CN115074654A - 一种抗cmas腐蚀的自愈合热障涂层及其制备方法 - Google Patents
一种抗cmas腐蚀的自愈合热障涂层及其制备方法 Download PDFInfo
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- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
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- C23C4/134—Plasma spraying
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- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
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- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
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Abstract
本发明公开一种抗CMAS腐蚀的自愈合热障涂层及其制备方法。自愈合热障涂层包括基体从下到上的粘结层、热障涂层、抗腐蚀层,粘结层材料为NiCrAlY;热障涂层材料为掺杂TiAl3的RE3TaO7;抗腐蚀层材料为抗腐蚀材料。制备方法包括预处理、粘结层制备、热障涂层制备、抗腐蚀层制备、烘干步骤。本发明以掺杂TiAl3的RE3TaO7作为热障涂层,既利用稀土钽酸盐优异的热绝缘性和抗CMAS性,又利用TiAl3作为愈合剂不仅可减少涂层开裂及孔洞,且可修复裂纹;以耐腐蚀性能和抗热震性能较好、能阻止CMAS渗透的抗腐蚀材料作为抗腐蚀层,从而形成抗CMAS腐蚀、耐高温性和热绝缘性较好的热障涂层。
Description
技术领域
本发明属于热障涂层技术领域,具体涉及一种抗CMAS腐蚀的自愈合热障涂层及其制备方法。
背景技术
热障涂层(Thermal Barrier Coatings,简称TBCs)是将耐高温、低导热、抗腐蚀的陶瓷材料以涂层的形式复合到基体金属上,通过降低热端部件的表面温度,从而延长基体构件的使用寿命,提高基体构件的可运行温度进而显著提升且热效率及性能。研究表明,CMAS颗粒对热障涂层的影响主要是在高温下(大于1250℃),熔融CMAS沿涂层表面的空隙和裂纹等缺陷渗入到陶瓷层内部,填充陶瓷层的开放式结构(孔洞、裂纹),使陶瓷层致密化,从而降低陶瓷层的应变容限从而诱发开裂,且在冷却过程中产生的脆性玻璃相导致陶瓷层应变容限降低而进一步诱发开裂。此外,热障涂层的抗腐蚀性能和热循环寿命不仅与涂层的材料有关,还受涂层相成分、组织、结构及CMAS成分等影响。因此,研究热障涂层需要深入研究特定成分的CMAS腐蚀规律,才能取得较好抗CMAS腐蚀效果。
岩棉在我国的建筑行业有着非常广泛的应用,岩棉的生产过程,其实是模拟了火山喷发这一自然过程,岩棉产品均采用优质玄武岩、白云石等为主要原材料,其组成成分包括氧化钙(CaO)、氧化镁(MgO)、氧化铝(Al2O3)、二氧化硅(SiO2)以及少量的氧化铁等,简称CMAS。原材料在1450℃以上高温熔化后置入离心机,随后经过各项工艺流程,得到具有一定性能的岩棉产品。
在使用离心机进行岩棉产品制备的过程中存在以下问题:(1)离心机的工作环境在1450~2000℃,在离心过程中,转速为8000~14000rpm。为了提高离心机的耐高温性、热绝缘性和耐磨性,目前通过在拉丝用离心机的工件上制备氧化钇稳定性化氧化锆(YSZ)涂层,然而当工作温度超过1200℃时,原材料中熔融的氧化钙(CaO)、氧化镁(MgO)、氧化铝(Al2O3)、二氧化硅(SiO2)会渗透到YSZ涂层的孔隙中,与热障涂层的成分反生反应,使得YSZ涂层受到严重腐蚀,导致涂层脱落,进而快速腐蚀钢制的离心机,从而降低离心机的使用寿命。(2)虽然离心机具有冷却系统,但会使得熔融体温度减低,粘度增大,容易形成渣球,因此离心机的工作面持续保持高温很有必要,但工件面会因高温而遭到损耗。
