Precise expansion/shrinkage measurements in routine operation
DIL 402 PC - Horizontal pushrod dilatometer
The primary target applications for the Dilatometer 402 PC are material development, quality control and failure analysis in ceramic materials, composites, metals and alloys.
Accuracy: Polycrystalline Alumina
Presented in the figure is a comparison of three test runs (lines) on a polycrystalline alumina (aluminum oxide) with the corresponding literature values (crosses) between room temperature and 1575°C. No visible deviations exist between the individual curves. Evaluation of the thermal expansion values at 500°C, 1000°C and 1500°C clearly shows that the measurement results are within 1% of the corresponding literature values. This test proves the outstanding reproducibility and accuracy of the new dilatometer.
Glass
Coefficients of thermal expansion (CTE), glass transition temperatures and softening points are crucial parameters for the characterization of glass materials. Presented in the figure are three tests on same type of glass but from different batches. It can clearly be seen that the coefficients of thermal expansion are in good agreement within the instrument’s uncertainty boundaries. The glass transition temperature and the softening point of sample #3 (blue curve) show slightly lower values, indicating a slightly different composition.
Sintering of Zirconia
During the production of high-tech ceramics, a ceramic powder is mixed with a binder and pressed to a green body. By thermal treatment the binder is removed (burned out) and the ceramic is sintered to the final part. In order to determine the quality of the final part, the binder burnout and sintering temperatures as well as the shrinkage during sintering have to be known. These properties can be measured quickly and easily using pushrod dilatometry. Presented in the figure are tests on an yttria-stabilized zirconia green body and on the sintered ceramic.
Production of Cordierite Ceramic
Cordierite is a popular magnesia-alumina-silica ceramic used in various kinds of industrial applications. It is used, for example, as a carrier for catalysts in the automotive industry. During the production of this ceramic, various raw materials are ground and mixed to form a green body. During firing under oxidizing atmospheres, the organic additives are burned out and the cordierite phase is formed at high temperatures. Using the DIL 402 PC in combination with the c-DTA® software, the production process can be analyzed in detail.
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