Lubricating oil, lubricating system and application thereof

Abstract

The invention discloses lubricating oil, a lubricating system and application thereof. The lubricating oil comprises base lubricating oil, a phosphide additive and tin telluride nanoparticles. In the lubricating oil disclosed by the invention, the phosphide additive and the tin telluride nanoparticles are matched with each other and can generate a film through friction reaction at a high temperature, so that the lubricating property of the basic lubricating oil at the high temperature is improved, and the boundary lubrication failure behavior is reduced.

Description

Technical Field

[0001] The present invention relates to the field of mechanical friction lubrication. Specifically, the present invention relates to a lubricating oil, a lubricating system and their applications. Background Art

[0002] In the contemporary field of mechanical manufacturing, extreme working conditions are becoming increasingly common. These conditions are characterized by high-speed operation, heavy load-bearing, and high-temperature environments, which pose strict performance and durability requirements for key components such as bearings. In key fields such as aviation, machine tools, and precision instruments, the performance of bearings directly affects the life and reliability of the entire mechanical system. The bearings produced domestically have a large gap in performance and life compared with the international advanced level. The core lies in the fatigue damage and surface damage caused by insufficient lubrication. Bearings can be lubricated with grease, oil, or self-lubricating materials, but these lubricants are prone to solidification or degradation under harsh conditions such as high temperature, which limits the performance and life of the bearings. Therefore, developing lubricants with high toughness and high efficiency under extreme conditions has become a key area that urgently needs to be studied.

[0003] Ethyl silicone oil has its thermal stability improved due to the introduction of ethyl groups into the polysiloxane structure, enabling it to remain stable at higher temperatures and being less prone to decomposition or oxidation, thus meeting the lubrication requirements in high-temperature environments. In addition, ethyl silicone oil has good antioxidant and chemical stability, and also has good viscosity under low-temperature conditions. Therefore, ethyl silicone oil is expected to be used in fields such as automobiles, aviation, electronics, plastic, and rubber processing. However, due to the obvious boundary lubrication failure behavior of ethyl silicone oil on ceramic-to-steel friction pairs, resulting in an instantaneous mutation of its friction coefficient, this directly affects the practical application of ethyl silicone oil in the high-temperature field. Summary of the Invention

[0004] The present invention is made based on the inventor's discovery and understanding of the following facts and problems: Lubricants are prone to solidification or degradation under harsh conditions such as high temperature, which limits the performance and life of bearings. Ethyl silicone oil has obvious boundary lubrication failure behavior on ceramic-to-steel friction pairs, resulting in an instantaneous mutation of its friction coefficient, which directly affects the practical application of ethyl silicone oil in the high-temperature field.

[0005] The present invention aims to solve at least one of the technical problems in the related art to some extent. For this purpose, an embodiment of the present invention provides a lubricating oil, a lubricating system and their applications. The phosphide additive and tin telluride nanoparticles cooperate with each other to generate a film through a friction reaction at high temperature, improving the lubricating performance of the base lubricating oil at high temperature and reducing its boundary lubrication failure behavior.

[0006] An embodiment of the present invention provides a lubricating oil, comprising: a base lubricating oil, a phosphide additive, and tin telluride nanoparticles.

[0007] Advantages and technical effects brought by the lubricating oil according to the embodiments of the present invention: Aiming at problems such as sudden change of friction coefficient at high temperature and boundary lubrication failure of the base lubricating oil, a phosphide additive and tin telluride nanoparticles (nano SnTe) are added to the lubricating oil. The phosphide additive forms an amorphous P-O friction reaction film at the interface, which can effectively isolate the reaction interface and enhance wear resistance. The addition of tin telluride nanoparticles forms a thermoelectric effect during the friction process and forms a Sn-O compound film, further improving the wear resistance. That is, the lubricating oil contains the combined action of a phosphide additive and tin telluride nanoparticles, and can generate a film containing amorphous P-O and Sn-O compounds through friction reaction at high temperature, improving the lubrication performance of the base lubricating oil at high temperature, reducing its boundary lubrication failure behavior, and also achieving a reduction in wear rate (~1.55×10 -7 μm 3 / N·m) at high temperature, reducing the energy consumption of high-end high-temperature equipment, improving the operation accuracy and stability, and extending the service life of mechanical parts.

