The rolling treatment of steel-mushy QTi3.5-3.5 graphite composite was conducted under different relative reduction at room temperature. The effect of room-temperature rolling on interracial mechanical property of ste...The rolling treatment of steel-mushy QTi3.5-3.5 graphite composite was conducted under different relative reduction at room temperature. The effect of room-temperature rolling on interracial mechanical property of steel-mushy QTi3.5-3.5 graphite composite was studied and the relationship between interracial shear strength and relative reduction was established. The results show that, for steel-mushy QTi3.5-3.5 graphite composite, which consists of 1.2 mm-thick 08AI steel plate and 2.8 mm-thick QTi3.5-3.5 graphite layer, there is a nonlinear relationship between interracial shear strength and relative reduction in graphite layer. When relative reduction is smaller than 1.1%,interracial shear strength increases with increasing the relative reduction. When relative reduction is larger than 1.1%, interracial shear strength decreases with increasing the relative reduction. When relative reduction is 1.1%,the largest interracial shear strength of 145.2 MPa can be obtained.展开更多
The bonding of steel plate with QTi3.5-3.5 graphite slurry was studied by using pressing bonding technique. The influence of pressing time on the interracial mechanical property of bonding plate was researched. The re...The bonding of steel plate with QTi3.5-3.5 graphite slurry was studied by using pressing bonding technique. The influence of pressing time on the interracial mechanical property of bonding plate was researched. The results show that： under the conditions of 620℃ preheating temperature of steel plate, 530℃ preheating temperature of dies, 46% solid fraction of QTi3.5-3.5 graphite slurry and 50 MPa pressure, there exists a nonlinear relationship between pressing time and interracial shear strength. The interracial shear strength of bonding plate increases with increasing pressing time and reaches a largest value about 127 MPa when pressing time is longer than 120 s. At the interface with the best mechanical property, there exists a continuous Fe-Cu inter-diffusion zone and a metallurgical bonding.展开更多
Dear Editor,Swine major histocompatibility complex(MHC)is a highly polymorphic gene in pigs and is also called swine leukocyte antigen(SLA)(Fan et al.,2018).SLA is divided into three major categories,SLA I(SLA-1,-2,-3...Dear Editor,Swine major histocompatibility complex(MHC)is a highly polymorphic gene in pigs and is also called swine leukocyte antigen(SLA)(Fan et al.,2018).SLA is divided into three major categories,SLA I(SLA-1,-2,-3),SLA II,and SLA III(Smith et al.,2005).SLA I plays an important role in cellular immunity which can eliminate viruses and other foreign antigens in pigs(Macdonald et al.,2010).SLA-1,SLA-2 and SLA-3 are important SLA I alleles and are highly polymorphic.Polymorphism causes extreme difficulties in screening broadly protective cytotoxic lymphocyte(CTL)epitope antigens.The supertype which is built based on peptide-binding specificity of each SLA I can overcome this difficulty to some extent(Thomsen et al.,2013).展开更多
基金supported by the National Natural Science Foundation of China(Nos.50274047 and 50304001)the Ministry of Education of PRC FoundationBeijing Jiaotong University Foundation
文摘The rolling treatment of steel-mushy QTi3.5-3.5 graphite composite was conducted under different relative reduction at room temperature. The effect of room-temperature rolling on interracial mechanical property of steel-mushy QTi3.5-3.5 graphite composite was studied and the relationship between interracial shear strength and relative reduction was established. The results show that, for steel-mushy QTi3.5-3.5 graphite composite, which consists of 1.2 mm-thick 08AI steel plate and 2.8 mm-thick QTi3.5-3.5 graphite layer, there is a nonlinear relationship between interracial shear strength and relative reduction in graphite layer. When relative reduction is smaller than 1.1%,interracial shear strength increases with increasing the relative reduction. When relative reduction is larger than 1.1%, interracial shear strength decreases with increasing the relative reduction. When relative reduction is 1.1%,the largest interracial shear strength of 145.2 MPa can be obtained.
基金This project is supported by the National Natural Science Foundation of China(Nos.50274047 and 50304001)the Natural Science Foundation of Beijing+1 种基金the Ministry of Education of PRC Foundationthe Beijing Jiaotong University Foundation.
文摘The bonding of steel plate with QTi3.5-3.5 graphite slurry was studied by using pressing bonding technique. The influence of pressing time on the interracial mechanical property of bonding plate was researched. The results show that： under the conditions of 620℃ preheating temperature of steel plate, 530℃ preheating temperature of dies, 46% solid fraction of QTi3.5-3.5 graphite slurry and 50 MPa pressure, there exists a nonlinear relationship between pressing time and interracial shear strength. The interracial shear strength of bonding plate increases with increasing pressing time and reaches a largest value about 127 MPa when pressing time is longer than 120 s. At the interface with the best mechanical property, there exists a continuous Fe-Cu inter-diffusion zone and a metallurgical bonding.
基金Financed by the National Key R&D Program of China(2017YFD0502302)National 12th Five-Year Plan Science and Technology Support Project(2015BAD12B01-06).
文摘Dear Editor,Swine major histocompatibility complex(MHC)is a highly polymorphic gene in pigs and is also called swine leukocyte antigen(SLA)(Fan et al.,2018).SLA is divided into three major categories,SLA I(SLA-1,-2,-3),SLA II,and SLA III(Smith et al.,2005).SLA I plays an important role in cellular immunity which can eliminate viruses and other foreign antigens in pigs(Macdonald et al.,2010).SLA-1,SLA-2 and SLA-3 are important SLA I alleles and are highly polymorphic.Polymorphism causes extreme difficulties in screening broadly protective cytotoxic lymphocyte(CTL)epitope antigens.The supertype which is built based on peptide-binding specificity of each SLA I can overcome this difficulty to some extent(Thomsen et al.,2013).
