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    • 3. 发明授权
    • Method for preparing spherical ferrite beads and use thereof
    • 制备球形铁氧体磁珠的方法及其用途
    • US06492016B1
    • 2002-12-10
    • US09917356
    • 2001-07-27
    • Robert J. LaufKimberly K. AndersonFrederick C. MontgomeryJack L. Collins
    • Robert J. LaufKimberly K. AndersonFrederick C. MontgomeryJack L. Collins
    • C01G4906
    • H01F1/11C01G49/0036C01P2002/76C01P2004/20C01P2004/61C01P2004/62Y10T428/256Y10T428/257Y10T428/258Y10T428/2982
    • The invention allows the fabrication of small, dense, highly polished spherical beads of hexagonal ferrites with selected compositions for use in nonreciprocal microwave and mm-wave devices as well as in microwave absorbent or reflective coatings, composites, and the like. A porous, generally spherical bead of hydrous iron oxide is made by a sol-gel process to form a substantially rigid bead having a generally fine crystallite size and correspondingly finely distributed internal porosity. The resulting gel bead is washed and hydrothermally reacted with a soluble alkaline earth salt (typically Ba or Sr) under conditions of elevated temperature and pressure to convert the bead into a mixed hydrous iron-alkaline earth oxide while retaining the generally spherical shape. This mixed oxide bead is then washed, dried, and calcined to produce the desired (BaFe12O19 or SrFe12O19) crystal structure. The calcined bead is then sintered to form a dense bead of the BaFe12O19 and SrFe12O19 phase suitable for polishing and incorporation into various microwave devices and components.
    • 本发明允许制造用于非互易微波和毫米波装置以及微波吸收或反射涂层,复合材料等的选定组合物的小而致密,高度抛光的六方晶系铁氧体球形珠。 通过溶胶 - 凝胶法制备多孔的,通常为球形的含水氧化铁珠,以形成具有通常微细尺寸和相应地精细分布的内部孔隙率的基本刚性的珠粒。 在升高的温度和压力的条件下,将所得凝胶珠洗涤并与可溶性碱土金属盐(通常为Ba或Sr)水热反应,以将珠粒转化为混合的含水铁 - 碱土金属氧化物,同时保持大致球形。 然后将该混合氧化物珠粒洗涤,干燥并煅烧以产生所需的(BaFe12O19或SrFe12O19)晶体结构。 然后将煅烧的珠粒烧结以形成适合抛光并掺入各种微波装置和组件的BaFe12O19和SrFe12O19相的致密珠粒。
    • 5. 发明授权
    • Method for preparing hydrous iron oxide gels and spherules
    • 水合氧化铁凝胶和球晶的制备方法
    • US06599493B2
    • 2003-07-29
    • US09917117
    • 2001-07-27
    • Jack L. CollinsRobert J. LaufKimberly K. Anderson
    • Jack L. CollinsRobert J. LaufKimberly K. Anderson
    • C01G4900
    • C01G49/02C01G49/0036C01P2004/32C01P2004/62
    • The present invention is directed to methods for preparing hydrous iron oxide spherules, hydrous iron oxide gels such as gel slabs, films, capillary and electrophoresis gels, iron monohydrogen phosphate spherules, hydrous iron oxide spherules having suspendable particles homogeneously embedded within to form composite sorbents and catalysts, iron monohydrogen phosphate spherules having suspendable particles of at least one different sorbent homogeneously embedded within to form a composite sorbent, iron oxide spherules having suspendable particles homogeneously embedded within to form a composite of hydrous iron oxide fiber materials, iron oxide fiber materials, hydrous iron oxide fiber materials having suspendable particles homogeneously embedded within to form a composite, iron oxide fiber materials having suspendable particles homogeneously embedded within to form a composite, dielectric spherules of barium, strontium, and lead ferrites and mixtures thereof, and composite catalytic spherules of barium or strontium ferrite embedded with oxides of Mg, Zn, Pb, Ce and mixtures thereof. These variations of hydrous iron oxide spherules and gel forms prepared by the gel-sphere, internal gelation process offer more useful forms of inorganic ion exchangers, catalysts, getters, dielectrics, and ceramics.
