本文選題：自愈合材料 + 熱障涂層　； 參考：《華中科技大學(xué)》2016年博士論文

【摘要】：熱障涂層(簡稱TBC),是由三個部分組成：1)粘接層(簡稱BC),2)熱生長氧化物(簡稱TGO)和3)陶瓷頂層(簡稱TC)。當(dāng)TBC在高溫下服役時,TGO才會生成。而在TGO生成的初期,TGO可以在一定的程度上起到抑制氧化物生長的作用,即可視為抗氧化涂層。但是隨著TBC在高溫下服役時間的延長,TGO不斷生長并最終導(dǎo)致了涂層整體的破壞性剝落。TGO是造成TBC破壞的主要原因。近年來,有多種能夠提高TBC抗氧化性與壽命的方法被報道。其中,根據(jù)科研人員報道可知,A1203(在1400℃時,其氧擴散系數(shù)為-10-12。cm2/s)薄膜具有良好的抗氧化性。另外,還有很多研究人員也得出了相似的結(jié)論,即A1203薄膜／涂層的確能在一定程度上提高TBC的抗氧化性。但是經(jīng)過大氣等離子噴涂技術(shù)(簡稱APS)設(shè)備噴涂態(tài)的A1203或者Al2O3/YSZ涂層,本征的就具備很高的孔隙率,這會導(dǎo)致涂層的抗氧化性降低。自愈合材料包括陶瓷材料,高分子化合物材料,金屬材料和復(fù)合材料。正如其名字自愈合所表達的含義一樣,在材料本身由于加熱、受力、受到?jīng)_擊或其他因素而造成了損傷時,自愈合材料具有能夠修復(fù)自生的特性。目前,除了部分關(guān)于防腐涂層的自愈合材料應(yīng)用的研究外,鮮有關(guān)于熱障涂層方面的自愈合材料應(yīng)用研究。自愈合材料具有提高涂層的抗氧化性的可能性,其原理是通過密封效應(yīng)提高涂層的孔隙率,減少涂層中的氧擴散通道。在相關(guān)的研究中,NASA中心的研究者們研究了航空發(fā)動機高溫部件上使用輕質(zhì)自愈合陶瓷材料,并且通過研究得知SiC及其對應(yīng)的氧化物能夠有足夠的塑性來阻止裂紋的擴展,同時也有自愈合的能力來密封裂紋并阻止氧的侵入。本課題組的前期研表明,TiC能夠很好的實現(xiàn)自愈合功能,并且在防氚滲透涂層方面有很成功的應(yīng)用。本文研究了基于TiC的自愈合涂層、基于SiC的自愈合涂層、Cr2O3-Al2O3共格抗氧化涂層和氮化抗氧化涂層的制備工藝,研究了這些抗氧化涂層對復(fù)合TBC的抗氧化性,抗剝落性,抗熱循環(huán)性和抗熱腐蝕性的影響。主要的結(jié)論如下所述：(1)TAZ20對應(yīng)的成分(其成分為20 wt% TiC,40 wt% Al2O3和40 wt% YSZ)被認(rèn)為是最適合做基于TiC自愈合涂層的成分。經(jīng)過自愈合熱處理后,TAZ20自愈合涂層中的孔隙率從9.96%下降至3.28%。經(jīng)過成分優(yōu)化設(shè)計可知,TAZ20自愈合熱障涂層在1000℃下表現(xiàn)出最好的抗氧化性。其TGO生成面積為6.67%,僅為傳統(tǒng)熱障涂層TGO生成面積的50.11%。而經(jīng)過1000℃熱循環(huán)測試可知,在該條件下,TAZ20自愈合熱障涂層的壽命大幅度提高。(2)首先,最適用與基于TiC自愈合熱障涂層的TAZ20涂層厚度為10um左右,因為過厚的TAZ20涂層厚度會引起不必要的體積增生和體積應(yīng)變,進而會導(dǎo)致涂層中的裂紋萌發(fā)和擴展。三層陶瓷層結(jié)構(gòu)(TAZ20/YSZ/TAZ20)的TiC自愈合熱障涂層在1100℃下具有最好的抗氧化性和抗熱循環(huán)性。經(jīng)過氧化,該涂層的氧化增重、氧化失重和壽命分別為同批次傳統(tǒng)TBC的64.77%,48.91%和188.24%。在900℃的75 wt% Na2SO4+25 wt% NaCl熱腐蝕實驗中,三層陶瓷結(jié)構(gòu)的TiC自愈合熱障涂層也具有良好的抗熱腐蝕性能。(3)SAZ10對應(yīng)的成分(其成分為10 vol% SiC,45vol% Al2O3和45vol% YSZ)被認(rèn)為是最適合做基于SiC自愈合涂層的成分。經(jīng)過自愈合熱處理后,SAZ10自愈合涂層中的孔隙率從9.39%下降至1.94%。而在諸多基于SiC的自愈合熱障涂層中,SAZ10自愈合熱障涂層在1100℃下表現(xiàn)出最好的抗氧化性。其TGO生成面積為37.11%,僅為傳統(tǒng)熱障涂層TGO生成面積的57.90%。而經(jīng)過1100℃熱循環(huán)測試可知,SAZ10的壽命為傳統(tǒng)熱障涂層的128.57%。(4)首先,最適用與基于SiC自愈合熱障涂層的SAZ10涂層厚度為10um左右,因為過厚的SAZ涂層厚度會引起不必要的體積增生和體積應(yīng)變,進而會導(dǎo)致涂層中的裂紋萌發(fā)和擴展。三層陶瓷層結(jié)構(gòu)(SAZ10/YSZ/SAZ10)的SiC自愈合熱障涂層在1100℃下具有最好的抗氧化性和抗熱循環(huán)性。經(jīng)過氧化,該涂層的氧化增重、氧化失重和壽命分別為同批次傳統(tǒng)TBC的61.38%,38.87%和171.43%。在900℃的75 wt% Na2SO4+25 wt% NaCl熱腐蝕實驗中,三層陶瓷結(jié)構(gòu)的SiC自愈合熱障涂層也具有良好的抗熱腐蝕性能。(5)本文創(chuàng)新性的設(shè)計了一種氮化TBC。在制備YSZ涂層之前,現(xiàn)在粘接層的表面進行氮化處理。由1]00℃高溫氧化研究可知,該涂層的氧化增重和氧化失重分別為同批次傳統(tǒng)TBC的85.90%和56.11%。其1100℃熱循環(huán)壽命為傳統(tǒng)TBC的123.33%。(6)本文創(chuàng)新性的設(shè)計了一種Cr2O3-Al2O3TBC。經(jīng)學(xué)者研究,Cr2O3-Al2O3涂層具有較低的孔隙率,這意味著該涂層能夠減少氧擴散的通道。另外,A1203具有良好的抗氧化性,它可以抑制TGO的生長。研究結(jié)果表明,由1100℃高溫氧化實驗可知,該涂層的氧化增重和氧化失重分別為同批次傳統(tǒng)TBC的68.99%和63.92%。其1100℃熱循環(huán)壽命為傳統(tǒng)TBC的123.08%。
[Abstract]:The thermal barrier coating (TBC) is made up of three parts: 1) adhesive layer (BC), 2) hot growth oxide (TGO) and 3) ceramic top layer (TC). When TBC is in service at high temperature, TGO will be generated. In the initial stage of TGO generation, TGO can act as an antioxidant coating on a certain range, but it can be considered as an antioxidant coating. With the prolongation of the service time of TBC at high temperature, the continuous growth of TGO and eventually lead to the overall