Lubricant as well as preparation method and application thereof

A lubricant, liquid metal technology, applied in the field of lubrication, can solve the problems of limited application, mercury human body and environmental hazards, etc.

Inactive Publication Date: 2015-11-18
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The most common liquid metal is mercury, but mercury is seriously harmful to the human body and the environment, which limits its application

Method used

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  • Lubricant as well as preparation method and application thereof

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preparation example Construction

[0023] The preparation method of described lubricant provided by the invention, described method comprises the steps:

[0024] 1) Put the weighed metal components into the same container and heat to melt the metal components into a liquid state;

[0025] 2) Ultrasonic mixing in a water bath at 50°C-100°C for 1 hour to 1.5 hours to make it evenly mixed;

[0026] 3) Inject NaOH solution or HCl solution into a container containing liquid metal, and use a magnetic stirrer to stir for 10 minutes to 20 minutes in a water bath environment of 50°C-100°C, so that the oxides on the surface of the liquid metal are fully reacted; The mass percent concentration of NaOH solution or HCl solution is 5%-8%;

[0027] 4) After the reaction is complete, the solution is separated to prepare a gallium-based liquid metal lubricant.

[0028] According to the national standard GB / T12583-1998 lubricant extreme pressure performance test method, the extreme pressure performance of gallium-based liquid ...

Embodiment 1

[0030] Use pure liquid metal gallium as lubricant (the melting point of pure gallium is 29.8°C).

[0031] According to the national standard GB / T12583-1998 lubricant extreme pressure performance test method, the extreme pressure performance of the gallium lubricant was tested. The test found that the sintering load of the gallium lubricant was greater than 10000N (the maximum load of the four-ball friction testing machine used in the experiment was 10000N). As a comparison, according to the national standard GB / T12583-1998, the gear oil GL-585W / 90 and the extreme pressure grease MobilithSHC1000Special were tested for extreme pressure performance. The test shows that the sintering load of gear oil GL-585W / 90 is 2452N, while the sintering load of MobilithSHC1000Special is 6080N. The average wear scar diameter of the steel balls corresponding to MobilithSHC1000Special under the load of 6080N is 5.3mm. According to the provisions of GB / T12583-1998, the load applied when no sinte...

Embodiment 2

[0033] According to the method proposed in the summary of the invention, liquid metals with mass fractions of Ga, In, and Sn of 64%, 24%, and 12% were prepared, denoted as Ga 64 In 24 sn 12 . Ga 64 In 24 sn 12 It has not solidified at a low temperature of -10°C (that is, its melting point is lower than -10°C). Ga measured on a Hotdisc thermal constant analyzer 64 In 24 sn 12 The thermal conductivity of a gear oil is 25.7W / m.K, and the measured thermal conductivity of a certain gear oil is 0.15W / m.K. Ga 64 In 24 sn 12 The thermal conductivity is much higher than ordinary lubricants. Gallium-based liquid metal lubricants can quickly conduct frictional heat, thereby effectively preventing the occurrence of gluing at the friction interface.

[0034] figure 1 Shown is the measured Ga 64 In 24 sn 12 The coefficient of friction of a lubricant as a function of speed and load. Visible, Ga 64 In 24 sn 12 A notable feature of the lubricant is its low coefficient of f...

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Abstract

The invention provides a lubricant as well as a preparation method and application thereof. The lubricant disclosed by the invention adopts pure-liquid gallium or gallium-base liquid metal, wherein the gallium-base liquid metal comprises the components in percentage by weight: 72%-78% of gallium and 22%-28% of indium, or 60%-70% of gallium, 20%-30% of indium and 8%-16% of tin, or 60%-69% of gallium, 20%-29% of indium, 8%-15% of tin and 0.1%-3% of zinc. The lubricant disclosed by the invention has an excellent lubricating property under the serious working conditions of heavy load, high temperature and the like. According to the lubricant conforming to the Chinese standard GB / T 12583-1998, through the determination of an extreme pressure performance determination method, the sintering load of the lubricant disclosed by the invention is far higher than that of a conventional extreme-pressure lubricant in the market.

Description

technical field [0001] The invention provides a preparation and application method of a gallium-based liquid metal lubricant, belonging to the technical field of lubrication. Background technique [0002] Mechanical components such as gears, bearings, internal combustion engine pistons and cylinder bores, cams and their followers often work under heavy load and high speed conditions. The friction interface is prone to gluing (also called sintering) under heavy load and high speed. Gluing is a serious adhesive wear, which is accompanied by a sharp increase in the temperature, friction coefficient and wear rate of the friction interface, which leads to the complete failure of the friction pair in a very short period of time. In the actual operation of the friction pair, the occurrence of gluing must be avoided as much as possible. The anti-adhesion performance of existing extreme pressure lubricants (such as gear oil and extreme pressure grease) under high temperature and ex...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M103/04
Inventor 田煜李海江贾文鹏田朋溢
Owner TSINGHUA UNIV
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