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
针对片式聚合物钽电容器在湿热环境中性能退化的问题,通过湿热贮存实验研究其电参数变化及结构变化,阐释其湿热敏感性。利用有限元法(Finite Element Method,FEM)模拟钽电容器在湿热环境下的应力分布,阐述其湿热敏感性机理。实验结果表...针对片式聚合物钽电容器在湿热环境中性能退化的问题,通过湿热贮存实验研究其电参数变化及结构变化,阐释其湿热敏感性。利用有限元法(Finite Element Method,FEM)模拟钽电容器在湿热环境下的应力分布,阐述其湿热敏感性机理。实验结果表明,在85℃/85%RH的湿热环境下,电容器电容量参数严重恶化,环氧塑封料中出现大量气孔,并在回流焊后电容器表面出现裂纹。仿真结果表明,在湿热和蒸汽压综合影响下,电容器钽棒出口处应力达45.73 MPa,是导致电容器失效的原因。而经120℃热处理24 h,电容器的电容量参数得到明显改善且回流焊后电容器的微观结构破坏程度较小,其可靠性提高。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.
文摘针对片式聚合物钽电容器在湿热环境中性能退化的问题,通过湿热贮存实验研究其电参数变化及结构变化,阐释其湿热敏感性。利用有限元法(Finite Element Method,FEM)模拟钽电容器在湿热环境下的应力分布,阐述其湿热敏感性机理。实验结果表明,在85℃/85%RH的湿热环境下,电容器电容量参数严重恶化,环氧塑封料中出现大量气孔,并在回流焊后电容器表面出现裂纹。仿真结果表明,在湿热和蒸汽压综合影响下,电容器钽棒出口处应力达45.73 MPa,是导致电容器失效的原因。而经120℃热处理24 h,电容器的电容量参数得到明显改善且回流焊后电容器的微观结构破坏程度较小,其可靠性提高。
