本文選題：Al基準晶 + 研磨　； 參考：《大連理工大學》2017年博士論文

【摘要】：準晶材料因其特殊的結(jié)構(gòu)而具有低摩擦系數(shù)、低表面能、不粘性、高硬彈比以及高化學和熱穩(wěn)定等特性,在摩擦磨損領(lǐng)域有重要應用價值。本文選用典型的Al_(62.0)Cu_(25.5)Fe_(12.5)二十面體準晶作為磨料,與傳統(tǒng)硬質(zhì)磨料如金剛石、Al_2O_3和SiO_2等進行對比,研究其在研磨金屬如鋁、銅合金和不銹鋼時的摩擦磨損行為,尤其關(guān)注準晶獨特的碾磨機制,即以極少的表面去除率達到表面平整化,同時揭示了準晶碾磨所帶來的特有的不銹鋼表面鈍化增強效應。本論文的主要研究內(nèi)容和結(jié)論包括如下幾點:(1)針對準晶磨料特殊的摩擦磨損方式,建立了相關(guān)幾何模型,定量描述了準晶磨料對軟金屬的碾磨主導機制。定義了表征磨損機制的"碾磨系數(shù)",表達為表面壓痕尺寸變化和表面去除深度的比值△R/△h,碾磨系數(shù)越高,說明碾磨作用越占主導地位,反之,則說明切削作用占主導地位。Al_(62.0)Cu_(25.5)Fe_(12.5)二十面體準晶磨料在拋光2024鋁合金、T2紫銅、QSn6.5-0.1錫青銅和304不銹鋼時始終表現(xiàn)高的碾磨系數(shù),說明了準晶磨料具有突出碾磨作用。(2)準晶磨料的碾磨特性導致金屬表面產(chǎn)生強烈硬化效應。Al_(62.0)Cu_(25.5)Fe_(12.5)準晶磨料處理不銹鋼表面后,硬度比傳統(tǒng)磨料處理的高0.25～0.40GPa,處理紫銅表面,其硬度比傳統(tǒng)磨料處理的高0.12～0.21GPa。碾磨機制與傳統(tǒng)切削機制比較,準晶磨料在保證加工表面平整性的同時,有效避免表面產(chǎn)生嚴重的劃傷,最大程度的保證加工工件尺寸,符合軟金屬材料表面拋光的需要。(3)基于準晶磨料特殊的碾磨機制,提出一種區(qū)別傳統(tǒng)磨料的不銹鋼表面預處理方法,可明顯提高不銹鋼鈍化特性和耐蝕性能。利用準晶磨料在平整化金屬表面的同時,亦積累大量的塑性變形,增加鈍化元素擴散系數(shù)形成完整致密的鈍化膜,從而有效提高不銹鋼耐蝕性能。利用3種傳統(tǒng)磨料和準晶磨料預處理304不銹鋼樣品,進行酸洗鈍化處理。在3.5%NaCl中性溶液浸泡不同時間,阻抗EIS測試結(jié)果表明,Al_(62.0)Cu_(25.5)Fe_(12.5)準晶磨料處理的不銹鋼樣品表面阻抗隨浸泡時間增加而顯著增大。根據(jù)等效電路模擬結(jié)果,不銹鋼內(nèi)層鈍化膜阻抗值在浸泡96 h時達到最大為21.5×105Ω cm~2,比傳統(tǒng)磨料預處理的樣品高一個數(shù)量級。Mott-Schottky結(jié)果表明,準晶磨料處理的不銹鋼工件的載流子濃度最低,與傳統(tǒng)磨料相比,準晶磨料處理的工件表面生成的鈍化膜更加完整致密。極化曲線結(jié)果表明,隨著浸泡時間的增加,準晶磨料拋光的不銹鋼表面鈍化膜的耐點蝕能力提高。(4)在KOH+NaOH+3.5%NaCl的堿性溶液中,Al_(62.0)Cu_(25.5)Fe_(12.5)準晶磨料處理的不銹鋼表面的內(nèi)層鈍化膜阻抗最大為18.543×105Ωcm~2,內(nèi)層鈍化膜的導納Y2最小,總阻抗值最大。Mott-Schottky結(jié)果表明準晶處理的表面鈍化膜缺陷最少,在堿性溶液中能夠快速地生成比較完整的鈍化膜。循環(huán)極化曲線結(jié)果表明,準晶磨料處理的不銹鋼在堿性溶液中能快迅鈍化,生成具有較強抗點蝕能力和自我修復能力的鈍化膜。上述結(jié)果為準晶材料開辟了全新的磨料應用領(lǐng)域,有望形成兼具表面平整化和增強鈍化效果的表面處理新方法。
[Abstract]:The quasicrystal material has the characteristics of low friction coefficient, low surface energy, viscosity, high hard elastic ratio, high chemical and thermal stability, because of its special structure. It has important application value in the field of friction and wear. In this paper, the typical Al_ (62) Cu_ (25.5) Fe_ (12.5) twenty surface quasicrystals are used as abrasive and the traditional hard abrasive, such as diamond, Al_2O_3 and SiO, is used. The friction and wear behavior of _2 in grinding metal such as aluminum, copper alloy and stainless steel is studied, especially the unique grinding mechanism of quasicrystals, that is, the surface leveling is achieved with very little surface removal rate. At the same time, the enhancement effect of the specific stainless steel surface passivation caused by the quasicrystal grinding is revealed. The main research content of this paper is the main research content of this paper. And the conclusions are as follows: (1) in view of the special friction and wear mode of the quasicrystal abrasive, a correlative geometric model is established, and the leading mechanism of the grinding of the soft metal is described. The "grinding coefficient" which characterizing the wear mechanism is defined, which is expressed as the ratio of the surface indentation size to the surface removal depth and the ratio of the grinding coefficient, the more the grinding coefficient is, the more the grinding coefficient is obtained. It shows that the grinding effect is the dominant position, and on the contrary, it shows that the cutting action dominated.Al_ (62) Cu_ (25.5) Fe_ (12.5) twenty face quasicrystal abrasive in polishing 2024 aluminum alloy, T2 copper, QSn6.5-0.1 tin bronze and 304 stainless steel. It shows that the quasicrystal abrasive has a prominent grinding effect. (2) quasicrystal abrasive. .Al_ (62) Cu_ (25.5) Fe_ (12.5) pericrystal abrasive has a strong hardening effect on the surface of the stainless steel. The hardness is 0.25 ~ 0.40GPa higher than that of the traditional abrasive. The hardness of the copper surface is compared with the traditional grinding mechanism of the traditional abrasive treatment, which is 0.12 to 0.21GPa., and the quasicrystal abrasive is guaranteed. At the same time, it can effectively avoid serious scratches on the surface and ensure the size of the workpiece to the maximum. (3) based on the special grinding mechanism of the quasicrystal abrasive, a stainless steel surface pretreatment method which distinguishes the traditional abrasive is proposed, which can obviously improve the passivation of stainless steel. When the quasicrystal abrasive is used to smooth the surface of the metal, a large amount of plastic deformation is accumulated while the diffusivity of the passivation element is increased to form a complete and compact passivation film, thus effectively improving the corrosion resistance of stainless steel. 3 kinds of traditional abrasives and quasicrystal abrasives are used to pretreat 304 stainless steel samples to be treated by pickling and passivation. In 3.5 %NaCl neutral solution was soaked for different time. The impedance EIS test results showed that the surface impedance of the stainless steel samples treated with Al_ (62) Cu_ (25.5) Fe_ (12.5) increased significantly with the soaking time. According to the equivalent circuit simulation results, the impedance value of the passivation film in the stainless steel inner layer reached to the maximum of 21.5 x 105 Omega cm~2 when soaking 96 h. The results of a high order of magnitude.Mott-Schottky of the sample prepared by the abrasive pretreatment showed that the carrier concentration of the stainless steel workpiece treated by the quasicrystal was the lowest. Compared with the traditional abrasive, the passivation film formed on the surface of the quasicrystal abrasive was more complete and compact. The polarization curves showed that the polishing of the quasicrystal abrasive was not good as the soaking time increased. Corrosion resistance of the passivation film on the surface of rust steel is improved. (4) in the alkaline solution of KOH+NaOH+3.5%NaCl, the internal passivation film impedance of the stainless steel surface treated by Al_ (62) Cu_ (25.5) Fe_ (12.5) is 18.543 x 105 Omega cm~2, the admittance Y2 of the inner passivation film is the smallest, and the maximum impedance value.Mott-Schottky results show the table of quasicrystal treatment. The surface passivation film has the least defects, which can quickly produce a relatively complete passivation film in the alkaline solution. The cyclic polarization curve shows that the stainless steel treated by the quasicrystal can quickly passivate in the alkaline solution and produce a passivating film with strong resistance to pitting and self repair. The above results have opened a new grinding for the quasicrystal material. In the field of material application, it is expected to form a new surface treatment method with surface smoothness and enhanced passivation effect.
【學位授予單位】：大連理工大學
【學位級別】：博士
【學位授予年份】：2017
【分類號】：TG73

【參考文獻】

相關(guān)期刊論文 前8條

1 陳千寶;王雁斌;羌建兵;陳華;王英敏;王清;董闖;;Al_(62)Cu_(25.5)Fe_(12.5)準晶磨料的制備及性能[J];中國有色金屬學報;2013年05期

2 Suyitno;Budi Arifvianto;Teguh Dwi Widodo;Muslim Mahardika;Punto Dewo;Urip Agus Salim;;Effect of cold working and sandblasting on the microhardness, tensile strength and corrosion resistance of AISI 316L stainless steel[J];International Journal of Minerals Metallurgy and Materials;2012年12期

3 朱俊;;中國不銹鋼管材的應用與市場前景[J];金屬世界;2011年01期

4 王海飛;王國紅;崔榮星;;TiN膜層提高2Cr13不銹鋼葉片的抗沖刷腐蝕性能[J];石油機械;2009年10期

5 Esmaeil Jafari;Mohammad Jafar Hadianfard;;Influence of Surface Treatment on the Corrosion Resistance of Stainless Steel in Simulated Human Body Environment[J];Journal of Materials Science & Technology;2009年05期

6 方亮,杜道山,張曉峰,劉維民,薛群基;三體磨損中的塑性變形磨損[J];西安交通大學學報;2003年02期

7 梁磊,周國定,解群,姚秀平,吳一平;不銹鋼管在我國凝汽器上的應用前景[J];中國電力;1998年11期

8 梁成浩，高彥靜，，史維東;離子鍍TiN膜對不銹鋼在海水中縫隙腐蝕行為的影響[J];腐蝕科學與防護技術(shù);1995年02期

相關(guān)碩士學位論文 前3條

1 王寶林;Al-Pd-M(M=Mn,Fe,Cr,Mg)二十面體準晶的電化學脫合金化研究[D];大連理工大學;2014年

2 陳千寶;Al-Cu-Co準晶磨料及其研磨特性研究[D];大連理工大學;2013年

3 王雁斌;Al-Cu-Fe準晶磨料的制備及其性能研究[D];大連理工大學;2012年

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