CN114634835B - Preparation method of high-conductivity and strong-lubrication gallium-based liquid metal lubricant - Google Patents

Preparation method of high-conductivity and strong-lubrication gallium-based liquid metal lubricant Download PDF

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CN114634835B
CN114634835B CN202210097154.1A CN202210097154A CN114634835B CN 114634835 B CN114634835 B CN 114634835B CN 202210097154 A CN202210097154 A CN 202210097154A CN 114634835 B CN114634835 B CN 114634835B
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liquid metal
gallium
lubricant
alloying
conductivity
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CN114634835A (en
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乔竹辉
于源
刘维民
汤华国
崔高熙
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Yantai Advanced Materials And Green Manufacturing Shandong Laboratory
Yantai Zhongke Advanced Materials And Green Chemical Industry Technology Research Institute
Lanzhou Institute of Chemical Physics LICP of CAS
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Yantai Advanced Materials And Green Manufacturing Shandong Laboratory
Yantai Zhongke Advanced Materials And Green Chemical Industry Technology Research Institute
Lanzhou Institute of Chemical Physics LICP of CAS
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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M103/00—Lubricating compositions characterised by the base-material being an inorganic material
    • C10M103/04—Metals; Alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/04—Making non-ferrous alloys by powder metallurgy
    • C22C1/0483—Alloys based on the low melting point metals Zn, Pb, Sn, Cd, In or Ga
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C28/00—Alloys based on a metal not provided for in groups C22C5/00 - C22C27/00
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
    • H01B1/02—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of metals or alloys
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
    • C10N2030/02—Pour-point; Viscosity index
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
    • C10N2030/06—Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure

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  • Engineering & Computer Science (AREA)
  • Metallurgy (AREA)
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  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Lubricants (AREA)

Abstract

The invention discloses a high-conductivity and strong-lubrication gallium-based liquid metal lubricant and a preparation method thereof. The specific formula is that the alloying liquid metal is composed of 97-99 wt% of Ga-In-Sn liquid metal and 1-3 wt% of Bi; then 95-99 wt% of alloyed modified liquid metal and 1-5 wt% of Ag are used to prepare the modified liquid metal lubricant. The alloying and dispersion distribution behaviors of different metal elements are comprehensively utilized, the viscosity and the wettability are improved by utilizing the Bi alloying, the solid auxiliary lubrication is realized by utilizing the simple substance/enriched phase dispersion distribution of the Ag, and the ideal matching of the Bi alloying of the liquid metal and the dispersion distribution of the Ag is realized. The gallium-based liquid metal lubricant prepared by the invention is prepared from metal elements, has excellent conductivity, has lubricating performance obviously superior to that of Ga-In-Sn liquid metal, and has important application prospect In the fields of nucleus, electricity and magnetism.

Description

Preparation method of high-conductivity and strong-lubrication gallium-based liquid metal lubricant
Technical Field
The invention relates to the technical field of lubricating materials, in particular to a preparation method of a high-conductivity and strong-lubricating gallium-based liquid metal lubricant.
Background
Effective lubrication is the key to smooth operation of mechanical equipment and realization of low carbon. The upgrading and improvement of most national defense and civil life key equipment needs to solve one of the problems that the lubrication is effective in a new service environment. With the rapid development of aerospace, nuclear and medical fields, the service requirement of the lubricant of key moving parts is higher and higher. Such as X-ray tube bearings of CT devices, require that the lubricant must have good electrical conductivity in addition to achieving friction reduction. The gallium-based liquid metal keeps liquid phase and fluidity at room temperature to 2000 ℃, has low steam pressure, is nontoxic and environment-friendly, has excellent conductivity and heat conductivity, and is an ideal conductive basic lubricant. However, the higher-end and safer equipment operation requirement puts more rigorous and strict requirements on the service working condition and the operation performance of the bearing, and the lubricating performance of the gallium-based liquid metal must be further improved.
