Plasma-arc spraying offers method of preparing required surface at greatly reduced cost. Coarse-grained, tungsten carbide bonded-nickel coating is applied by spraying. Coating has been used successfully on wedge-shaped mechanical test grips

Stevens, E. G.

English

NASA Technical Reports Server

August 1973
	
B73-10234 
•	 NASA TECH BRIEF 
Lyndon B. Johnson Space Center 
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 subscription basis from the National Technical Information 
Service, Springfield, Virginia 22151. Requests for individual copies or questions relating to the Tech Brief program may 
be directed to the Technology Utilization Office, NASA, Code KT, Washington, D.C. 20546. 
High-Friction Mechanical Grips 
The problem: 
Mechanical-grip friction surfaces are usually machined 
to a high-friction finish by multiple serrations. The 
high-friction finishes produced by this method may be 
relatively expensive. 
The solution: 
Plasma-arc spraying offers a method of preparing the 
required surface at a greatly reduced cost. 
S
How it's done: 
A coarse-grained, tungsten carbide bonded-nickel 
coating is applied by plasma-arc spraying. This coating 
has been used successfully on wedge-shaped mechanical 
test grips. 
The test grip shown in the illustration demonstrates 
plasma-arc-sprayed coatings. These grips were proof 
tested to a 150,000-pound (670,000-newton) pull. This 
indicates that they may be used for 100,000-pound 
(450,000-newton) laboratory tests. 
Note: 
No further documentation is available. 
	
Specimen in Tensile or 	 High Friction Coating on 
	
Fatigue Test Setup	 These Surfaces of the 
Friction Grips
Patent status: 
NASA has decided not to apply for a patent. 
Source: E. G. Stevens of
Rockwell International Corp.
under contract to

Johnson Space Center 
(MSC-19260) 
0 Wedge-Shaped Grip With Plasma-Arc-Sprayed Coating
Category 06 
This document was prepared under the sponsorship of the National
	 Government assumes any liability resulting from the u
	 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.
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High-friction mechanical grips

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