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    Freon free process for preparing a niobium activated yttrium tantalate X-ray phosphor
    6.
    发明授权
    Freon free process for preparing a niobium activated yttrium tantalate X-ray phosphor 失效
    制备铌活化钇钽酸锂X射线荧光粉的氟利昂自由法

    公开(公告)号：US4929385A

    公开(公告)日：1990-05-29

    申请号：US362720

    申请日：1989-06-07

    申请人： Vaddi B. Reddy

    发明人： Vaddi B. Reddy

    IPC分类号： C09K11/77 ,  C09K11/78

    CPC分类号： C09K11/7701

    摘要： A process is disclosed for preparing M' YTaO.sub.4 :Nb X-ray phosphor which comprises forming a uniform first mixture of Y.sub.2 O.sub.3, Ta.sub.2 O.sub.5, and Nb.sub.2 O.sub.5 in amounts equal to approximately the stoichiometric amounts to form the phosphor, milling with deionized water as the milling fluid, removing the water, forming a uniform second mixture of the first mixture and a flux which can be lithium sulfate, lithium chloride or a mix of lithium sulfate and potassium sulfate in a mole ratio of 80 to 20, the flux making up about 25% to 50% by weight of the second mixture, firing the second mixture in a furnace by heating to a temperature of about 1200.degree. C. to 1300.degree. C. at a heating rate of about 1.0.degree. C./minute to 1.5.degree. C./min. and maintaining the temperature for about 10 to 14 hours to react the components and produce a fired material containing luminescent material, cooling the material by turning off the heat and allowing the material to remain in the furnace until the temperature is no higher than about 300.degree. C., washing with deionized water, removing the wash water, drying, and classifying to obtain a -325 mesh particle size. The phosphor exhibits a brightness at least comparable to phosphors produced by methods absent water as the milling fluid.

    摘要翻译： 公开了一种用于制备M'YTaO 4：Nb X射线荧光体的方法，其包括以等于大约化学计量的量形成均匀的Y 2 O 3，Ta 2 O 5和Nb 2 O 5的第一混合物以形成荧光体，用去离子水作为研磨液 除去水，形成第一混合物的均匀的第二混合物和可以是硫酸锂，氯化锂或摩尔比为80至20的硫酸锂和硫酸钾混合物的助熔剂，助熔剂组成约25％ 至50重量％的第二混合物，通过以约1.0℃/分钟至1.5℃的加热速率加热至约1200℃至1300℃的温度在炉中焙烧第二混合物。 /分钟 并保持温度约10至14小时以使组分反应并产生含有发光材料的烧制材料，通过切断热量使材料冷却并使材料保留在炉中直到温度不高于约300℃ C.用去离子水洗涤，除去洗涤水，干燥并分级以获得-325目粒度。 荧光体表现出至少与通过不含水作为研磨液的方法产生的荧光体相当的亮度。

    Method of making YTaO.sub.4 :Nb phosphor with improved brightness using lithium chloride-lithium sulfate eutectic flux
    7.
    发明授权
    Method of making YTaO.sub.4 :Nb phosphor with improved brightness using lithium chloride-lithium sulfate eutectic flux 失效
    制备YTaO4的方法：使用氯化锂 - 硫酸锂共晶助熔剂改善亮度的Nb荧光粉

    公开(公告)号：US4938890A

    公开(公告)日：1990-07-03

    申请号：US481550

    申请日：1990-02-20

    申请人： Vaddi B. Reddy

    发明人： Vaddi B. Reddy

    IPC分类号： C09K11/77 ,  C09K11/78

    CPC分类号： C09K11/7701

    摘要： A method of making a niobium activated yttrium tantalate x-ray phosphor using a lithium chloride-lithium sulfate eutectic flux is disclosed. The mole ratio of the flux is 46.5 mole percent lithium chloride to 53.5 mole percent lithium sulfate. Use of this flux improves phosphor brightness by up to 18%, reducing the x-ray dosage to the patient.

