本文選題：燒結(jié)NdFeB磁體 + 硅烷轉(zhuǎn)化膜　； 參考：《合肥工業(yè)大學(xué)》2017年碩士論文

【摘要】：燒結(jié)NdFeB磁體自問(wèn)世以來(lái),以其優(yōu)異的磁性能而被廣泛應(yīng)用于國(guó)民經(jīng)濟(jì)的各個(gè)領(lǐng)域。但NdFeB磁體的耐蝕性能極差,嚴(yán)重限制了其應(yīng)用領(lǐng)域的進(jìn)一步拓展。因此,需要在燒結(jié)NdFe B磁體表面添加防護(hù)涂層,提高磁體的耐蝕性能。本文采用硅烷化技術(shù)對(duì)NdFeB磁體進(jìn)行表面防護(hù)處理,在磁體表面制備了硅烷轉(zhuǎn)化膜。為磁體表面防護(hù)提供了一種新型環(huán)保的暫時(shí)性防護(hù)措施。采用浸涂法在燒結(jié)NdFeB表面制備了硅烷轉(zhuǎn)化膜,利用鹽霧試驗(yàn)測(cè)試其耐腐蝕性能,進(jìn)而采用正交試驗(yàn)法對(duì)影響硅烷水解、成膜的工藝參數(shù)進(jìn)行了優(yōu)化,結(jié)果表明:硅烷水解的最佳工藝參數(shù)是硅烷偶聯(lián)劑濃度為150 ml/L,醇水比為80:20,水解溫度為30℃,水解時(shí)間為24 h,PH值為11,硅烷成膜的最佳工藝參數(shù)是浸涂時(shí)間為2 min,在80℃下預(yù)烘烤15 min,固化溫度為180℃,固化時(shí)間為1.5 h。采用最佳工藝參數(shù)在磁體表面制備的硅烷轉(zhuǎn)化膜的耐蝕性能較好,但力學(xué)性能較差。為了改善燒結(jié)NdFeB磁體表面硅烷轉(zhuǎn)化膜的力學(xué)性能及耐腐蝕性能,通過(guò)在浸涂溶液中摻雜納米CeO_2顆粒對(duì)硅烷轉(zhuǎn)化膜進(jìn)行了改性處理,制備了CeO_2/硅烷復(fù)合薄膜。采用中性鹽霧試驗(yàn)和動(dòng)電位極化曲線(xiàn)對(duì)涂層的耐蝕性能進(jìn)行了研究,分別采用拉力試驗(yàn)機(jī)和顯微硬度計(jì)對(duì)基體與涂層之間的結(jié)合力及CeO_2/硅烷復(fù)合薄膜的顯微硬度進(jìn)行了測(cè)試。結(jié)果表明:在NdFeB磁體表面涂覆的CeO_2/硅烷復(fù)合薄膜較硅烷轉(zhuǎn)化膜具有更加優(yōu)異的耐腐蝕性能和力學(xué)性能。對(duì)在NdFeB磁體表面制備的硅烷轉(zhuǎn)化膜和CeO_2/硅烷復(fù)合薄膜的腐蝕機(jī)理進(jìn)行了系統(tǒng)探究,并初步建立了相應(yīng)的腐蝕模型。為燒結(jié)NdFeB磁體表面實(shí)現(xiàn)硅烷化防護(hù)處理提供了技術(shù)支持。
[Abstract]:Sintered NdFeB magnets have been widely used in various fields of national economy because of their excellent magnetic properties. However, the corrosion resistance of NdFeB magnets is very poor, which seriously limits the further development of their application fields. Therefore, it is necessary to add protective coating on the surface of sintered NdFeB magnets to improve the corrosion resistance of the magnets. Silane conversion films were prepared on the surface of NdFeB magnets by silanization. It provides a new kind of temporary environmental protection measures for the surface protection of magnets. Silane conversion film was prepared on the surface of sintered NdFeB by immersion coating method. The corrosion resistance of the film was tested by salt spray test, and the process parameters affecting silane hydrolysis and film formation were optimized by orthogonal test. The results show that the optimum technological parameters of silane hydrolysis are the concentration of silane coupling agent 150 ml / L, the ratio of alcohol to water 80: 20, and the hydrolysis temperature 30 鈩，

本文編號(hào)：2098750