A new β-Ti based Ti35Nb2.5Sn/10 hydroxyapitite（HA） biocompatible composite was fabricated by mechanical milling and pulsed current activated sintering（PCAS）.The microstructures of Ti35Nb2.5Sn/10HA powder particle...A new β-Ti based Ti35Nb2.5Sn/10 hydroxyapitite（HA） biocompatible composite was fabricated by mechanical milling and pulsed current activated sintering（PCAS）.The microstructures of Ti35Nb2.5Sn/10HA powder particles and composites sintered from the milled powders were studied.Results indicated that α-Ti phase began to transform into β-Ti phase after the powders were mechanically milled for 8 h.After mechanical milling for 12 h,α-Ti completely transformed into β-Ti phase,and the ultra fine Ti35Nb2.5Sn/10HA composite powders were obtained.And ultra fine grain sized Ti35Nb2.5Sn/10HA sintered composites were obtained by PCAS.The hardness and relative density of the sintered composites both increased with increasing the ball milling time.展开更多
The present work discusses a systematic approach to model grinding parameters of coal in a ball mill. A three level Box-Behnken design combined with response surface methodology using second order model was applied to...The present work discusses a systematic approach to model grinding parameters of coal in a ball mill. A three level Box-Behnken design combined with response surface methodology using second order model was applied to the experiments done according to the model requirement. Three parameters ball charge （numbers 10-20）, coal content （100-200 g） and the grinding time （4-8 rain） were chosen for the experiments as well as for the modeling work. Coal fineness is defined as the dso （80 % passing size）. A quadratic model was developed to show the effect of parameters and their interaction with fineness of the product. Three different sizes （4, 1 and 0.65 mm） of Indian coal were used. The model equations for each fraction were developed and different sets of experiments were performed. The predicted values of the fineness of coal were in good agreement with the experimental results （R2 values of dso varies between 0.97 and 0.99）. Fine size of three different coal sizes were obtained with larger ball charge with less grinding time and less solid content. This work represents the efficient use of response surface methodology and the Box-Behnken design use for grinding of Indian coal.展开更多
基金Project(ZJY0605-02) supported by the Natural Science Foundation of Heilongjiang Province,ChinaProject(310703002) supported by the National Research Foundation of Korea(NRF) grant funded Korea Government
文摘A new β-Ti based Ti35Nb2.5Sn/10 hydroxyapitite（HA） biocompatible composite was fabricated by mechanical milling and pulsed current activated sintering（PCAS）.The microstructures of Ti35Nb2.5Sn/10HA powder particles and composites sintered from the milled powders were studied.Results indicated that α-Ti phase began to transform into β-Ti phase after the powders were mechanically milled for 8 h.After mechanical milling for 12 h,α-Ti completely transformed into β-Ti phase,and the ultra fine Ti35Nb2.5Sn/10HA composite powders were obtained.And ultra fine grain sized Ti35Nb2.5Sn/10HA sintered composites were obtained by PCAS.The hardness and relative density of the sintered composites both increased with increasing the ball milling time.
文摘The present work discusses a systematic approach to model grinding parameters of coal in a ball mill. A three level Box-Behnken design combined with response surface methodology using second order model was applied to the experiments done according to the model requirement. Three parameters ball charge （numbers 10-20）, coal content （100-200 g） and the grinding time （4-8 rain） were chosen for the experiments as well as for the modeling work. Coal fineness is defined as the dso （80 % passing size）. A quadratic model was developed to show the effect of parameters and their interaction with fineness of the product. Three different sizes （4, 1 and 0.65 mm） of Indian coal were used. The model equations for each fraction were developed and different sets of experiments were performed. The predicted values of the fineness of coal were in good agreement with the experimental results （R2 values of dso varies between 0.97 and 0.99）. Fine size of three different coal sizes were obtained with larger ball charge with less grinding time and less solid content. This work represents the efficient use of response surface methodology and the Box-Behnken design use for grinding of Indian coal.