destructive exfoliation of the coating.TGO is the main cause of TBC damage. In recent years, a variety of methods to improve the antioxidant and life of TBC have been reported. Among them, according to researchers, A1203 (at 1400 degrees, its oxygen diffusivity) -10-12.cm2/s films have good antioxidant properties. In addition, many researchers have come to the same conclusion that A1203 film / coating can indeed improve the oxidation resistance of TBC to a certain extent. But after the spraying of A1203 or Al2O3/YSZ coatings by atmospheric plasma spraying (APS) equipment, the intrinsic properties are available. High porosity, which leads to a decrease in the oxidation resistance of the coating. Self healing materials include ceramic, polymer, metal, and composite. As its name is self healing, the material itself is damaged by heating, force, impact, or other factors. In addition to the research on the application of self healing materials for anticorrosive coatings, there are few studies on the application of self healing materials on thermal barrier coatings. Self healing materials have the possibility of improving the oxidation resistance of the coating. The principle is to increase the porosity of the coating by the sealing effect and reduce the coating in the coating. In the related study, researchers at the NASA center studied the use of light self healing ceramic materials on aero engine high-temperature components, and by studying that SiC and its corresponding oxides can be plastic enough to prevent crack growth and also have self healing ability to seal cracks and prevent oxygen. Intruding. The research group has shown that TiC can achieve self healing function well and has a successful application in the tritium permeation coating. This paper studied the self-healing coating based on TiC, the self healing coating based on SiC, the preparation process of the Cr2O3-Al2O3 CO oxidation coating and the nitriding antioxidant coating, and studied the oxygen resistance of these coatings. The effect of coating on the oxidation resistance, resistance to exfoliation, thermal cycling and thermal corrosion resistance of composite TBC. The main conclusions are as follows: (1) the corresponding components of TAZ20 (whose components are 20 wt% TiC, 40 wt% Al2O3 and 40 wt% YSZ) are considered to be the most suitable components based on the self healing coating based on TiC. After self healing heat treatment, TAZ20 self healing coating The porosity in the layer decreases from 9.96% to 3.28%. through optimization design. It is known that the TAZ20 self healing thermal barrier coating exhibits the best antioxidant activity at 1000 C. Its TGO area is 6.67%, only 50.11%. of the traditional thermal barrier coating TGO area, and the thermal cycle test of the TAZ20 self healing thermal barrier coating under this condition is known. (2) first, the thickness of the TAZ20 coating which is most suitable for TiC self healing thermal barrier coating is about 10um, because the thickness of the thick TAZ20 coating thickness will cause unnecessary volume proliferation and volume strain, and then lead to the crack germination and expansion in the