本文選題：雙層輝光離子滲 + 鈷基合金　； 參考：《稀有金屬》2017年06期

【摘要】：采用雙層輝光滲金屬技術(shù)在Ti6Al4V鈦合金表面制備鈷基合金層以增強(qiáng)其耐磨、抗蝕性能,并考察了進(jìn)行后噴丸復(fù)合以改善高溫處理中對(duì)基材疲勞抗力損傷的處理對(duì)其性能的影響。利用掃描電子顯微鏡(SEM)、X射線衍射儀(XRD)、輝光放電光譜儀、顯微硬度計(jì)、靜態(tài)壓入和動(dòng)態(tài)壓壓疲勞設(shè)備分析和評(píng)價(jià)了鈷基合金滲層的結(jié)構(gòu)、成分分布、硬度和表面韌性,借助球-盤磨損試驗(yàn)機(jī)和電化學(xué)工作站研究了改性層對(duì)基材的干磨損行為和抗3.5%NaCl(質(zhì)量分?jǐn)?shù))水溶液電化學(xué)腐蝕性能的影響。結(jié)果表明:在鈦合金表面制備出由20μm沉積層和約5μm擴(kuò)散層組成的鈷基合金滲層,組成元素呈梯度漸變分布,表面硬度達(dá)HK_(0.98)N718,由于基材表面硬度提高了近一倍并具有良好的減摩潤滑特性,使鈦合金表面耐磨性提高了28倍,同時(shí)該滲層在3.5%NaCl(質(zhì)量分?jǐn)?shù))水溶液中呈現(xiàn)良好的鈍化特性,抗腐蝕性能優(yōu)于鈦合金基材。經(jīng)陶瓷丸以0.15 mm A強(qiáng)度(Almen強(qiáng)度)噴丸后處理的鈷基合金滲層的上表面沉積層減薄了1/5,表面硬度稍有增加,且表層硬度梯度呈現(xiàn)出一定程度的變緩,表面韌性卻明顯增強(qiáng),但噴丸處理不僅使得鈷基滲層表面耐磨性有所降低,其磨損率僅為鈦合金的1/10,而且引起鈷基合金滲層抗電化學(xué)腐蝕性能稍劣于鈦合金基材。
[Abstract]:Co-base alloy layer was prepared on the surface of Ti6Al4V titanium alloy by double-layer glow permeation technique to enhance its wear resistance and corrosion resistance. The effect of post-shot blasting on the fatigue resistance of Ti6Al4V titanium alloy was investigated in order to improve the fatigue resistance of the substrate during high temperature treatment. The structure, composition distribution, hardness and surface toughness of cobalt-based alloying layer were analyzed and evaluated by means of scanning electron microscope (SEM), X-ray diffractometer (XRD), glow discharge spectrometer (GDS), microhardness tester, static indentation and dynamic compressive fatigue equipment. The effects of the modified layer on the dry wear behavior of the substrate and the electrochemical corrosion resistance of 3.5% NaCl-aqueous solution were studied by means of a ball disk wear tester and an electrochemical workstation. The results show that the cobalt-based alloying layer composed of 20 渭 m deposit layer and about 5 渭 m diffusion layer is prepared on the surface of titanium alloy. The surface hardness of the titanium alloy is up to HKD 0.98 N718.The surface hardness of the base material has been increased by nearly twice and has good antifriction and lubrication properties, which has improved the wear resistance of the titanium alloy surface by 28 times, and the layer has a good passivation property in the 3.5 NaCl-water solution. The corrosion resistance is superior to that of titanium alloy substrate. After peening with ceramic pellets with 0.15 mm A strength and Almen strength), the deposit layer on the upper surface of cobalt-based alloy was reduced by 1 / 5, the surface hardness increased slightly, and the hardness gradient of the surface layer decreased to a certain extent, but the surface toughness was obviously enhanced. However, shot peening not only reduced the wear resistance of cobalt-based coating, but also caused a slight deterioration of the electrochemical corrosion resistance of cobalt-based alloy coating than that of titanium alloy substrate, and the wear rate of the coating was only 1 / 10 of that of titanium alloy, and the electrochemical corrosion resistance of the coating was slightly worse than that of titanium alloy substrate.
【作者單位】： 西安建筑科技大學(xué)冶金工程學(xué)院;西北工業(yè)大學(xué)腐蝕與防護(hù)研究所;
【基金】：陜西省教育廳專項(xiàng)科研計(jì)劃項(xiàng)目(2013JK0916) 國家自然科學(xué)基金項(xiàng)目(51171154)資助
【分類號(hào)】：TG174.4

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