Depositing carbon on high-temperature substrate that is kept in motion by vibration produces isotropic pyrolytic graphite or carbon without using fluidized beds

Shimizu, H.

English

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1972	 1	 B72-10029 
•	 NASA TECH BRIEF 
Ames Research Center	
-4 
NASA Tech Briefs announce new technology derived from the U.S. space program. They are issued to encourage 
commercial application. Tech Briefs are available on a aubscription basis from the National Technical Information 
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be directed to the Technology Utilization Office, NASA, Code KT, Washington, D. f. 20546. 
Isotropic Pyrolytic Carbons 
The problem: 
To produce isotropic pyrolytic graphite or carbon 
without the use of fluidized beds. 
The solution: 
Deposit carbon on a high-temperature substrate 
that is kept in motion by vibration. 
How it's done: 
Methane or other hydrocarbon gas is passed over 
a heated bed of high-temperature particles kept in 
. agitation by direct or indirect coupling to an electro-
mechanical vibrator or an ultrasonic transducer. The 
collisions of particles prevent the orderly columnar 
deposition of pyrolytic graphite; as a result, the de-
posits are isotropic with respect to many thermal and 
mechanical properties. Isotropic carbon is especially 
resistant to thermal shock and spalling. 
The frequency of vibration used in this novel 
method for preparing isotropic carbon may range 
from subsonic through ultrasonic frequencies, and 
the substrate temperature may range from the lower
pyrolytic carbon deposition temperatures to the upper 
pyrolytic graphite deposition temperatures. More-
over, unlike fluidized bed techniques, the substrate 
can be brought to the deposition temperature by any 
suitable technique including indirect or direct in-
duction and resistive heating. 
Note: 
No additional information is available. Specific 
questions, however, may be directed to: 
Technology Utilization Officer 
Ames Research Center 
Moffett Field, California 94035 
Reference: B72-10029 
Patent status: 
No patent action is contemplated by NASA. 
Source: H. Shimizu of 
The Marquardt Company 
under contract to

Ames Research Center

(ARC-10532) 
Category 04 
This document was prepared under the sponsorship of the National
	 Government assumes any liability resulting from the use of the 
Aeronautics and Space Administration. Neither the United States
	 information contained in this document, or warrants that such use 
Government nor any person acting on behalf of the United States
	 will be free from privately owned rights.
https://ntrs.nasa.gov/search.jsp?R=19720000029 2020-03-17T03:23:50+00:00Z


Isotropic pyrolytic carbons

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