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    • 62. 发明申请
    • LOW EXPANSION, HIGH POROSITY, HIGH STRENGTH CORDIERITE BODY AND METHOD
    • 低膨胀度,高孔隙度,高强度正交体和方法
    • WO0076939A9
    • 2002-06-20
    • PCT/US0015792
    • 2000-06-08
    • CORNING INC
    • BEALL DOUGLAS MMALARKEY CHRISTOPHER JMERKEL GREGORY A
    • F01N3/28B01D53/86B01J35/04B01J35/10C04B35/195C04B38/00
    • C04B38/0006C04B35/195C04B2111/00129C04B2111/0037C04B2111/0081C04B2111/32Y10T428/24149Y10T428/24273C04B38/0051C04B38/0054C04B38/007
    • A sintered ceramic that exhibits an average linear coefficient of thermal expansion (25-800 DEG C) below about 5.0x10 DEG C , a total porosity between the range of 20% to about 30%. Furthermore, the sintered ceramic article exhibits a pore size distribution such that at least about 86% of pores are of a pore size of less than about 2 mu m. Lastly, the ceramic article exhibits an interconnected pore structure with the pores exhibiting a generally elongated shape, i.e., the pores are predominately oriented with their long axis in the plane of the webs. This invention also relates to a method for producing a sintered cordierite ceramic article involving first compounding and plasticizing a cordierite-forming inorganic powder batch comprising a platy talc having median particle of size less than about 2 mu m, and preferably a talc morphology index greater than about 0.75. The batch further comprises at least 4% by weight of the inorganic powder batch mixture of a dispersible A12O3-forming source having a specific surface area in excess of 50m /g and one or more of the components of kaolin, calcined kaolin, silica, and corundum, each having a median particle sizes less than 5 mu m. The plasticized powder batch thus provided is next formed into a green honeycomb by extrusion through a honeycomb extrusion die and the green honeycomb is fired to a temperature and for a time sufficient to convert the green honeycomb into a crystallized cordierite ceramic article having the aforementioned properties.
    • 表现出低于约5.0×10 -7℃的平均线性热膨胀系数(25-800℃)的烧结陶瓷,总孔隙率在20%至30%之间。 此外,烧结陶瓷制品表现出孔径分布,使得孔的至少约86%的孔径小于约2μm。 最后,陶瓷制品表现出相互连通的孔结构,其中孔呈现出大致细长的形状,即孔主要以其长轴在纤维网的平面中取向。 本发明还涉及一种生产堇青石烧结陶瓷制品的方法,该方法首先将形成堇青石的无机粉末批料混合和塑化,其中包含平均粒径小于约2μm的平板状滑石,优选滑石形态指数大于 约0.75。 批料还包含至少4重量%的具有超过50m 2 / g的比表面积的可分散的形成A12O3的源的无机粉末批料混合物和一种或多种高岭土,煅烧高岭土, 二氧化硅和刚玉,各自具有小于5μm的中值粒度。 由此提供的增塑粉末批料通过蜂窝状挤压模挤出而形成绿色蜂窝状体,将生坯状的蜂窝体烧制至足以将生坯成型为具有上述特性的结晶堇青石陶瓷制品的温度和时间。
    • 66. 发明申请
    • FUNCTIONALLY GRADIENT CERAMIC STRUCTURES
    • 功能梯度陶瓷结构
    • WO1998021164A1
    • 1998-05-22
    • PCT/CA1997000844
    • 1997-11-10
    • NATIONAL RESEARCH COUNCIL OF CANADADARCOVICH, Ken
    • NATIONAL RESEARCH COUNCIL OF CANADA
    • C04B38/00
    • B01D69/02B01D39/2075B01D67/0041B01D67/0046B01D71/02B01D71/024B01D71/025B01D2323/08C04B38/007C04B2111/00405C04B2111/00413C04B2111/00793C04B2111/00801C04B35/03C04B38/0051C04B20/0076C04B35/00C04B38/0045C04B38/0054C04B41/4582
    • The invention disclosed is a self-supporting porous ceramic material, which is typically used in ceramic filters as a substrate prior to coating with a thin dense membrane layer of additional ceramic material. Conventional ceramic support structures are not necessarily designed as membrane support substrates. They are typically made with monosized particles and have a uniform cross section. The present support structure is made via a polydisperse slurry method, where a functionally gradient structure is achieved by a colloidal destabilization technique. The key for achieving this structure is to prepare colloidally unstable or metastable suspensions of a controlled and broad particle size distribution, so that segregation based on particle diameter will occur during consolidation. This produces a continuously finer mean particle diameter axial profile from one major surface to the other on the cross section of the consolidated structure. The particle size distribution control is achieved by blending different ceramic powders. In terms of volume fraction, the continuous particle size distribution of the powder used to make the suspension is preferably coarse-rich.
    • 所公开的发明是一种自支撑多孔陶瓷材料,其通常用于陶瓷过滤器作为基材,然后用附加陶瓷材料的薄致密膜层进行涂覆。 传统的陶瓷支撑结构不一定设计为膜支撑基底。 它们通常由单粒子制成并具有均匀的横截面。 本发明的支撑结构通过多分散浆料法制备,其中通过胶体去稳定化技术实现功能梯度结构。 实现这种结构的关键是制备受控和宽的粒度分布的胶体不稳定或亚稳态悬浮液,使得在固结期间将发生基于粒径的偏析。 这在固结结构的横截面上产生从一个主表面到另一个主表面的连续更细的平均粒径轴向轮廓。 通过混合不同的陶瓷粉末来实现粒度分布控制。 在体积分数方面,用于制备悬浮液的粉末的连续粒度分布优选是粗的。