本文選題：高溫磁懸浮軸承　切入點：線圈　出處：《南京航空航天大學》2011年碩士論文

【摘要】：本文主要對高溫磁懸浮軸承定子線圈封裝材料及其封裝工藝進行了初步的研究。由于對線圈進行封裝可以顯著提高線圈的高溫絕緣可靠性,提高線圈的使用壽命,提高線圈的綜合性能,通過對玻璃、玻璃/陶瓷復(fù)合材料、高鋁水泥、磷酸鋁無機膠體材料體系的耐高溫性能、高溫絕緣性能、粘結(jié)性能等性能指標測試分析,并設(shè)計了磁懸浮軸承磁極線圈的封裝結(jié)構(gòu)和線圈封裝工藝。最后利用有限元軟件分析了高溫磁懸浮軸承定子線圈封裝體的熱應(yīng)力,探討了降低高溫磁懸浮軸承在工作運行溫度下線圈封裝體熱應(yīng)力的措施。研究結(jié)果表明,無堿玻璃能夠?qū)崿F(xiàn)低溫共燒,具有耐高溫性能及高溫絕緣性能,但存在因燒結(jié)收縮過大引起的封裝體表面嚴重開裂的缺陷;玻璃/陶瓷復(fù)合材料與無堿玻璃相比,雖然降低了燒結(jié)收縮率,減少了封裝表面開裂程度,但依然不能完全解決封裝表面開裂問題;通過摻加3%的耐堿玻璃纖維構(gòu)成的高鋁水泥玻璃纖維復(fù)合材料,大大提高了抗熱沖擊性能與耐開裂性,但存在材料結(jié)構(gòu)致密性不高,較易起“浮層”導(dǎo)致掉渣,同時存在水化結(jié)合硬化周期較長的缺陷;磷酸鋁無機膠體固化過程中發(fā)生縮合聚合反應(yīng)生成三維網(wǎng)絡(luò)無機高分子聚合物,磷酸鋁無機膠體能夠潤濕金屬基體,并且在粘結(jié)界面結(jié)合處形成一層過渡層;Al_2O_3陶瓷的摻加提高了固化后的磷酸鋁無機膠體的高溫絕緣性能,玻璃纖維的摻加提高了材料的抗熱沖擊性能、耐開裂性;磷酸鋁無機膠體具有固化工藝簡單,良好的耐高溫性能、絕緣性能及粘結(jié)性能,基本滿足高溫磁懸浮軸承定子線圈封裝材料的要求。
[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.
【學位授予單位】：南京航空航天大學
【學位級別】：碩士
【學位授予年份】：2011
【分類號】：TH134

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