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AssigneeMitsui Engineering & Shipbuilding Co., Ltd.
InventorsToru Degawa, Gen Okuyama, Akio Hashimoto, Seiju Uchida, Kouzou Fujiwara, Makoto Ebata, Takashi Satou, Tohei Ototani
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Ti or a high-Ti alloy is melted in a container composed of high-purity CaO materials on its inner sides. The materials are composed of not less than 99% by weight of CaO, not more than 0.1% by weight of SiO.sub.2, not more than 0.02% by weight of Fe.sub.2 O.sub.3, and not more than 0.5% by weight in total of other metal oxides under a non-oxidizing atmosphere. CaO refractories for use in the melting of Ti or a high-Ti alloy contains not less than 99% by weight of CaO, not more than 0.1% by weight of SiO.sub.2, 0.02% by weight of Fe.sub.2 O.sub.3, and not more than 0.5% by weight of other metal oxides.
A method for melting Ti, comprising melting Ti in a container formed of high-purity CaO materials having the inner sides thereof composed of not less than 99% by weight of CaO, not more than 0.1% by weight of SiO.sub.2, not more than 0.02% by weight of Fe.sub.2 O.sub.3, and not more than 0.5% by weight in total of other metal oxides under a nonoxidizing atmosphere.
A method for melting a high-Ti alloy, comprising melting high-Ti in a container formed of high-purity CaO materials having inner sides thereof composed of not less than 99% by weight of CaO, not more than 0.1% by weight of SiO.sub.2, not more than 0.02% by weight of Fe.sub.2 O.sub.3, and not more than 0.5% by weight in total of other metal oxides under a nonoxidizing atmosphere.
CaO refractories for use in the melting of Ti or a high-Ti alloy, comprising not less than 99% by weight, of CaO not more than 0.1% by weight of SiO.sub.2, not more than 0.02% by weight of Fe.sub.2 O.sub.3, and not more than 0.5% by weight in total of other metal oxides.
Dependencies are inferred from the claim text.