The key problem of improving the liquid metal lubricant is to ensure the conductivity while improving the lubricating property. Key performance parameters of the lubricant include viscosity, wetting and additive phase assisted lubrication properties. Gallium-based liquid metal is generally improved in viscosity by adding silicon dioxide and unsaturated polycarboxylic amine salt and an oxidation mode (a liquid metal thermal conductive paste and a preparation method and application thereof, CN 110643331B), and is improved in lubrication performance by adding oxides, sulfides and borates (a liquid metal lubricant using micro-nano powder as an additive and a preparation method thereof, CN 10902210A). The above-mentioned additive phases are all non-metallic inorganic phase structures, and have poor conductivity, and can deteriorate the conductivity of the liquid metal.
The invention innovatively couples the alloying and dispersion distribution behaviors of metal elements in the gallium-based liquid metal, utilizes the metal elements to simultaneously carry out alloying internal enhancement on the viscosity and wettability of the liquid metal and carry out external addition phase-assisted improvement on the lubricating property of the liquid metal, realizes good compatibility of the alloying liquid metal and a lubricating auxiliary metal additive, and realizes the improvement of the lubricating property while keeping good conductivity. The specific innovative scheme is that the internal structure of the gallium-based liquid metal is improved by using the Bi element in a high-temperature alloying mode, so that the viscosity and wettability of the liquid metal are improved; by adopting micro-granular Ag in a room-temperature mixing mode, simple substance or enriched Ag granules in liquid metal are obtained, abrasion pits are filled, mechanical abrasion of an extreme region is slowed down, and the lubricating performance is improved by coupling solid lubrication and liquid lubrication; the Bi alloying is utilized to improve the good compatibility of the liquid metal and the Ag, the mixing is realized, and the dispersion distribution of the simple substance or the enriched Ag particles in the liquid metal in the shape of tiny particles is obtained.
The presence of the lubricating additive phase in the lubricant has a significant effect on the lubricating properties. The uniform distribution form of the simple substance or the enriched state of the Ag, which is in the form of micro particles, is beneficial to improving the lubricating performance of the invention. 1. The preparation method of the nano silver wire reinforced Ga-In liquid metal lubricant (CN 111040822A) adopts a two-dimensional silver wire material In a simple substance state to realize the lubricating property of Ag; the invention adopts the single substance or the enriched one-dimensional silver powder material, and can realize more uniform distribution under the same addition quality while realizing the lubricating property of Ag; in addition, compared with the rolling of the two-dimensional material limited by the angle, the one-dimensional silver powder material can realize the full-scale and full-angle ball effect and further reduce friction. 2. The existence form of the modified elements in the alloy is two, one is alloying and dissolving in the alloy structure, and the structural performance of the alloy is improved; the other is to maintain the form of a simple substance or a concentrated phase of the self structure, disperse the simple substance or the concentrated phase in the alloy and exert the characteristic performance of the element. The lubricating effect of elements such as Ag is based on the low-shearing-force FCC self-structure of Ag, so that the simple substance or enriched phase form of Ag in liquid metal can be realized, and the solid lubricating effect of Ag can be better exerted. The preparation method of the high-performance liquid metal lubricant (CN 109852453A) realizes the alloying of low-content Al and Ag in Galinstan liquid metal by a ball milling mode, and focuses on realizing that Al and Ag enter the Galinstan liquid metal to realize the alloying; the invention utilizes the mixing of high-content Ag powder particles, focuses on maintaining the simple substance or enriched phase form of the Ag particles to realize the lubricating property of Ag, and utilizes solid lubrication to assist the lubrication of gallium-based liquid metal.
Disclosure of Invention
The invention provides a high-conductivity and strong-lubrication gallium-based liquid metal lubricant and a preparation method thereof. The gallium-based liquid metal high-temperature lubricant disclosed by the invention is based on liquid metal Bi alloying and addition of a metal lubricating auxiliary phase Ag, so that the lubricating performance is improved, and meanwhile, the high conductivity is maintained.
