CAJ | 학술논문

采用水热法制备钴微米颗粒,通过 X 射线衍射仪、扫描电镜和振动样品磁强计对颗粒的相结构、形貌及磁性能进行表征。结果表明,颗粒为密排六方结构的单质钴,粒径3~5μm,内部呈中空结构,饱和磁化强度为161A·m2/kg。以中空钴微米颗粒为悬浮相,以硅油为基液,制备颗粒体积分数为12%的磁流变液。测试结果表明,基于中空钴微米颗粒的磁流变液的磁致剪切屈服强度在250kA/m 磁场下达到37 kPa,剪切应力的时间稳定性、长期静置的沉降稳定性等均优于同体积浓度的羰基铁粉磁流变液。
채용수열법제비고미미과립,통과 X 사선연사의、소묘전경화진동양품자강계대과립적상결구、형모급자성능진행표정。결과표명,과립위밀배륙방결구적단질고,립경3~5μm,내부정중공결구,포화자화강도위161A·m2/kg。이중공고미미과립위현부상,이규유위기액,제비과립체적분수위12%적자류변액。측시결과표명,기우중공고미미과립적자류변액적자치전절굴복강도재250kA/m 자장하체도37 kPa,전절응력적시간은정성、장기정치적침강은정성등균우우동체적농도적탄기철분자류변액。
Cobalt particles were prepared by hydrothermal method.Their composition,morphology,and mag-netic property were analyzed by X-ray diffractometer,scanning electron microscope and vibrating sample mag-netometer,respectively.The results indicated the composition of the particles was pure cobalt with close-packed hexagonal structure.The particles presented hollow structure with particle size distributed in the range of 3 to 5 micrometers.The saturation magnetization of the particles was 161A·m2/kg,which was close to that of carbonyl iron particle (CIP).Magnetorheological (MR)fluids were prepared with the hollow cobalt particle (HCP),the volume fraction of which was 12%,and silicone oil.Their properties were tested,the results of which indicated that the MR fluids presented a field-induced yield stress of 3 7 kPa.Their shear stress stability with time at constant shear rate,and sedimentation stability during long time standing was better than that of the MR fluids based on carbonyl iron particles with the same volume fraction.