本文關(guān)鍵詞： 激光技術(shù) 超疏水 微納結(jié)構(gòu) 鋁板表面 納秒激光　出處：《湖北工業(yè)大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：超疏水表面的廣闊應(yīng)用前景使其成為近幾年來研究熱點(diǎn)。金屬及其合金表面由于自身所具有的較高表面自由能使得在自然條件下很難獲得超疏水金屬表面�，F(xiàn)有超疏水金屬表面的制備方法多是基于提高材料表面粗糙度和降低材料表面能提出的兩步法。本文采用納秒脈沖激光器結(jié)合后期干燥箱的保溫處理,可快速獲得超疏水鋁板表面,研究?jī)?nèi)容如下:使用脈寬為240ns的納秒脈沖激光器掃描加工鋁板表面,在光斑直徑為50μm、搭接率為69%、掃描間隔為14.75μm時(shí),選取不同能量密度加工后的鋁板表面,在100℃干燥箱中保溫處理12h后得粘附性較低的超疏水鋁表面,接觸角最高可達(dá)166.1°同時(shí)滾動(dòng)角為7.2°。隨激光能量密度的增加,表面粗糙度在急劇上升后達(dá)到平穩(wěn)狀態(tài),當(dāng)激光能量密度大于25J/cm~2時(shí),鋁板表面存在明顯的微納復(fù)合結(jié)構(gòu),水滴與超疏水表面的混合接觸中,存在著90%以上的面積是與空氣接觸;對(duì)超疏水鋁板表面的元素分析中均發(fā)現(xiàn)了一定含量的碳元素存在,認(rèn)為鋁板表面浸潤(rùn)性的改變是材料表面形貌和化學(xué)成分共同作用的結(jié)果。選取六組不同脈寬的波形在相同加工參數(shù)下得到不同粗糙程度的鋁板表面,結(jié)合溫度、濕度和時(shí)間三個(gè)后處理因素,對(duì)激光加工后的鋁板表面浸潤(rùn)性變化展開分析。認(rèn)為溫度是影響樣品表面與水滴接觸角的主要因素,不同溫度后處理下所需要的時(shí)間不同,同時(shí)激光參數(shù)也對(duì)這一轉(zhuǎn)變有著一定的影響;在一定溫度條件下,濕度對(duì)激光加工后的鋁板表面在水下與油的接觸角有顯著影響,通過對(duì)溫度和濕度的控制可得到不同潤(rùn)濕性能的表面。在溫度為80℃、相對(duì)濕度為90%條件下存儲(chǔ)4小時(shí)后可成功獲得疏水親油表面。本文運(yùn)用納秒光纖激光器對(duì)鋁板表面潤(rùn)濕性機(jī)制進(jìn)行研究,分析表面粗糙度及微觀組織結(jié)構(gòu)對(duì)鋁板表面潤(rùn)濕性的影響規(guī)律,以期獲得較好的超疏水表面結(jié)構(gòu)。同時(shí)通過對(duì)后處理中溫濕度和時(shí)間等因素的控制,對(duì)激光加工后鋁板表面微納復(fù)合結(jié)構(gòu)的潤(rùn)濕性展開研究。
[Abstract]:The wide application prospect of superhydrophobic surface makes it a hot research topic in recent years. The surface of metal and its alloy is difficult to obtain under natural conditions due to its high surface free energy. The preparation methods of superhydrophobic metal surface are mostly based on the two-step method proposed to improve the surface roughness and reduce the surface energy of the material. In this paper, the nanosecond pulse laser combined with the thermal insulation of the later drying box is used. The surface of superhydrophobic aluminum plate can be obtained quickly. The research contents are as follows: when the spot diameter is 50 渭 m, the lap ratio is 69 and the scanning interval is 14.75 渭 m, the nanosecond pulse laser with pulse width of 240 ns is used to scan the aluminum plate surface. The surface of aluminum plate with different energy density was selected. The surface of super hydrophobic aluminum with low adhesion was obtained after heat preservation in 100 鈩，

本文編號(hào)：1548282