The invention discloses a high-conductivity and strong-lubrication gallium-based liquid metal lubricant which is characterized by consisting of alloying liquid metal and Ag, wherein the composition ratio is as follows: (alloying liquid Metal) (100-y)wt％ -Ag y wt％ ，5≥y＞1；
Wherein the alloying liquid metal consists of Bi, ga, in and Sn In the following composition ratio: (Ga-In-Sn base liquid metal) (100-x)wt％ Bi x wt％ ，3≥x≥1。
The invention relates to a preparation method of a high-conductivity and strong-lubrication gallium-based liquid metal lubricant, which comprises the following steps:
1) In an oxygen-free environment according to (Ga-In-Sn) (100-x)wt％ Bi x wt％ Weighing Bi and Ga-In-Sn room temperature liquid gold according to the proportion that x is more than or equal to 3 and more than or equal to 1, placing the liquid gold In a conical flask, then placing the conical flask In an oil bath pan at the temperature of 200-250 ℃, stirring for 0.5-1.5 hours by using a magneton, and cooling to obtain alloyed liquid metal;
2) According to (alloying liquid metal) (100-y)wt％ Ag y wt％ And weighing the alloyed liquid metal and the silver powder according to the proportion that y is more than or equal to 5 and more than 1, placing the alloyed liquid metal and the silver powder into a mortar, grinding the alloy powder for 0.3 to 1.0 hour in an air environment, and then ultrasonically dispersing the alloy powder for 0.5 to 1 hour to obtain the high-conductivity and strong-lubrication gallium-based liquid metal lubricant.
As a more preferable experimental scheme, the Ga-In-Sn room temperature liquid metal is prepared by using Ga, in and Sn as raw materials according to Ga 65 In 22 Sn 13 Weighing according to the atomic ratio, placing the mixture into a conical flask, stirring the mixture for 1 to 1.5 hours in an oil bath kettle at the temperature of 180 ℃, and cooling the mixture to obtain the catalyst.
As a further preferred embodiment, the oxygen-free environment is an argon atmosphere glove box having an oxygen content of 10ppm or less;
in a further preferred embodiment, bi is a powder having a particle size of 50 to 100nm, ag is a powder having a particle size of 100 to 500nm;
in a more preferred embodiment, the Ga, in, sn, bi, and Ag raw materials each have a purity of 99.99%;
the invention has the beneficial effects that:
(1) The invention utilizes Bi alloying to realize the improvement of the viscosity and the wettability of the Ga-In-Sn liquid metal and keep the good fluidity of the liquid metal; by utilizing the affinity of the alloyed gallium-based liquid metal and Ag particles, the Ag micro particles in the form of simple substances or enriched phases are dispersed and distributed in the gallium-based liquid metal, and the good fluidity of the lubricant is kept; the intrinsic solid lubricating property and the one-dimensional particle bead flowing property of the Ag are realized by utilizing the one-dimensional particle structure of the simple substance or the enriched phase Ag, and the lubricating property of the gallium-based liquid metal is obviously improved; the conflict problem of the lubricating property and the conductivity of the gallium-based liquid metal is solved.
(2) The gallium-based liquid metal lubricant prepared by the invention has excellent conductivity which is higher than 3.0 multiplied by 10 3 S/mm; the lubricating property is measured by adopting an SRV friction and wear testing machine, under the same condition, the friction coefficient is lower than 0.165, the friction coefficient of Ga-In-Sn liquid metal is 0.225, and the lubricating property is obviously superior to that of Ga-In-Sn liquid metal.
(3) The first step of the method is simple in operation process and can be used for batch production; the second step can be finished in an air environment due to the alloying effect, and the operation is convenient and fast; the preparation method of the high-conductivity and strong-lubrication gallium-based liquid metal lubricant is suitable for large-scale production.
