Valve with embedded fine particles of diamond in the metal surface of the valve seat resists galling, corrosion, erosion, and cold welding. Diamond powder has an average particle diameter of 0.01 micron and is used with a standard fine diamond polishing compound

Macglashan, W. F., Jr.

English

NASA Technical Reports Server

For Resistance To	 For Erosion and 
Corrosion, Cold	 Particle Impact 
Welding, and Galling 	 Resistance 
September 1970	 Brief 70-10202 
NASA TECH BRIEF 
.'J	 - 
NASA Tech Briefs announce new technology derived from the U .S. space program. They are issued to encourage comnieri.iI 
application. Tech Briefs are available on a subscription basis from the Clearinghouse for Federal Scientific and Technical 
Information, Springfield, Virginia 22151. Requests for individual copies or questions relating to the Tech Brief program may 
be directed to the Technology Utilization Division, NASA. Code UT, Washington, D.C. 20546. 
Surface Treatment for Valve Seats 
Surfaces 
-3--' 
100 A S	 (0.01 Micron) Diamond
c7c' c? 
cZ?( 
1/4 Micron	 Metal 
Diamond	 Matrix
(...J'. 
ego 
100 
1/4 Micron (0.01 Micron) Diamond Diamond 
For Combination 
Corrosion and 
Particle Impact 
Resistance 
Surface Cross-Sections 
	
A valve with greatly increased resistance to galling, 	 micron. The powder may be used plain or suspended 
	
corrosion, erosion, and cold welding has been pro- 	 in a grease vehicle of the type generally used with 
	
duced by embedding fine particles of diamond in the	 lapping compounds. 
	
metal surface of the valve seat. This treatment, which 	 The diamond powder is embedded in the metal 
	
has greatly improved the reliability and lifetime of the 	 surface mechanically, by spreading the powder on the 
	
valve, may be used with a wide variety of metals in	 surface and applying pressure. When treating valve 
many different applications,	 seats, it has been found advantageous to use a hard-
	
A newly available ultra-fine diamond powder having	 ened ball of sapphire or sintered carbide the same 
	
an average particle diameter of 0.01 micron is used,
	 shape as the ball used to lap the valve seat. The ball 
	
together with a standard fine diamond polishing corn- 	 is brush coated with the diamond compound, set in 
	
pound having an average particle diameter of 0.25 	 place in the valve seat, and pressed or tapped re-
m(continued overleaf) 
This document was prepared under the sponsorship of the National
	 Governmtht 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=19700000195 2020-03-17T00:13:12+00:00Z
peatedly to embed the diamond particles. This tech-
nique may be used with diamond particles up to about 
45 microns in diameter. 
A surface treated with the ultra-fine diamond 
powder shows increased resistance to corrosion, galling 
and cold welding; treated with the larger particles it 
shows increased resistance to erosion and particle 
impact damage. Sequential treatment with both sizes 
of particles can produce a surface with an optimum 
combination of both sets of properties. 
Note: 
Requests for further information may be directed to: 
Technology Utilization Officer 
NASA Pasadena Office 
4800 Oak Grove Drive 
Pasadena, California 91103 
Reference: TSP70-10202
Patent status: 
This invention is owned by NASA, and a patent

application has been filed. Royalty-free, nonexclusive

licenses for its commercial use will be granted by

NASA. Inquiries concerning license rights should be

made to NASA, Code GP, Washington, D.C. 20546.

Source: W. F. MacGlashan, Jr. of

Caltech/JPL
under contract to

NASA Pasadena Office

(NPO- 10779) 
Brief 70-10202	 Category 08


Surface treatment for valve seats

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