Preparation And Properties Research Of Morphology-material Coupled Bionic Anti-erosion Functional Surface

Erosion refers to the material surface quality degrades due to the material surface suffers from small and loose flowing particles impact.It will reduce the reliability and the service life of the equipment.According to many statistical cases,China's annual economic loss due to wear is up to 40 billion yuan,and erosion proportion is up to 8%.Erosion can not only cause material wear,energy consumption,and economic loss,but also can be fatal in some fields,such as complex working conditions and high requirements for equipment reliability.It can be seen that reducing the damage caused by erosion is an important issue to be solved urgently in engineering practice.At present,to overcome the problem of erosion,scholars have developed many methods such as material modification,surface coating,composite materials,and optimized design to improve the erosion resistance of materials.Although the above schemes have been widely applied in many industrial fields,some major problems caused by erosion in various fields have not been solved perfectly.From the perspective of bionics,the study of bionic erosion resistance can provide a new solution for problems of erosion resistance.After millions of years of evolution,the biological features of the biological surface have already evolved the optimal combination under a specific living environment.Studying the biological features of biological surfaces can open up a shortcut for preparing anti-erosion surfaces.Sandstorm weather is frequent in the desert.Under the long-term erosion of sandstorm,creatures living in the desert have evolved biological characteristics that can resist sandstorm abrasion,which make the creatures in the desert have excellent erosion resistance performance.These biological characteristics provide new inspiration and new references for the study of material erosion resistance.In this paper,a biomimetic model of morphology-material coupled anti-erosion was established based on Parabuthus transvaalicus and Tamarisk,two typical desert-living organisms.A method for fabricating large-area biomimetic anti-erosion surfaces with coupled morphology-material was put forward,and its basic properties were tested.The numerical simulation of the erosion process influenced with morphology-material coupled biomimetic anti-erosion functional surface was completed.Erosion tests of morphology-material coupled biomimetic anti-erosion functional surface were carried out,and the anti-erosion mechanism of the morphology-material coupled biomimetic anti-erosion functional surface was revealed.The main contents of this paper are as follows:(1)Design and optimization of the morphology-material coupled bionic anti-erosion model.Based on the previous research,the erosion resistance characteristics of the two species were further analyzed,and the morphology-material coupled bionic anti-erosion models of the two species were established.Combined with the principle of coupled bionics,a parallel optimization design scheme of the bionic model is proposed.According to the actual requirement of engineering,a new type of bionic anti-erosion model with morphology-material coupling was established.At the same time,the size parameters of the morphology-material coupled bionic anti-erosion model were designed.(2)Preparation and basic performance tests of the morphology-material coupled bionic antierosion functional surface.To meet the requirements of large-area and precise size preparation,a new morphology-material coupled bionic anti-erosion functional surface preparation method was put forward.This method can be divided into two stages: the grooves surface morphology preparation stage by wire cutting process and the convex hull surface morphology and heterogeneous materials preparation stage by electroplating technology.Concurrently,the prepared functional surfaces of the morphology-material coupled bionic anti-erosion were tested including coating crystal phase analysis,phase binding force,size of surface morphology,size of heterogeneous materials,coating micro-hardness and elastic modulus.The results showed that the newly developed preparation method can implement the accurate preparation of the morphology-material coupled bionic anti-erosion functional surface.(3)Numerical simulation of the morphology-material coupled bionic anti-erosion functional surface.Numerical simulation of hydrodynamics and transient dynamics was carried out for the erosion abrasion process of the morphology-material coupled bionic anti-erosion functional surface.The erosion process influenced by bionic surface morphology and heterogeneous materials was analyzed.Numerical simulation results of hydrodynamics show that the bionic surface morphology can change the flow field distribution and erosion particle velocity,but the single bionic surface morphology can only significantly improve the anti-erosion performance of the material when the gas-solid two-phase inflow angle is 20�,30�,and 40�.The results of transient dynamics numerical simulation show that the anti-erosion performance of heterogeneous materials can be improved at different incident angles of erosion particles,and the anti-erosion performance improvement effect of heterogeneous materials in convex hulls is better than that of heterogeneous materials in plane and groove parts.(4)Erosion tests and anti-erosion mechanism analysis of the morphology-material coupled bionic anti-erosion functional surface.The anti-erosion performance of the prepared morphology-material coupled bionic anti-erosion functional surface was tested.The test results show that prepared surfaces have good anti-erosion performance,the improvement rate of antierosion performance was different under different incident angles of gas-solid two phases,and the improvement range was 28.88%-50.96%.The analysis results of the micro-surface morphology after erosion showed that the grooves and convex hulls can obviously change the material loss type of the material surface,and affect the erosion process further.Meanwhile,the anti-erosion mechanism of the morphology-material coupled bionic anti-erosion functional surface was analyzed.During the different stages including before the contact,contact,and after the contact,the anti-erosion is achieved through the bionic surface morphology change erosion particles motion state and incident angles,the soft layer of heterogeneous materials can reduce the erosion abrasion energy of surface materials,and the hard layer of heterogeneous materials can improve the surface materials fracture performance that resistant to partial pressing or scratching,respectively.In different stages of erosion,the bionic surface morphology and heterogeneous materials were cooperated to achieve the effect that the anti-erosion performance of the material surface can be improved when the gas-solid two-phase flow angle is different.