Drawings
FIG. 1 shows [ (Ga) prepared in example 1 65 In 22 Sn 13 ) 98wt％ Bi 2wt％ Alloying liquid metals] 98.5wt％ -Ag 1.5wt％ Highly conductive, highly lubricating gallium-based liquid metal lubricant elementDistributing elements;
FIG. 2 shows [ (Ga) prepared in example 1 65 In 22 Sn 13 ) 98wt％ Bi 2wt％ Alloying liquid metals] 98.5wt％ -Ag 1.5wt％ Highly conductive, highly lubricating gallium-based liquid metal lubricant and comparative example 1Ga 65 In 22 Sn 13 Liquid Metal, comparative example 2 (Ga) 65 In 22 Sn 13 ) 98.5wt％ -Ag 1.5wt％ Friction coefficient under the liquid metal medium environment;
FIG. 3 shows example 2[ (Ga) 65 In 22 Sn 13 ) 97wt％ Bi 3wt％ Alloying liquid metals] 96.5wt％ -Ag 3.5wt％ The element distribution of the prepared high-conductivity and strong-lubrication gallium-based liquid metal lubricant;
FIG. 4 shows [ (Ga) of example 2 65 In 22 Sn 13 ) 97wt％ Bi 3wt％ Alloying liquid metals] 96.5wt％ -Ag 3.5wt％ The friction coefficient of the prepared high-conductivity and strong-lubrication gallium-based liquid metal lubricant in the medium environment is increased;
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following specific embodiments and the accompanying drawings, and it is to be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
High-conductivity and strong-lubrication gallium-based liquid metal lubricant [ (Ga) 65 In 22 Sn 13 ) 98wt％ Bi 2wt％ Alloying liquid metals] 98.5wt％ -Ag 1.5wt％ The preparation method comprises the following steps:
1) According to Ga 65 In 22 Sn 13 Weighing Ga, in and Sn raw materials according to the atomic ratio, wherein the purity of the Ga, in and Sn raw materials is 99.99 percent, placing the raw materials into a conical flask, and stirring the raw materials for 1.0 hour In an oil bath kettle at the temperature of 180 DEG CWhile cooling to obtain Ga 65 In 22 Sn 13 A base liquid metal;
2) In an argon atmosphere, the oxygen content of the glove box is less than or equal to 10ppm according to (Ga) 65 In 22 Sn 13 ) 98wt％ Bi 2wt％ In proportion of (1), ga is weighed 65 In 22 Sn 13 The basic liquid metal and Bi, bi is powder, the granularity is 50-100 nm, the purity is 99.99%, the powder is placed in a conical flask, then the conical flask is placed in an oil bath kettle at 210 ℃, magnetons are stirred for 0.8 hour, and the liquid metal is cooled to obtain the alloying gallium base liquid metal;
3) In the air, according to (alloying liquid metal) 98.5wt％ -Ag 1.5wt％ The alloying liquid metal and Ag are weighed as particle powder, the granularity is 100-500 nm, the purity is 99.99%, the powder is placed in a mortar, ground for 1.0 hour in the air environment, and then ultrasonically dispersed for 0.5 hour, and the high-conductivity and strong-lubrication gallium-based liquid metal lubricant is obtained.
Referring to FIG. 1, the [ (Ga) obtained in this example 65 In 22 Sn 13 ) 98wt％ Bi 2wt％ Alloying liquid metals] 98.5wt％ -Ag 1.5wt％ The liquid metal lubricant is subjected to component surface scanning analysis, bi is uniformly distributed in the matrix, and the Bi proves to be aligned to Ga 65 In 22 Sn 13 The liquid metal is alloyed, so that the performance of the matrix liquid metal is improved; ag in the form of single or concentrated phase particles dispersed in (Ga) 65 In 22 Sn 13 ) 98wt％ Bi 2wt％ Alloyed liquid metal.
