Four‐Point Bending Tests at High Temperatures on Commercial MgO‐C Refractory Bricks with and Without Recyclate Considering Different Carbon Contents

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Abstract
Given the growing emphasis on refractory recycling, the performance characteristics of commercial MgO‐C bricks incorporating MgO‐C recyclates are of considerable economic and environmental relevance. In the present study, four‐point bending tests are conducted in an argon atmosphere on three commercial MgO‐C brick grades over a temperature range from room temperature to 1300 °C. One MgO‐C brick grade is produced exclusively from virgin raw materials, whereas the other two grades incorporate MgO‐C recyclate at a high mass fraction of 47.5 wt%. Due to the different sources of the recyclates, their carbon contents vary, resulting in different total carbon contents in the two MgO‐C brick grades containing recyclate. Post‐mortem SEM investigations show predominantly transgranular fracture through the MgO‐C recyclates. The evaluation of the four‐point bending tests reveals no detrimental effect of the MgO‐C recyclates on bending strength. Instead, a decisive influence of the total carbon content is observed, with lower total carbon contents correlating with higher bending strength values. Furthermore, the heterogeneous structure of the MgO‐C recyclates contributes to enhanced stress dissipation caused by anelastic deformation processes in the respective MgO‐C brick grades, despite the accompanying decrease in virgin flake graphite content.
Funding Information
  • Deutsche Forschungsgemeinschaft (461482547)

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