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Preparation method of titanium nitride coating, base material and application

A titanium coating and titanium nitride technology, which is applied in the field of preparation of titanium nitride coatings, can solve the problems affecting the hardness and wear resistance of TiN coatings, and achieve the effect of improving the nitriding rate

Active Publication Date: 2021-01-01
GUANGDONG INST OF NEW MATERIALS
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  • Description
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AI Technical Summary

Problems solved by technology

With the continuous development of plasma spraying technology, low-pressure reactive plasma spraying technology (F4-VB) was used to prepare titanium nitride coating. The coating has a dense layered structure and the thickness can reach about 70 μm, but the phase composition of the coating is TiN 0.3, Ti2N and TiN phases, there are unnitrided titanium particles in the coating, and the coating nitriding rate is only about 25%, which affects the TiN coating hardness and wear resistance

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  • Preparation method of titanium nitride coating, base material and application
  • Preparation method of titanium nitride coating, base material and application
  • Preparation method of titanium nitride coating, base material and application

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preparation example Construction

[0039]Some embodiments of the present invention provide a method for preparing a titanium nitride coating, which includes: performing low-pressure plasma spraying on the surface of the substrate for the first time to form a titanium-containing coating on the surface of the substrate. The titanium-containing coating is titanium Coating or titanium nitride coating; the titanium coating is subjected to a second low-pressure plasma spraying of nitrogen to nitride the titanium coating.

[0040] The nitriding rate of the titanium nitride coating prepared by low-pressure plasma spraying is creatively improved through the above technical scheme, so that the operation is simple, fast and economical, and the prepared coating is dense and pure. The reason may be that the titanium coating is sprayed by low-pressure plasma first, and then the titanium coating is sprayed again by low-pressure plasma spraying. Both processes are carried out by low-pressure plasma spraying, and the operation i...

Embodiment 1

[0064] (1) Choose stainless steel as the substrate, use 60#SiC to polish the surface, and then use Al 2 o 3 Sandblasting is performed until the surface roughness is Ra=3-4μm, and then ultrasonic cleaning is performed with alcohol. Put 400g, 7-23μm spherical Ti powder into the powder feeder.

[0065] (2) Put the stainless steel substrate into the vacuum chamber and close the hatch of the low-pressure plasma equipment, and extract the vacuum to a pressure of 0.2mbar.

[0066] (3) Fill the gun with Ar to 43mbar, then evacuate the gun to a pressure of 1mbar, preheat the substrate with a plasma jet, and detect the substrate temperature with an infrared thermometer until the substrate temperature reaches 700°C.

[0067] (4) Adjust plasma spraying parameters to prepare titanium coating: spraying pressure is 1.5mbar; spray gun power is 51kW, current is 650A; working gas flow rate is Ar: 45splm, H 2 : 12slpm. After the flame flow is stable, the Ti powder is fed into the plasma flam...

Embodiment 2

[0071] (1) Use stainless steel as the substrate, 60#SiC to polish the surface, and then use Al 2 o 3 Sandblasting is carried out until the surface roughness is Ra=3-4 μm. Put 400g, 7-23μm spherical Ti powder into the powder feeder.

[0072] (2) Put the stainless steel substrate into the vacuum chamber and close the hatch of the low-pressure plasma equipment, and extract the vacuum to a pressure of 0.2mbar.

[0073] (3) Fill the gun with Ar to 43mbar and then ignite the gun. After the gun is evacuated to a pressure of 1mbar, the substrate is preheated by the plasma flame flow, and the substrate temperature is detected by an infrared thermometer until the substrate temperature reaches 750°C.

[0074] (4) Adjust plasma spraying parameters to prepare titanium nitride coating: spraying pressure is 1.5mbar; spray gun power is 54kW, current is 750A; working gas flow rate is Ar: 45splm, H 2 : 12slpm; N 2 : 4slpm; After the flame flow is stable, inject Ti powder into the plasma fla...

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Abstract

The invention discloses a preparation method of a titanium nitride coating, a base material and an application. The preparation method of the titanium nitride coating comprises the following steps: first low-pressure plasma spraying is conducted on the surface of the base material to form a titanium-containing coating on the surface of the base material, and the titanium-containing coating is a titanium coating or a titanium nitride coating; and second low-pressure plasma nitrogen spraying is carried out on the titanium-containing coating, so that the titanium-containing coating can be subjected to nitriding treatment. By changing the existing mode of direct adoption of the low-pressure plasma spraying for the titanium nitride coating, the titanium-containing coating is subjected to low-pressure plasma spraying firstly and then subjected to low-pressure plasma spraying nitridation, long and wide plasma flame flow has a high-reactivity excited state (N2*) in a low-pressure environment,free radicals (N*) and gas molecules (N2) can be respectively subjected to nitridation reaction with the titanium-containing coating in a high-temperature state, so that the formed titanium nitride coating has higher nitridation rate than the titanium nitride coating directly prepared through the low-pressure plasma spraying, and the nitridation rate is greatly increased.

Description

technical field [0001] The invention relates to the technical field of coating preparation, in particular to a preparation method, substrate and application of a titanium nitride coating. Background technique [0002] Stainless steel has excellent corrosion resistance, comprehensive mechanical properties and technological properties, so it is widely used in industries such as petroleum, chemical industry, textile, papermaking, medicine, atomic energy, aviation and marine development. However, stainless steel has low strength and hardness, poor wear resistance, and high friction coefficient; it is not suitable for equipment or components that bear heavy loads and have high requirements for hardness and wear resistance. Especially under the condition of multiple factors such as corrosion, wear and external load, the interaction results will significantly accelerate the destruction process of stainless steel materials and shorten the service life of stainless steel parts. Thes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/134C23C4/08C23C4/10C23C8/36
CPCC23C4/134C23C4/08C23C4/10C23C8/36
Inventor 范秀娟宋琛邓春明刘敏邓畅光玛丽·皮埃尔·普朗什杰弗里·达鲁特廖汉林
Owner GUANGDONG INST OF NEW MATERIALS
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