General procedure and molding sand composition for preparing molds usable for casting variety of alloys are developed. Molds are prepared from mixture of sand, sodium silicate binder, and organic liquid ester. Castings of radiographic quality are produced from various alloys

Fontes, M. J.

Kourtides, D.

Leibfritz, E. R.

English

NASA Technical Reports Server

December 1970	 Brief 70-10512 
NASA TECH BRIEF 
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 progam may be directed to the Tech-
nology Utilization Division, NASA, Code UT, Washington, D.C. 20546. 
Molding Procedure for Casting a Variety of Alloys 
The problem: 
To develop a general procedure and a molding sand 
composition for preparing molds that can be used for 
casting a variety of alloys. 
The solution: 
Molds prepared in accordance with a standardized 
procedure from a mixture of sand and a self-setting 
binder system of the following composition, in pounds: 
How it's done: 
The sand and the sodium silicate binder are blended 
in a suitable mixer until all silicate lumps have dis-
appeared (5 to 10 minutes). The ester is added, and 
blended into the mixture (about 1 minute). The com-
position is placed in the molding flask containing 
the pattern. The composition starts to set within 30 
minutes and is hard within 2 to 3 hours. At the end of 
this period, the molds are heated at 250F for 2 hours 
to eliminate any moisture, and the pattern is removed. 
The cope and drag are closed prior to pouring metal. 
Notes: 
1. The ester accelerates the setting and hardening 
of the sand and binder.
2. The proper directional solidification of castings 
is achieved by conventional techniques with gates 
and risers. 
3. Castings which have been made using this molding 
procedure are in the 1- to 100-pound range with 
section thicknesses of 1/8 to 3 inches. The castings 
are machined to achieve proper finish and dimen-
sions. 
4. Castings of radiographic quality have been pro-
duced from the following alloys: 309 stainless 
steel, 174PH stainless steel, Waspaloy PWA-652, 
Hastelloy GMR-235D, lnconel 625, Aluminum 195, 
356, KO-i, Berylco 33-20C, and Navy bronze. 
Many other alloys could be used with this process. 
5. No additional documentation is available. Specific 
questions, however, may be directed to: 
Technology Utilization Officer 
Ames Research Center 
Moffett Field, California 94035 
Reference: B70-10512 
Patent status: 
No patent action is contemplated by NASA. 
Source: D. Kourtides, M. J. Fontes, and 
E. R. Leibfritz 
Ames Research Center 
(ARC-10358) 
100, sand GFN 50-70 
•	 3, sodium silicate binder (liquid) 
0.4, organic liquid ester
Category 08 
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=19700000494 2020-03-17T00:34:14+00:00Z


Molding procedure for casting a variety of alloys

Abstract

Similar works

Full text

Available Versions

NASA Technical Reports Server