[0008] In some embodiments, by mass, it includes 80-95 parts of base lubricating oil, 0.01-15 parts of phosphide additive, and 0.01-5 parts of tin telluride nanoparticles.

[0009] In some embodiments, the base lubricating oil includes ethyl silicone oil;

[0010] and / or, the phosphide additive includes at least one of triphenylphosphine, triphenylphosphine oxide, triphenyl phosphate, triphenyl phosphite, or triphenyl thiophosphate;

[0011] and / or, the molar ratio of tellurium to tin elements in the tin telluride nanoparticles is 1-1.07:0.93-1;

[0012] and / or, the particle size of the tin telluride nanoparticles is 5-200 nm.

[0013] In some embodiments, it further includes an antioxidant; including 0-1 part of antioxidant; the antioxidant includes 2,6-di-tert-butyl-p-cresol.

[0014] In some embodiments, it further includes a dispersant; including 0-1 part of dispersant; the dispersant includes succinimide.

[0015] The embodiments of the present invention provide a preparation method of a lubricating oil, including: mixing and dissolving each component of the lubricating oil to obtain the lubricating oil.

[0016] An embodiment of the present invention provides a lubrication system, comprising: lubricating oil and a friction pair; the lubricating oil comprises the lubricating oil described in the embodiment of the present invention, and the friction pair comprises at least one of ceramics and steel. In the embodiment of the present invention, the friction coefficient of the base lubricating oil mutates in the ceramic / steel friction pair at high temperature. The lubricating oil of the embodiment of the present invention can generate a film through a friction reaction at high temperature, improve the lubricating performance of the base lubricating oil at high temperature, and reduce its boundary lubrication failure behavior.

[0017] In some embodiments, the ceramics comprise Si3N4; and / or, the steel comprises M50.

[0018] An embodiment of the present invention provides an application of a lubricating oil or a lubrication system, which is applied at a temperature greater than 150 °C. In the embodiment of the present invention, the lubricating oil can generate a film through an effective friction reaction at high temperature, can effectively improve the anti-friction and anti-wear performance at high temperature, and can have better lubricating performance at a temperature greater than 150 °C.

[0019] In some embodiments, it is used in aerospace, new energy or electric vehicles. Detailed Embodiments

[0020] The embodiments of the present invention will be described in detail below. The embodiments are exemplary and are intended to explain the present invention, but should not be construed as a limitation to the present invention.

[0021] A lubricating oil according to an embodiment of the present invention comprises: a base lubricating oil, a phosphide additive, and tin telluride nanoparticles.

[0022] For the lubricating oil of the embodiment of the present invention, aiming at problems such as the mutation of the friction coefficient of the base lubricating oil and the boundary lubrication failure at high temperature, a phosphide additive and tin telluride nanoparticles (nano SnTe) are added to the lubricating oil. The phosphide additive forms an amorphous P-O friction reaction film at the interface, which can effectively isolate the reaction interface and enhance the wear resistance. The addition of tin telluride nanoparticles forms a thermoelectric effect during the friction process and forms a Sn-O compound film, further improving the wear resistance. That is, the lubricating oil contains the combined action of a phosphide additive and tin telluride nanoparticles, and can generate a film containing amorphous P-O and Sn-O compounds through a friction reaction at high temperature, improve the lubricating performance of the base lubricating oil at high temperature, reduce its boundary lubrication failure behavior, and also achieve a reduction in the wear rate (~1.55×10 -7 μm 3 / N·m) at high temperature, reduce the energy loss of high-end high-temperature equipment, improve the operation accuracy and stability, and extend the service life of mechanical components.

