EP0152957A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Method for making ultra-fine ceramic particles
Assignee: Toyota Motor Corp
•
Filing: 1985-02-21
•
Granted: —
•
Expires: 2005-02-21
Abstract
Abstract A method for making uftra-fine ceramic particles, in which metal powder constituting a portion of the ultra-fine ceramic particles intended for production is injected into a plasma jet so that the metal powder is vaporized. The vaporized metal powder is then mixed with a reactive gas, which includes an element constituting the other portion of the ultra-fine ceramic particles, filled in the surrounding area of the plasma jet, and thereby the vaporized metal powder and the reactive gas produce a synthetic reaction. The ultra-fine ceramic particles are produced continuously because of the reaction flame.
Inventors
- 👤 Masahiro Ogawa
- 👤 Susumu Abe
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 23:49
CPC Classifications
C; C01; C01B; C01B32/00; C01B32/90; B; B01; B01J; B01J12/00; B01J12/002; B82; B82Y; B82Y30/00; C01B13/00; C01B13/14; C01B13/20; C01B21/00; C01B21/06; C01B33/00; C01B33/113; C01B33/12; C01B33/18; C01B33/181; C01B21/0602; C01B21/0612; C01B21/0615; C01B21/0617; C01B21/062; C01B21/0637; C01B21/068; C01B21/072; C01B21/076; C01P; C01P2004/00; C01P2004/60; C01P2004/64
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
93 words
A method for producing ultra-fine ceramic particles comprising the steps of forming a plasma jet in a reaction gas atmosphere containing an element consituting a portion of the intended ultra-fine ceramic particles, introducing a metal powder constituting the other portion of said intended ultra-fine ceramic particles into said plasma jet to vaporize said metal powder by the heat of said plasma jet and to react the resulting vaporized said metal with said element contained in said reaction gas atmosphere for synthesizing said intended ultra-fine ceramic particles, and gathering the resulting ultra-fine ceramic particles.
Claim 2
Independent Claim
93 words
A method for producing ultra-fine ceramic particles comprising the steps of forming a plasma jet in a reaction gas atmosphere containing an element consituting a portion of the intended ultra-fine ceramic particles, introducing a metal powder constituting the other portion of said intended ultra-fine ceramic particles into said plasma jet to vaporize said metal powder by the heat of said plasma jet and to react the resulting vaporized said metal with said element contained in said reaction gas atmosphere for synthesizing said intended ultra-fine ceramic particles, and gathering the resulting ultra-fine ceramic particles.
Claim 3
Dependent Claim
33 words
A method according to claim 1, wherein the metal forming said metal powder is one selected from the group consisting of silicon, titanium, zinc, magnesium, manganese, chromium, vanadium, aluminum and a mixture thereof.
Claim 4
Dependent Claim
20 words
A method according to claim 1, wherein the particle size of said metal powder is not more than 400 microns.
Claim 5
Dependent Claim
20 words
A method according to claim 1, wherein said element is one selected from the group consisting oxygen, nitrogen, and carbon.
Claim 6
Dependent Claim
30 words
A method according to claim 1, wherein said reaction gas is one selected from the group consisting of gaseous oxygen, gaseous nitrogen, gaseous ammonium, gaseous hydrocarbon and a mixture thereof.
Claim 7
Dependent Claim
26 words
A method according to claim 1, wherein the rate of injecting said metal powder into said plasma jet is not less than 70 grams per minute.
Claim 8
Dependent Claim
17 words
method according to claim 1, wherein said metal powder is injected by means of a carrier gas.
Claim 9
Dependent Claim
27 words
i method according to claim 7, wherein said carrier gas is one selected from the group consisting of reaction gas and inert gas and a mixture thereof.
Claim 10
Dependent Claim
17 words
A method according to claim 1, wherein said metal powder is continuously injected into said plasma jet.
Claim 11
Dependent Claim
23 words
A method according to claim 1, wherein said metal powder is intermittently injected into said plasma jet at intervals not exceeding 1 second.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.