Plastic and nonmetallic article shaping or treating: processes – Formation of solid particulate material directly from molten... – With subsequent uniting of the particles
Patent
1999-05-12
2000-06-27
Jenkins, Daniel J.
Plastic and nonmetallic article shaping or treating: processes
Formation of solid particulate material directly from molten...
With subsequent uniting of the particles
264 12, 264604, 264667, 264681, C04B 3564
Patent
active
06080341&
ABSTRACT:
A process for making an indium-tin-oxide shaped body, comprising: (a) filling an indium-tin-oxide powder into a first flexible mold, the indium-tin-oxide powder having a specific BET surface of at most 3 m.sup.2 /g with a mean primary particle size of 0.03 .mu.m to 1.0 .mu.m and/or having a density of at least 40% of theoretical density after cold pressing at a pressure of 100 MPa and/or the indium-tin-oxide powder being made by reacting at least two reaction partners comprising a molten indium-tin-metal alloy as a first reaction partner and oxygen as a second reaction partner in a plasma arc in a plasma chamber provided with an inlet opening for the reaction partners and an outlet with a gas-supply device to obtain a material, and quenching the material at the outlet opening of the plasma chamber with a gas stream which cools the material at a cooling rate of 10.sup.5 K/s to 10.sup.8 K/s to +50.degree. C. to +400.degree. C.; (b) cold pressing the indium-tin-oxide powder at a minimum pressure of 100 MPa; (c) placing the cold compact released from the first mold in a ceramic powder in a second mold, the ceramic powder having a maximum particle diameter of 250 .mu.m, and a melting point and a sintering temperature higher than +800.degree. C., the melting point of the second mold being higher than 800.degree. C. and the second mold being ductile under the conditions of a hot isostatic pressing; (d) sealing the second mold in a gastight manner; and (e) subjecting the wetted cold compact to hot isostatic pressing at a minimum temperature of +800.degree. C. and a minimum pressure of 20 MPa.
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Gorywoda Marek
Graf Wolfram
Jablonski Wolfgang
Lupton David Francis
Stenger Bernd
Jenkins Daniel J.
W.C. Heraeus GmbH & Co. KG
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