The effect of different natural flake graphite additions on the high-temperature properties of a dolomite-carbon refractory
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The effect of different natural flake graphite additions on the high-temperature properties of a dolomite-carbon refractory

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    "The Bureau of Mines investigated the role of imported natural flake graphite in dolomite-carbon refractories used in steelmaking processes. Fundamental engineering data were obtained to enable the evaluation of substitute materials. Changes in oxidation resistance (2,000 deg f), hot strength (2,750 deg f), and deformation under load (2,750 deg f) caused by 10-wt-pct additions of five different kinds of natural flake graphite and increasing quantities (0 to 30 pct) of a 90-pct-carbon natural flake graphite were studied. Results indicated that carbon purity of 10-wt-pct-graphite additions did not influence hot strength deformation under load. When the quantity of 90-pct-carbon graphite addition varied between 0 and 30 wt pct in a dolomite-carbon brick, hot strength was highest and deformation under load lowest with 10-wt-pct additions. As hot strength test temperature was increased from 500 deg to 2,750 deg f, the strength difference observed between 0- and 30-wt-pct additions of a 90-pct-carbon graphite became smaller. Additions of a boron- treated graphite caused significantly higher strength and lower deformation under load at high temperatures, while an addition of ball clay significantly reduced strength and increased deformation." - NIOSTHTIC-2

    NIOSHTIC no. 10005855

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    12 numbered pages
  • NIOSHTIC Number:
    10005855
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    RI 9111
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