本文選題：鋁合金　切入點(diǎn)：微弧氧化　出處：《大連海事大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

【摘要】：鋁合金在船舶柴油機(jī)活塞上的應(yīng)用具有重要意義,然而其表面硬度、耐磨性、耐腐蝕性等性能上的缺陷制約了鋁合金活塞的廣泛應(yīng)用。因此,需要對(duì)其進(jìn)行表面強(qiáng)化處理。微弧氧化技術(shù)可以在鋁合金表面制備一層具有高硬度、耐磨、耐腐蝕等性能的陶瓷層。在電解液中添加蛇紋石自修復(fù)微納米顆粒后,可以得到一層具有自修復(fù)性能的耐磨陶瓷層。本文利用正交試驗(yàn)法設(shè)計(jì)了電解液參數(shù)和電源參數(shù)的優(yōu)化方案,使用掃描電鏡探究了膜層的表面形貌、截面形貌及元素組成,測(cè)量了膜層厚度、粗糙度、顯微硬度,進(jìn)行了摩擦磨損試驗(yàn),確定了制備陶瓷層的最佳工藝參數(shù);使用高能球磨法制備了蛇紋石微納米顆粒,將蛇紋石粉體添加到電解液中進(jìn)行微弧氧化試驗(yàn),以得到含有蛇紋石微納米顆粒的復(fù)合陶瓷層,并對(duì)添加蛇紋石的濃度進(jìn)行了優(yōu)化;對(duì)試件進(jìn)行摩擦磨損試驗(yàn),并對(duì)試驗(yàn)前后膜層的表面形貌和元素組成進(jìn)行分析,來(lái)研究膜層的自修復(fù)性能。通過(guò)設(shè)計(jì)正交試驗(yàn)對(duì)微弧氧化過(guò)程中的電解液參數(shù)、電源參數(shù)進(jìn)行優(yōu)化。綜合陶瓷膜的膜厚、硬度、粗糙度、以及表面形貌、截面形貌等指標(biāo),對(duì)電解液參數(shù)、電源參數(shù)進(jìn)行優(yōu)化。所得電解液參數(shù)為:硅酸鈉濃度為8g/L、氫氧化鉀濃度為2.5g/L、鎢酸鈉濃度為5g/L、EDTA2g/L;電源參數(shù)為:正向電壓為420V、負(fù)向電壓為130V、占空比為20%、頻率為500Hz、氧化時(shí)間為1h。按照得到的最優(yōu)工藝參數(shù)制備復(fù)合陶瓷層,當(dāng)蛇紋石濃度為6g/L時(shí),陶瓷層性能最優(yōu)。貧油狀態(tài)下,在摩擦磨損試驗(yàn)中與陶瓷膜對(duì)磨,復(fù)合陶瓷膜中Si元素的含量升高,摩擦表面生成一層保護(hù)膜,制備的復(fù)合陶瓷膜具有較好自修復(fù)性。
[Abstract]:The application of aluminum alloy in the piston of marine diesel engine is of great significance. However, the defects of surface hardness, wear resistance and corrosion resistance restrict the wide application of aluminum alloy piston. It is necessary to strengthen the surface of aluminum alloy by micro-arc oxidation. A ceramic layer with high hardness, wear resistance and corrosion resistance can be prepared on the surface of aluminum alloy. A wear-resistant ceramic layer with self-repairing properties can be obtained. In this paper, the optimization scheme of electrolyte parameters and power supply parameters is designed by orthogonal test, and the surface morphology, cross-section morphology and element composition of the film are investigated by SEM. The thickness, roughness and microhardness of the coating were measured, and the friction and wear tests were carried out to determine the optimum technological parameters for the preparation of the ceramic coating, and the serpentine microparticles were prepared by high-energy ball milling. By adding serpentine powder into electrolyte for micro-arc oxidation test, the composite ceramic layer containing serpentine microparticles was obtained, and the concentration of serpentine was optimized. The surface morphology and element composition of the film before and after the experiment were analyzed to study the self-repairing performance of the film. The electrolyte parameters and power supply parameters in the process of micro-arc oxidation were optimized by orthogonal design. Hardness, roughness, surface morphology, cross-section morphology, etc., for electrolyte parameters, The parameters of the electrolyte are as follows: sodium silicate 8 g / L, potassium hydroxide 2.5 g / L, sodium tungstate 5 g / L EDTA 2 g / L, and forward voltage 420 V, negative voltage 130 V, duty cycle 20 g / L, frequency 500 Hz, when oxidized, the power supply parameters are as follows: sodium silicate 8 g / L, potassium hydroxide 2.5 g / L, sodium tungstate 5 g / L EDTA 2 g / L, forward voltage 420 V, negative voltage 130 V, duty cycle 20 g / L, frequency 500 Hz. The composite ceramic layer was prepared according to the optimum process parameters. When the concentration of serpentine is 6 g / L, the performance of ceramic layer is optimal. In the condition of lean oil, the content of Si in the composite ceramic film increases with the friction and wear test, and a protective film is formed on the friction surface. The prepared composite ceramic film has good self-repairing property.
【學(xué)位授予單位】：大連海事大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：U664.121

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