    • 本发明涉及制备含水氧化铁球,含水氧化铁凝胶如凝胶板,薄膜,毛细管和电泳凝胶,单磷酸铁球,含有均匀嵌入其中的悬浮颗粒的含水氧化铁球,形成复合吸附剂的方法, 催化剂,具有均匀嵌入以形成复合吸附剂的至少一种不同吸附剂的悬浮颗粒的磷酸一氢化铁小球,具有均匀嵌入其中的可悬浮颗粒的氧化铁球,形成水合氧化铁纤维材料,氧化铁纤维材料,含水 具有均匀地嵌入其中以形成复合材料的悬浮颗粒的氧化铁纤维材料,具有均匀地嵌入其中的可悬浮颗粒的氧化铁纤维材料,以形成钡,锶和铅铁氧体的介电球,及其混合物,以及复合催化剂 包含Mg,Zn,Pb,Ce的氧化物的钡或锶铁氧体的球体及其混合物。 通过凝胶球,内部凝胶化方法制备的含水氧化铁球和凝胶形式的这些变化提供了更有用的无机离子交换剂,催化剂,吸气剂,电介质和陶瓷的形式。
    • 6. 发明授权
    • Method of making a functionally graded material
    • 制作功能分级材料的方法
    • US06248286B1
    • 2001-06-19
    • US09453774
    • 1999-12-03
    • Robert J. LaufPaul A. MenchhoferClaudia A. Walls
    • Robert J. LaufPaul A. MenchhoferClaudia A. Walls
    • B28B114
    • B28B1/008B22F7/06B22F2999/00B28B1/00C04B35/117B22F2207/01B22F3/22
    • A gelcasting method of making an internally graded article includes the steps of: preparing at least two slurries, each of the slurries including a different gelcastable powder suspended in a gelcasting solution, the slurries characterized by having comparable shrinkage upon drying and sintering thereof; casting the slurries into a mold having a selected shape, wherein relative proportions of the slurries is varied in at least one direction within the selected shape; gelling the slurries to form a solid gel while preserving the variation in relative proportions of the slurries; drying the gel to form a dried green body; and sintering the dry green body to form a solid object, at least one property thereof varying because of the variation in relative proportions of the starting slurries. A gelcasting method of making an internally graded article alternatively includes the steps of: preparing a slurry including a least two different phases suspended in a gelcasting solution, the phases characterized by having different settling characteristics; casting the slurry into a mold having a selected shape; allowing the slurry to stand for a sufficient period of time to permit desired gravitational fractionation in order to achieve a vertical compositional gradient in the molded slurry; gelling the slurry to form a solid gel while preserving the vertical compositional gradient in the molded slurry; drying the gel to form a dried green body; and sintering the dry green body to form a solid object, at least one property thereof varying along the vertical direction because of the compositional gradient in the molded slurry.
    • 制备内部分级制品的凝胶浇铸方法包括以下步骤:制备至少两种浆料,每种浆料包括悬浮在凝胶浇注溶液中的不同的可凝胶涂覆粉末,其特征在于其干燥和烧结时具有相当的收缩率; 将浆料浇铸到具有选定形状的模具中,其中浆料的相对比例在所选形状内的至少一个方向上变化; 胶凝形成固体凝胶,同时保持浆料相对比例的变化; 干燥凝胶以形成干燥的生坯; 并且将干燥的生坯烧结以形成固体物体,由于起始浆料的相对比例的变化,其至少一种性质变化。 制备内部分级制品的凝胶浇铸方法交替包括以下步骤:制备包含悬浮在凝胶浇注溶液中的至少两个不同相的浆料,其特征在于具有不同的沉降特性; 将浆料浇注到具有选定形状的模具中; 允许浆料静置足够的时间以允许所需的重力分馏,以便在模制浆料中达到垂直组分梯度; 将浆料胶凝以形成固体凝胶,同时保持模制浆料中的垂直组分梯度; 干燥凝胶以形成干燥的生坯; 并且将干燥的生坯烧结以形成固体物体,由于模制浆料中的组成梯度,其至少一种特性沿垂直方向变化。