The sintering technology for mixed powdered extrusion rods of different proportions of stainless steel to magnesia partially stabilized zirconia (PSZ) was investigated. The effects of some sintering parameters includi...The sintering technology for mixed powdered extrusion rods of different proportions of stainless steel to magnesia partially stabilized zirconia (PSZ) was investigated. The effects of some sintering parameters including holding time, atmosphere and protective gas pressure on shrinkage, relative density, microstructure, micro-Vickers hardness and compression strength of sintered samples were mainly researched. The experimental results are as follows: (1) The shrinkage and the relative density of the sintered samples decrease as increasing stainless steel content in the composite, except for the case containing 90 percent of stainless steel; (2) The porosity in PSZ matrix rises as increasing the stainless steel content in the composite; (3) Longer sintering holding time, higher sintering vacuum and gas-pressure sintering process not only enhance the relative density, but also improve microstructure of composite; (4) Micro-Vickers hardness of PSZ matrix decreases as increasing stainless steel content, while that of stainless steel particles in sintered samples varies unnoticeably.展开更多
Tungsten(W)is a promising candidate material for the plasma-facing components in future fusion reactors.However,it has issues regarding the intrinsic brittleness as well as operational embrittlement.Tungsten fiber rei...Tungsten(W)is a promising candidate material for the plasma-facing components in future fusion reactors.However,it has issues regarding the intrinsic brittleness as well as operational embrittlement.Tungsten fiber reinforced tungsten(W_(f)/W)composites overcome these issues by using extrinsic toughening mechanisms.Due to neutron irradiation and high-temperature recrystallization during fusion operation,the ductility of the fibers may degrade over a long period of service.Therefore,it is necessary to investigate the fracture behavior of W_(f)/W composites with brittle fibers.In the present work,the tungsten fibers were embrittled by carbonization.Subsequently,the continuous brittle W_(f)/W composite with yttrium oxide(Y_(2)O_(3))interface was fabricated by the field-assisted sintering technology process.The microstructure of the prepared W_(f)/W composites was characterized.The fracture behavior and toughening mechanisms were discussed in detail based on the experimental results of 3-point bending tests and the corresponding finite element simulation.The composites show a pseudo-ductile fracture behavior.Cracks are hindered and deflected by the de-bonded fiber-matrix interface.The extrinsic toughening mechanisms of interface de-bonding,crack bridging,and fiber pull-out are active.This indicates the reinforcement concept still works even though all components in the W_(f)/W are brittle.展开更多
Phlogopite glass ceramics can be made by powder sintering technology. This paper now studies the factors which affect properties of the sintered phlogopite glass ceramic by X-ray diffraction in qualitative and quanti...Phlogopite glass ceramics can be made by powder sintering technology. This paper now studies the factors which affect properties of the sintered phlogopite glass ceramic by X-ray diffraction in qualitative and quantitative way, and discusses the method improved the machinable properties of phlogopite glass ceramic. (Author abstract)展开更多
Sino magnetics technology is a high-tech enterprise specializing in R&D and production of rare earth permanent magnet materials.It is reported that the enterprise has accelerated the construction of annual3000 ton...Sino magnetics technology is a high-tech enterprise specializing in R&D and production of rare earth permanent magnet materials.It is reported that the enterprise has accelerated the construction of annual3000 tons of high performance sintered NdFeB production base,and the construction of the base has been completed and put into use.展开更多
A sintering technology for preparing porous materials from sea bottom sediments was developed for use in water purification. The purpose of the present study was to develop methods for converting the sea bottom sedime...A sintering technology for preparing porous materials from sea bottom sediments was developed for use in water purification. The purpose of the present study was to develop methods for converting the sea bottom sediments dredged from Ago Bay into value-added recycled products. The sintered products fabricated at 400℃ were found to be very effective adsorbents for the removal of heavy metals.展开更多
Yttria stabilized zirconia(YSZ)ceramics have been widely applied in areas of high-temperature thermal protection and nuclear radiation protection during the past decades.Both carbon nanotubes(CNTs)and graphene are reg...Yttria stabilized zirconia(YSZ)ceramics have been widely applied in areas of high-temperature thermal protection and nuclear radiation protection during the past decades.Both carbon nanotubes(CNTs)and graphene are regarded as highly ideal reinforcements for YSZ ceramics due to their natural excellent properties.However,is still a controversial topic how to make YSZ composites obtain better performance after adding CNTs and graphene.In particular,dispersion and sintering processes of CNTs and graphene in YSZ,are critical to the performance of the YSZ composites.So far,there is not a thorough analy-sis of the impact of CNTs and graphene on the mechanical characteristics and irradiation resistance of YSZ.Therefore,this paper focuses on the dispersion methods and sintering technologies of CNTs/YSZ and graphene/YSZ nanocomposites,as well as the mechanical properties and anti-irradiation properties.Fur-thermore,the potential applications are also prospected for CNTs/YSZ and graphene/YSZ nanocomposites.展开更多
文摘The sintering technology for mixed powdered extrusion rods of different proportions of stainless steel to magnesia partially stabilized zirconia (PSZ) was investigated. The effects of some sintering parameters including holding time, atmosphere and protective gas pressure on shrinkage, relative density, microstructure, micro-Vickers hardness and compression strength of sintered samples were mainly researched. The experimental results are as follows: (1) The shrinkage and the relative density of the sintered samples decrease as increasing stainless steel content in the composite, except for the case containing 90 percent of stainless steel; (2) The porosity in PSZ matrix rises as increasing the stainless steel content in the composite; (3) Longer sintering holding time, higher sintering vacuum and gas-pressure sintering process not only enhance the relative density, but also improve microstructure of composite; (4) Micro-Vickers hardness of PSZ matrix decreases as increasing stainless steel content, while that of stainless steel particles in sintered samples varies unnoticeably.