Example 2
High-conductivity and strong-lubrication gallium-based liquid metal lubricant [ (Ga) 65 In 22 Sn 13 ) 97wt％ Bi 3wt％ Alloying liquid metals] 96.5wt％ -Ag 3.5wt％ The preparation method comprises the following steps:
1) According to Ga 65 In 22 Sn 13 Weighing Ga, in and Sn raw materials with the purity of 99.99 percent according to the atomic proportion, placing the raw materials into a conical flask, and stirring the raw materials In an oil bath kettle at the temperature of 180 DEG CFor 1.2 hours, cooling to obtain Ga 65 In 22 Sn 13 A base liquid metal;
2) In an argon atmosphere, the oxygen content of the glove box is less than or equal to 10ppm according to (Ga) 65 In 22 Sn 13 ) 98wt％ Bi 2wt％ In proportion of (1), ga is weighed 65 In 22 Sn 13 The basic liquid metal and Bi, bi is powder, the granularity is 50-100 nm, the purity is 99.99%, the powder is placed in a conical flask, then the conical flask is placed in an oil bath kettle at 220 ℃, magnetons are stirred for 0.7 hour, and the liquid metal is cooled to obtain the alloying gallium base liquid metal;
3) In the air, according to (alloying liquid metal) 96.5wt％ -Ag 3.5wt％ Weighing the alloyed liquid metal and Ag as particle powder, wherein the granularity of the Ag is 100-500 nm, the purity of the Ag is 99.99%, placing the Ag powder in a mortar, grinding the Ag powder for 0.3 hour in an air environment, and then carrying out ultrasonic dispersion for 0.7 hour to obtain the high-conductivity and strong-lubrication gallium-based liquid metal lubricant.
Referring to FIG. 3, the [ (Ga) obtained in this example 65 In 22 Sn 13 ) 97wt％ Bi 3wt％ Alloying liquid metals] 96.5wt％ -Ag 3.5wt％ The liquid metal lubricant is subjected to component surface scanning analysis, bi is uniformly distributed in the matrix, and the results prove that Bi is applied to Ga 65 In 22 Sn 13 The liquid metal is alloyed, so that the performance of the matrix liquid metal is improved; ag in the form of single or concentrated phase particles dispersed in (Ga) 65 In 22 Sn 13 ) 97wt％ Bi 3wt％ Alloying the liquid metal.
Example 3
High-conductivity and strong-lubrication gallium-based liquid metal lubricant [ (Ga) 65 In 22 Sn 13 ) 99wt％ Bi 1wt％ Alloying liquid metals] 95wt％ -Ag 5wt％ The preparation method comprises the following steps:
1) According to Ga 65 In 22 Sn 13 Weighing Ga, in and Sn raw materials according to the atomic ratio, wherein the purity of the Ga, in and Sn raw materials is 99.99 percent, placing the raw materials into a conical flask, and stirring the raw materials In an oil bath kettle at the temperature of 180 DEG CFor 1.5 hours, cooling to obtain Ga 65 In 22 Sn 13 A base liquid metal;
2) In an argon atmosphere, the oxygen content of the glove box is less than or equal to 10ppm according to (Ga) 65 In 22 Sn 13 ) 99wt％ Bi 1wt％ In proportion of (1), ga is weighed 65 In 22 Sn 13 The basic liquid metal and Bi, bi is powder, the granularity is 50-100 nm, the purity is 99.99%, the powder is placed in a conical flask, then the conical flask is placed in an oil bath kettle at 250 ℃, magnetons are stirred for 0.5 hour, and the liquid metal is cooled to obtain the alloying gallium base liquid metal;
3) In the air, according to (alloying liquid metal) 95wt％ -Ag 5wt％ Weighing the alloyed liquid metal and Ag as particle powder, wherein the granularity of the Ag is 100-500 nm, the purity of the Ag is 99.99%, placing the Ag powder in a mortar, grinding the Ag powder for 0.7 hour in an air environment, and then performing ultrasonic dispersion for 1.0 hour to obtain the high-conductivity and strong-lubrication gallium-based liquid metal lubricant.
