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Preparation method of graphene/carbon nano tubes reinforced aluminum oxide ceramic coating

A technology of alumina ceramics and carbon nanotubes, which is applied in the direction of heating inorganic powder coating, etc., can solve the problems of poor bonding strength of metal substrates, and achieve the effects of low cost, simple preparation process, and low curing temperature requirements

Inactive Publication Date: 2017-07-14
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is favored in the fields of petrochemical industry, national defense, machinery and electronic industry, but due to the high hardness and brittleness of ceramic materials and the difference in expansion coefficient between the two, the bonding strength between them and the metal matrix is ​​relatively poor.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0026] Embodiment 1: Weigh the powder according to 0.2% graphene and 99.8% alumina, use a planetary ball mill at 300r / min for 8h, mix the aggregate with the adhesive in a mass ratio of 1:0.8, and apply it with a short-haired brush Cover on the Q235 sample, dry in the shade for 2 hours, heat evenly in a blast drying oven to 50°C for 1 hour, then heat to 100°C, hold for 2 hours, continue heating to 250°C, hold for 1 hour, heat to 300°C for 1 hour, Make it cool naturally in the box for 24h to obtain the desired finished product. The fracture toughness reaches 4.2MPa*m1 / 2, the bending strength reaches 358MPa, (pure alumina 3.5MPa*m1 / 2, 350MPa), and the friction coefficient is 0.47 (pure alumina 0.48).

Embodiment approach 2

[0027] Embodiment 2: Weigh the powder according to graphene 0.2%, MWNT-COOH-SDBS 0.2% alumina 99.6%, use a planetary ball mill at 300r / min for 8 hours, mix the aggregate with the adhesive fully in a mass ratio of 1:0.8 Stir, apply on the Q235 sample with a short-haired brush, dry in the shade for 2 hours, heat evenly in a blast drying oven to 50°C for 1 hour, then heat to 100°C, hold for 2 hours, continue heating to 250°C, and hold for 1 hour. Heating to 300°C for 1 hour, allowing it to cool naturally in the box for 24 hours to obtain the desired finished product. The fracture toughness reaches 4.8MPa*ml / 2, the flexural strength reaches 371MPa (3.5MPa*ml / 2, 350MPa for pure alumina), and the friction coefficient is 0.43 (0.48 for pure alumina).

Embodiment approach 3

[0028] Embodiment 3: Weigh the powder according to MWNT-COOH-SDBS 0.2% alumina 99.8%, use a planetary ball mill at 300r / min for 8 hours, mix the aggregate with the adhesive at a mass ratio of 1:0.8, and use short-haired Brush coating on the Q235 sample, dry in the shade for 2 hours, heat evenly in a blast drying oven to 50°C for 1 hour, then heat to 100°C, hold for 2 hours, continue heating to 250°C, hold for 1 hour, heat to 300°C, Keep it warm for 1h, let it cool naturally in the box for 24h to get the desired finished product. Fracture toughness reaches 4.3MPa*m1 / 2, flexural strength reaches 354MPa, (pure alumina 3.5MPa*m1 / 2, 350MPa), friction coefficient is 0.45 (pure alumina 0.48).

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Abstract

The invention provides a preparation method of a graphene / carbon nano tubes reinforced aluminum oxide ceramic coating. The preparation method includes the following steps: adding a less amount of graphene and processed carbon nano tubes to aluminum oxide to obtain a composite ceramic coating, and brush-coating a substrate with the coating, wherein slurry is composed of Al2O3 powder, graphene powder, the processed carbon nano tubes, and an adhesive. The processed carbon nano tubes are dried and ground, and then are subjected to ball milling with the graphene and Al2O3 for 6-8 h according to the ratio; the mass percentage of nano material is not more than 0.4%; the mixed aggregate is fully stirred with the adhesive according to mass ratio of 1:0.8 to obtain a mixture; the mixture is naturally dried for 2 h at a ventilated and shade place, and is gradiently heated at 50-300 DEG C for 5 h to produce the aluminum oxide composite ceramic coating. Compared with a common method of processing ceramic coatings, the method is simpler in equipment and technology and has high adaptability. The ceramic coating has good dispersibility and high binding strength, and is anti-wear and anti-corrosion.

Description

[0001] Technical field: [0002] The invention relates to a preparation method of a graphene / carbon nanotube reinforced alumina ceramic coating. [0003] Background technique: [0004] Alumina ceramics have excellent properties such as high mechanical strength, high insulation resistance, high hardness, wear resistance and corrosion resistance. It is favored in the fields of petrochemical industry, national defense, machinery and electronic industry, etc., but due to the high hardness and brittleness of ceramic materials and the difference in expansion coefficient between the two, the bonding strength between them and the metal matrix is ​​relatively poor. [0005] Both carbon nanotubes and graphene are nano-sized carbonaceous materials. Due to their large surface area, good electrical and thermal conductivity, and superior mechanical properties, they have great application prospects in recent years, and there will be a gap between them. A synergistic effect, the physical and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/622C04B35/626C23C24/08
Inventor 赵永武秦卢梦
Owner JIANGNAN UNIV
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