The reaction precursors were synthesised by solid state reaction of H 2C 2O 4·2H 2O with NiSO 4·6H 2O and Fe(NO 3) 3·9H 2O,CuSO 4·5H 2O,at room temperature.The brown black nanomater Ni 1.5 FeCu 2.5...The reaction precursors were synthesised by solid state reaction of H 2C 2O 4·2H 2O with NiSO 4·6H 2O and Fe(NO 3) 3·9H 2O,CuSO 4·5H 2O,at room temperature.The brown black nanomater Ni 1.5 FeCu 2.5 O 5.5 with the averages of 60nm was obtained by decomposition of precursors CuC 2O 4·2H 2O,Fe 2(C 2O 4) 3·5H 2O,and NiC 2O 4·2H 2O for about 3 hour at 410℃.The composition,size,appearance and properties of the product was studied by TG,XRD,TEM and SEM.展开更多
The CaO doped 10NiO-NiFe2O4 composite ceramics were prepared by the cold isostatic pressing-sintering process, and the effects of CaO content on the phase composition, mechanical property and thermal shock resistance ...The CaO doped 10NiO-NiFe2O4 composite ceramics were prepared by the cold isostatic pressing-sintering process, and the effects of CaO content on the phase composition, mechanical property and thermal shock resistance of 10NiO-NiFe2O4 composite ceramics were studied. The results show that the samples mainly consist of NiO and NiFe2O4 when content of CaO is less than 4%(mass fraction), bending strength increases obviously by CaO doping. Bending strength of the samples doped with 2% CaO is above 185 MPa, but that of the samples without CaO is only 60 MPa. Fracture toughness is improved obviously by CaO doping, the samples doped with 2% CaO have the maximum fracture toughness of 2.12 MPa ·m1/2 , which is about two times of that of the undoped ceramics. CaO doping is bad to thermal shock resistance of 10NiO-NiFe2O4 composite ceramics.展开更多
文摘The reaction precursors were synthesised by solid state reaction of H 2C 2O 4·2H 2O with NiSO 4·6H 2O and Fe(NO 3) 3·9H 2O,CuSO 4·5H 2O,at room temperature.The brown black nanomater Ni 1.5 FeCu 2.5 O 5.5 with the averages of 60nm was obtained by decomposition of precursors CuC 2O 4·2H 2O,Fe 2(C 2O 4) 3·5H 2O,and NiC 2O 4·2H 2O for about 3 hour at 410℃.The composition,size,appearance and properties of the product was studied by TG,XRD,TEM and SEM.
基金Project(2005CB623703) supported by the National Basic Research Program of China
文摘The CaO doped 10NiO-NiFe2O4 composite ceramics were prepared by the cold isostatic pressing-sintering process, and the effects of CaO content on the phase composition, mechanical property and thermal shock resistance of 10NiO-NiFe2O4 composite ceramics were studied. The results show that the samples mainly consist of NiO and NiFe2O4 when content of CaO is less than 4%(mass fraction), bending strength increases obviously by CaO doping. Bending strength of the samples doped with 2% CaO is above 185 MPa, but that of the samples without CaO is only 60 MPa. Fracture toughness is improved obviously by CaO doping, the samples doped with 2% CaO have the maximum fracture toughness of 2.12 MPa ·m1/2 , which is about two times of that of the undoped ceramics. CaO doping is bad to thermal shock resistance of 10NiO-NiFe2O4 composite ceramics.
