting wear resistance.
Therefore, the application of titanium alloy structural materials in the above-mentioned industrial and national defense equipment is severely limited, especially in the application of high-temperature friction and wear motion pair parts to exert the potential of titanium alloy's excellent mechanical properties

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  • Graphene-reinforced titanium-based composite and preparation method thereof
  • Graphene-reinforced titanium-based composite and preparation method thereof
  • Graphene-reinforced titanium-based composite and preparation method thereof

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[0030] The preparation method of the graphene-reinforced titanium-based composite material of the present invention uses graphene as a reinforcing phase, which not only increases the strength of traditional titanium and titanium alloys (alloys), improves their performance, and the obtained composite material has light weight, relatively The advantage of high strength.

[0031] Among them, graphene has sp 2 Two-dimensional carbon atom crystals with hybrid orbitals, low density (~1.06g / cm 3 ), large specific surface area (~2630m 2 g -1 ), with excellent mechanical properties (Young's modulus 0.5-1TPa, tensile strength up to 130GPa). Compared with carbon nanotubes, graphene has a larger specific surface area, so that the obtained composite materials have interfaces with high bonding strength.

[0032] The invention provides a graphene-reinforced titanium-based composite material, the preparation method of which is:

[0033] S1. Weigh titanium powder and graphene nanosheets, ...

Embodiment 1

[0048] The weight ratio of graphene to titanium powder is 0.5wt%, and the titanium powder and graphene nanosheets are weighed. The weighed graphene was ultrasonically dispersed for 30 minutes under the condition of sodium dodecylbenzenesulfonate as a dispersant, and then the weighed titanium powder was added to the graphene nanosheets for mixing, and the dispersion was continued for 30 minutes. The titanium powder and graphene nanosheets after mixing and dispersing are ball milled and dried. The ball milling conditions are: the ratio of ball to material is 4:1, and the speed of the ball mill is 350r / min. After drying, further grinding is performed. The mixed powder treated above is sintered in a spark plasma device. Among them, the heating rate is 200°C / min, the sintering pressure is 40MPa, the sintering temperature is 1100°C, and the holding time is 6min.

Embodiment 2

[0050] The weight ratio of graphene to titanium powder is 1.0wt%, and the titanium powder and graphene nanosheets are weighed. The weighed graphene was ultrasonically dispersed for 30 minutes under the condition of sodium dodecylbenzenesulfonate as a dispersant, and then the weighed titanium powder was added to the graphene nanosheets for mixing, and the dispersion was continued for 30 minutes. The titanium powder and graphene nanosheets after mixing and dispersing are ball milled and dried. The ball milling conditions are: the ratio of ball to material is 4:1, and the speed of the ball mill is 350r / min. After drying, further grinding is performed. The mixed powder treated above is sintered in a spark plasma device. Among them, the heating rate is 200°C / min, the sintering pressure is 40MPa, the sintering temperature is 1100°C, and the holding time is 6min.

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Abstract

The invention discloses a graphene-reinforced titanium-based composite and a preparation method thereof. The preparation method comprises the following steps: S1, weighing titanium powder and graphene nanoflake and carrying out ultrasonic dispersion; S2, subjecting the titanium powder and graphene nanoflake having undergone mixing and dispersion to ball milling; S3, drying and grinding mixed powder formed after ball milling; S4, putting the mixed powder obtained in the step S3 into a graphite die and placing the graphite die in a spark plasma sintering system; S5, carrying out spark plasma sintering on a compacted powder material in the graphite die; and S6, after completion of sintering, cooling a sintered sample to room temperature in a furnace and taking out the sample. The preparation method prepares the graphene-reinforced titanium-based composite with lightweight and high strength and toughness; and according to the method, ultrasonic dispersion and ball milling technologies are employed for powder mixing, then the composite is prepared from the uniformly mixed powder through spark plasma sintering technology, so the advanced composite with lightweight and high specific strength is obtained.

Description

technical field [0001] The invention relates to the field of material technology, in particular to a graphene-reinforced titanium-based composite material and a preparation method thereof. Background technique [0002] Many components used in the aerospace field often need to work under extreme conditions such as ultra-high temperature, ultra-high pressure, and strong corrosion, and need to operate in the atmosphere or outer space for a long time, and cannot be stopped for inspection or replacement of parts. Therefore, components are required to have extremely high reliability and quality assurance. [0003] Titanium and titanium alloys have good heat resistance (melting point up to 1668°C), low density (4.5g / cm 3 , 20°C), high specific strength and a series of excellent properties, it is widely used in modern industries such as aerospace, medical equipment, and chemical industry. However, titanium and titanium alloys have inherent disadvantages such as high and unstable f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05C22C1/10C22C14/00
Inventor 陈瑶宋英刘卫卫赵栋王永光邢占文齐菲
Owner SUZHOU UNIV
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