Accession Number : AD0803910

Title :   DEVELOPMENT OF A HIGH TEMPERATURE LIQUID METAL SOLUTION CALORIMETER.

Descriptive Note : Technical rept. Jul 65-Sep 66,

Corporate Author : DENVER RESEARCH INST CO

Personal Author(s) : Pool, Monte J. ; Guadagno, J. Richard

Report Date : OCT 1966

Pagination or Media Count : 24

Abstract : The object of this project was to design and construct a liquid metal solution calorimeter capable of ooerating at temperatures up to 1300 C. A variety of solvents, including tin, uranium, lanthanum, glasses, and certain organic salts can be used, permitting thermodynamic analysis of nearly all alloys and many inorganic compounds, including such materials as steels, refractory metal alloys, carbides, borides, and silicides. Because of the high temperatures involved, interior parts are made of refractory metals and ceramics. A block of beryllia is employed as a heat sink, and high purity alumina is used for other parts. Heat is supplied through molybdenum wire resistance windings and controlled by a proportioning controller. Temperatures are measured with W-3% Re vs. W-25% Re thermocouples. A 48-junction thermopile of the same material detects temperature changes in the solvent bath due to solution of a sample; resulting signal is amplified and recorded automatically. Insulation composed of alternate layers of nickel foil and Fibrefrax paper, which, like the remainder of the calorimeter, operates in vacuum, helps reduce the size of the apparatus. A semi-automatic system for insertion and removal of the bath permits such operations without breaking vacuum or reducing the calorimeter temperature. Samples can be dropped from temperatures ranging from -195 to 1200 C, in either vacuum or inert gas atmosphere. (Author)

Descriptors :   *LIQUID METALS), (*CALORIMETERS, (*THERMODYNAMICS, INORGANIC COMPOUNDS), HIGH TEMPERATURE, SOLVENTS, HEAT OF FORMATION, INSTRUMENTATION, MELTING POINT, SOLUTIONS(MIXTURES), PERFORMANCE(ENGINEERING), TEST METHODS, THERMAL CONDUCTIVITY, VACUUM, THERMOCOUPLES, CERAMIC MATERIALS, REFRACTORY METAL ALLOYS, CONTROLLED ATMOSPHERES.

Subject Categories : Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE