The FTP200 flake tantalum powder was introduced.The microstructures of the powder with leaf-like primary particles having an average flakiness of 2 to 20 and porous agglomerated particles were observed.The chemical co...The FTP200 flake tantalum powder was introduced.The microstructures of the powder with leaf-like primary particles having an average flakiness of 2 to 20 and porous agglomerated particles were observed.The chemical composition,physical properties,and electrical properties of the FTP200 powder were compared with those of the FTW300 nodular powder.The FTP200 powder is more sinter-resistant,and the surface area of the flake tantalum powder under sintering at high temperature has less loss than that of the nodular tantalum powder.The specific capacitance of the flake tantalum powder is higher than that of the nodular tantalum powder with the same surface area when anodized at high voltage.Thus,the flake tantalum powder is suitable for manufacturing tantalum solid electrolytic capacitors in the range of median and high（20-63 V） voltages.展开更多
Tantalum nitride powders with particle size of 20-50 nm were prepared by the homogeneous reduction in liquid ammonia,and were treated at the temperature range from 500 ℃ to 1 170 ℃. The results of XRD analysis indic...Tantalum nitride powders with particle size of 20-50 nm were prepared by the homogeneous reduction in liquid ammonia,and were treated at the temperature range from 500 ℃ to 1 170 ℃. The results of XRD analysis indicate that the powders heated up to 500 ℃ are in the form of amorphous. The powder heated at 600 ℃ tends to transform into crystal,the powder heated to temperatures higher than 700 ℃ is clearly of crystal. The results of surface area analysis by BET show that the surface area of the powder increases as the heating temperature increases,and reaches a maximum value of 21.8 m2/g at the heating temperature around 700 ℃.展开更多
The history and the evolvement of tantalum powder and wire production in Ningxia Nonferrous Metals Smelter (NNMS) was described. The technology and main characteristics of tantalum products were also concluded. It is ...The history and the evolvement of tantalum powder and wire production in Ningxia Nonferrous Metals Smelter (NNMS) was described. The technology and main characteristics of tantalum products were also concluded. It is indicated that these products are competitive in the international market.展开更多
文摘The FTP200 flake tantalum powder was introduced.The microstructures of the powder with leaf-like primary particles having an average flakiness of 2 to 20 and porous agglomerated particles were observed.The chemical composition,physical properties,and electrical properties of the FTP200 powder were compared with those of the FTW300 nodular powder.The FTP200 powder is more sinter-resistant,and the surface area of the flake tantalum powder under sintering at high temperature has less loss than that of the nodular tantalum powder.The specific capacitance of the flake tantalum powder is higher than that of the nodular tantalum powder with the same surface area when anodized at high voltage.Thus,the flake tantalum powder is suitable for manufacturing tantalum solid electrolytic capacitors in the range of median and high（20-63 V） voltages.
基金Project(2003AA302430) supported by the National Hi-tech Research and Development Program of Chinaproject(50374007) supported by the National Natural Science Foundation of China
文摘Tantalum nitride powders with particle size of 20-50 nm were prepared by the homogeneous reduction in liquid ammonia,and were treated at the temperature range from 500 ℃ to 1 170 ℃. The results of XRD analysis indicate that the powders heated up to 500 ℃ are in the form of amorphous. The powder heated at 600 ℃ tends to transform into crystal,the powder heated to temperatures higher than 700 ℃ is clearly of crystal. The results of surface area analysis by BET show that the surface area of the powder increases as the heating temperature increases,and reaches a maximum value of 21.8 m2/g at the heating temperature around 700 ℃.
文摘The history and the evolvement of tantalum powder and wire production in Ningxia Nonferrous Metals Smelter (NNMS) was described. The technology and main characteristics of tantalum products were also concluded. It is indicated that these products are competitive in the international market.
基金the financial supports from the Guangzhou Municipal Science and Technology Project,China(No.202206010030)the Key R&D Program of Guangdong Province,China(No.2019B090904001)。
