A study of interfacial modification by polysilazane and the effect on magnetic properties of NiFe.
碩士 === 國立臺灣科技大學 === 材料科學與工程系 === 102 === In this study, polysilazane(PSZ) was applied as polymer-derived ceramic (PDC) within NiFe(Pm) particles. The PmPSZ composites were modifying by controlled water hydrolysis to form interface capable of molding magnetic powder under 180°C. Different atmosphere,...
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| Format: | Others |
| Language: | zh-TW |
| Published: |
2014
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| Online Access: | http://ndltd.ncl.edu.tw/handle/97416928434891032691 |
| Summary: | 碩士 === 國立臺灣科技大學 === 材料科學與工程系 === 102 === In this study, polysilazane(PSZ) was applied as polymer-derived ceramic (PDC) within NiFe(Pm) particles. The PmPSZ composites were modifying by controlled water hydrolysis to form interface capable of molding magnetic powder under 180°C. Different atmosphere, from nitrogen and air had been preparing for heat treatment at 700°C and 1100°C respectively.
Spectroscopic techniques from XPS and FTIR have identified chemical exchanges during condensation and pyrolysis. The results from XRD and SEM show the crystallization behavior and the morphology of interface. And the ultimate magnetic properties of the metal-ceramic composites have been measured by SQUID and LCR.
The results suggest an alkylsiloxane network interface could be derived after hydrolysis condensation by PSZ. The coverage networks provide insulator and corrosion resistance layers for NiFe during high temperature but are influenced by the atmosphere. By controlling the atmosphere and heat treatment temperature, it is possible to enhance the magnetic properties of PmPSZ composites. According to the analysis of LCR meter, PmPSZ composites have the maximum permeability within 10~20MHz. After the 700°C/N2 heat treatment process, the maximum value rises up 14%.
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