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Cr/CrNx heat insulating film for top surface of aluminium alloy piston and preparation method of Cr/CrNx heat insulating film

An aluminum alloy, piston top technology, applied in the direction of piston, mechanical equipment, machine/engine, etc., can solve the problem of application, and achieve the effect of reducing stress, improving bonding force, and improving adaptability

Active Publication Date: 2018-01-16
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although chromium nitride thin film has been applied to the field of material surface engineering, it has not been applied to the top surface of the piston.

Method used

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  • Cr/CrNx heat insulating film for top surface of aluminium alloy piston and preparation method of Cr/CrNx heat insulating film
  • Cr/CrNx heat insulating film for top surface of aluminium alloy piston and preparation method of Cr/CrNx heat insulating film
  • Cr/CrNx heat insulating film for top surface of aluminium alloy piston and preparation method of Cr/CrNx heat insulating film

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preparation example Construction

[0049] The invention provides a chromium nitride film on the top surface of an aluminum alloy piston and a preparation method thereof. In order to achieve the purpose of the invention, the technical solution of the invention mainly includes two steps: one is a pretreatment process; the other is a preparation process. The pretreatment process is exactly the same, but the preparation process is different. The pretreatment process mainly includes:

[0050] (1) Use 400#, 800#, 1000#, 1200#, 2000# sandpaper to grind and polish the base of the aluminum alloy piston successively, and then take appropriate amount of acetone solution and absolute ethanol solution to polish the base respectively. Ultrasonic cleaning for 10-15 minutes;

[0051] (2) Before putting the sample into the magnetic filtration cathode vacuum chamber equipment, use a vacuum cleaner to suck the residual dust and attachments in the magnetic filtration cathode arc vacuum chamber, and wipe the sample stage with abso...

Embodiment 1

[0054] Embodiment one (ventilation volume 5sccm, time 120min):

[0055] A kind of Cr / CrN used on the top surface of aluminum alloy piston X A similar heat-insulating film and a preparation method thereof are realized through the following steps:

[0056] (1) Put in the sample, turn on the magnetic filter titanium power supply arc, use the pure metal Cr target as the cathode, adjust the arcing current 100A, negative bias voltage -50v, curved tube magnetic field 1.5A, straight tube magnetic field 3.5A, duty cycle 90% , deposit a pure metal Cr film layer on the pretreated substrate surface, and the deposition time is 20min.

[0057] (2) Turn on the magnetic filter titanium power supply arc, adjust the duty ratio to 20%, and open the gas flow switch to feed the reaction gas nitrogen at the same time, the ventilation rate is 5sccm, and the deposition time is 100min to obtain Cr / CrN X film layer.

[0058] (3) Turn off the gas flow switch, turn off the switch, turn off the arc sou...

Embodiment 2

[0060] Embodiment two (ventilation volume 10sccm, time 120min):

[0061] A kind of Cr / CrN used on the top surface of aluminum alloy piston X A similar heat-insulating film and a preparation method thereof are realized through the following steps:

[0062] (1) Put in the sample, turn on the magnetic filter titanium power supply arc, use the pure metal Cr target as the cathode, adjust the arcing current 100A, negative bias voltage -50v, curved tube magnetic field 1.5A, straight tube magnetic field 3.5A, duty cycle 90% , deposit a pure metal Cr film layer on the pretreated substrate surface, and the deposition time is 20min.

[0063] (2) Turn on the magnetic filter titanium power supply arc, adjust the duty ratio to 20%, and open the gas flow switch to feed the reaction gas nitrogen at the same time, the ventilation rate is 10sccm, and the deposition time is 100min to obtain Cr / CrN X film layer.

[0064] (3) Turn off the gas flow switch, turn off the switch, turn off the arc s...

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Abstract

The invention relates to a Cr / CrNx heat insulating film for the top surface of an aluminium alloy piston and a preparation method of the Cr / CrNx heat insulating film. The Cr / CrNx heat insulating filmis formed by a pure metal Cr layer attached to the top surface of the aluminium alloy piston and a CrNx layer coating the pure metal Cr layer uniformly. The preparation method of the Cr / CrNx heat insulating film comprises the following steps: firstly, the cleaned and dried aluminium alloy piston is placed in an FCVA (filtered cathodic vacuum arc) deposition system, a magnetic filtered Ti power arcis switched on, and the pure metal Cr layer is deposited with a pure metal Cr target as a cathode; the aluminium alloy piston with the pure metal Cr layer on the top surface is obtained; then the pure metal Cr target is taken as the cathode, nitrogen is taken as working gas, the nitrogen introducing amount is regulated, and the CrNx layer is generated on the pure metal Cr layer of the aluminium alloy piston with the pure metal Cr layer on the top surface. The strength, the wear resistance and the heat insulation performance of the obtained product are all better than those of the existing products, requirements of modern engines for high power and low emission can be met, and large-scale industrial application is facilitated.

Description

technical field [0001] The invention relates to a Cr / CrN alloy used on the top surface of an aluminum alloy piston x The invention relates to a heat-insulating film and a preparation method thereof. Specifically, a chromium nitride film is obtained on the top of a piston by a magnetic filter cathodic vacuum arc (FCVA) method, which belongs to the field of material surface engineering—piston surface treatment technology. Background technique [0002] As the main component of the engine to transmit energy, the piston is an important criterion for evaluating the quality, utility and life of the engine. Its quality directly affects the usability, economy and life of the engine, so there are special requirements for its material: small thermal expansion coefficient , low density, good thermal conductivity, corrosion resistance, wear resistance, etc. The aluminum alloy material has the advantages of low density, high strength and easy processing, and can be recycled and utilized ...

Claims

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Application Information

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IPC IPC(8): C23C14/16C23C14/06C23C14/32F02F3/14
Inventor 齐福刚李贝贝欧阳晓平曹红帅罗文忠钟向丽陈静赵镍刘应都
Owner XIANGTAN UNIV
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