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A method for measuring the thermal expansion coefficient of hydrogen-containing diamond-like coatings at low temperatures

A technology of thermal expansion coefficient and diamond coating, which is applied in the direction of thermal expansion coefficient of materials, can solve the problem that hydrogen-containing diamond-like carbon cannot be obtained

Active Publication Date: 2019-10-08
SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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Problems solved by technology

[0006] The object of the present invention is to provide a method for measuring the thermal expansion coefficient of hydrogen-containing diamond-like coatings at low temperatures, aiming at solving the problem that the prior art cannot obtain the thermal expansion coefficients of hydrogen-containing diamond-like (a-C:H) coatings at low temperatures question

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  • A method for measuring the thermal expansion coefficient of hydrogen-containing diamond-like coatings at low temperatures
  • A method for measuring the thermal expansion coefficient of hydrogen-containing diamond-like coatings at low temperatures
  • A method for measuring the thermal expansion coefficient of hydrogen-containing diamond-like coatings at low temperatures

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[0027] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0028] The embodiment of the present invention provides a method for measuring the thermal expansion coefficient of the hydrogen-containing diamond-like coating at low temperature, comprising the following steps:

[0029] (1) Prepare a-C:H coating samples with two different materials as substrates, and obtain A sample and B sample respectively;

[0030] (2) At temperature T 0 Next, measure the radius of curvature R of the A sample and the B sample with a strain gauge A0 and R B0 ;

[0031] (3) Raise the temperature of the sample to T by the temperature control ...

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Abstract

The invention is applicable to the technical field of coating layer, and provides a method for determining a thermal expansion coefficient of a hydrogen-containing diamond-like coating layer at low temperature, wherein the method comprises the following steps: preparing a-C:H coating layer samples with two different substrates: a sample A and a sample B; successively measuring the curvature radius RA0 and RB0, RA1 and RB1 of the sample A and the sample B at the temperatures of T0 and T1; by a Stoney formula, respectively calculating the sample stress change [delta]sigma A1 and [delta]sigma B1 of the sample A and the sample B under [delta]T=T1-T0, and deforming to obtain the thermal expansion coefficient [alpha]f1 of the a-C:H coating layer; and repeating the above step operations, to obtain the average linear expansion coefficient [alpha]fi of the a-C:H coating layer in different temperature range of Ti-1->Ti at the temperatures of T2, T3... Ti-1, and Ti, and thus obtaining a changing curve of the linear expansion coefficient of the a-C:H coating layer along with the temperature, wherein i is 1, 2, 3....

Description

technical field [0001] The invention belongs to the technical field of coatings, in particular to a method for measuring the thermal expansion coefficient of a hydrogen-containing diamond-like coating at a low temperature. Background technique [0002] Hydrogen-containing diamond-like (a-C:H) coatings are especially suitable for solid lubricated parts in spacecraft, such as separation mechanisms of spacecraft or space stations, due to their extremely low friction coefficient (<0.01) in vacuum and dry environments. Locking mechanism, docking mechanism, ball bearing of solar panel mechanism, automatic control system of oxygen regulating valve, gyroscope and inertial control system, transmission mechanism of space resource drilling equipment, etc. Space components that require solid lubrication. [0003] As a solid lubricating coating for space components, its working environment is very different from the conventional ground environment. In addition to high vacuum condition...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N25/16
Inventor 唐永炳蒋春磊
Owner SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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