CERAMIC BEADS WITH SMOOTH SURFACES AND MANUFACTURING METHOD THEREOF

Title:

CERAMIC BEADS WITH SMOOTH SURFACES AND MANUFACTURING METHOD THEREOF

Document Type and Number:

WIPO Patent Application WO/2010/067782

Kind Code:

A1

Abstract:

Provided are a ceramic bead manufacturing method for obtaining ceramic beads with smooth surfaces using a simpler method without using any complicated processes, such as combining a DC plasma and a high-frequency plasma or using a two-stage high-frequency plasma, and the ceramic beads. A preheated starting ceramic material is introduced into a thermal plasma wherein a laminar flow is formed using a high-voltage type direct-current (DC) plasma gun, and is cooled and solidified, and ceramic beads are then collected. It is preferable that a starting material powder that is preheated by being passed through a furnace through which a heat-resistant pipe runs while the starting ceramic material is fed using a carrier gas be introduced into the thermal plasma, and that the plasma treatment be applied under conditions at which the ceramic beads are discharged at a discharge angle of 60° or greater with respect to the thermal plasma. As a result, good ceramic beads with smooth surfaces and without flaws such as cracks or internal voids in the beads can be obtained.

Inventors:

KOHGO MASANORI (JP)
TAKAHASHI KOYATA (JP)

Application Number:

PCT/JP2009/070504

Publication Date:

June 17, 2010

Filing Date:

December 08, 2009

Export Citation:

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Assignee:

TOSOH CORP (JP)
KOHGO MASANORI (JP)
TAKAHASHI KOYATA (JP)

International Classes:

C01G25/02; B01J19/08

Foreign References:

JP2009173461A	2009-08-06
JPH02203932A	1990-08-13
JPH09110517A	1997-04-28
JPS462174B1
JP2007112707A	2007-05-10
JPS63250401A	1988-10-18
JP2001039773A	2001-02-13
JP2707528B2	1998-01-28
JPH06183833A	1994-07-05
JPS63250401A	1988-10-18
JPH06287012A	1994-10-11
JPH0625717A	1994-02-01
JP2002346377A	2002-12-03

Other References: