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EFFECT OF BALL MILLING TIME ON MICROSTRUCTURE AND PROPERTIES OF Al_2O_3/Mo COMPOSITE MATERIAL

Liujie Xu

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Abstract

Al2O3/Mo composite powder was prepared by sol-gel,high-energy ball milling was used to refining the grain size of alumina and molybdenum of Al2O3/Mo composite material,the effect of ball milling time on the microstructure and properties of Al2O3/Mo composite was studied.The microstructure of composite powder and composite material prepared with different process were observed and analyzed by X-ray diffraction and scanning electron microscopy.The results show that with the increase of milling time,the particle shape experiences a transformation from sphericality to flakeiness to sphericality,the particle size of powder decreases gradually,the size of alumina and molybdenum decreases,the particle size of alumina is about 500nm after 60 hours of ball milling;the density of composite material increases at first then decreases gradually,but microhardness rises to 403.2 HV gradually.

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What this paper is about

Al2O3/Mo composite powder was prepared by sol-gel,high-energy ball milling was used to refining the grain size of alumina and molybdenum of Al2O3/Mo composite material,the effect of ball milling time on the microstructure and properties of Al2O3/Mo composite was studied.The microstructure of composite powder and composite material prepared with different process were observed and analyzed by X-ray diffraction and scanning electron microscopy.The results show that with the increase of milling time,the particle shape experiences a transformation from sphericality to flakeiness to sphericality,the particle size of powder decreases gradually,the size of alumina and molybdenum decreases,the particle size of alumina is about 500nm after 60 hours of ball milling;the density of composite material increases at first then decreases gradually,but microhardness rises to 403.2 HV gradually.

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Available abstract

Al2O3/Mo composite powder was prepared by sol-gel,high-energy ball milling was used to refining the grain size of alumina and molybdenum of Al2O3/Mo composite material,the effect of ball milling time on the microstructure and properties of Al2O3/Mo composite was studied.The microstructure of composite powder and composite material prepared with different process were observed and analyzed by X-ray diffraction and scanning electron microscopy.The results show that with the increase of milling time,the particle shape experiences a transformation from sphericality to flakeiness to sphericality,the particle size of powder decreases gradually,the size of alumina and molybdenum decreases,the particle size of alumina is about 500nm after 60 hours of ball milling;the density of composite material increases at first then decreases gradually,but microhardness rises to 403.2 HV gradually.

Key concepts: Materials science, Microstructure, Ball mill, Composite number, Particle size, Scanning electron microscope, Grain size, Indentation hardness

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EFFECT OF BALL MILLING TIME ON MICROSTRUCTURE AND PROPERTIES OF Al_2O_3/Mo COMPOSITE MATERIAL — Research Paper | ScholarLens