本文選題：熱障涂層 + 金屬粘結(jié)層��； 參考：《江蘇大學(xué)》2017年碩士論文

【摘要】：燃?xì)鉁u輪發(fā)動(dòng)機(jī)是體現(xiàn)國家核心競爭力的重要標(biāo)志,渦輪進(jìn)口溫度是先進(jìn)燃?xì)鉁u輪發(fā)動(dòng)機(jī)的一大特征,國際上公認(rèn)熱障涂層是顯著提高發(fā)動(dòng)機(jī)服役溫度最切實(shí)可行的辦法。金屬粘結(jié)層在極高服役溫度下的抗氧化腐蝕能力,尤其是其抗熱腐蝕性(即含鹽條件下的熱氧化)直接關(guān)系到熱障涂層的使用壽命。本文圍繞“熱障涂層抗超高溫氧化腐蝕金屬粘結(jié)層”這一研究主題,以具有較好抗高溫?zé)岣g性能且極易形成在超過1000℃以上仍具有良好穩(wěn)定性氧化鋁膜的鋁硅涂層為對象,研究了其在1050℃、1150℃、1250℃混合硫酸鹽中熱腐蝕后的微觀形貌、熱腐蝕動(dòng)力學(xué)、腐蝕產(chǎn)物等熱腐蝕行為,并初步探討了鋁硅涂層在超高溫環(huán)境下的熱腐蝕機(jī)理;同時(shí),考察了預(yù)氧化處理對改善鋁硅涂層抗超高溫?zé)岣g性能的效果;從而為新型抗超高溫氧化腐蝕金屬粘結(jié)層的研制提供一定的理論基礎(chǔ)和技術(shù)支持。所開展的研究工作和取得的成果如下:(1)研究了鋁硅涂層在1050℃溫度下混合硫酸鹽中熱腐蝕行為。研究表明:相對于高溫條件,鋁硅涂層在1050℃下混合硫酸鹽中的熱腐蝕要嚴(yán)重得多。鋁硅涂層熱腐蝕70小時(shí)后開始失重,此時(shí)表面疏松的氧化膜不再具有保護(hù)作用,不僅涂層中Al和Ni直接與熔鹽相互作用,而且涂層中的Cr、Si也直接參與了與熔鹽的反應(yīng),同時(shí)高溫合金基體中的Ti也已擴(kuò)散至表面。在熱腐蝕90小時(shí)后其腐蝕層的深度已達(dá)約75μm。(2)研究了鋁硅涂層在1150℃溫度下混合硫酸鹽中熱腐蝕行為,并初步討論了其熱腐蝕機(jī)制。研究表明:鋁硅涂層在1150℃下混合硫酸鹽中發(fā)生了災(zāi)難性的熱腐蝕,熱腐蝕過程中Si元素呈向外擴(kuò)散趨勢,70h后,涂層中幾乎不含Si元素。熱腐蝕70h后占涂層50%左右的腐蝕區(qū)域已經(jīng)完全剝落。并且熱腐蝕70h后殘留區(qū)域的擴(kuò)散障在此溫度下能夠有效的抵御硫酸鹽的侵蝕,對基體起到了一定的保護(hù)作用。(3)研究了鋁硅涂層在1250℃溫度下混合硫酸鹽中熱腐蝕行為。研究表明:在熱腐蝕達(dá)到60h時(shí),腐蝕產(chǎn)物完全剝落,涂層僅剩下原有的50%左右,熱腐蝕80h已經(jīng)失重達(dá)到15.85mg/cm2,涂層已經(jīng)完全剝落,并且內(nèi)層擴(kuò)散障無法在1250℃下混合硫酸鹽的環(huán)境中長時(shí)間的抑制熔鹽的侵蝕,擴(kuò)散障內(nèi)部出現(xiàn)裂紋并且迅速的剝落,基體遭受了毀滅的破壞。(4)以鋁硅涂層為對象,在其表面預(yù)制了一層約8微米厚的保護(hù)性氧化膜,考察了其在1150℃下混合硫酸鹽中的熱腐蝕行為,并初步討論了其熱腐蝕機(jī)制。研究表明:預(yù)氧化鋁硅涂層在1150℃下混合硫酸鹽中熱腐蝕的前60h,其表面形成以氧化鋁為主的連續(xù)致密的保護(hù)性氧化膜,而且其熱腐蝕動(dòng)力學(xué)曲線呈現(xiàn)近似拋物線規(guī)律,熱腐蝕150h后,鋁硅涂層特有的內(nèi)層擴(kuò)散障表現(xiàn)出較好的抑制O、S等元素繼續(xù)侵入的作用。綜上所述,鋁硅涂層在超過1000℃混合硫酸鹽中遭受了較為嚴(yán)重的熱腐蝕,而預(yù)氧化對改善其抗超高溫?zé)岣g性能有一定的作用;本文研究結(jié)果進(jìn)一步證實(shí)了在開展抗超高溫氧化腐蝕金屬粘結(jié)層的研究的研究過程中,需更積極地關(guān)注其超高溫?zé)岣g行為及機(jī)理的研究。
[Abstract]:Gas turbine engine is an important symbol to embody the core competitiveness of the country. The inlet temperature of the turbine is a major feature of the advanced gas turbine engine. It is recognized that the thermal barrier coating is the most practical way to improve the service temperature of the engine in the world. Thermal corrosion (i.e., thermal oxidation under salt conditions) is directly related to the service life of the thermal barrier coating. This paper focuses on the research topic of "thermal barrier coating anti ultrahigh temperature oxidation corrosion metal bonding layer", with a good resistance to high temperature and hot corrosion, and the aluminum silicon coating with good stability of alumina film is easily formed at more than 1000 degrees. The microstructure, thermal corrosion kinetics, corrosion products and other thermal corrosion behaviors of the mixed sulphate at 1050, 1150 and 1250 C were investigated, and the thermal corrosion mechanism of Al Si coating in ultra high temperature environment was preliminarily discussed. At the same time, the thermal corrosion resistance of Al Si coating to improve the thermal corrosion resistance of Al Si coating was investigated. The research work and achievements are as follows: (1) the thermal corrosion behavior of Al Si coating