coating. The TiC self healing heat of the ceramic layer structure (TAZ20/YSZ/TAZ20) of the coating is self healing heat. The barrier coating has the best antioxidant and thermal cycling performance at 1100 C. After oxidation, the oxidation weight increases, and the oxidation weight loss and life span are 64.77%, 48.91% and 188.24%. of the same batch of traditional TBC, 75 wt% Na2SO4+25 wt% NaCl hot corrosion test at 900 C, and the TiC self healing thermal barrier coating of the three layer ceramic ceramic structure is also good. Thermal corrosion resistance. (3) SAZ10 corresponding component (its components 10 vol% SiC, 45vol% Al2O3 and 45vol% YSZ) is considered the most suitable component based on SiC self healing coating. After self healing heat treatment, the porosity in the SAZ10 self healing coating decreases from 9.39% to 1.94%. and in a number of SiC self-healing thermal barrier coatings, SAZ10 self The healing thermal barrier coating shows the best antioxidation at 1100 C. Its TGO area is 37.11%, only 57.90%. of the TGO area of the traditional thermal barrier coating. Through the 1100 C thermal cycle test, the life of SAZ10 is 128.57%. (4) of the traditional thermal barrier coating, and the most suitable for the SiC self healing thermal barrier coating is 1 of the thickness of the coating of 1. About 0um, because the thick SAZ coating thickness will cause unnecessary volume proliferation and volume strain, which will lead to the crack germination and expansion in the coating. The SiC self healing thermal barrier coating of the three layer ceramic layer structure (SAZ10/YSZ/SAZ10) has the best antioxidant and thermal cycling resistance at 1100 C. Oxidation, the oxidation weight increase of the coating The oxidation weightlessness and life span are 61.38%, 38.87% and 171.43%. in the same batch of traditional TBC, 75 wt% Na2SO4+25 wt% NaCl hot corrosion test at 900 C. The SiC self healing thermal barrier coating of the three layer ceramic structure also has good thermal corrosion resistance. (5) this article innovatively designed a nitriding TBC. to be bonded before the preparation of the YSZ coating. The surface of the layer is nitridation. From the high temperature oxidation at 1]00 C, it is found that the oxidation weight gain and oxidation weight loss of the coating are 85.90% and 56.11%. of the same batch of traditional TBC, respectively, and the thermal cycle life of the traditional TBC is 123.33%. (6) of the traditional TBC. This article innovatively designed a kind of Cr2O3-Al2O3TBC. study by scholars, and the Cr2O3-Al2O3 coating has a lower level. Porosity, which means that the coating can reduce the channel of oxygen diffusion. In addition, A1203 has good oxidation resistance, and it can inhibit the growth of TGO. The results show that the oxidation weight gain and oxidation weight loss of the coating are 68.99% and 63.92%. of the same batch of TBC, and the thermal cycle life of the coating at 1100 degrees centigrade, respectively. 123.08%. of traditional TBC
【學(xué)位授予單位】：華中科技大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2016
【分類號】：TG174.4

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本文編號：2050685