Observation of the setting process of unshaped refractory materials by dynamic-mechanical analysis
The American Ceramic Society (Hrsg). Proceedings 17. UNITECR Conference. Westerville, OH, USA: Bulletin-Archive 2022 7 S.
Erscheinungsjahr: 2022
Publikationstyp: Diverses (Konferenzband)
Sprache: Englisch
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Inhaltszusammenfassung
The investigation of the stiffening be-havior of unshaped refractories is essential for an adequate lining process. The most com-mon method to monitor the stiffening is to ob-serve the propagation of ultrasonic waves in the material over time. However, this method is not applicable for every refractory system. In some cases, it could be shown that the propagation of the ultrasonic waves does not directly correlate with the increase of the me-chanical strength and thus the real hardening of th...The investigation of the stiffening be-havior of unshaped refractories is essential for an adequate lining process. The most com-mon method to monitor the stiffening is to ob-serve the propagation of ultrasonic waves in the material over time. However, this method is not applicable for every refractory system. In some cases, it could be shown that the propagation of the ultrasonic waves does not directly correlate with the increase of the me-chanical strength and thus the real hardening of the mixture. Therefore, an alternative measuring method is presented. The so-called Dynamic-Mechanical Analysis (DMA) pro-vides a new approach for the observation of setting processes. Although originated in the plastics research area, this method can be adapted for inorganic systems as for example unshaped refractories. It allows monitoring the evaluation of the viscoelastic properties of a material as a function of time and tempera-ture, thus representing a powerful tool for time-dependent tracking of the strength-de-velopment during setting processes. In addi-tion, frequency-dependent measurements of-fer the possibility to determine characteristic points in the setting process as for example the gel and the glass point in sol-gel-bonded systems. The suitability of the Dynamic-Me-chanical Analysis for the class of unshaped refractories is shown by means of hydraulic and chemically bonded materials.» weiterlesen» einklappen
Klassifikation
DFG Fachgebiet:
Materialwissenschaft
DDC Sachgruppe:
Ingenieurwissenschaften
