Research On The Performance Of H-BN Hybrid Inorganic Functional Materials In Silicone Oil

With the rapid development of modern electronic technology towards miniaturization,high integration and high power density,efficient heat dissipation has become critical to the long life and high performance of the device,and the problem of high-temperature lubrication has become increasingly prominent.Thermally conductive silicone grease is currently a widely used composite material composed of a polymer matrix and inorganic fillers with high thermal conductivity.Dimethicone is widely used because of its good thermal stability and good wettability.In this paper,hexagonal boron nitride(h-BN)is used as a thermally conductive filler,and a method of physical compounding and chemical loading is used to prepare a series of thermal conductive materials are added to dimethyl silicone oil to explore its thermal conductivity and tribological properties.The physical compounding uses the new carbon material carbon nanotubes(CNTs)and graphene nanosheets(GNP)to hybridize with hexagonal boron nitride(h-BN),and the chemical loading loads the Ag particles onto the hexagonal boron nitride(h-BN).)Surface and adsorb mercapto silicone oil.The thermal conductivity of the composite material was tested by a thermal conductivity meter and a thermal imager.The CSM friction and wear tester was used to investigate the friction and wear performance of the composite material,and the scanning electron microscope(SEM)and energy spectrometer(EDS)were used to measure the surface of the wear scar.Perform analysis.The results show that the thermal conductivity and tribological properties have been improved to some extent.The main research contents are as follows:1.Study on the thermal conductivity and tribological properties of hexagonal boron nitride materials with different particle sizes added to dimethyl silicone oilThe effect of adding 5 kinds of h-BN with different particle sizes(1,1-2,5,10,34?m)to the thermal conductivity and tribological properties of silicone oil has been explored.The results show that the particle size and the amount of material added How much will have a great impact on the thermal conductivity.For h-BN with a single particle size,the thermal conductivity increases with the addition of h-BN;and under the same addition,the larger the particle size,the higher the thermal conductivity of h-BN,and the larger the addition,the greater the thermal conductivity The more obvious the gap.Through friction and wear tests,it is found that the addition of h-BN to silicone oil can significantly reduce the friction coefficient under dry friction conditions and the wear surface is smoother.The tribological performance of h-BN with small particle size added to dimethyl silicone oil is better.2.Study on the thermal conductivity and tribological properties of h-BN and new carbon materials added to dimethyl silicone oilUsing new carbon materials(CNTs,Graphene)as compound fillers,CNTs/h-BN,Graphene/h-BN binary silicone grease and CNTs/Graphene/h-BN ternary silicone grease composite materials were prepared,and the thermal conductivity and Tribological properties.Characterize by X-ray diffraction(XRD),Fourier Transform Infrared Spectroscopy(FT-IR),scanning electron microscope(SEM),energy dispersive spectroscopy(EDS),etc.,study its structure and morphology,and use thermal conductivity tester and thermal imaging Tester and CSM friction and wear tester to test the performance of the material.The results show that under the same mass fraction addition,the thermal conductivity is ternary silicone grease>two-component silicone grease>one-component silicone grease;in the tribological performance test,CNTs/Graphene/h-BN ternary silicone grease has good anti-friction resistance The grinding performance shows that the addition of carbon materials and hexagonal boron nitride play a synergistic effect to improve the thermal conductivity and tribological properties.3.Study on the thermal conductivity and tribological properties of h-BN/Ag-mercapto silicone oil material added to dimethyl silicone oilThe thermal conductivity additive material was prepared by loading metallic Ag on h-BN and then adsorbing mercapto silicone oil,and exploring its thermal conductivity and tribological properties in silicone oil.It is found that the thermal conductivity has been improved to a certain extent,and the friction coefficient is lower than that of h-BN added to silicone oil.It shows that the synergistic effect of h-BN and Ag particles improves the thermal conductivity and tribological properties to a certain extent.