公开(公告)号：WO1989004735A1

公开(公告)日：1989-06-01

申请号：PCT/US1988004691

申请日：1988-11-23

Applicant: CERAMICS PROCESS SYSTEMS CORPORATION

Inventor： CERAMICS PROCESS SYSTEMS CORPORATION ,  WEI, Wen-Cheng ,  NOVICH, Bruce, E.

IPC: B22F03/16

CPC classification number: B22F3/225 ,  B22F3/222 ,  B22F2998/00 ,  C04B35/632 ,  C04B35/80 ,  C22C47/14

Abstract: Dense, flaw-free, complex shaped, three-dimensional, reinforced inorganic articles are formed by a process including the steps of providing a low viscosity suspension of solids, generally either ceramic or metallic, present at least at about 35 vol.%, reinforcement material having a high aspect ratio (e.g., fibers, whiskers, platelets), and dispersant, and shaping the suspension under low shear forces to produce a green article that can be pressureless sintered to net shape with minimal distortion. Shaping can be accomplished by casting or low pressure injection molding (less than about 100 psi) or by a freeze-forming and freeze-drying process. The low viscosity of the molding slurry and forming under low shear stress avoids reinforcement particle alignment. Accordingly, sintered articles exhibit a high tolerance to the originally molded shape and very little distortion during densification.

Abstract translation: 通过包括以下步骤的方法形成密集，无瑕疵，复杂形状的三维增强无机制品，所述方法包括提供至少存在至少约35体积％的增强剂的通常为陶瓷或金属的固体的低粘度悬浮液 具有高纵横比的材料（例如，纤维，晶须，血小板）和分散剂，以及在低剪切力下成型悬浮液以产生可以以最小变形无压力地烧结成网状的绿色制品。 成型可以通过铸造或低压注射成型（小于约100psi）或通过冷冻干燥和冷冻干燥来实现。 成型浆料的低粘度和低剪切应力下的成形避免了增强粒子的对齐。 因此，烧结制品表现出对原始模制形状的高耐受性和致密化期间的非常小的变形。

公开(公告)号：WO1988007400A1

公开(公告)日：1988-10-06

申请号：PCT/US1988001008

申请日：1988-03-23

Applicant: CERAMICS PROCESS SYSTEMS CORPORATION

Inventor： CERAMICS PROCESS SYSTEMS CORPORATION ,  NOVICH, Bruce, E. ,  POBER, Richard, L.

IPC: B01D21/26

CPC classification number: C02F1/52 ,  B03B5/00 ,  B03B9/00 ,  C02F1/385

Abstract: Colloidal particles can be separated from suspension (13) using a centrifuge which includes a static fluid volume (44) formed prior to introduction of the feed slurry (13). A more precise and accurate classification fraction is obtained thereby. A classification system, including a number of such centrifuges (233, 236, 237, 238) cascaded together, provides the ability to obtain numerous submicron classification fractions where the feed is a well-dispersed slurry of colloidal particles and the flow rate and rotation speed in and through each of the centrifuge units is controlled in real time. Such submicron classification fractions often exhibit dilatant rheology and, therefore, are very difficult to remove from the centrifuge bowl. The present invention provides a method for facilitating the removal of such dilatant cakes by the use of an excess amount of dispersant which is effective to disperse the colloids and to provide a plastic, rather than a dilatant, cake, while also having little effect on the dispersion rheology.

Abstract translation: 可以使用包括在引入进料浆料（13）之前形成的静态流体体积（44）的离心机将胶体颗粒与悬浮液（13）分离。 从而获得更准确和准确的分级分数。 分级系统，包括多个级联在一起的离心机（233,236,237,238），提供了获得许多亚微米分级分数的能力，其中进料是胶体颗粒的分散良好的浆料，流速和转速 通过每个离心机单元进行实时控制。 这种亚微米分级级分通常表现出膨胀的流变性，因此非常难以从离心机碗中去除。 本发明提供了一种通过使用过量的分散剂来促进这种膨胀蛋糕的去除的方法，该分散剂有效地分散胶体并提供塑料而不是膨胀的蛋糕，同时对 分散流变学。