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AssigneesTsunemi Ochiai, Kyushu Refractories Co., Ltd.
InventorsTsunemi Ochiai, Shigeyuki Takanaga
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Refractories obtained by molding a refractory raw material composition containing a refractory raw material including graphite grains having an average grain size of 500 nm or less or a refractory raw material including graphite grains obtained by graphitizing carbon black and a refractory filler. Or refractories containing carbonaceous grains (A) selected from carbon black or graphite grains obtained by graphitizing carbon black and having a DBP absorption (x) of 80 ml/100 g or more, carbonaceous grains (B) selected from carbon black and graphite grains obtained by graphitizing carbon black and having a DBP absorption (x) of less than 80 ml/100 g, and a refractory filler. Refractories excellent in corrosion resistance, oxidation resistance and thermal shock resistance, especially carbon-contained refractories having a low carbon content are thereby provided.
A refractory raw material comprising graphite grains having an average grain size of 500 nm or less.
A refractory raw material comprising graphite grains obtained by graphitizing carbon black.
A process for producing graphite grains containing at least one element selected from metals, boron and silicon, characterized by heating carbon black and an alcoholate of at least one element selected from metals, boron and silicon.
A process for producing graphite grains containing at least one element selected from metals, boron and silicon, characterized by heating carbon black, an oxide of at least one element selected from metals, boron and silicon and a metal reducing the oxide.
A process for producing graphite grains, which comprises heating carbon black and a simple substance of at least one element selected from metals, boron and silicon or a compound containing the element, and further oxidizing the resulting graphite grains.
A refractory raw material composition comprising carbonaceous grains (A) selected from carbon black and graphite grains obtained by graphitizing carbon black and having a DBP absorption (x) of 80 ml/100 g or more, carbonaceous grains (B) selected from carbon black and graphite grains obtained by graphitizing carbon black and having a DBP absorption (x) of less than 80 ml/100 g, and a refractory filler.
Dependencies are inferred from the claim text.