A synthesis method for the production of porous bulk metallic glass (BMG) was introduced. This method utilizes the su- perplastic forming ability of amorphous powder in the supercooled liquid (SCL) state and intenerat...A synthesis method for the production of porous bulk metallic glass (BMG) was introduced. This method utilizes the su- perplastic forming ability of amorphous powder in the supercooled liquid (SCL) state and intenerating salt mixture as a placeholder to produce BMG foam by using a hot die pressing method. Scanning electron microscope (SEM), X-ray diffraction (XRD) and dif- ferential scanning calorimetry (DSC) were employed to characterize the morphologies of foaming structure, the crystallization and the percentage of crystallization of the as-produced porous BMG. The results suggested that the formation of porous structure by su- perplastic forming process is feasible. Good bonding effect was observed between amorphous powder particles. Less than 6.5% of crystalline phases were formed during hot pressing, and less than 5.5% of residual salt was enclosed in the foam. To remove any re- sidual salt particles, salt preforms with three-dimensional network and good connectivity is necessary.展开更多
Castable glass ceramics based on SiO 2-Al 2O 3-K 2O-Na 2O system were prepared. The structure and physical properties of this material were tested and analyzed by x-ray, SEM and other methods. It was show that the maj...Castable glass ceramics based on SiO 2-Al 2O 3-K 2O-Na 2O system were prepared. The structure and physical properties of this material were tested and analyzed by x-ray, SEM and other methods. It was show that the major crystalline phase is leucite(KalSi 2O 6) and compressive and flexible strength is 420 MPa and 102 MPa respectively. Its character is almost similar to natural dental enamel. This material is an ideal dental repair material. The biological tests show that this material has a good biocompatibility and prospectives for developing.展开更多
A numerical simulation model for predicting residual stresses which arise during the solidification process of pressed glass bulb panel was developed. The solidification of a molten layer of glass between cooled paral...A numerical simulation model for predicting residual stresses which arise during the solidification process of pressed glass bulb panel was developed. The solidification of a molten layer of glass between cooled parallel plates was used to model the mechanics of the buildup of residual stresses in the forming process. A thermorheologically simple thermoviscoelastic model was assumed for the material. The finite element method employed was based on the theory of shells as an assembly of flat elements. This approach calculates residual stresses layer by layer like a truly three-dimensional calculation, which is well suited for thin pressed products of complex shape. An experimental comparison was employed to verify the proposed models and methods.展开更多
In the hollow glass industry, the success of the forming process depends on controlling the thermal exchange at the glass/mold interface to prevent defects on the glass surface. In the manufacturing process for luxury...In the hollow glass industry, the success of the forming process depends on controlling the thermal exchange at the glass/mold interface to prevent defects on the glass surface. In the manufacturing process for luxury perfume bottles, the current practice is to deposit a resin film on the inner faces of the mold at the beginning of the production process and regularly swab the mold with a lubricating paste. This study presents a new way to analyze the impact of lubrica- tion on glass/tool thermal exchanges. The TEMPO Laboratory (Valenciennes, France) has an experimental Glass/Tool Interaction (GTI) platform, which is a reduced-scale production unit that allows researchers to reproduce the pressing cycle conditions encountered in the glass industry. To complete the analysis of the thermal exchange at the glass/tool interface, the BCR Center (Mons, Belgium) took physico-chemical measurements on the produced glass samples after the trials on the GTI platform. Part A presents the experimental conditions on the GTI platform and the thermal analy- sis with this platform for the first case of flint glass pressing cycles with a punch swabbed with a lubricating paste de- veloped by our partner, SOGELUB? Special Lubricants Company (Marquain, Belgium). The analysis of the phys- ico-chemical changes on the pressed glass samples produced with the swabbed punch were completed with our obser- vations using a Scanning Electron Microscope (SEM) with Energy Dispersive Spectroscopy (EDS).展开更多
In the hollow glass industry, more specifically in the luxury perfume glass bottle industry, the success of the forming process depends on controlling the thermal exchange at the glass/mold interface to prevent defect...In the hollow glass industry, more specifically in the luxury perfume glass bottle industry, the success of the forming process depends on controlling the thermal exchange at the glass/mold interface to prevent defects on the glass surface. This study concerns a new way to analyze the impact of lubrication on the glass/tool thermal exchanges. It combines the thermal analysis on the experimental Glass/Tool Interaction (GTI) platform in the TEMPO Laboratory (Valenciennes, France) and the Physico-Chemical measurements on the glass samples by the BCR Center (Mons, Belgium). Part B presents the analysis of the flint glass pressing cycles using different punch lubrication conditions (i.e., bare punch, swabbed punch, coated punch, and coated/swabbed punch). The thermal analysis permits us to rank the lubrication conditions in terms of their capacity to limit the thermal exchange at the punch/glass interface. We defined a new lu- bricating paste composition based on the Physico-Chemical observations of the lubrication transfer on the pressed glass. The GTI platform results proves that the new composition does not affect the insulating power of the lubricating paste and permits us to eliminate defects on the glass samples that are not accepted in industrial situations.展开更多
基金This work was financially supported by the Fundamental Research Project of Shenyang Science and Technology Bureau, China (No. 061508).
