Invention Grant
- Patent Title: Ceramic beads with smooth surfaces and process for producing the same
- Patent Title (中): 具有光滑表面的陶瓷珠及其制造方法
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Application No.: US13133304Application Date: 2009-12-08
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Publication No.: US08637154B2Publication Date: 2014-01-28
- Inventor: Masanori Kohgo , Koyata Takahashi
- Applicant: Masanori Kohgo , Koyata Takahashi
- Applicant Address: JP Yamaguchi
- Assignee: Tosoh Corporation
- Current Assignee: Tosoh Corporation
- Current Assignee Address: JP Yamaguchi
- Agency: Westerman, Hattori, Daniels & Adrian, LLP
- Priority: JP2008-316211 20081211; JP2009-028151 20090210; JP2009-199874 20090831
- International Application: PCT/JP2009/070504 WO 20091208
- International Announcement: WO2010/067782 WO 20100617
- Main IPC: B32B5/16
- IPC: B32B5/16

Abstract:
A subject for the invention is to provide a process for ceramic bead production in which ceramic beads with smooth surfaces are obtained by a simpler method without using a complicated process involving, for example, a DC plasma/radio-frequency plasma combination or a two-stage radio-frequency plasma. Another subject is to provide such ceramic beads. The invention relates to a technique in which a preheated raw ceramic material is introduced into a laminar-flow thermal plasma obtained using a high-voltage type direct-current (DC) plasma gun and is cooled and solidified and the resultant ceramic beads are collected. It is preferred that the raw ceramic material should be preheated by passing the raw material through a refractory tube which runs through a furnace, while sending the raw ceramic material with a carrier gas, and that the preheated raw-material powder should be introduced into and treated with the thermal plasma under such conditions that the resultant ceramic beads are discharged from the thermal plasma at a discharge angle of 60° or larger with the thermal plasma. Thus, satisfactory ceramic beads which have smooth surfaces and have few crack defects and few internal void defects are obtained.
Public/Granted literature
- US20110244239A1 CERAMIC BEADS WITH SMOOTH SURFACES AND PROCESS FOR PRODUCING THE SAME Public/Granted day:2011-10-06
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