ugg stivali NdFeB PA _1825 Rheological Properties

NdFeB / PA rheological properties of composite materials

differenttemperalllres Sichuan University (7 - Process Science) Volume 37 This is because the system has a continuous phase of a nylon binder with the temperature, the viscosity reducing properties. Temperature, on the one hand binder of macromolecular chains tend to be flat, on the other hand increased repulsion between the macromolecular chains, the molecular distance increases, and the material within the formation of more free volume and molecular chain favor of nylon section activities, the addition of magnetic powder particles accelerated to increase the viscosity decreases with temperature level. Can be seen from Figure 4,[link widoczny dla zalogowanych], the temperature on the viscosity of bonded NdFeB in the low shear rates was particularly evident, with the shear rate increased temperature on the viscosity of Bonded NdFeB weakened. Bonded NdFeB test in the temperature range,[link widoczny dla zalogowanych], its viscosity can be used with the temperature dependence of Arrhenius equation: r / 0 () = Ke where () is the temperature of the zero shear viscosity; K for the material constant, K = (a ��); E said the flow activation energy, in units of J �� mol ~. Flow activation energy is reflected both ease of material flow,[link widoczny dla zalogowanych], a parameter, more importantly, to reflect material changes in the temperature dependence of viscosity is an important parameter. Flow activation energy on the shear rate), greater relevance, generally with the shear rate) increases, reduced. The results can be extrapolated from the above, bonded NdFeB in the injection molding process, the change in injection pressure, injection molding than a change of temperature on the bonded NdFeB melt fluidity more effective. 4) in the high shear rate, change the Bonded NdFeB melt shear stress ratio effect of temperature on mobility more effectively; in the process of injection molding, rapid injection or high-pressure injection is more effective than the injection temperature good. References: [1] Lutongjian, Guanhongyu, Liying. StudyontheinjectionmoldingofNdFdBplasticsmagnets [J]. EngineeringPlasticsApplying, 2003 (10): 35 ~ 36. [Lu Tong Jian, Guan Hongyu, Li Ying, et al. Injection molding plastic bonded magnets of NdFeB [J]. Applied Engineering Plastics, 2003 (10): 35 ~ 36. ] [2] MomkaG. Garrel1. MechanicalpropertiesofNylonbondedNd-Fe-Bpermanentmagne ~ [J]. JournalofMagnetismandMag-neticMaterials, 2003,[link widoczny dla zalogowanych],257:32 ~ 33. [3] WU Wow, Wu Jingan. Polymer Rheology [M]. Beijing: Higher Education Press. [4] Liyimin,[link widoczny dla zalogowanych], Quxuanhui, Lizhilin. EffectofpowderloadingonfeedstockviscosityandmechanicalpropertiesofMIMW-Ni-Fealloy [J]. Raremetals, 1999 (1): 21 ~ 22. [Li Yimin, QU Xuan-hui, Li ZL, et al. Powder loading on the W-Ni-FeMIM 3 Conclusion alloy feedstock viscosity and mechanical properties [J]. Metals, 1999 (1): 21 ~ 22. ] 1) Bonded NdFeB are pseudoplastic fluid, in the same component, under the same temperature as the shear rate increases, Bonded NdFeB liquid feeding system increases, viscosity decreases; 2) flow of the feed system of bonded NdFeB constitutive equation, to meet the Ostwald-deWale power law equation model; 3) Bonded NdFeB apparent viscosity decreased with increasing temperature, similar to their regular nylon binder . But in the high shear rate and temperature on the apparent viscosity decreased; [5] FrankelNA, AcrivosA. Ontheviscosityofaconcentratedsus-pensionofsolidspheres [J]. ChemE-SSci, 1967,22:847 ~ 853. [6] AgassantJF, AvenasP. Polymerprocessing-principlesandrood-elling [M]. Munich: Hanserpublishers, 1991.341 ~ 360. (Edit Huang dxllI)

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