公开(公告)号：US5503771A

公开(公告)日：1996-04-02

申请号：US189278

申请日：1994-01-27

申请人： James T. Staley ,  Ilhan A. Aksay ,  Gordon L. Graff ,  Nancy B. Pellerin ,  Tao Ren

发明人： James T. Staley ,  Ilhan A. Aksay ,  Gordon L. Graff ,  Nancy B. Pellerin ,  Tao Ren

IPC分类号： B01J13/00 ,  B22F1/00 ,  C04B35/636 ,  C03C1/02

CPC分类号： B22F1/0022 ,  B01J13/0034 ,  B01J13/0056 ,  B22F1/0059 ,  B82Y30/00 ,  C04B35/636 ,  B22F2998/00

摘要： A method for producing a highly loaded, aqueous suspension having a pourable viscosity and containing from 20 to 50 volume percent colloidal ceramic or metal particles. A biologically produced polymer dispersant having a high density of carboxyl functional groups and an average molecular weight of at least 1,000 is solubilized in water in a quantity of less than 1.0 percent dry weight basis of particles. The ceramic or metal particles are then introduced to the solution, and agitated to form a substantially nonagglomerated suspension. The polymer dispersant may be produced by a bacterium grown in situ with the particles. A biologically produced polymer gelling agent that is miscible with the polymer dispersant may be admixed into the suspension, which is then maintained in a nongelled state while being supplied to a mold. The suspension is then exposed to a gel-triggering condition to form a gelled, sinterable article.

摘要翻译： 一种制备具有可倾倒粘度并含有20至50体积％的胶体陶瓷或金属颗粒的高负荷水性悬浮液的方法。 具有高密度羧基官能团并且平均分子量至少为1,000的生物学生产的聚合物分散剂以小于1.0％干重的颗粒的量溶解在水中。 然后将陶瓷或金属颗粒引入溶液中，并搅拌形成基本上非凝聚的悬浮液。 聚合物分散剂可以通过用颗粒原位生长的细菌产生。 可以与聚合物分散剂混溶的生物学生产的聚合物胶凝剂可以混合到悬浮液中，然后在悬浮液中保持在非通气状态，同时被供给到模具中。 然后将悬浮液暴露于凝胶触发条件以形成胶凝的可烧结制品。

公开(公告)号：US4605440A

公开(公告)日：1986-08-12

申请号：US730528

申请日：1985-05-06

申请人： Danny C. Halverson ,  Aleksander J. Pyzik ,  Ilhan A. Aksay

发明人： Danny C. Halverson ,  Aleksander J. Pyzik ,  Ilhan A. Aksay

IPC分类号： C04B35/58 ,  C04B35/56 ,  C04B35/563 ,  C04B35/65 ,  C22C1/05 ,  C22C29/00 ,  C22C29/02 ,  C22C29/06 ,  C22C29/14 ,  C22C29/04

CPC分类号： C04B35/563 ,  C04B35/65 ,  C22C1/058 ,  C22C29/00 ,  C22C29/14

摘要： Hard, tough, lightweight boron-carbide-reactive metal composites, particularly boron-carbide-aluminum composites, are produced. These composites have compositions with a plurality of phases. A method is provided, including the steps of wetting and reacting the starting materials, by which the microstructures in the resulting composites can be controllably selected. Starting compositions, reaction temperatures, reaction times, and reaction atmospheres are parameters for controlling the process and resulting compositions. The ceramic phases are homogeneously distributed in the metal phases and adhesive forces at ceramic-metal interfaces are maximized. An initial consolidation step is used to achieve fully dense composites. Microstructures of boron-carbide-aluminum cermets have been produced with modulus of rupture exceeding 110 ksi and fracture toughness exceeding 12 ksi.sqroot.in. These composites and methods can be used to form a variety of structural elements.

摘要翻译： 硬质，坚韧，轻质的碳化硼反应性金属复合材料，特别是碳化硼 - 铝复合材料。 这些复合材料具有多个阶段的组合物。 提供了一种方法，包括使原料润湿和反应的步骤，由此可以可控地选择所得复合材料中的微结构。 起始组成，反应温度，反应时间和反应气氛是控制工艺和所得组合物的参数。 陶瓷相均匀分布在金属相中，陶瓷 - 金属界面的粘合力最大化。 使用初始固结步骤来实现完全致密的复合材料。 已经生产了碳化硼 - 铝金属陶瓷的微结构，断裂模量超过110ksi，断裂韧性超过12ksi 2ROOT。这些复合材料和方法可用于形成各种结构元素。