现有技术中,针对YSZ涂层在1200℃以上抗CMAS腐蚀下降的问题,有通过在YSZ涂层表面,设置由稀土铝酸盐石榴石结构化合物、稀土铝酸盐钙钛矿化合物或稀土锆酸盐中掺杂Sc2O3构成第二陶瓷层,即利用第二陶瓷层的稀土铝酸盐很低的氧透过率提高了涂层的抗氧化性,又能利用第二陶瓷层的R3Al5O12、稀土掺杂R3Al5O12及掺杂Sc2O3的稀土锆酸盐本身较低的热导率,与YSZ涂层形成双陶瓷层热障涂层以提高隔热性能。也有通过在热障陶瓷层的表面进行激光重熔以得到激光重熔层,从而对陶瓷层进行表面改性,优化热障陶瓷层的表面组织、细化晶粒,提高表面的致密度,减少表面的孔洞以及大颗粒,从而减少陶瓷层内部的CMAS扩散通道以提高抗CMAS腐蚀性。但是,由于单纯的稀土锆酸盐、稀土铝酸盐作为陶瓷层的断裂韧性较差,并且会与粘结层反应生成铝酸盐而影响服役寿命;此外,上述技术方案都是在YSZ涂层的基础上通过增加涂层或进行表面改性,以提高YSZ涂层的性能,由于YSZ涂层固有的问题仍然存在,导致其1450℃以上的高温抗腐蚀性提升有限。因此,根据1450~2000℃的高温使用环境,结合岩棉产品制备中CMAS的成分特定,有针对性的研究一种具有优异的高温稳定性,且抗腐蚀性和抗氧化性能较强的热障涂层是提高岩棉用离心机使用寿命的关键。
发明内容
本发明的第一目的在于提供一种抗CMAS腐蚀的自愈合热障涂层,第二目的在于提供一种抗CMAS腐蚀的自愈合热障涂层的制备方法。
本发明的第一目的是这样实现的:包括设置于基体上的粘结层以及从下到上依次设置于粘结层上的热障涂层、抗腐蚀层,所述粘结层的材料为NiCrAlY;所述热障涂层的材料为掺杂TiAl3的RE3TaO7,其中RE为Y、La、Nd、Pm、Sm、Eu、Gd、Tb、Dy、Ho、Er、Tm、Yb、Lu中的任意一种或两种;所述抗腐蚀层的材料为碳钛化铝、矾钛化铝、铬钛化铝、钛氮化铝、钼碳化铝、铌碳化铝、碳化钛、碳硅化钛中的任意一种或几种的组合。
本发明的第二目的是这样实现的:包括预处理、粘结层制备、热障涂层制备、抗腐蚀层制备、烘干步骤,具体步骤为:
A、预处理:将金属基体进行清洗和喷砂处理;
B、粘结层制备:采用热喷涂工艺在预处理后的金属基体表面制备NiCoCrAlY粘结层;
C、热障涂层制备:按(17~19):(1~3)的质量比称取RE3TaO7与TiAl3粉末并混合均匀,然后采用大气等离子喷涂工艺在粘结层上制备热障涂层;其中,RE为Y、La、Nd、Pm、Sm、Eu、Gd、Tb、Dy、Ho、Er、Tm、Yb、Lu中的任意一种或两种;
D、抗腐蚀层制备:将碳钛化铝、矾钛化铝、铬钛化铝、钛氮化铝、钼碳化铝、铌碳化铝、碳化钛、碳硅化钛中的任意一种或几种的组合的乙醇浆料涂刷在热障涂层上,制备得到抗腐蚀层;
E、烘干:在涂刷上述乙醇浆料后进行真空或气氛烘干,得到抗CMAS腐蚀的自愈合热障涂层。
本发明的有益效果:
1、为了提高离心机涂层的抗CMAS腐蚀性能和隔热性能,本发明采用掺杂TiAl3的RE3TaO7(稀土钽酸盐)作为耐腐蚀的热障涂层,既利用RE3TaO7具有热导率较小(1.1~2.1W·m-1·K-1,25~900℃)[明显低于YSZ(2.3~3.5W·m-1·K-1,900℃),低于RE2Zr2O7(1.3~2.5W·m-1·K-1,900℃)]、较高的热膨胀系数8.8~10.6×10-6 K-1(100-1200℃)、合适的硬度(5.0~10GPa)和较小的杨氏模量(131.0~260.0GPa),从而对CMAS熔体的高温腐蚀表现出较好的抵抗力和优异的氧障性能;同时,还利用TiAl3作为愈合剂,在高温时与O2发生氧化反应,不仅使得Al元素高温条件下形成氧化物可填充RE3TaO7陶瓷层的开放式结构(孔洞、裂纹),使陶瓷层致密化,从而可延缓CMAS沿表面缺陷渗入到陶瓷层内部,减缓乃至避免陶瓷层应变容限的降低而诱发开裂,而且高温条件下形成的氧化物还可以修复陶瓷层产生的裂纹以避免进一步扩展,从而实现涂层的自愈合修复,而且TiAl3还能对CMAS和氧气起到一定的抑制作用。因此,本发明掺杂TiAl3的RE3TaO7(稀土钽酸盐)作为热障涂层,不仅具有优异的热绝缘性和高温稳定性,还具有自愈合功能,从而形成良好的抗CMAS腐蚀性能,可显著延长涂层的使用寿命。
