20MnMo锻件管板带极堆焊304L的焊接试验

通过对20MnMo锻件管板带极堆焊304L的焊接试验及生产应用的研究,得出带极堆焊时合理选择过渡层焊接材料及堆焊各层的工艺规范参数是减小堆焊层合金元素稀释率、控制铁索体含量及保证堆焊质量的关键。     

Hydrothermal synthesis and luminescence properties of YW2O6（OH）3：Tb^3＋ green phosphors

YW2O6(OH)3:Tb3+ green phosphors were synthesized at different pH values via a facile hydrothermal method. The structure and optical properties of as-synthesized samples were studied by X-ray diffractometer (XRD), scanning electron microscopy (SEM), photolumi-nescence spectra and luminescence decay curve. The results showed that pure monoclinic YW2O6(OH)3:Tb3+ green phosphors could be ob-tained at pH 2-5. Uniform spherical micro-phosphors of ~5 μm in diameter with narrow size distribution could be prepared at pH 5. pH value had dramatic influence on morphologies, which could be ascribed to the various spatial configurations of different poly-tungstates existing at different pH values. The emission spectra under 261 nm excitation exhibited dominant green emission at 546 nm. The green emission inten-sity reached the maximum value at pH 5 due to the high packing density of the obtained phosphor.     

无尘固体冷却机换热板片制造工艺控制

介绍了无尘固体冷却机中的核心部件——换热板片材料的选用和要求,对换热板片的制造工艺流程进行了说明,主要包括:划线、进出水口成型、点焊点的焊接、外圈和折流焊道的焊接、进出水口接管的焊接、水压鼓胀成型等工序。通过采用合理的制作工序和焊接工艺,并借助水压鼓胀成型,制造出无尘固体冷却机换热板片,可以达到精度要求和使用要求。     

EuW206（OH）3荧光粉的水热法合成及发光性能

以Eu203和Na2w04·2H2O为原料,采用水热法合成了属纯单斜相结构的EuW2O6（0H）3红色荧光粉,分别采用XRD、FT-IR、SEM、PL测试手段对产物的物相组成、颗粒形貌和发光性能等进行了表征。结果表明,pH值对样品形貌有显著影响,pH=6时可以得到均匀规则的球状粉体。在394nm光的激发下,EuW2O6...     

EuW_2O_6(OH)_3荧光粉的水热法合成及发光性能

以Eu_2O_3和Na_2WO_4·2H_2O为原料,采用水热法合成了属纯单斜相结构的EuW_2O_6(OH)_3红色荧光粉,分别采用XRD、FT-IR、SEM、PL测试手段对产物的物相组成、颗粒形貌和发光性能等进行了表征。结果表明,pH值对样品形貌有显著影响,pH=6时可以得到均匀规则的球状粉体。在394nm光的激发下,EuW_2O_6(OH)_3荧光粉的617nm发射峰在pH=6时达到最大值。