The bonding quality of bronze/steel bimetallic laminated composite is the key factor to whether it can be used in poor working conditions.In this study,bimetallic billets were prepared by the protective atmosphere cas...The bonding quality of bronze/steel bimetallic laminated composite is the key factor to whether it can be used in poor working conditions.In this study,bimetallic billets were prepared by the protective atmosphere casting process.The microstructural characteristics,mechanical properties and interface bonding mechanism of the bronze/steel bimetallic composites were analyzed comprehensively through a series of microstructure analysis(inicluding OM,SEM,and EDS)and mechanical properties tests.The experimental results demonstrate that the vaporization of lead(Pb)element in the bronze is only 0.4%in weight,and alloy elements are diffused into both sides at the interface.Moreover,the hardness in the bronze region exceeds 100.0 HV which indicates excellent wear resistance.Tensile and shear tests indicate that the fractures mainly occur on the bronze side with the interaction of the brittle fracture of Pb particles and the ductile fracture of Cu-Sn solid solution.The maximum tensile strength and shear strength reach 204.0 MPa and 211.0 MPa,respectively.These results demonstrate that the protective atmosphere casting process is applicable for the preparation of bronze/steel bimetallic laminated composite with high quality.展开更多
The Zhang Paper Workshop preserving the complete traditional papermaking process has been praised by experts as “the living fossil of Chinese papermaking”. Due to the impact of industrial papermaking, however, the t...The Zhang Paper Workshop preserving the complete traditional papermaking process has been praised by experts as “the living fossil of Chinese papermaking”. Due to the impact of industrial papermaking, however, the traditional papermaking has gradually lost its market advantage, and the Zhang Paper Workshop prevailing for a time is already on the decline. In order to retain this precious cultural heritage, for more than 10 years, the Gleaners has spared no effort to provide various efforts to papermakers and has found a way out for the manual papermaking, and results have been achieved. How to protect and inherit the traditional papermaking process under the premise of conserving the ecological environment and maintaining the integrity of the papermaking process, and establish the Zhang Paper Workshop as a place for spreading the concept of nature conservation and cultural heritage protection is an urgent problem to be solved. This requires the support of policies, the investment of funds and the upgrading of technology, as well as the promotion of understanding and the cultivation of feelings.展开更多
文摘The bonding quality of bronze/steel bimetallic laminated composite is the key factor to whether it can be used in poor working conditions.In this study,bimetallic billets were prepared by the protective atmosphere casting process.The microstructural characteristics,mechanical properties and interface bonding mechanism of the bronze/steel bimetallic composites were analyzed comprehensively through a series of microstructure analysis(inicluding OM,SEM,and EDS)and mechanical properties tests.The experimental results demonstrate that the vaporization of lead(Pb)element in the bronze is only 0.4%in weight,and alloy elements are diffused into both sides at the interface.Moreover,the hardness in the bronze region exceeds 100.0 HV which indicates excellent wear resistance.Tensile and shear tests indicate that the fractures mainly occur on the bronze side with the interaction of the brittle fracture of Pb particles and the ductile fracture of Cu-Sn solid solution.The maximum tensile strength and shear strength reach 204.0 MPa and 211.0 MPa,respectively.These results demonstrate that the protective atmosphere casting process is applicable for the preparation of bronze/steel bimetallic laminated composite with high quality.
基金Sponsored by the National Social Science Fund of China(11CGL112)
文摘The Zhang Paper Workshop preserving the complete traditional papermaking process has been praised by experts as “the living fossil of Chinese papermaking”. Due to the impact of industrial papermaking, however, the traditional papermaking has gradually lost its market advantage, and the Zhang Paper Workshop prevailing for a time is already on the decline. In order to retain this precious cultural heritage, for more than 10 years, the Gleaners has spared no effort to provide various efforts to papermakers and has found a way out for the manual papermaking, and results have been achieved. How to protect and inherit the traditional papermaking process under the premise of conserving the ecological environment and maintaining the integrity of the papermaking process, and establish the Zhang Paper Workshop as a place for spreading the concept of nature conservation and cultural heritage protection is an urgent problem to be solved. This requires the support of policies, the investment of funds and the upgrading of technology, as well as the promotion of understanding and the cultivation of feelings.