    摘要翻译： 公开了一种使用氯化锂 - 硫酸锂共晶助熔剂制造铌激活的钽酸钇x射线荧光体的方法。 助熔剂的摩尔比为46.5摩尔％氯化锂至53.5摩尔％的硫酸锂。 使用该助焊剂可将荧光亮度提高高达18％，从而降低对患者的X射线剂量。

    Process for improving the luminescence and bulk density of niobium activated yttrium tantalate X-ray phosphor
    8.
    发明授权
    Process for improving the luminescence and bulk density of niobium activated yttrium tantalate X-ray phosphor 失效
    用于提高铌激活的钽酸钇X射线荧光粉的发光和体积密度的方法

    公开(公告)号：US4925702A

    公开(公告)日：1990-05-15

    申请号：US416199

    申请日：1989-10-02

    申请人： Vaddi B. Reddy

    发明人： Vaddi B. Reddy

    IPC分类号： C09K11/77 ,  C09K11/78

    CPC分类号： C09K11/7701

    摘要： A process is disclosed for producing M' phase YTaO.sub.4 :Nb X-ray phosphor which comprises forming a mixture of components Y.sub.2 O.sub.3, Ta.sub.2 O.sub.5, and Nb.sub.2 O.sub.5, and a flux which can be lithium chloride, lithium sulfate or a mix of lithium sulfate and potassium sulfate in an 80 to 20 mole ratio, the flux making up about 25% to 50% by weight of the mixture, the components being provided in stoichiometric amounts to form the phosphor, firing the mixture in a furnace by heating to a temperature of about 1200.degree. C. to 1300.degree. C. at a heating rate of about 1.0.degree. C./min. to 1.5.degree. C./min. and maintaining the temperature for about 10 to 14 hours to react the components and produce luminescent material, cooling the material by turning off the heat to the furnace and allowing the material to remain therein until the temperature is no higher than about 300.degree. C., washing with deionized water, removing the wash water and drying, and classifying to obtain a -325 mesh particle size, forming a uniform blend of the phosphor and silicon dioxide wherein the amount of silicon dioxide is about 0.01% to 0.1% by weight, and wherein the silicon dioxide has a particle size of less than about 1 micrometer in diameter, and dry milling to produce a silicon dioxide coated phosphor having a bulk density of at least about 50% greater than the phosphor produced absent the coating and a luminescence improvement of at least about 4% over the phosphor produced absent the coating.

    摘要翻译： 公开了用于制造M'相YTaO4：Nb X射线荧光体的方法，其包括形成组分Y 2 O 3，Ta 2 O 5和Nb 2 O 5的混合物，以及可以是氯化锂，硫酸锂或硫酸锂和硫酸钾的混合物 在80至20摩尔比中，助熔剂占混合物重量的约25％至50％，组分以化学计量的量提供以形成荧光体，通过加热至约1200℃的温度在炉中焙烧该混合物 ℃至1300℃，加热速率约为1.0℃/分钟。 至1.5℃/分钟。 并保持温度约10至14小时以使组分反应并产生发光材料，通过将热量转移到炉中并使材料保持在其中直到温度不高于约300℃来冷却材料， 用去离子水洗涤，除去洗涤水并干燥，并分级得到-325目粒度，形成磷光体和二氧化硅的均匀共混物，其中二氧化硅的量为约0.01重量％至0.1重量％，以及 其中所述二氧化硅具有直径小于约1微米的粒径，并且干法研磨以产生二氧化硅涂覆的荧光体，其堆积密度比不存在所述涂层产生的荧光体大至少约50％，并且发光改善 比没有涂层产生的磷光体至少约4％。

    Process for YTaO.sub.4 :Nb phosphor preparation using reduced amount of flux
    9.
    发明授权
    Process for YTaO.sub.4 :Nb phosphor preparation using reduced amount of flux 失效
    YTaO4的工艺：使用减少量的助焊剂的铌磷光体制备

    公开(公告)号：US4935161A

    公开(公告)日：1990-06-19

    申请号：US417413

    申请日：1989-10-05

    申请人： Vaddi B. Reddy ,  Ha Cheung

    发明人： Vaddi B. Reddy ,  Ha Cheung

    IPC分类号： C09K11/77 ,  C09K11/78

    CPC分类号： C09K11/7767

    摘要： A process is disclosed for preparing M' YTaO.sub.4 :Nb x-ray phosphor which comprises forming a uniform first mixture of Y.sub.2 O.sub.3, Ta.sub.2 O.sub.5, and Nb.sub.2 O.sub.5 in amounts equal to approximately the stoichiometric amounts to form the phosphor, milling with a flux of lithium chloride, the flux making up about 25% to 33% by weight of the mixture, firing the mixture in a furnace by heating to a temperature of about 1200.degree. C. to 1300.degree. C. at a heating rate of about 1.0.degree. C./minute to 1.5.degree. C./minute and maintaining the temperature for about 10 to 14 hours to react the components and produce a fired material containing luminescent material, cooling the material by turning off the heat and allowing the material to remain in the furnace until the temperature is no higher than about 300.degree. C., washing with deionized water, removing the wash water, drying, and classifying to obtain a -325 mesh particle size. The phosphor exhibits improved brightness over that of phosphors produced by methods using water or organic solvents as the milling fluid and substantially reduces crucible corrosion. Reduced amount of Nb.sub.2 O.sub.5 activator concentration has a beneficial effect on phosphor brightness.

