Performance Analysis And Experiment Of Deep-sea Flexible Buoyancy Material Based On HGM/SR

With the rise of marine science,buoyancy materials are needed to provide buoyancy for various deep-sea equipment used by people when exploring the ocean.At present,hard buoyancy materials are used in deep-sea equipment at home and abroad,which have poor adaptability to complex deep-sea environment.Therefore,silicone rubber(SR)is used as the matrix and hollow glass microsphere(HGM)is used as filler to prepare a series of flexible buoyancy materials(FBMs).Meanwhile,the morphology of the flexible buoyancy material was observed and analyzed by scanning electron microscope,and the impurity phase-bubbles and broken HGMs were found in the micrograph.Considering the possible influence of impurity phase on material properties,the total content of impurity phase and the content of single component in it are calculated by digital image processing method,and the impurity phase is included in one of the influencing factors of material properties.The calculation formula of impurity phase content in materials is put forward.The density of materials is studied by theoretical calculation method.The hardness of materials is studied by simulation analysis method,and the elastic modulus of materials is studied by theoretical calculation and simulation analysis method.The main research contents of this paper are as follows:(1)The flexible buoyancy material was prepared by SR and HGM.The surface of FBMs is smooth and the resilience is strong.When the mass fraction of HGM in the material is high(more than 20%),the decrease of SR content will lead to the poor fluidity of HGM in SR,which will affect the adhesion of SR and HGMs.The times of agitation and bubble-removal process need to be increased during the preparation.From the point of view of raw materials,the modified SR can reduce its viscosity and increase its operation time,which is helpful for the mixing of SR and HGMs.(2)The micro morphology of the FBMs were observed by SEM and analyzed.The content of impurity phase in the FBMs was calculated by digital image processing(DIP)method.The higher the magnification of the micrograph,the higher the processing precision,but the error of the processing result will be larger.It is reasonable to process the picture with 200 X magnification.When processing the micrographs,the lower the tool pixel and the more samples are taken,the smaller the operation error will be.The calculation of impurity phase content by DIP method is only applicable to the materials with low mass fraction of HGM.When the mass fraction of HGM in the FBMs is high,the sampling points need to be increased to reduce the impact of contingency.(3)The hardness of the FBMs was analyzed by micro-unit method.The results showed that the broken HGM is the main factor affecting the hardness.The error of the calculation results of the theoretical prediction model of elastic modulus depends on the data group used.The best data combination was obtained after the calculation of different data groups,and the theoretical prediction formula suitable for the elastic modulus of FBMs in this paper was obtained.The maximum error is 16.1%.