| Piston,as one of the important components of automobile engines,bears high wear and working temperature.In order to meet the requirements of modern high-performance and complex vehicle operating conditions,it is urgent to explore new high-performance and strong wear-resistant piston materials and their preparation Molding.In recent years,the use of aluminum alloy instead of other materials as the base material of engine pistons has become an important direction and hotspot in the study of piston materials.At the same time,particle-reinforced metal composite materials can significantly improve the comprehensive mechanical properties of the substrate.Among them,metal glass is expected to obtain better composite material reinforcement effects due to its unique mechanical,physical,and chemical properties.In order to further improve the wear resistance of the piston material,this paper uses gas atomization technology to prepare Ti57Zri3Cu21Ni9 amorphous metallic glass powder,and explores the amorphization process of the powder,and the prepared Ti57Zr13Cu21Ni9 amorphous metallic glass powder is processed separately Microscopic morphology,phase structure,chemical composition,element distribution test and characterization.In addition,the research uses spark plasma sintering technology to prepare Ti57Zri3Cu2iNi9 particle-reinforced ZL109 aluminum matrix composites,and systematically studies the microstructure,element composition and distribution,and mechanical behavior of the composites to explore the effect of Ti57Zri3Cu21Ni9 reinforcements on the composites.The impact of structure and mechanical properties,and further characterize the wear resistance of the prepared new aluminum-based composites,and analyze its wear-reducing and wear-resistant mechanism.The main research contents of this paper are as follows:(1)The Ti57Zr13Cu21Ni9 amorphous metallic glass powder was prepared by gas atomization technology,and the microscopic morphology,micro-area composition,element distribution and phase structure of the Ti57Zr13Cu21Ni9 amorphous metallic glass powder were tested and analyzed.The results show that after gas atomization,the size and shape of the prepared powder have changed significantly,and Ti57Zr13Cu21Ni9 amorphous metallic glass powder with better dispersion and uniform size can be effectively prepared,and the amorphization is the cause of its mechanical properties.The reason for the significant increase.(2)Using spark plasma sintering technology,by adjusting the sintering process parameters and the Ti57Zr13Cu21Ni9 reinforcement mass fraction,Ti57Zr13Cu21Ni9/ZL 109 composite materials with different reinforcement contents were prepared,and the microscopic morphology,micro-area element composition and elemental composition of the composite material were prepared.The distribution and its mechanical properties are analyzed.Studies have shown that when the mass fraction of the reinforcement is 9wt%,the interface between the Ti57Zr13Cu21Ni9 particles and the ZL109 matrix material is well bonded,and the hardness of the aluminum matrix composite material is the best under this condition,up to 140HV.Compared with the ZL109 aluminum alloy matrix,the composite Material hardness increased by 56%.This is because Ti57Zr13Cu21Ni9 amorphous metallic glass particles are uniformly distributed in the ZL109 aluminum alloy matrix,and metallic glass plays an excellent role in enhancing the dispersion.(3)Through the friction and wear experiment of different metal glass additions on Ti57Zr13Cu21Ni9/ZL109 aluminum matrix composites,the wear rate and friction coefficient of various materials under different loads,sliding frequencies,and temperatures were compared and analyzed,and the wear surface morphology was further analyzed The wear mechanism under different experimental conditions was explored.Studies have shown that the friction coefficient of aluminum matrix composites decreases first and then increases with the increase of Ti57Zr13Cu21Ni9 content.When the amount of metallic glass added is 9wt%,the friction coefficient is the lowest at this time,und the friction coefficient drops to 0,6972.Compared with ZL109 aluminum alloy matrix,the friction coefficient is 24,37%lower.This is because as the content of metallic glass reinforcement increases,metallic glass exerts a better reinforcing effect,and the friction coefficient gradually decreases,At the same time,the wear rate of aluminum matrix composites shows a trend of first decreasing and then increasing with the increase of Ti57r13Cu21Ni9 content.With the increase in the amount of Ti57Zr13Cu21Ni9 metallic glass,the structure of the composite material has been refined,its mechanical properties are more prominent,and the wear resistance has been correspondingly improved.Finally,the thesis systematically analyzes and expounds the wear mechanism of the piston composite material corresponding to different metal glass additions under different load,sliding frequency,temperature and other friction conditions. |
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