[0023] In some embodiments, by mass, it includes 80 - 95 parts of base lubricating oil, 0.01 - 15 parts of phosphide additive, and 0.01 - 5 parts of tin telluride nanoparticles. Specifically, it includes 80 - 95 parts (80 parts, 82 parts, 84 parts, 86 parts, 88 parts, 90 parts, 92 parts, 94 parts, 95 parts) of base lubricating oil, 0.01 - 15 parts (0.01 part, 0.1 part, 1 part, 2 parts, 5 parts, 8 parts, 10 parts, 12 parts, 15 parts) of phosphide additive, and 0.01 - 5 parts (0.01 part, 0.1 part, 1 part, 2 parts, 3 parts, 4 parts, 5 parts) of tin telluride nanoparticles.

[0024] In the embodiments of the present invention, the lubricating oil includes 80 - 95 parts of base lubricating oil, 0.01 - 15 parts of phosphide additive, and 0.01 - 5 parts of tin telluride nanoparticles, which is further beneficial to improving the lubricating performance of the lubricating oil at high temperatures, reducing the boundary lubrication failure behavior, and also achieving a reduction in the wear rate at high temperatures. When the content of the phosphide additive is lower, the extreme pressure and anti-wear performance of the lubricating oil is relatively poor, and wear and corrosion are likely to occur; when the content of the phosphide additive is higher, it may lead to the formation of excessive precipitation or colloid, affecting the stability and fluidity of the lubricating oil. When the content of the tin telluride nanoparticles is lower, the improvement of the high-temperature lubricating performance of the lubricating oil is limited, and it is difficult to effectively reduce the wear rate; when the content of the tin telluride nanoparticles is higher, it may lead to uneven particle dispersion or have a negative impact on the fluidity of the lubricating oil, instead reducing the lubrication effect.

[0025] In some embodiments, the base lubricating oil includes ethyl silicone oil. In the embodiments of the present invention, due to the obvious boundary lubrication failure behavior of ethyl silicone oil on the ceramic-to-steel friction pair, resulting in an instantaneous mutation of its friction coefficient, this directly affects the practical application of ethyl silicone oil in the high-temperature field. The combined action of ethyl silicone oil, phosphide additive, and tin telluride nanoparticles in the lubricating oil of the present invention can generate a film containing P - O and Sn - O through friction reaction, improving the lubricating performance of ethyl silicone oil at high temperatures and reducing its boundary lubrication failure behavior.

[0026] In some embodiments, the phosphide additive includes at least one of triphenylphosphine, triphenylphosphine oxide, triphenyl phosphate, triphenyl phosphite, or triphenyl thiophosphate. In the embodiments of the present invention, the lubricating performance of the lubricating oil is further improved by preferably selecting the phosphide additive.

[0027] In some embodiments, the molar ratio of tellurium to tin elements in the tin telluride nanoparticles is 1 - 1.07:0.93 - 1; optionally, the tin telluride nanoparticles include SnTe, SnTe 1.07 or Sn 0.93 at least one of Te.

[0028] In some embodiments, the particle size of the tin telluride nanoparticles is 5 to 200 nm. Specifically, for example, 5 nm, 10 nm, 50 nm, 100 nm, 150 nm, 200 nm.

[0029] In some embodiments, the tin telluride nanoparticles are synthesized by microwave; specifically, it includes: mixing SnO, SiO2, TeO2, WC, NaOH and water for reaction to obtain tin telluride nanoparticles; optionally, the ratio of SnO, SiO2, TeO2, WC, NaOH and water is 0.4 - 0.5 g, 0.5 - 0.7 g, 0.2 - 0.4 g, 0.04 - 0.07 g, 1 - 3 mL of NaOH solution, 60 - 80 mL; the concentration of the NaOH solution is 0.1 mol / L; the temperature of the reaction is 150 - 220 °C; the time of the reaction is 3 - 6 h; the pressure of the reaction is 1.8 - 2.14 MPa; stirring is carried out during the reaction process; optionally, the mixed liquid after the reaction is centrifuged and dried to remove impurities to obtain tin telluride nanoparticles.

