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公开(公告)号:US4751070A
公开(公告)日:1988-06-14
申请号:US852470
申请日:1986-04-15
IPC分类号: C01F5/06 , B01J19/00 , B22F9/22 , C01B13/18 , C01B21/16 , C01B35/04 , C01F7/02 , C01F7/30 , C01G1/02 , C01G23/00 , C01G25/00 , C01G25/02 , C01G49/00 , C01G49/06 , C01G53/00 , C22B5/00 , C22B34/12 , G11B5/706 , H01F1/36 , C01G49/02
CPC分类号: C22B5/00 , C01F7/02 , C01G25/02 , C01G49/009 , C01G49/06 , C22B34/129 , G11B5/70652 , H01F1/36 , C01P2006/42
摘要: Ultrafine particles of ceramic or metallic material are obtained at low temperatures from a nitrate source capable of endothermic decomposition by molecularly combining under a nitrogen atmosphere the nitrate source with an inorganic reducing fuel compound, such as hydrazine, to provide a chemical precursor for the ceramic or metallic material and then exothermically decomposing the precursor in a controlled atmosphere by heating to a temperature up to about 200.degree. C. below the endothermic decomposition temperature of the nitrate source. The nitrate source is a metal nitrate or a mixture of nitrate salts. Ferrite particles are recovered when the nitrate source is a mixture of nitrate salts containing ferric nitrate in a 2:1 molar ratio with at least one additional metal nitrate.
摘要翻译: 陶瓷或金属材料的超细颗粒在低温下可从能够吸热分解的硝酸盐获得,其在氮气氛下通过在硝酸盐源与无机还原性燃料化合物如肼之间进行分子结合,以提供陶瓷的化学前体 然后通过加热到硝酸盐源的吸热分解温度以下约200℃的温度,在受控气氛中放热分解前体。 硝酸盐源是金属硝酸盐或硝酸盐的混合物。 当硝酸盐源是含有2:1摩尔比的硝酸铁与至少一种另外的金属硝酸盐的硝酸盐的混合物时,回收铁氧体颗粒。