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  本文關(guān)鍵詞： 噴射電沉積 電場 封孔 多層鎳 微觀結(jié)構(gòu)　出處：《南京航空航天大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

【摘要】：作為新能源材料燒結(jié)釹鐵硼磁體以其優(yōu)異的磁性能,普遍應(yīng)用于風(fēng)電、航空、醫(yī)療、工業(yè)等領(lǐng)域。然而材料本身易腐蝕失效給各行業(yè)帶來了巨大損失,因此在基底表面制備膜層來提高自身性能成為重要途徑。噴射電沉積具有高效、穩(wěn)定、可控沉積、晶粒小、操作簡單、成本低等優(yōu)勢,通過合理控制各工藝參數(shù)(電流密度、掃描速度、PH、流量、溫度),可制備出不同結(jié)構(gòu)性能的膜層。本文結(jié)合3D打印技術(shù),在噴射電沉積裝置平臺上,對材料本身和膜層性能方面開展了試驗(yàn)研究。研究的主要內(nèi)容如下:(1)設(shè)計并搭建了自動化噴射電沉積裝置。完成了自動控制系統(tǒng)、傳動系統(tǒng)、液流循環(huán)系統(tǒng)、恒溫加熱系統(tǒng)和核心零部件設(shè)計,解決了以往電沉積手動控制精度低、電鍍液交叉污染等問題,精確控制了噴射流量和電解液溫度范圍,實(shí)現(xiàn)穩(wěn)定可控、且能自動制備厚度均勻且不同結(jié)構(gòu)性能的沉積層。(2)燒結(jié)釹鐵硼腐蝕機(jī)理分析。試驗(yàn)過程無法確認(rèn)釹鐵硼沉積層出現(xiàn)的銹跡、起皮、脫落現(xiàn)象,是由基底各相電位差異引起的。提出在硅表面噴射電沉積試驗(yàn)方案,發(fā)現(xiàn)電位不一硅表面沉積層出現(xiàn)不同程度的電解腐蝕,電位一致硅表面沉積層沒有電解腐蝕,驗(yàn)證了基底各相電位不一確實(shí)造成了釹鐵硼腐蝕失效。(3)燒結(jié)釹鐵硼鎳沉積層封孔工藝研究。研究表明:采用硬脂酸鋅封孔工藝制備鎳層平整性好、平均粒徑和表面粗糙度值達(dá)到最小值12.4nm、0.241μm、在較大的膜基結(jié)合力下,有著很強(qiáng)的耐腐蝕性能,可在標(biāo)準(zhǔn)氯化鈉溶液中抗鹽霧100h。(4)對燒結(jié)釹鐵硼多層鎳進(jìn)行試驗(yàn)研究。發(fā)現(xiàn)相同厚度多層鎳性能優(yōu)于單層鎳。并探究了不同子層厚度對鎳沉積層表面形貌、XRD表征、顯微硬度、結(jié)合力、耐腐蝕之間的影響關(guān)系,對整個鎳層結(jié)構(gòu)進(jìn)行了優(yōu)化。
[Abstract]:As a new energy material sintered NdFeB magnets with excellent magnetic properties, widely used in wind power, aerospace, medical, industrial and other fields. However, the material itself is easy to corrosion to the industry brought huge losses, thus preparing the film on the substrate surface to improve its performance as an important way. With jet electrodeposition efficient, stable, controllable deposition, small grain, simple operation, low cost advantage, by controlling the process parameters (current density, scanning speed, PH, flow rate, temperature), can be prepared by coating different structural performance. This paper combines the 3D printing technology, in jet electrodeposition device on the platform of material the film itself and the performance test was conducted. The main contents are as follows: (1) design and build automation jet electrodeposition device. The completion of the automatic control system, transmission system, liquid circulation system, heating system and The core parts of the design, solves the electrodeposition of manual control precision is low, the plating liquid cross contamination and other issues, the precise control of injection flow and electrolyte temperature range, to achieve stable and controllable, and can automatically prepare the sediment thickness uniformity and different structural properties. (2) analysis of sintered NdFeB test process of corrosion mechanism. Unable to confirm the rust, neodymium iron boron deposits occur the skin off phenomenon, is caused by the potential difference between the base of each phase. Put on the surface of the silicon jet electrodeposition experiment scheme, found a potential surface of silicon deposition layer appeared different degree of electrolytic corrosion, no electrolytic corrosion deposition potential uniform silicon surface layer, verification the base of each phase voltage is not a really caused the failure of NdFeB corrosion. (3) research on sealing hole technology of sintered neodymium iron boron nickel deposition. The results show that: the preparation of nickel layer with good leveling property of zinc stearate sealing process, the average The particle size and the surface roughness value reaches the minimum value of 12.4nm, 0.241 m, in the film substrate larger force, have a strong corrosion resistance, resistance to salt fog in the standard 100h. of Sodium Chloride Solution (4) on the experiment of sintered NdFeB multilayer nickel. The same thickness of multilayer nickel can be found better than that of single nickel. And explore the different sub layer thickness on the nickel layer surface morphology, XRD characterization, microhardness, adhesion, corrosion resistant effect of the relationship between the nickel layer structure was optimized.

【學(xué)位授予單位】：南京航空航天大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TQ153.12

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本文編號：1462811