[0030] In some embodiments, it further includes an antioxidant; including 0 - 1 part of antioxidant. Specifically, for example, 0.01 part, 0.1 part, 0.2 part, 0.5 part, 0.8 part, 1 part; the antioxidant includes dibutylhydroxytoluene. In the embodiments of the present invention, adding an antioxidant is beneficial to enhancing the antioxidant property of the lubricating oil.

[0031] In some embodiments, it further includes a dispersant; including 0 - 1 part of dispersant. Specifically, for example, 0.01 part, 0.1 part, 0.2 part, 0.5 part, 0.8 part, 1 part; the dispersant includes succinimide. In the embodiments of the present invention, adding a dispersant is beneficial to the dispersion of the phosphide additive and the tin telluride nanoparticles, and further improves the lubricating performance of the lubricating oil.

[0032] A preparation method of a lubricating oil according to an embodiment of the present invention includes: mixing and dissolving each component of the lubricating oil to obtain the lubricating oil.

[0033] In some embodiments, the mixing is carried out by ultrasonic mixing; the dissolution is carried out by heating dissolution; that is, each component of the lubricating oil is ultrasonically mixed and heated for dissolution to obtain the lubricating oil; optionally, the ultrasonic mixing and the heating dissolution are carried out simultaneously or not simultaneously; the time of the ultrasonic is 30 - 60 min. Specifically, for example, 30 min, 40 min, 50 min, 60 min; the temperature of the heating is 70 - 110 °C. Specifically, for example, 70 °C, 80 °C, 90 °C, 100 °C, 110 °C; the heating can be carried out by water bath heating. In the embodiments of the present invention, heating is beneficial to the uniform mixing of the lubricating oil.

[0034] A lubrication system according to an embodiment of the present invention includes: lubricating oil and a friction pair; the lubricating oil includes the lubricating oil according to the embodiment of the present invention, and the friction pair includes at least one of ceramics and steel. In the embodiment of the present invention, the coefficient of friction of the base lubricating oil changes abruptly in the ceramic / steel friction pair at high temperatures. The lubricating oil of the embodiment of the present invention can generate a film through a friction reaction at high temperatures, improve the lubricating performance of the base lubricating oil at high temperatures, and reduce its boundary lubrication failure behavior.

[0035] In some embodiments, the friction pair includes at least one of ceramics and steel; optionally, the friction pair includes ceramics and steel; the friction pair includes rolling elements and rings; the rolling elements include ceramics and the rings include steel; the ceramics include Si3N4; the steel includes M50. In the embodiment of the present invention, with the emergence of new technologies and the growing demand for long-life and high-performance bearings, AISIM50 (AMS 6491) steel is a major technological breakthrough for high-temperature bearings in aero gas turbines. Ceramic materials represented by Si3N4 are considered potential materials for next-generation bearings due to their excellent low density, low coefficient of friction, small coefficient of thermal expansion, high strength, and excellent heat resistance.

[0036] An application of a lubricating oil or a lubrication system according to an embodiment of the present invention is applied at a temperature greater than 150°C. In the embodiment of the present invention, the lubricating oil can generate a film through an effective friction reaction at high temperatures, effectively improving the friction reduction and anti-wear performance at high temperatures, and having excellent lubricating performance at temperatures greater than 150°C.

[0037] In some embodiments, it is applied at a temperature greater than 150°C, optionally greater than 230°C, greater than 260°C, greater than 300°C. In the embodiment of the present invention, the lubricating oil can have excellent lubricating performance at high temperatures, which is beneficial to the actual operation of the lubrication system under special working conditions such as high temperature and high pressure.

