To　improve　the　resistance　to　oxidation　of　MgO－C　brick　bonded　by　phenolic　resin，silicone　resin　was　tried　to　use　as　a　binder．　Oxidation　of　MgO－C　samples，consisting　of　magnesia，graphite　and　binder，was　tested　at　600-1400℃　and　oxidation　mechanism　was　studied．When　using　phenolic　resin，the　selective　oxidation　of　phenolic　resin　went　on　the　inside　of　the　sample　with　a　slight　oxidation　of　graphite　at　600℃．　Accordingly，even　though　the　graphite　almost　remained　in　the　oxidized　sample，the　structure　became　brittle　loosing　the　bond．At　800℃，the　reaction　surface　of　graphite　was　initially　increased　by　the　selective　oxidation　of　phenolic　resin．Therefore，the　oxidation　at　800℃　was　larger　than　that　at　1000℃． 　When　using　silicone　resin，the　oxidation　was　almost　protected　at　600℃．　The　selective　oxidation　was　not　found　especially　at　800℃，so　that　the　oxidation　of　MgO－C　sample　was　less　than　that　using　phenolic　resin．The　Mixed　resin　which　consists　of　phenolic　resin　and　silicone　resin　in　the　ratio　of　1：1　is　effective　for　oxidation　at　low　temperature．

View full abstract