高温磁悬浮轴承定子线圈封装材料与工艺研究

发布时间：2018-04-08 15:38

本文选题：高温磁悬浮轴承　切入点：线圈　出处：《南京航空航天大学》2011年硕士论文

【摘要】：本文主要对高温磁悬浮轴承定子线圈封装材料及其封装工艺进行了初步的研究。由于对线圈进行封装可以显著提高线圈的高温绝缘可靠性,提高线圈的使用寿命,提高线圈的综合性能,通过对玻璃、玻璃/陶瓷复合材料、高铝水泥、磷酸铝无机胶体材料体系的耐高温性能、高温绝缘性能、粘结性能等性能指标测试分析,并设计了磁悬浮轴承磁极线圈的封装结构和线圈封装工艺。最后利用有限元软件分析了高温磁悬浮轴承定子线圈封装体的热应力,探讨了降低高温磁悬浮轴承在工作运行温度下线圈封装体热应力的措施。研究结果表明,无碱玻璃能够实现低温共烧,具有耐高温性能及高温绝缘性能,但存在因烧结收缩过大引起的封装体表面严重开裂的缺陷;玻璃/陶瓷复合材料与无碱玻璃相比,虽然降低了烧结收缩率,减少了封装表面开裂程度,但依然不能完全解决封装表面开裂问题;通过掺加3%的耐碱玻璃纤维构成的高铝水泥玻璃纤维复合材料,大大提高了抗热冲击性能与耐开裂性,但存在材料结构致密性不高,较易起“浮层”导致掉渣,同时存在水化结合硬化周期较长的缺陷;磷酸铝无机胶体固化过程中发生缩合聚合反应生成三维网络无机高分子聚合物,磷酸铝无机胶体能够润湿金属基体,并且在粘结界面结合处形成一层过渡层;Al_2O_3陶瓷的掺加提高了固化后的磷酸铝无机胶体的高温绝缘性能,玻璃纤维的掺加提高了材料的抗热冲击性能、耐开裂性;磷酸铝无机胶体具有固化工艺简单,良好的耐高温性能、绝缘性能及粘结性能,基本满足高温磁悬浮轴承定子线圈封装材料的要求。
[Abstract]:In this paper, the packaging materials and packaging technology of high temperature magnetic bearing stator coil are studied.As the coil packaging can significantly improve the high temperature insulation reliability of the coil, improve the service life of the coil, improve the comprehensive properties of the coil, through glass, glass / ceramic composites, high aluminum cement,The properties of aluminum phosphate inorganic colloidal material system, such as high temperature resistance, high temperature insulation, adhesive property, etc., were tested and analyzed. The encapsulation structure of magnetic pole coil of magnetic suspension bearing and the encapsulation process of the coil were designed.Finally, the thermal stress of the stator coil package of high temperature maglev bearing is analyzed by the finite element software, and the measures to reduce the thermal stress of the coil package at the operating temperature of the high temperature magnetic suspension bearing are discussed.The results show that the alkali-free glass can be co-fired at low temperature and has high temperature resistance and high temperature insulation, but there is a serious crack on the surface of the package due to excessive sintering shrinkage.Compared with alkali free glass, glass / ceramic composites can not completely solve the problem of packaging surface cracking, although it can reduce the sintering shrinkage and reduce the crack degree of packaging surface.The thermal shock resistance and cracking resistance of high aluminum cement glass fiber composites are greatly improved by adding 3% alkali resistant glass fiber, but the structure density of the material is not high, and it is easy to cause slag drop by "floating layer".At the same time, the hydration bond hardening period is long, the condensation polymerization reaction takes place in the process of solidification of aluminum phosphate inorganic colloid to form three-dimensional network inorganic polymer, the inorganic colloid of aluminum phosphate can wetting the metal matrix,The addition of Al2O3 ceramics at the bonding interface improves the high temperature insulation properties of the solidified aluminum phosphate inorganic colloid, and the glass fiber admixture improves the thermal shock resistance and cracking resistance of the materials.Aluminum phosphate inorganic colloid has the advantages of simple curing process, good high temperature resistance, insulation and adhesive properties, which basically meet the requirements of high temperature magnetic bearing stator coil packaging material.
【学位授予单位】：南京航空航天大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH134

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