Thermal Expansion Measurements at High Temperatures: State and Prospects for Enhancing Measurement Accuracy

The review analyzes the current state and prospects for the development of high-temperature dilatometry. Basic definitions and concepts are given. The main types of dilatometers using contact (mechanical) and remote (optical) measurement methods are considered; some specific installations are described. Limiting factors of known methods are analyzed. Technological progress, which produces materials with new properties, requires the creation of approaches to study the characteristics and application possibilities of such materials, as well as, possibly, forecasting the directions of materials science. Techniques that can ensure further progress in high-temperature dilatometry technology are analyzed. This review is addressed to researchers – metrologists, material scientists, physicists working in the field of dilatometry, as well as specialists who create measuring instruments.