[0038] In some embodiments, it is used in aerospace, new energy, or electric vehicles. Optionally, the new energy includes wind power new energy and photovoltaic new energy. In the embodiment of the present invention, the lubricating oil can be applied to the fields of aerospace, high-end equipment, precision devices, new energy, or electric vehicles, which is beneficial to the actual operation of the lubrication system under special working conditions such as high temperature and high pressure, reduces the energy consumption of high-end high-temperature equipment, improves the operation accuracy and stability, and extends the service life of mechanical components.

[0039] The present invention will be described below with reference to specific embodiments. It should be noted that these embodiments are merely descriptive and do not limit the present invention in any way.

[0040] Optimol is used in the following examples or comparative examples. A multi-functional friction and wear testing machine is used to conduct micro-friction tests. Unless otherwise specified, the materials, reagents, methods, and instruments used are all conventional materials, reagents, methods, and instruments in this field, and those skilled in the art can obtain them through commercial channels.

[0041] Example 1

[0042] A lubricating oil, by mass, includes: 90 parts of ethyl silicone oil, 5 parts of a phosphide additive (3 parts of triphenyl thiophosphate and 2 parts of triphenyl phosphite), 3 parts of tin telluride nanoparticles SnTe with a particle size of 5 - 200 nanometers, 1 part of antioxidant 2,6-di-tert-butyl-p-cresol, and 1 part of dispersant succinimide.

[0043] The synthesis method of tin telluride nanoparticles SnTe is microwave synthesis. Specifically, it includes: mixing 0.4885 g of SnO, 0.5121 g of SiO2, 0.3231 g of TeO2, 0.069 g of WC, 3 mL of 0.1 mol / L NaOH solution, and 75 mL of H2O for reaction, with a rotation speed of 800 rpm. Heat to 100 °C in 15 minutes and keep for 15 min, then heat to 200 °C in 15 minutes and keep for 6 h, with the pressure maintained at 1.8 - 2.14 MPa. After obtaining the mixed liquid, centrifuge and dry it to remove impurities to obtain tin telluride nanoparticles SnTe.

[0044] The preparation method of the lubricant includes ultrasonic mixing of ethyl silicone oil, phosphide additive, tin telluride nanoparticles, antioxidant, and dispersant, and heating to 70 °C for dissolution to obtain the lubricating oil.

[0045] The anti-wear performance test method: Use Si3N4 ceramic as the upper specimen (diameter 10.3 mm), and M50 steel disk as the lower specimen (Φ24 mm × 7.88 mm, Ra = 13 nm). The ball and the disk are ultrasonically cleaned with petroleum ether, acetone, absolute ethanol, and ultrapure water in sequence for 15 min, and then dried with compressed N2 for standby. All tests are carried out under the conditions of a frequency of 50 Hz, a stroke of 1 mm, a sliding time of 60 min, and a load of 30 N (contact stress of 1.607 GPa). Before the friction and wear experiment, 100 μL of the lubricating oil is added to the ball-disk contact area, and the test temperatures are 150 °C, 230 °C, 260 °C, and 300 °C respectively. After the test, the parameters are automatically stored.

[0046] After testing, the average friction coefficients are 0.037 @ 150 °C, 0.048 @ 230 °C, 0.051 @ 260 °C, and 0.054 @ 300 °C respectively. The combined action of the phosphide additive and tin telluride nanoparticles in the lubricant can generate a film containing amorphous P - O and Sn - O compounds through friction reaction at high temperatures, improving the lubrication performance at high temperatures and effectively reducing friction and wear.

[0047] Example 2

[0048] It is the same as the lubricating oil and method of Example 1, except that 5 parts of phosphide additive (3 parts of triphenyl thiophosphate and 2 parts of triphenyl phosphite) are replaced by 5 parts of phosphide additive (2 parts of triphenyl thiophosphate and 3 parts of triphenyl phosphate).

[0049] After testing, the average friction coefficients are 0.057@150°C, 0.058@230°C, 0.062@260°C, and 0.066@300°C respectively. The combined action of the phosphide additive and tin telluride nanoparticles in the lubricant can generate a film through frictional reaction at high temperatures, improving the lubrication performance at high temperatures and effectively reducing friction and wear.