    摘要翻译： 公开了一种用于制备M'YTaO 4：Nb x射线荧光体的方法，其包括以等于化学计量的量等于大约化学计量的量形成均匀的Y 2 O 3，Ta 2 O 5和Nb 2 O 5的第一混合物以形成荧光体，用氯化锂助熔剂研磨， 助熔剂占混合物的约25〜33重量％，通过以约1.0℃/分钟的加热速率加热至约1200℃至1300℃的温度在炉中烧制混合物 至1.5℃/分钟并保持温度约10至14小时以使组分反应，并产生含有发光材料的烧制材料，通过关闭热量冷却材料并使材料保留在炉中直到温度 不高于约300℃，用去离子水洗涤，除去洗涤水，干燥并分级得到-325目粒度。 与通过使用水或有机溶剂作为研磨流体的方法产生的荧光体相比，荧光体的亮度提高，并且基本上减少了坩埚腐蚀。 Nb2O5活化剂浓度的降低对荧光体亮度有很好的影响。

    Process for improving the luminescence of niobium activated yttrium tantalate X-ray phosphor
    10.
    发明授权
    Process for improving the luminescence of niobium activated yttrium tantalate X-ray phosphor 失效
    改善铌活化钇钇X射线荧光粉发光的工艺

    公开(公告)号：US4929384A

    公开(公告)日：1990-05-29

    申请号：US362717

    申请日：1989-06-07

    申请人： Vaddi B. Reddy

    发明人： Vaddi B. Reddy

    IPC分类号： C09K11/77 ,  C09K11/78

    CPC分类号： C09K11/7701

    摘要： A process is disclosed for producing M' phase YTaO.sub.4 :Nb X-ray phosphor which comprises forming a mixture of the components Y.sub.2 O.sub.3, Ta.sub.2 O.sub.5, and Nb.sub.2 O.sub.5, and a flux which can be lithium chloride, lithium sulfate or a mix of lithium sulfate and potassium sulfate in a mole ratio of 80 to 20, the flux making up about 25% to 50% by weight of the mixture, the components being provided in an amount equal to approximately the stoichiometric amounts to form the phosphor, firing the mixture in a furnace by heating to a temperature of about 1200.degree. C. to 1300.degree. C. at a heating rate of about 1.0.degree. C./min. to 1.5.degree. C./min. and maintaining the temperature for about 10 to 14 hours to react the components and produce a fired material containing luminescent material, cooling the material by turning off the heat to the furnace and allowing the material to remain in the furnace until the temperature is no higher than about 300.degree. C., washing with deionized water, removing the wash water and drying, and classifying to obtain a -325 mesh particle size in the phosphor, forming a mixture of the phosphor and flux wherein the flux makes up about 10 to 50% by weight of the mixture, firing as before with the temperature being about 1100.degree. C. to 1300.degree. C. and the time being about 2 to 10 hours, cooling, washing, drying and classifying to produce a phosphor having a higher luminescence intensity than phosphors produced absent the second firing step.

    摘要翻译： 公开了用于制造M'相YTaO4：Nb X射线荧光体的方法，其包括形成Y 2 O 3，Ta 2 O 5和Nb 2 O 5组分的混合物，以及可以是氯化锂，硫酸锂或硫酸锂和钾的混合物 硫酸盐的摩尔比为80至20，助熔剂占混合物重量的约25％至50％，所述组分以等于化学计量量的量提供以形成荧光体，将混合物在炉中焙烧 通过以约1.0℃/分钟的加热速率加热至约1200℃至1300℃的温度。 至1.5℃/分钟。 并保持温度约10至14小时以使组分反应并产生含有发光材料的烧制材料，通过将热量切断到炉中并使材料保持在炉中直至温度不高于 约300℃，用去离子水洗涤，除去洗涤水并干燥，并在磷光体中分级获得-325目粒度，形成荧光粉和助熔剂的混合物，其中助熔剂组成约10至50％ 的混合物中，烧制温度为约1100℃至1300℃，时间为约2至10小时，冷却，洗涤，干燥和分级以产生具有较高发光强度的荧光体 在第二烧制步骤中不产生荧光体。