Agency for Defense Development

The United States of America As Represented by the United States

Lockheed Martin Energy Research Corporation

Ut-battelle, Inc.

Seoul National University

Snu Rdb Foundation

Hyoun-Ee Kim

Arthur J Moorhead

Yong Kee Baek

Eul Son Kang

June Ho Park

Ki Min Lee

Won Ho Lee

Eun-Jung Lee

Seung Su Baek

Shin-Hee Jun

Young Hak Ko

Hea-Won Kim

Eul-Son Kang

A method for manufacturing a porous ceramic scaffold having an organic/inorganic hybrid coating layer containing a bioactive factor includes (a) forming a porous ceramic scaffold; (b) mixing a silica xerogel and a physiologically active organic substance in a volumetric ratio ranging from 30:70 to 90:10 and treating by a sol gel method to prepare an organic/inorganic hybrid composite solution; (c) adding a bioactive factor to the organic/inorganic hybrid composite solution and agitating until gelation occurs; and (d) coating the porous ceramic scaffold with the organic/inorganic composite containing the bioactive factor added thereto. In accordance with the method, the porous ceramic scaffold may be uniformly coated with the organic/inorganic hybrid composite while maintaining an open pore structure, and stably discharge the bioactive factor over a long period of time.

Method for manufacturing a porous ceramic scaffold having an organic/inorganic hybrid coating layer containing a bioactive factor

The present invention provides a porous bioceramics for bone scaffold. The porous bioceramics according to the present invention comprises a biocompatible porous ceramic substrate having the property to thermal-decompose hydroxyapatite in contact with it; a fluorapatite (FA) inner layer formed on said porous ceramic substrate; and a hydroxyapatite (HA) outer layer formed on said fluorapatite inner layer. The insertion of FA intermediate layer can prevent the thermal reaction between ZrOand HA. Therefore, the present invention can provide the implant material into human body having excellent mechanical properties of zirconia as well as the biocompatibility, bioaffinity and bioactivity of HA. The present invention can also provide the implant material to promote osteoconduction and osteointegration in human body.

Porous bioceramics for bone scaffold and method for manufacturing the same

The present invention relates to a titanium diboride sintered body and a method for manufacturing thereof wherein silicon nitride is added to a titanium diboride as a sintering aid. The sintered body according to the present invention has a fine structure and excellent physical characteristics such as a strength, hardness, etc. Therefore, the sintered body according to the present invention may be applicable to certain materials which requires high strength and hardness.

Titanium diboride sintered body with silicon nitride as a sintering aid

Titanium diboride sintered body with silicon nitride as a sintering aid and a method for manufacture thereof

A silicon nitride sintered body is obtained by mixing 2.about.16 wt % of Yb.sub.2 O.sub.3 as a sintering additive with Si.sub.3 N.sub.4 powders including unavoidable impuirities, pressing the mixed powder into a desired form, and gas-pressure sintering the thusly pressed form, whereby an inner region of the sintered body has a fine microstructure, and an outer region thereof has a mixed microstructure in which elongated grains and fine grains co-exist and a method for manufacturing a silicon nitride sintered body, includes the steps of: adding and mixing 2.about.16 wt % of Yb.sub.2 O.sub.3 powder as a sintering additive into a silicon nitride (Si.sub.3 N.sub.4) powder; ball-milling the mixed powder to obtain a slurry; drying and classifying the slurry; press-forming the resultant powder in a die uniaxially and isostatically; and gas-pressure sintering the resultant compact body at a temperature in the range of 1800.about.2000.degree. C., whereby an inner region of the resultant sintered body has a fine microstructure, and an outer region of the resultant sintered body has a mixed microstructure in which elongated grains and fine grains co-exist.

Silicon nitride sintered body with region varying microstructure and

A composite structure and method for manufacturing same, the composite structure being comprised of metal particles and an inorganic bonding media. The method comprises the steps of coating particles of a metal powder with a thin layer of an inorganic bonding media selected from the group of powders consisting of a ceramic, glass, and glass-ceramic. The particles are assembled in a cavity and heat, with or without the addition of pressure, is thereafter applied to the particles until the layer of inorganic bonding media forms a strong bond with the particles and with the layer of inorganic bonding media on adjacent particles. The resulting composite structure is strong and remains cohesive at high temperatures.

Composite of coated magnetic alloy particle

A process for strengthening aluminum based ceramics is provided. A gaseous atmosphere consisting essentially of silicon monoxide gas is formed by exposing a source of silicon to an atmosphere consisting essentially of hydrogen and a sufficient amount of water vapor. The aluminum based ceramic is exposed to the gaseous silicon monoxide atmosphere for a period of time and at a temperature sufficient to produce a continuous, stable silicon-containing film on the surface of the aluminum based ceramic that increases the strength of the ceramic.

Process for strengthening aluminum based ceramics and material

Composite of ceramic-coated magnetic alloy particles

A method for strengthening and aging-prevention of a TZP ceramics includes the steps of: introducing TZP ceramic and Si-based ceramic powders into a furnace in which a water vapor pressure is controlled; and exposing the TZP ceramic next to Si-based ceramic in a flowing H.sub.2 atmosphere containing H.sub.2 O of no more than 0.1%, to form a silica/zircon layer on the surface of the TZP ceramic.

Method for strengthening and aging-prevention of TZP by formation of

A laminated composite structure of alternating metal powder layers, and layers formed of an inorganic bonding media powder, and a method for manufacturing same are discosed. The method includes the steps of assembling in a cavity alternating layers of a metal powder and an inorganic bonding media of a ceramic, glass, and glass-ceramic. Heat, with or without pressure, is applied to the alternating layers until the particles of the metal powder are sintered together and bonded into the laminated composite structure by the layers of sintered inorganic bonding media to form a strong composite structure. The method finds particular application in the manufacture of high performance magnets wherein the metal powder is a magnetic alloy powder.

Laminated composite of magnetic alloy powder and ceramic powder and

A transparent, strong CsI alloy havign additions of monovalent iodides. Although the perferred iodide is AgI, RbI and CuI additions also contribute to an improved polycrystalline CsI alloy.

Growing community of inventors

Seoul, South Korea

Hyoun-Ee Kim