[0050] Example 3

[0051] It is the same as the lubricating oil and method of Example 1, except that 5 parts of phosphide additive (3 parts of triphenyl thiophosphate and 2 parts of triphenyl phosphite) are replaced by 6 parts of phosphide additive (3 parts of triphenyl thiophosphate and 3 parts of triphenyl phosphine oxide).

[0052] After testing, the average friction coefficients are 0.073@150°C, 0.088@230°C, 0.126@260°C, and 0.153@300°C respectively. The combined action of the phosphide additive and tin telluride nanoparticles in the lubricant can generate a film through frictional reaction at high temperatures, improving the lubrication performance at high temperatures and effectively reducing friction and wear.

[0053] Example 4

[0054] It is the same as the lubricating oil and method of Example 1, except that the lubricating oil contains 5 parts of tin telluride nanoparticles SnTe with a particle size of 5 - 200 nanometers.

[0055] After testing, the average friction coefficients are 0.089@150°C, 0.093@230°C, 0.102@260°C, and 0.107@300°C respectively.

[0056] Comparative Example 1

[0057] It is the same as the lubricating oil and method of Example 1, except that tin telluride nanoparticles SnTe are not added to the lubricating oil.

[0058] After testing, the average friction coefficients are 0.077 @ 150 °C, 0.121 @ 230 °C, 0.133 @ 260 °C, and 0.161 @ 300 °C. Compared with Example 1, tin telluride nanoparticles SnTe are not added to the lubricating oil in Comparative Example 1, and the average friction coefficients under various temperature conditions increase. This is because the lubricating oil in Example 1 contains the combined action of a phosphide additive and tin telluride nanoparticles, which can generate a film containing amorphous P-O and Sn-O compounds through friction reaction at high temperatures, improving the lubrication performance of the base lubricating oil at high temperatures, reducing its boundary lubrication failure behavior, and achieving a reduction in wear rate even at high temperatures. In addition, the high-content phosphide additive in Comparative Example 1 is prone to thermal decomposition and oxidation at 300 °C, generating acidic substances and deposits, accelerating the deterioration of the lubricating oil, and reducing its performance.

[0059] Comparative Example 2

[0060] It is the same as the lubricating oil and method of Example 1, except that tin telluride nanoparticles SnTe and triphenyl thiophosphate are not added to the lubricating oil.

[0061] After testing, the average friction coefficients are 0.101 @ 150 °C, 0.141 @ 230 °C, 0.118 @ 260 °C, and 0.128 @ 300 °C. The lubricating oil in Comparative Example 2 contains triphenyl phosphite. When the temperature exceeds 250 °C, a phosphide reaction film is generated, effectively reducing the friction coefficient. The average friction coefficient at 260 °C is 0.118, and the average friction coefficient at 300 °C is 0.128. However, the friction reaction film ruptures at higher temperatures.

[0062] Comparative Example 3

[0063] It is the same as the lubricating oil and method of Example 1, except that tin telluride nanoparticles SnTe and triphenyl phosphite are not added to the lubricating oil.

[0064] After testing, the average friction coefficients are 0.108 @ 150 °C, 0.124 @ 230 °C, 0.132 @ 260 °C, and 0.133 @ 300 °C.

[0065] Comparative Example 4

[0066] It is the same as the lubricating oil and method of Example 1, except that the phosphide additive is not added to the lubricating oil.

[0067] After testing, the average friction coefficients are 0.122 @ 150 °C, 0.133 @ 230 °C, 0.157 @ 260 °C, and 0.182 @ 300 °C.

[0068] Comparative Example 5

[0069] Same as the lubricating oil and method of Example 1, except that tin telluride nanoparticles SnTe and phosphide additives are not added to the lubricating oil.

[0070] After testing, the average friction coefficients are 0.145 @ 150 °C, 0.188 @ 230 °C, 0.235 @ 260 °C, and 0.255 @ 300 °C. The friction coefficient of the ethyl silicone oil in the Si3N4 / M50 system mutates at high temperatures in Comparative Example 5.

