Gel strength enhancing additives for agaroid-based injection...

C - Chemistry – Metallurgy – 04 – B

Patent

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Details

C04B 35/636 (2006.01) B22F 1/00 (2006.01) B22F 3/00 (2006.01) C04B 24/38 (2006.01) C04B 35/111 (2006.01) C04B 35/584 (2006.01) C04B 35/622 (2006.01) C04B 35/63 (2006.01) C22C 1/04 (2006.01)

Patent

CA 2279966

Parts from ceramic and/or metal powder(s) are shaped by a process that comprises the steps of (1) forming a mixture comprising ceramic and/or metal powder(s), a gel-forming material chosen from the class of polysaccharides known as "agaroids", a gel-forming solvent, and a gel strength enhancing agent, and said mixture being formed in a blender that provides a shearing action and being heated to raise the temperature of the mixture to about 70 °C to 100 °C; and (2) molding the mixture at a temperature sufficient to produce a self-supporting structure comprising the powder and gel. The parts exhibit excellent green strength and are rapidly fired without cracking, distortion or shrinkage problems.

La présente invention concerne des pièces produites à partir d'une ou plusieurs poudres céramiques et/ou métalliques, qui sont formées grâce à un procédé qui comporte les étapes suivantes: (1) la formation d'un mélange comportant une ou plusieurs poudres céramiques et/ou métalliques, une matière gélifiante tirée de la famille des polysaccharides connue sous le nom d'"agaroïdes", un solvant gélifiant, et un agent favorisant le pouvoir gélifiant, ledit mélange étant réalisé dans un mélangeur à effet de cisaillement et étant chauffé en vue d'augmenter la température du mélange jusqu'à environ 70-100 DEG C; et (2) le moulage du mélange à une température suffisante pour produire une structure autonome contenant la poudre et le gel. Lesdites pièces présentent une résistance à vert excellente, on peut les cuire rapidement sans problèmes de fissures, de distorsion et de retassure.

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