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    Gelcasting methods
    1.
    发明授权
    Gelcasting methods 失效
    凝胶浇注方法

    公开(公告)号：US6066279A

    公开(公告)日：2000-05-23

    申请号：US135500

    申请日：1998-08-17

    申请人： Claudia A. Walls ,  Glen H. Kirby ,  Mark A. Janney ,  Ogbemi O. Omatete ,  Stephen D. Nunn ,  April D. McMillan

    发明人： Claudia A. Walls ,  Glen H. Kirby ,  Mark A. Janney ,  Ogbemi O. Omatete ,  Stephen D. Nunn ,  April D. McMillan

    IPC分类号： C04B35/111 ,  C04B35/447 ,  C04B35/486 ,  C04B35/634

    CPC分类号： C04B35/486 ,  C04B35/111 ,  C04B35/447 ,  C04B35/63444 ,  B22F2001/0066

    摘要： A method of gelcasting includes the steps of providing a solution of at least hydroxymethylacrylamide (HMAM) and water. At least one inorganic powder is added to the mixture. At least one initiator system is provided to polymerize the HMAM. The initiator polymerizes the HMAM and water, to form a firm hydrogel that contains the inorganic powder. One or more comonomers can be polymerized with the HMAM monomer, to alter the final properties of the gelcast material. Additionally, one or more additives can be included in the polymerization mixture, to alter the properties of the gelcast material.

    摘要翻译： 凝胶注射的方法包括提供至少羟甲基丙烯酰胺（HMAM）和水的溶液的步骤。 向混合物中加入至少一种无机粉末。 提供至少一个引发剂体系来聚合HMAM。 引发剂聚合HMAM和水，形成含有无机粉末的坚固的水凝胶。 一种或多种共聚单体可以与HMAM单体聚合，以改变凝胶塑料的最终性能。 此外，聚合混合物中可以包括一种或多种添加剂，以改变凝胶状材料的性质。

    Method of making a functionally graded material
    4.
    发明授权
    Method of making a functionally graded material 失效
    制作功能分级材料的方法

    公开(公告)号：US06248286B1

    公开(公告)日：2001-06-19

    申请号：US09453774

    申请日：1999-12-03

    申请人： Robert J. Lauf ,  Paul A. Menchhofer ,  Claudia A. Walls

    发明人： Robert J. Lauf ,  Paul A. Menchhofer ,  Claudia A. Walls

    IPC分类号： B28B114

    CPC分类号： B28B1/008 ,  B22F7/06 ,  B22F2999/00 ,  B28B1/00 ,  C04B35/117 ,  B22F2207/01 ,  B22F3/22

    摘要： 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.

    摘要翻译： 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。

    Method of making a functionally graded material
    6.
    发明授权
    Method of making a functionally graded material 失效
    制作功能分级材料的方法

    公开(公告)号：US06375877B2

    公开(公告)日：2002-04-23

    申请号：US09842375

    申请日：2001-04-24

    申请人： Robert J. Lauf ,  Paul A. Menchhofer ,  Claudia A. Walls ,  Arthur J. Moorhead

    发明人： Robert J. Lauf ,  Paul A. Menchhofer ,  Claudia A. Walls ,  Arthur J. Moorhead

    IPC分类号： B29C6500

    CPC分类号： B28B1/008 ,  B22F7/06 ,  B22F2999/00 ,  B28B1/00 ,  C04B35/117 ,  B22F2207/01 ,  B22F3/22

    摘要： 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.

    摘要翻译： 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。