| 摘要 |
PROBLEM TO BE SOLVED: To provide porous microspheres of metal oxides having high strength and its manufacturing method. SOLUTION: After a fine powder of metal oxides is mixed with a fine powder of carbon, the mixture is sintered, pulverized and classified into specified grain sizes. The classified particles are heated in plasma flames to obtain melted spheres, which are further heated in an oxidative atmosphere to remove the carbon powder by vaporization to form pores in the particles and to obtain the porous microspheres having high strength. Alternatively, instead of the carbon powder, a carbon-producing compound is mixed and carbonized with the metal oxide powder, and the powder mixture is subjected to the same processes as above to form pores inside the particles. Alternatively, commercially available metal oxides having pores in their inside and low strength are used and a carbon-producing compound is permeated into the pores and subjected to the same processes as above to obtain porous microspheres having high strength. COPYRIGHT: (C)2005,JPO&NCIPI
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