Accession Number:

AD0744287

Title:

Effect of Thermal Radiation on the Expansion and Contraction of Molding Sands,

Descriptive Note:

Corporate Author:

FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s):

Report Date:

1972-02-17

Pagination or Media Count:

21.0

Abstract:

The volumetric changes of the modeling sands based on quartz sand were measured dilatometrically. The samples studied were mixtures of quartz sands of various orgin with one of the following bonding agents bentonite, clay, or quartz powder, and additives coal powder or turf. The dependence of expansion on the temperature is for all mixtures similar with two pronounced regions strong expansion up to 573 degrees the transformation of beta-quartz to alpha-quartz and irreversible contraction at temperature of approximately 870 degrees the transformation of alpha-quartz to alpha-tridymite. The expansion of mixtures as compared with quartz sand is smaller. Author

Subject Categories:

  • Manufacturing and Industrial Engineering and Control of Production Systems

Distribution Statement:

APPROVED FOR PUBLIC RELEASE