Multilayer rocket nozzles formed by plasma spraying have good thermal shock resistance and can be reheated in an oxidizing environment without loss of coating adherence. Suggested application of this process are for the production of refractory components, which can be formed as surfaces of revolution

Bliton, J. L.

Rausch, J. L.

English

NASA Technical Reports Server

Ci 
December 1966	 Brief 66-10611 
NASA TECH BRIEF	
a 
NASA Tech Briefs are issued to summarize specific innovations derived from the U.S. space program, 
to encourage their commercial application. Copies are available to the public at 15 cents each 
from the Clearinghouse for Federal Scientific and Technical Information, Springfield, Virginia 22151. 
Multilayer Refractory Nozzles Produced by Plasma-Spray Process 
The problem: 
To fabricate multilayer rocket nozzles that will 
have good thermal shock resistance and can be 
reheated in an oxidizing environment without loss of 
coating adherence. 
The solution: 
The nozzles are formed by plasma spraying an 
interior oxide layer, one or more mixed oxide—tungsten 
grade layers, and an exterior tungsten layer onto a 
two piece, separable mandrel. 
How it's done: 
A two piece mandrel made of type 304 stainless 
steel is used as a base on which the coatings are
applied by plasma spraying. The two pieces of the 
mandrel are held together during the spraying process 
by a thin layer of potassium silicate gel. An un-
threaded doweled portion of one half of the mandrel 
extends through a threaded hole in the other half 
(on right side of illustration) so that a bolt may be 
threaded through this hole to force the two halves 
of the mandrel apart after the spraying process is 
completed. The threaded hole in the other end of 
the mandrel is for a shaft used to rotate the mandrel 
during spraying. A coating of copper, which is ap-
plied to the mandrel by flame spraying and then 
polished, serves as a parting medium.
(continued overleaf( 
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=19660000609 2020-03-11T17:46:23+00:00Z
Commercial spray equipment with a modified feed 
system to eliminate powder spurting in the gas stream 
and dropout in the feedlines was used in fabricating 
four-layer composite nozzles. Spraying of the tungsten 
was .conducted in an inert gas chamber to prevent 
oxidation of the metal. 
Notes: 
I. Suggested applications of this process are for the 
production of refractory components, such as 
nozzles and containers, which can be formed as 
surfaces of revolution.
2. Inquiries concerning this innovation may be di-
rected to: 
Technology Utilization Officer 
Western Support Office 
150 Pico Boulevard 
Santa Monica, California 90406 
Reference: B66-10611 
Patent status: 
No patent action is contemplated by NASA. 
Source: John L. Rausch and J. L. Bliton 
of lIT Research Institute, 
under contract to 
Western Support Office 
(WOO-318) 
Brief 66-10611	 Category 05


Multilayer refractory nozzles produced by plasma-spray process

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