[0071] Comparative Example 6

[0072] Same as the lubricating oil and method of Example 2, except that tin telluride nanoparticles SnTe are not added to the lubricating oil.

[0073] After testing, the average friction coefficients are 0.098 @ 150 °C, 0.103 @ 230 °C, 0.112 @ 260 °C, and 0.122 @ 300 °C.

[0074] Comparative Example 7

[0075] Same as the lubricating oil and method of Example 2, except that tin telluride nanoparticles SnTe and triphenyl thiophosphate are not added to the lubricating oil.

[0076] After testing, the average friction coefficients are 0.119 @ 150 °C, 0.135 @ 230 °C, 0.142 @ 260 °C, and 0.121 @ 300 °C. The lubricating oil contains triphenyl phosphate, and a self-lubricating protective film is formed at the friction interface at high temperatures, effectively reducing the friction coefficient. The average friction coefficient at 300 °C is 0.121.

[0077] Comparative Example 8

[0078] Same as the lubricating oil and method of Example 3, except that tin telluride nanoparticles SnTe are not added to the lubricating oil.

[0079] After testing, the average friction coefficients are 0.088 @ 150 °C, 0.111 @ 230 °C, 0.149 @ 260 °C, and 0.161 @ 300 °C.

[0080] Comparative Example 9

[0081] Same as the lubricating oil and method of Example 3, except that tin telluride nanoparticles SnTe and triphenyl thiophosphate are not added to the lubricating oil.

[0082] After testing, the average friction coefficients are 0.114 @ 150 °C, 0.115 @ 230 °C, 0.174 @ 260 °C, and 0.213 @ 300 °C.

[0083] In the present invention, terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0084] Although the above embodiments have been shown and described, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that changes, modifications, substitutions, and variations made by those of ordinary skill in the art to the above embodiments are all within the scope of protection of the present invention.

Claims

1. A lubricating oil, characterized in that, Comprising: Base lubricating oil, phosphide additive and tin telluride nanoparticles.

2. The lubricating oil according to claim 1, wherein By mass, it comprises 80 - 95 parts of base lubricating oil, 0.01 - 15 parts of phosphide additive and 0.01 - 5 parts of tin telluride nanoparticles.

3. The lubricating oil according to claim 1, characterized in that, The base lubricating oil comprises ethyl silicone oil; And / or, the phosphide additive comprises at least one of triphenylphosphine, triphenylphosphine oxide, triphenyl phosphate, triphenyl phosphite or triphenyl thiophosphate; And / or, the molar ratio of tellurium to tin elements in the tin telluride nanoparticles is 1 - 1.07:0.93 - 1; And / or, the particle size of the tin telluride nanoparticles is 5 - 200 nm.

4. The lubricating oil according to claim 1 or 2, characterized in that, It further comprises an antioxidant; it comprises 0 - 1 part of antioxidant; the antioxidant comprises 2,6 - di - tert - butyl - 4 - methylphenol.

5. The lubricating oil according to claim 1 or 2, characterized in that, It further comprises a dispersant; it comprises 0 - 1 part of dispersant; the dispersant comprises succinimide.

6. A method for preparing the lubricating oil according to any one of claims 1-5, characterized in that, Comprising: Mix and dissolve each component of the lubricating oil to obtain the lubricating oil.

7. A lubrication system, characterized in that, Comprising: lubricating oil and friction pairs; the lubricating oil comprises the lubricating oil according to any one of claims 1 - 5, and the friction pairs comprise at least one of ceramics and steel.

8. The lubrication system according to claim 7, characterized in that, The ceramics comprise Si3N4; and / or, the steel comprises M50.

9. Use of the lubricating oil according to any one of claims 1-5 or the lubricating system according to claim 7 or 8, characterized in that, Applied at a temperature greater than 150 °C.

10. The application according to claim 9, wherein For aerospace, new energy or electric vehicles.