ASSESSMENT OF THE EFFICACY OF SOME CARBONATE MINERALS AS ENERGIZERS IN PACK CARBURISATION OF MILD STEEL
DOI:
https://doi.org/10.4314/njt.111.400Abstract
The efficacy of some carbonate minerals (marble, limestone and dolomite) as energizers in pack-caburisation of mild steel has been compared with that of barium carbonate. Mild steel samples were pack-carburised for suitable lengths of time at 9000C in carburising compounds containing charcoal plus varying amounts (up to a maximum of 20%) of BaCo3 and/or either marble, limestone or dolomite as energizers. The resultant carburisation depths obtained with different compounds were compared by means of hardness measurements using a microhardness testing .machine. The results showed that BaC03 can almost be completely substituted with marble or limestone, and that a combination of BaC03 and marble was a more effective energizer than solely Baco3; whereas dolomite was the least effective energizer. The deepest and best3defined case was obtained with a combination of 15% marble and 5% BaC03•
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