Comparative example 1
Ga to be in service 65 In 22 Sn 13 As comparative example 1, the preparation method was: ga. In, sn raw material according to Ga 65 In 22 Sn 13 The weight percentage of the Ga is weighed, the mixture is placed in a conical flask, stirred for 1 hour in an oil bath kettle at the temperature of 180 ℃, and cooled to obtain Ga 65 In 22 Sn 13 A liquid metal.
Comparative example 2
Liquid metal lubricant (Ga) to which only Ag is added without adding Bi 65 In 22 Sn 13 ) 98.5wt％ -Ag 1.5wt％ As comparative example 2;
the preparation method comprises the following steps:
(1) Ga, in and Sn are as raw materials as Ga 65 In 22 Sn 13 The weight percentage of the Ga is weighed, the mixture is placed in a conical flask, stirred for 1 hour in an oil bath kettle at the temperature of 180 ℃, and cooled to obtain Ga 65 In 22 Sn 13 A liquid metal.
(2) According to (Ga) 65 In 22 Sn 13 Liquid metal) 98.5wt％ -Ag 1.5wt％ In proportion of (A) to (B)Ga 65 In 22 Sn 13 Liquid metal and Ag, wherein the Ag is particle powder with the granularity of 100-500 nm and the purity of 99.99 percent, the liquid metal and the Ag are placed in a mortar, ground for 1.0 hour in an air environment and then ultrasonically dispersed for 0.5 hour. Obtaining the liquid metal lubricant.
Test examples
Conductivity test experiment
The highly conductive and highly lubricating gallium-based liquid metal lubricants prepared in example 1, example 2, and example 3 were subjected to a conductivity test.
The test was performed using a Tonghui TH2515 dc four-electrode resistance tester, and the sample was made into a long film by painting. L is the distance between two electrodes (V + and V-) for measuring voltage, S is the sectional area (the sectional area of the conductor perpendicular to the current direction), and the resistivity rho = R S/L; conductivity σ =1/ρ.
The results are shown in Table 1
TABLE 1 conductivity of highly conductive, highly lubricating gallium-based liquid metal lubricants obtained in examples 1-3
Figure BDA0003489726150000081
As can be seen from Table 1, the gallium-based liquid metal lubricants of examples 1, 2 and 3 had conductivities of 3.46X 10, respectively 3 S/mm、3.57×10 3 S/mm、3.54×10 3 S/mm，Ga 65 In 22 Sn 13 Has an electrical conductivity of 3.27X 10 3 S/mm, it can be seen that the highly conductive, highly lubricating gallium-based liquid metal lubricants prepared in examples 1-3 have high conductivity and excellent conductivity.
Frictional wear performance test
The highly conductive and highly lubricating gallium-based liquid metal lubricants obtained in examples 1, 2 and 3 were used as test group examples. Comparative examples 1 and 2 the liquid metal prepared was used as a comparative example.
The test is carried out by using a German SRV friction and abrasion tester, and the grinding materials are GCr15 steel blocks and Si 3 N 4 The experimental temperature of the ball is 50 ℃, the experimental load is 200N,the frequency is 25Hz, the amplitude is 1mm, and the experimental time is 20min; dripping the liquid metal high-temperature lubricant on the GCr15 steel block and Si by using a suction pipe 3 N 4 Between the spheres, then the experiment was started; the experimental equipment automatically recorded the friction coefficient.
