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Summary

This study introduces a specialized high-temperature nuclear magnetic resonance (NMR) setup to measure free moisture in refractory castables. The system accurately quantifies water content during heating, aiding material analysis.

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Area of Science:

  • Materials Science
  • Analytical Chemistry
  • Chemical Engineering

Background:

  • Refractory castables are crucial in high-temperature industrial applications.
  • Understanding moisture behavior during heating is vital for material integrity and performance.
  • Existing methods for in-situ moisture analysis at high temperatures are limited.

Purpose of the Study:

  • To present a novel high-temperature nuclear magnetic resonance (NMR) setup for quantitative free moisture measurement.
  • To enable non-destructive, continuous monitoring of moisture and temperature profiles in refractory castables.
  • To characterize water release mechanisms during the initial heat-up phase.

Main Methods:

  • Development of a specialized high-temperature NMR setup (100-300 °C) using a high thermal-stability Birdcage-coil and a mini-coil.
  • Implementation of a high-temperature correction scheme to calibrate NMR signal changes due to temperature variations.
  • Application of NMR to measure moisture and temperature profiles with 2-3 mm spatial resolution on 74 mm samples.

Main Results:

  • The setup successfully measured quantitative free moisture in monolithic refractory castables during one-sided heating.
  • The system achieved continuous, non-destructive monitoring of moisture and temperature profiles.
  • Post-correction analysis revealed insights into the physical and chemical states of water released from the porous matrix.

Conclusions:

  • The developed high-temperature NMR setup is effective for characterizing moisture in refractory castables.
  • This technique provides valuable data on water behavior during the critical first heat-up, crucial for material development and quality control.
  • The study demonstrates the capability of the setup using a conventional castable model material.