at 1050 C is studied. The study shows that the aluminum silicon coating is at 1050 C relative to the high temperature condition. The hot corrosion in the mixed sulfate is much more serious. The thermal corrosion of the aluminum silicon coating begins to lose weight after 70 hours, and the loose oxide film is no longer protective, not only the Al and Ni in the coating interact directly with the molten salt, but also the Cr and Si in the coating are directly involved in the reaction with the molten salt, and the Ti in the superalloy matrix has also been expanded. After 90 hours of hot corrosion, the depth of the corrosion layer has reached about 75 M. (2). The thermal corrosion behavior of Al Si coating at 1150 C was investigated and its thermal corrosion mechanism was preliminarily discussed. The study showed that the aluminum silicon coating produced a catastrophic thermal corrosion in the mixed sulfate at 1150 C, and the Si element in the thermal corrosion process. There is an outward diffusion trend, after 70h, the coating contains almost no Si element. The corrosion area of about 50% of the coating after hot corrosion 70h has been completely peeled. And the diffusion barrier of the residual region after hot corrosion 70h can effectively resist the sulfate erosion at this temperature, and it has a definite protective effect on the matrix. (3) the aluminum silicon coating is studied in 1250. The study shows that the corrosion product is completely exfoliated when the thermal corrosion reaches 60H, only about 50% of the coating is left, the thermal corrosion 80h has been lost to 15.85mg/cm2, the coating has been completely peeled and the internal diffusion barrier can not be fused for a long time in the environment of mixed sulphate at 1250. The corrosion of salt, the cracks in the diffusion barrier and rapid exfoliation, the matrix suffered destruction. (4) a protective oxide film was prefabricated on the surface of aluminum and silicon with a protective oxide film of about 8 microns thick. The thermal corrosion of mixed sulphate at 1150 C was investigated and its thermal corrosion mechanism was preliminarily discussed. The surface of the alumina silicon coating at 1150 C in the mixture of sulphate and hot corrosion on the front 60H formed a continuous and dense protective oxide film on the surface, and its thermal corrosion kinetic curve showed an approximate parabolic law. After hot corrosion 150h, the internal diffusion barrier of the aluminum silicon coating showed a better inhibition of O, and the S and other elements continued to invade. In summary, the aluminum silicon coating has been subjected to more severe thermal corrosion in the mixed sulfate more than 1000 degrees C, and the preoxidation has a certain effect on improving its super high temperature corrosion resistance. Polar focus on its high temperature hot corrosion behavior and mechanism.

【學(xué)位授予單位】：江蘇大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TG174.4

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