本文選題：TiO_2薄膜 + 風(fēng)沙��； 參考：《內(nèi)蒙古工業(yè)大學(xué)》2017年碩士論文

【摘要】：二氧化鈦納米薄膜具有許多獨(dú)特的物理化學(xué)性能,近年來有關(guān)其應(yīng)用于光催化、太陽能和自清潔等領(lǐng)域的研究越來越多,但目前關(guān)于二氧化鈦納米薄膜界面結(jié)構(gòu)及力學(xué)性能的研究很少,而這些力學(xué)特性對其應(yīng)用具有重要的影響。對于涂有二氧化鈦納米薄膜的太陽能電池板和玻璃等材料來說,長期在戶外惡劣環(huán)境下使用,必然會受到風(fēng)沙的沖蝕和磨損,尤其是在內(nèi)蒙古中西部等北方多風(fēng)沙地區(qū),受風(fēng)沙環(huán)境的侵蝕更為嚴(yán)重,必然會縮短二氧化鈦納米薄膜的使用壽命。因此,研究風(fēng)沙環(huán)境下二氧化鈦納米薄膜的沖蝕磨損特性和失效行為,對揭示二氧化鈦納米薄膜受風(fēng)沙侵蝕的作用機(jī)理、評價(jià)其耐久性以及進(jìn)一步改善其性能具有重要的意義。本文通過溶膠-凝膠法,在玻璃表面制備一、三、五層二氧化鈦納米薄膜,研究二氧化鈦薄膜對玻璃基體表面抵抗風(fēng)沙侵蝕的影響。利用傅立葉變換紅外光譜儀(FT-IR)、X射線衍射儀(XRD)等分析測試手段系統(tǒng)的研究熱處理對二氧化鈦薄膜物相組成。結(jié)果表明:二氧化鈦在300°C時,主要以非晶態(tài)的形式存在。隨著溫度提升到500°C,板鈦礦逐漸消失,被新生成的銳鈦礦替代。利用輝光顯微鏡和橢圓偏光測厚儀,對涂覆一、三、五層的TiO_2薄膜厚度進(jìn)行了測定。結(jié)果表明:隨著薄膜層數(shù)的增加,其厚度逐漸的均勻增加。利用氣流挾沙噴射法對涂膜玻璃進(jìn)行沖蝕實(shí)驗(yàn),通過控制風(fēng)沙流速、沙劑量、沖蝕角度等變量,真實(shí)模擬了實(shí)際的風(fēng)沙環(huán)境。采用掃描電鏡(SEM)研究了TiO_2薄膜在風(fēng)沙環(huán)境下的沖蝕磨損特性、沖蝕行為和侵蝕機(jī)理。并通過質(zhì)量失重法,評價(jià)了薄膜材料抗風(fēng)沙沖蝕的特性。結(jié)果顯示:TiO_2薄膜磨損量隨著沖蝕速度和沙劑量的增加而增加;而隨著薄膜厚度的增加,磨損量逐漸減小;其侵蝕機(jī)理為:在低角度沖蝕下,薄膜主要受到微切削作用下產(chǎn)生的劃痕損傷,而在高角度沖蝕下,主要受到?jīng)_蝕擠壓變形作用下產(chǎn)生的材料破損。同時TiO_2薄膜不僅強(qiáng)度高而且脆性強(qiáng),其在高角度沖蝕下的磨損更為嚴(yán)重。利用Fluent軟件模擬風(fēng)沙對涂覆TiO_2薄膜玻璃的沖蝕過程,運(yùn)算得出風(fēng)沙對靶材的侵蝕率,所得數(shù)據(jù)與試驗(yàn)結(jié)果進(jìn)行對比。結(jié)果表明:試驗(yàn)數(shù)據(jù)與模擬數(shù)據(jù)雖有較大誤差,但是整體數(shù)據(jù)趨勢相同,誤差可以接受,為其沖蝕行為可以提供有利的預(yù)測與判斷。
[Abstract]:Titanium dioxide nanocrystalline films have many unique physical and chemical properties. In recent years, there have been more and more researches on their applications in photocatalysis, solar energy and self-cleaning. However, there are few studies on the interface structure and mechanical properties of TIO _ 2 nanocrystalline films, and these mechanical properties have an important impact on its application. For materials such as solar panels and glass coated with titanium dioxide nanocrystalline films, long-term use in harsh outdoor environments will inevitably result in erosion and wear by wind sand, especially in windy and sandy areas in the central and western parts of Inner Mongolia. The erosion caused by wind and sand environment is more serious, which will shorten the service life of TIO _ 2 nanocrystalline film. Therefore, it is of great significance to study the erosion and wear characteristics and failure behavior of TIO _ 2 nanocrystalline films in wind-sand environment, to reveal the mechanism of wind erosion, to evaluate its durability and to further improve its performance. In this paper, one, three and five layers of TIO _ 2 nanocrystalline films were prepared on glass surface by sol-gel method. The effect of TIO _ 2 film on the surface of glass substrate against wind erosion was studied. The phase composition of titanium dioxide thin films was studied by means of Fourier transform infrared spectroscopy (FTIR) and X-ray diffractometer (XRD). The results show that titanium dioxide mainly exists in amorphous form at 300 擄C. As the temperature rises to 500 擄C, the plate titanite disappears and is replaced by the newly formed anatase. The thickness of TiO_2 film coated with one, three and five layers was measured by means of glow microscope and ellipsometer. The results show that the thickness of the films increases uniformly with the increase of the number of layers. The erosion experiment of coated glass was carried out by means of airflow sand carrying spray method. The actual wind-sand environment was simulated by controlling wind sand velocity, sand dose, erosion angle and other variables. The erosion wear characteristics, erosion behavior and erosion mechanism of TiO_2 films in wind-sand environment were studied by SEM. The erosion resistance of thin film materials to wind and sand was evaluated by mass loss method. The results show that the wear amount increases with the increase of erosion velocity and sand dose, but decreases with the increase of film thickness. The film is mainly scratched by micro-cutting, while the material is damaged by erosion and extrusion under high angle erosion. At the same time, the TiO_2 film not only has high strength and brittleness, but also has more serious wear under high angle erosion. The erosion process of TiO_2 thin film glass coated with wind sand was simulated by Fluent software, and the erosion rate of wind sand to target was obtained by calculation. The results were compared with the experimental results. The results show that although there is a large error between the experimental data and the simulated data, the overall data trend is the same and the error is acceptable, which can provide favorable prediction and judgment for the erosion behavior of the test data.
【學(xué)位授予單位】：內(nèi)蒙古工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TQ134.11;TB383.2

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相關(guān)期刊論文 前10條

1 張博;冀國俊;劉全生;史志銘;;風(fēng)沙對玻璃表面TiO_2納米薄膜沖蝕行為研究[J];人工晶體學(xué)報(bào);2016年06期

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本文編號：1891861