Crystallization in a chamber furnace

Abstract

A model of an air cooler (`cold finger') in a laboratory chamber furnace, for simultaneous regulation of different crystallization rates in a series of Tamman test tubes with the purpose of obtaining crystals, is given.

Test tube for obtaining crystals

“…In previous papers (Cabrić et al, 1997;Cabric & Janicijevic, 2003) we have described a design for air coolers in a laboratory chamber and crucible furnace, respectively, with the aim of regulating the crystallization rates in a column of Tamman test tubes. In this paper, we describe the development and improvement of the interior and exterior of the cooler, i.e.…”

“…The crystallization rate interval in each crucible is regulated by the cross section of the airflow a, i.e. the position on the cooler [see equation 2of Cabric et al, 1990]. The crystallization rate interval in each crucible can also be regulated by the plug height b and the distance of the plug head from the surface of the melt c. The temperature gradient is regulated by the distance d. Different temperature gradients in the crucibles can be simultaneously tested using an inclined cooler.…”

“…Rings and plugs of various numbers, shapes and dimensions can be mounted and thus simultaneously tested. Plugs can be mounted in the mounting holes (or on pegs) of several rings (Cabrić et al, 1997) and slipped over the cooler ('crystallization finger'). By varying the internal and external shape and dimensions of the cooler, a set of 'test tubes-crystallization socket-outlet adaptors' can be modelled for tests over a wider range of crystallization parameters and substances.…”

“…By varying the internal and external shape and dimensions of the cooler, a set of 'test tubes-crystallization socket-outlet adaptors' can be modelled for tests over a wider range of crystallization parameters and substances. The cooler, with several branched Tamman test tubes (Cabric & Janicijevic, 2003), can be installed in a crucible furnace ('crystallization key'). By the use of several coolers [a family group of test tubes ('fingers') in the chamber], the crystallization tests can be expanded to several columns of crystallization rings-plugs, i.e.…”