Sintering additives and micro-powder injection molding offer an effective method to densify boron carbide(B_(4)C)and make B_(4)C components with complex shapes.By adjusting the proportion of three kinds of powders(SiC...Sintering additives and micro-powder injection molding offer an effective method to densify boron carbide(B_(4)C)and make B_(4)C components with complex shapes.By adjusting the proportion of three kinds of powders(SiC,Al_(2)O_(3)and Y_(2)O_(3)),four kinds of sintering additives were prepared.The feedstock uniformity,debinding behavior,phase composition and microstructure of micro injection molded B_(4)C components with different sintering additives were studied.The results showed that the defects such as lattice distortion and vacancy were introduced into ball milling,which increase the surface energy and benefit subsequent sintering densification.The feedstock had good uniformity and rheology that met the requirements of micro powder injection molding.After debinding,B_(4)C components had enough strength and showed certain sintering characteristics.The addition of sintering additives was beneficial to densification and sintering temperature reduction.The addition of sintering additives formed a second phase in the B_(4)C crystal and at the grain boundary of B_(4)C crystal,which changed the fracture mode from transgranular fracture to mixed fracture mechanism with transgranular fracture.展开更多
Motor biofuel is one kind of clean and sustainable fuel extracted from living organisms or obtained by the transformation of organisms,which can be used to replace fossil fuels.Nowadays,motor biofuel is an important d...Motor biofuel is one kind of clean and sustainable fuel extracted from living organisms or obtained by the transformation of organisms,which can be used to replace fossil fuels.Nowadays,motor biofuel is an important direction for the development and utilization of renewable energy.More attention has been given to the development and promotion of motor biofuel and relative technologies all over the world.This research introduced the history of motor biofuel,the classification of motor biofuel as well as the strategies and policies made domestically and internationally in order to promote the development of motor biofuel,and also pointed out some of the urgent problems faced during the development of motor biofuels and put forward some suggestions for the future development of motor biofuel in China.展开更多
基金supported by the National Natural Science Foundation of China(Grant No.52075250)the China Postdoctoral Science Foundation(No.2020M683376)the National Key Laboratory of Science and Technology on Helicopter Transmission(No.HTL-O-19G09)。
文摘Sintering additives and micro-powder injection molding offer an effective method to densify boron carbide(B_(4)C)and make B_(4)C components with complex shapes.By adjusting the proportion of three kinds of powders(SiC,Al_(2)O_(3)and Y_(2)O_(3)),four kinds of sintering additives were prepared.The feedstock uniformity,debinding behavior,phase composition and microstructure of micro injection molded B_(4)C components with different sintering additives were studied.The results showed that the defects such as lattice distortion and vacancy were introduced into ball milling,which increase the surface energy and benefit subsequent sintering densification.The feedstock had good uniformity and rheology that met the requirements of micro powder injection molding.After debinding,B_(4)C components had enough strength and showed certain sintering characteristics.The addition of sintering additives was beneficial to densification and sintering temperature reduction.The addition of sintering additives formed a second phase in the B_(4)C crystal and at the grain boundary of B_(4)C crystal,which changed the fracture mode from transgranular fracture to mixed fracture mechanism with transgranular fracture.
基金This study was financially supported by the joint projects of the Doctoral Research Fund of Shandong Jianzhu University(Grant No.X18042Z)the National Natural Science Foundation of China(Grant No.51806242)the Open Research Fund Program of Key Laboratory of Cleaner Production and Integrated Resource Utilization of China National Light Industry(Grant No.CP-2020-YB11).
文摘Motor biofuel is one kind of clean and sustainable fuel extracted from living organisms or obtained by the transformation of organisms,which can be used to replace fossil fuels.Nowadays,motor biofuel is an important direction for the development and utilization of renewable energy.More attention has been given to the development and promotion of motor biofuel and relative technologies all over the world.This research introduced the history of motor biofuel,the classification of motor biofuel as well as the strategies and policies made domestically and internationally in order to promote the development of motor biofuel,and also pointed out some of the urgent problems faced during the development of motor biofuels and put forward some suggestions for the future development of motor biofuel in China.
