Thermal Analysis

Also found in: Acronyms, Wikipedia.

thermal analysis

[′thər·məl ə′nal·ə·səs]
(analytical chemistry)
Analytical techniques developed to continuously monitor physical or chemical changes of a sample which occur as the temperature of a sample is increased or decreased. Thermogravimetry, differential thermal analysis, and differential scanning calorimetry are the principal thermoanalytical methods.
Determining transformations in a metal by observing the temperature-time relationship during uniform cooling or heating; phase tranformations are indicated by irregularities in a smooth curve.

Thermal Analysis


a set of methods for determining the temperatures at which processes involving the liberation or absorption of heat occur. An example of the first type of process is crystallization from a liquid; examples of the second type include melting and thermal dissociation.

The visual method of thermal analysis consists in the measurement of the temperature at which an inhomogeneity first appears or disappears in a medium when the medium is cooled or heated. Typical examples of inhomogeneity are the precipitation of crystals and the disappearance of turbidity in a system of two immiscible liquids. This method is used only for transparent, low-melting substances.

A much more general method is that of plotting temperature-time curves. In this case, a specimen under study is heated or cooled, its temperature is measured at short time intervals, and the results of the measurements are represented graphically by plotting time along the axis of abscissas and temperature along the axis of ordinates. If no transformation occurs, the heating or cooling curve is smooth; transformations are indicated by the appearance of breaks or horizontal arrests in the curves.

Differential thermal analysis is the most accurate method. Here, the specimen under study is heated or cooled together with, and under the same conditions as, a standard specimen that does not undergo transformations under the conditions of the experiment. A temperature-time curve and a curve of the specimen-standard temperature difference as a function of time are plotted on the same graph. A temperature difference occurs whenever the specimen undergoes a transformation involving the absorption or liberation of heat. The nature of the transformation is deduced from the form of the simple heating or cooling curve, and the transformation temperature is precisely determined from the difference curve. Instruments used for recording heating and cooling curves include graphic recording instruments —such as Kurnakov’s automatic pyrometer—electronic automatic potentiometers, and optical pyrometers.

Thermal analysis is used to obtain such quantitative characteristics as phase composition and heats of reaction during the heating or cooling of test specimens. It is widely applied in the study of metal alloys, alloys containing nonmetallic elements, minerals, and other rocks of geological interest.


Tsurinov, G. G. Pirometr N. S. Kurnakova. Moscow, 1953.
Berg, L. G. Vvedenie v termografiiu. Moscow, 1961.
Trudy Isoveshchaniia po termografii. Moscow-Leningrad, 1955.
Trudy II soveshchaniia po termografii. Kazan, 1961.
Trudy III soveshchaniia po termografii. Riga, 1962.


References in periodicals archive ?
Chemists and materials scientists experienced with the thermal analysis of materials describe the reactions and associated mechanisms observed in advanced materials as a function of time and temperature.
Working with the university's Dr Gareth Parkes and Jim Rooney, Prof Charsley has been applying the technique, known as sample controlled thermal analysis, to differential scanning calorimetry.
Differential thermal analysis device is one of the thermal identification and analysis devices, which is used for the determination of enthalpy changes and the value of specific heat capacity of materials at constant pressure in an exothermic or endothermic chemical reaction.
Together with the international Netzsch group, Netzsch Japan will further develop, produce, distribute and service the existing and new Thermal Analysis product lines.
The business, with 30 employees, will be incorporated into Netzsch's analysing and testing division, which develops and manufactures a full high-precision instrument line for thermal analysis and thermophysical Properties measurement and also offers commercial testing services in laboratories.
For each of the jackets, thermal analysis should be carried out and in this way, thermal model where the least loss is experienced should be selected [8].
Simulation thermal analysis allowing engineers to examine card and fan configurations for best cooling solutions, ensuring system optimal functioning and operating environment.
The Thermal Analysis Excellence line comprises two modular systems: a combined thermogravimetric analysis and differential scanning calorimeter system (TGA/DSC 1) and the DSC 1 system, as well as updated STARe thermal analysis software.
Thermal analysis of molten iron is used in almost every iron metalcasting facility, whether it is pouring gray or ductile iron.
Patran integrates the thermal analysis software with the finite element analysis pre- and post-processing capabilities of MSC.
The launch of 2-dimensional thermal probe electrical equipment will be announced at the 42nd meeting of the Japan Society of Calorimetry and Thermal Analysis, being held from October 7-9.