基金funded by the European Union via the Euratom Research and Training Programme(Grant Agreement No 101052200-EUROfusion)financially supported by the China Scholarship Council(CSC)(No.202007000034)。
文摘Tungsten(W)is a promising candidate material for the plasma-facing components in future fusion reactors.However,it has issues regarding the intrinsic brittleness as well as operational embrittlement.Tungsten fiber reinforced tungsten(W_(f)/W)composites overcome these issues by using extrinsic toughening mechanisms.Due to neutron irradiation and high-temperature recrystallization during fusion operation,the ductility of the fibers may degrade over a long period of service.Therefore,it is necessary to investigate the fracture behavior of W_(f)/W composites with brittle fibers.In the present work,the tungsten fibers were embrittled by carbonization.Subsequently,the continuous brittle W_(f)/W composite with yttrium oxide(Y_(2)O_(3))interface was fabricated by the field-assisted sintering technology process.The microstructure of the prepared W_(f)/W composites was characterized.The fracture behavior and toughening mechanisms were discussed in detail based on the experimental results of 3-point bending tests and the corresponding finite element simulation.The composites show a pseudo-ductile fracture behavior.Cracks are hindered and deflected by the de-bonded fiber-matrix interface.The extrinsic toughening mechanisms of interface de-bonding,crack bridging,and fiber pull-out are active.This indicates the reinforcement concept still works even though all components in the W_(f)/W are brittle.
文摘Phlogopite glass ceramics can be made by powder sintering technology. This paper now studies the factors which affect properties of the sintered phlogopite glass ceramic by X-ray diffraction in qualitative and quantitative way, and discusses the method improved the machinable properties of phlogopite glass ceramic. (Author abstract)
文摘Sino magnetics technology is a high-tech enterprise specializing in R&D and production of rare earth permanent magnet materials.It is reported that the enterprise has accelerated the construction of annual3000 tons of high performance sintered NdFeB production base,and the construction of the base has been completed and put into use.
文摘A sintering technology for preparing porous materials from sea bottom sediments was developed for use in water purification. The purpose of the present study was to develop methods for converting the sea bottom sediments dredged from Ago Bay into value-added recycled products. The sintered products fabricated at 400℃ were found to be very effective adsorbents for the removal of heavy metals.
基金financially supportedby the National Key R&D Pro-gram of China(No.2020YFB2007900)the National Science and Technology Major Project(No.2017-VI-0020-0093)the Open Foundation from the National Key Laboratory of Materials Behavior and Evaluation Technology in Space Environments.
文摘Yttria stabilized zirconia(YSZ)ceramics have been widely applied in areas of high-temperature thermal protection and nuclear radiation protection during the past decades.Both carbon nanotubes(CNTs)and graphene are regarded as highly ideal reinforcements for YSZ ceramics due to their natural excellent properties.However,is still a controversial topic how to make YSZ composites obtain better performance after adding CNTs and graphene.In particular,dispersion and sintering processes of CNTs and graphene in YSZ,are critical to the performance of the YSZ composites.So far,there is not a thorough analy-sis of the impact of CNTs and graphene on the mechanical characteristics and irradiation resistance of YSZ.Therefore,this paper focuses on the dispersion methods and sintering technologies of CNTs/YSZ and graphene/YSZ nanocomposites,as well as the mechanical properties and anti-irradiation properties.Fur-thermore,the potential applications are also prospected for CNTs/YSZ and graphene/YSZ nanocomposites.
