Accession Number : AD0744287

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

Corporate Author : FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Szreniawski,Janusz

Report Date : 17 FEB 1972

Pagination or Media Count : 21

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)

Descriptors :   (*SAND, THERMAL STRESSES), (*CASTING, SAND), BONDING, QUARTZ, ADDITIVES, THERMAL EXPANSION, CONTRACTION, DILATOMETERS, POLAND

Subject Categories : Mfg & Industrial Eng & Control of Product Sys

Distribution Statement : APPROVED FOR PUBLIC RELEASE