發(fā)布時間：2018-02-24 13:00

  本文關(guān)鍵詞： BNNTs BNNAs 電化學腐蝕 多孔不銹鋼板 球磨退火法　出處：《哈爾濱工業(yè)大學》2015年碩士論文　論文類型：學位論文

【摘要】：隨著納米材料研究的不斷深入,氮化硼納米管(Boron Nitride Nanotubes,BNNTs)以其獨特的性質(zhì)而受到國內(nèi)外研究人員的廣泛關(guān)注。BNNTs作為一種寬禁帶半導體,具有不受原子結(jié)構(gòu)影響的穩(wěn)定電學性質(zhì),此外,BNNTs還具有穩(wěn)定的化學性質(zhì)、抗氧化性、熱穩(wěn)定性、高熱導率、良好的機械強度等,BNNTs的這些優(yōu)良特性,使其在微納器件、復合材料、氣體存儲等方面展露出廣闊的應用前景。但目前BNNTs的制備方法大都存在著條件苛刻、設(shè)備要求度高、產(chǎn)物產(chǎn)量低、純度低等問題,而且制備出的納米管往往分布雜亂、取向不一,這極大程度上阻礙了納米管的性質(zhì)研究和應用探索。因此,本文前期探索BNNTs的有效制備,再以此為依據(jù),探索取向一致的納米管陣列的有效制備方法。本論文對目前國內(nèi)外關(guān)于BNNTs和定向取向納米管組成的BNNAs(Boron Nitride Nanotube Arrays,BNNAs)的研究進展進行了詳細的綜述,并提出了以多孔不銹鋼板為模板輔助球磨退火法制備BNNAs的實驗方案。依據(jù)實驗方案,第一階段探索球磨退火法制備BNNTs的工藝條件,選用無定形硼粉、九水硝酸鐵、氮氫混合氣為原料,以314奧氏體不銹鋼板為模板退火后,獲得大塊的白色粉體材料,經(jīng)表征產(chǎn)物是結(jié)晶度較高的竹節(jié)狀BNNTs,納米管的管長范圍約為2~8μm,管徑范圍約為75~100 nm。第二階段,利用電化學腐蝕制備BNNAs生長所需的多孔不銹鋼板基板,并分析直流電壓大小、電解液濃度、腐蝕時間等實驗參數(shù)對腐蝕結(jié)果的影響。根據(jù)實驗結(jié)果,發(fā)現(xiàn)隨著直流電壓或電解液濃度的增加,不銹鋼板表面的孔徑逐漸增大,孔洞逐漸加深,但電壓過大或濃度過高時,孔洞逐漸被溶解,規(guī)則的孔狀結(jié)構(gòu)被破壞。同時,隨著電化學腐蝕反應時間的延長,孔的深度不斷加深,但當腐蝕時間過長時,孔狀結(jié)構(gòu)同樣發(fā)生被溶解的狀況。結(jié)合前兩個階段實驗結(jié)論,采用多孔不銹鋼板輔助的球磨退火法制備BNNAs,與第一階段制備BNNTs的原料配比相同,球磨18 h后,加入乙醇制備硼涂料,涂覆于多孔不銹鋼板上放在氮氫混合氣、1150℃的條件下進行退火反應,最終在多孔不銹鋼板上發(fā)現(xiàn)有白色薄膜狀物質(zhì)生成。對產(chǎn)物進行表征分析,發(fā)現(xiàn)獲得的產(chǎn)物是取向一致、分布密度較高的BNNAs,經(jīng)進一步的表征,觀察到構(gòu)成陣列的納米管是結(jié)晶度較高的竹節(jié)狀BNNTs。
[Abstract]:With the development of nanomaterials, Boron Nitride NanobesbesBNNTs (Boron Nitride NanobesbesBNNTs) has been widely concerned by researchers at home and abroad for its unique properties. As a wide band gap semiconductor, BNNTs have stable electrical properties which are not affected by atomic structure. In addition, BNNTs also have stable chemical properties, oxidation resistance, thermal stability, high thermal conductivity, good mechanical strength, and so on. However, there are many problems in the preparation of BNNTs, such as harsh conditions, high equipment requirements, low product yield and low purity. Different orientations greatly hinder the study of the properties and application of nanotubes. Therefore, in this paper, the effective preparation of BNNTs is explored, and based on it, In this paper, the research progress of BNNTs and BNNAs(Boron Nitride Nanotube Arrays-BNNAss, which are composed of BNNAs(Boron Nitride Nanotube, are reviewed in detail. The experimental scheme of preparing BNNAs by using porous stainless steel plate as template was put forward. According to the experimental scheme, the technological conditions of preparing BNNTs by ball milling annealing method were explored in the first stage, the amorphous boron powder and ferric nitrate nine water were selected. After annealing with 314 austenitic stainless steel sheet as template, bulk white powder materials were obtained from nitrogen-hydrogen mixture. The product was bamboo-shaped BNNTs with high crystallinity. The length of nanotubes was about 2 ~ 8 渭 m, and the diameter of nanotubes was about 75 ~ 100 nm. The porous stainless steel plate substrate for the growth of BNNAs was prepared by electrochemical etching. The effects of DC voltage, electrolyte concentration and corrosion time on the corrosion results were analyzed. It is found that with the increase of DC voltage or electrolyte concentration, the pore diameter on the surface of stainless steel plate increases and the hole deepens gradually. However, when the voltage is too high or the concentration is too high, the pore is gradually dissolved and the regular pore structure is destroyed. With the prolongation of electrochemical corrosion reaction time, the depth of the pore deepens, but when the corrosion time is too long, the pore structure also dissolves. The boron coating was prepared by ball milling annealing method assisted by porous stainless steel plate, which was the same as the raw material ratio of the first stage preparation of BNNTs. After 18 h ball milling, the boron coating was prepared by adding ethanol. After annealing reaction at 1150 鈩，

本文編號：1530317