| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of manufacturing a hollow metal body having excellent external surface free from explosion marks. SOLUTION: The method of manufacturing the hollow metal body composed of sintered metal comprises: a coating step in which a solution containing a raw material powder of metal oxide and a binder is applied onto an external surface of a central core material and then dried to form a coating layer of the raw material powder on the external surface of the central core material; a step of thermal decomposition/vaporization of the central core material in which the central core material having the coating layer of the raw material powder is heated at 250 to 400°C in the atmosphere or in an inert-gas atmosphere free from reducing gas and is dissipated by thermal decomposition/vaporization to obtain a hollow shell made of the remaining coating layer; a roasting step in which the shell obtained in the thermal decomposition/vaporization step is heated at 800 to 1,100°C in the atmosphere or in an oxidizing gas atmosphere; and a reduction/sintering step in which the shell passed through the roasting step is heated at 1,000 to 1,300°C in a reducing gas atmosphere containing hydrogen and/or carbon to undergo reduction/sintering. COPYRIGHT: (C)2008,JPO&INPIT
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