当外磁场施加在由铁磁性Ni和非磁性ZrO2粒子组成的浆料时, 浆料的粘度会明显增大. 实验采用磁场线圈、旋转粘度计和金相显微镜对磁场中Ni/ZrO2复合浆料的粘度与内部结构的关系进行了系统研究. 结果表明, 浆料粘度随着磁场强度和Ni含量的增加而增大. 当外磁场作用于浆料时, 浆料中会形成链状Ni团簇. 随着磁场强度的增加, Ni团簇尺寸变大, 阻碍了粒子的自由运动, 因此粘度增加. 同样, 随着Ni含量的增大, 浆料中Ni团簇增多, 因此粘度增大.
When an external magnetic field was applied on the suspension composed of ferromagnetic Ni and nonmagnetic ZrO2 particles, the viscosity of the suspension increased drastically. The relation of viscosity and inner structure of suspension was investigated by using magnetic coils, rotational viscometer and optical microscope. The results show that the viscosity increases with the magnetic field strength and Ni content increasing because of the formation of chain-like clusters in the suspension. As the magnetic field increases, Ni clusters become larger, which hinders the free move of particles, so the viscosity increases. Similarly, Ni clusters in the suspension increase with Ni content increasing, and hence the viscosity increases.
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