文摘A synthesis method for the production of porous bulk metallic glass (BMG) was introduced. This method utilizes the su- perplastic forming ability of amorphous powder in the supercooled liquid (SCL) state and intenerating salt mixture as a placeholder to produce BMG foam by using a hot die pressing method. Scanning electron microscope (SEM), X-ray diffraction (XRD) and dif- ferential scanning calorimetry (DSC) were employed to characterize the morphologies of foaming structure, the crystallization and the percentage of crystallization of the as-produced porous BMG. The results suggested that the formation of porous structure by su- perplastic forming process is feasible. Good bonding effect was observed between amorphous powder particles. Less than 6.5% of crystalline phases were formed during hot pressing, and less than 5.5% of residual salt was enclosed in the foam. To remove any re- sidual salt particles, salt preforms with three-dimensional network and good connectivity is necessary.
文摘Castable glass ceramics based on SiO 2-Al 2O 3-K 2O-Na 2O system were prepared. The structure and physical properties of this material were tested and analyzed by x-ray, SEM and other methods. It was show that the major crystalline phase is leucite(KalSi 2O 6) and compressive and flexible strength is 420 MPa and 102 MPa respectively. Its character is almost similar to natural dental enamel. This material is an ideal dental repair material. The biological tests show that this material has a good biocompatibility and prospectives for developing.
基金Project supported by the National Natural Science Foundation of China (No.50205011)
文摘A numerical simulation model for predicting residual stresses which arise during the solidification process of pressed glass bulb panel was developed. The solidification of a molten layer of glass between cooled parallel plates was used to model the mechanics of the buildup of residual stresses in the forming process. A thermorheologically simple thermoviscoelastic model was assumed for the material. The finite element method employed was based on the theory of shells as an assembly of flat elements. This approach calculates residual stresses layer by layer like a truly three-dimensional calculation, which is well suited for thin pressed products of complex shape. An experimental comparison was employed to verify the proposed models and methods.
文摘In the hollow glass industry, the success of the forming process depends on controlling the thermal exchange at the glass/mold interface to prevent defects on the glass surface. In the manufacturing process for luxury perfume bottles, the current practice is to deposit a resin film on the inner faces of the mold at the beginning of the production process and regularly swab the mold with a lubricating paste. This study presents a new way to analyze the impact of lubrica- tion on glass/tool thermal exchanges. The TEMPO Laboratory (Valenciennes, France) has an experimental Glass/Tool Interaction (GTI) platform, which is a reduced-scale production unit that allows researchers to reproduce the pressing cycle conditions encountered in the glass industry. To complete the analysis of the thermal exchange at the glass/tool interface, the BCR Center (Mons, Belgium) took physico-chemical measurements on the produced glass samples after the trials on the GTI platform. Part A presents the experimental conditions on the GTI platform and the thermal analy- sis with this platform for the first case of flint glass pressing cycles with a punch swabbed with a lubricating paste de- veloped by our partner, SOGELUB? Special Lubricants Company (Marquain, Belgium). The analysis of the phys- ico-chemical changes on the pressed glass samples produced with the swabbed punch were completed with our obser- vations using a Scanning Electron Microscope (SEM) with Energy Dispersive Spectroscopy (EDS).
文摘In the hollow glass industry, more specifically in the luxury perfume glass bottle industry, the success of the forming process depends on controlling the thermal exchange at the glass/mold interface to prevent defects on the glass surface. This study concerns a new way to analyze the impact of lubrication on the glass/tool thermal exchanges. It combines the thermal analysis on the experimental Glass/Tool Interaction (GTI) platform in the TEMPO Laboratory (Valenciennes, France) and the Physico-Chemical measurements on the glass samples by the BCR Center (Mons, Belgium). Part B presents the analysis of the flint glass pressing cycles using different punch lubrication conditions (i.e., bare punch, swabbed punch, coated punch, and coated/swabbed punch). The thermal analysis permits us to rank the lubrication conditions in terms of their capacity to limit the thermal exchange at the punch/glass interface. We defined a new lu- bricating paste composition based on the Physico-Chemical observations of the lubrication transfer on the pressed glass. The GTI platform results proves that the new composition does not affect the insulating power of the lubricating paste and permits us to eliminate defects on the glass samples that are not accepted in industrial situations.