The results are shown in figures 2, 4 and Table 2
TABLE 2 highly conductive, highly lubricating gallium-based liquid metal lubricants and Ga obtained in examples 1-3 65 In 22 Sn 13 Coefficient of friction in liquid metal medium environment
Figure BDA0003489726150000091
As can be seen from Table 2, comparative example 1Ga under the same rubbing test conditions 65 In 22 Sn 13 Has a coefficient of friction of 0.225; comparative example 2 (Ga) after adding 1.5wt% of Ag 65 In 22 Sn 13 ) 98.5wt％ -Ag 1.5wt％ The friction coefficient is changed to 0.172, but the friction coefficient is still unstable, and large fluctuation exists; further, a Bi-alloyed liquid metal, example 1[ (Ga) 65 In 22 Sn 13 ) 98wt％ Bi 2wt％ ] 98.5wt％ -Ag 1.5wt％ The friction coefficient of (2) was reduced to 0.163, and the friction coefficient became smooth. Example 2[ (Ga) 65 In 22 Sn 13 ) 97wt％ Bi 3wt％ ] 96.5wt％ -Ag 3.5wt％ And example 3[ (Ga) 65 In 22 Sn 13 ) 99wt％ Bi 1wt％ ] 95wt％ -Ag 5wt％ The friction coefficients of (a) and (b) were 0.152 and 0.145, respectively, and it can be seen that the highly conductive and strongly lubricating gallium-based liquid metal lubricant prepared in examples 1 to 3 had excellent lubricating properties.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (7)

1. A preparation method of a high-conductivity and strong-lubrication gallium-based liquid metal lubricant comprises the following steps:
1) In an oxygen-free environment, according to (Ga-In-Sn liquid metal) (100-x)wt％ Bi x wt％ Weighing Bi and Ga-In-Sn liquid metal In a ratio of more than or equal to 3 and more than or equal to 1, placing the liquid metal In a conical flask, then placing the conical flask In an oil bath kettle at the temperature of 200-250 ℃, stirring the liquid metal for 0.5-1.5 hours by magnetons, and cooling to obtain alloyed liquid metal;
2) According to (alloying liquid metal) (100-y)wt％ Ag y wt％ And weighing the alloyed liquid metal and the silver powder according to the proportion that y is more than or equal to 5 and more than 1, placing the alloyed liquid metal and the silver powder into a mortar, grinding for 0.3-1.0 hour in an air environment, and then ultrasonically dispersing for 0.5-1 hour to obtain the high-conductivity and strong-lubrication gallium-based liquid metal lubricant.
2. The method according to claim 1, wherein the Ga-In-Sn liquid metal lubricant comprises the following components In atomic percent: ga 65 In 22 Sn 13 。
3. The method for preparing a highly conductive and highly lubricating gallium-based liquid metal lubricant as claimed In claim 1, wherein the Ga-In-Sn liquid metal is obtained by placing Ga, in and Sn raw materials In a conical flask, stirring In an oil bath kettle at 180 ℃ for 1-1.5 hours, and cooling.
4. The method for preparing a highly conductive and highly lubricating gallium-based liquid metal lubricant as claimed in claim 1, wherein said oxygen-free environment is argon atmosphere glove box with oxygen content less than or equal to 10ppm.
5. The method according to claim 1, wherein said Bi is powder with a particle size of 50-100 nm, and said Ag is powder with a particle size of 100-500 nm.
6. The method according to claim 1, wherein the Ga, in, sn, bi and Ag raw materials have a purity of 99.99%.
7. A highly conductive, highly lubricating gallium-based liquid metal lubricant prepared by the preparation method according to claim 1, wherein the highly conductive, highly lubricating gallium-based liquid metal lubricant is composed of alloyed liquid metal and Ag in the following composition ratio: (alloying liquid Metal) (100-y) wt％ Ag y wt％ ，5≥y＞1；
Wherein the alloying liquid metal consists of Bi, ga, in and Sn In the following composition ratio: (Ga-In-Sn liquid Metal) (100-x)wt％ Bi x wt％ ，3≥x≥1；
Ag micro particles with simple substance or enriched phase form are dispersed and distributed in the gallium-based liquid metal lubricant.
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