2、本发明在热障涂层上以碳钛化铝(Ti3AlC2和Ti2AlC)、矾钛化铝(V2AlC)、铬钛化铝(Cr2AlC)、钛氮化铝(Ti2AlN)、钼碳化铝(Mo3AlC2)、铌碳化铝(Nb2AlC),碳化钛(Ti3C2和Ti2C)、碳硅化钛(Ti3SiC2)中的一种或几种组合作为抗腐蚀层的原料,然后与乙醇按质量比(1~2):(1~2)混合制成浆料,用刷涂的方式在表面制备10-500µm的抗腐蚀层。其原理为:抗腐蚀层的上述成分具有较低的密度和较高的强度,较好的耐腐蚀性能和抗热震性能,并且抗腐蚀层中含有大量的Ti和Al等,当与熔融状态的CMAS接触时,V 、Al、Cr、Nb、Mo和Ti等向熔体中迁移,促进CMAS熔体的结晶,阻止CMAS的渗透,所以抗腐蚀层具有作为CMAS抗腐蚀防护层的潜力。
3、本发明以NiCrAlY作为粘结层,特别是通过超音速火焰喷涂工艺形成的粘结层,不仅粘结层与基体具有较高的结合强度,而且热膨胀系数11~14×10-6K-1处于基体金属的13~18×10-6K-1与RE3TaO7陶瓷8.8~10.6×10-6 K-1之间,从而可避免热障涂层与金属基体的热失配,有效提高了热障涂层的抗热震性能。
综上所述,本发明根据岩棉用离心机高温及CMAS成分特点,在粘结层上采用双陶瓷层结构,并针对性的选用特定的涂层材料以及涂层工艺,从而使涂层的相成分、组织、结构形成针对性较强的形式,以解决岩棉用离心机工作过程中抗CMAS腐蚀性能差、隔热效果差和高温稳定性差等问题,显著提高了岩棉用离心机的使用寿命。
附图说明
图1为实施例1中涂层在1400℃下CMAS腐蚀2h后的横截面扫描电镜图谱;
图2(a)为对比例1中涂层在1400℃下CMAS腐蚀2h后的横截面扫描电镜图谱;
图2(b)为对比例2中涂层在1400℃下CMAS腐蚀2h后的横截面扫描电镜图谱;
图3为对比例3中涂层在1400℃下CMAS腐蚀2h后的横截面扫描电镜图谱;
图4 (a)为图3中标记点31的点扫描能谱图;
图4 (b)为图3中标记点32的点扫描能谱图;
图中:A-涂层表层(包括热障涂层及抗腐蚀层),B-粘结层,C-基体。
具体实施方式
下面结合附图和实施例对本发明作进一步的说明,但不以任何方式对本发明加以限制,基于本发明教导所作的任何变更或改进,均属于本发明的保护范围。
如图1至图4所示,本发明之抗CMAS腐蚀的自愈合热障涂层,包括设置于基体上的粘结层以及从下到上依次设置于粘结层上的热障涂层、抗腐蚀层,所述粘结层的材料为NiCrAlY;所述热障涂层的材料为掺杂TiAl3的RE3TaO7,其中RE为Y、La、Nd、Pm、Sm、Eu、Gd、Tb、Dy、Ho、Er、Tm、Yb、Lu中的任意一种或两种;所述抗腐蚀层的材料为碳钛化铝、矾钛化铝、铬钛化铝、钛氮化铝、钼碳化铝、铌碳化铝、碳化钛、碳硅化钛中的任意一种或几种的组合。
所述粘结层的厚度为40~80µm,所述热障涂层的厚度为140~200µm且致密度>98%,所述抗腐蚀层的厚度为50~500µm且致密度>98%,所述抗CMAS腐蚀的自愈合热障涂层的总厚度为260~830µm。
所述热障涂层中RE3TaO7与TiAl3的质量比为85~95:5~15。
所述粘结层采用超音速火焰喷涂NiCrAlY制备得到,所述热障涂层采用大气等离子喷涂掺杂TiAl3的RE3TaO7制备得到,所述抗腐蚀层采用涂刷碳钛化铝、矾钛化铝、铬钛化铝、钛氮化铝、钼碳化铝、铌碳化铝、碳化钛、碳硅化钛中的任意一种或几种组合的乙醇浆料得到。
本发明之抗CMAS腐蚀的自愈合热障涂层的制备方法,包括预处理、粘结层制备、热障涂层制备、抗腐蚀层制备、烘干步骤,具体步骤为:
A、预处理:将金属基体进行清洗和喷砂处理;
B、粘结层制备:采用热喷涂工艺在预处理后的金属基体表面制备NiCoCrAlY粘结层;
C、热障涂层制备:按(85~95):(5~15)的质量比称取RE3TaO7与TiAl3粉末并混合均匀,然后采用大气等离子喷涂工艺在粘结层上制备热障涂层;其中,RE为Y、La、Nd、Pm、Sm、Eu、Gd、Tb、Dy、Ho、Er、Tm、Yb、Lu中的任意一种或两种;
D、抗腐蚀层制备:将Ti3C2的乙醇浆料涂刷在热障涂层上,制备得到抗腐蚀层;
E、烘干:在涂刷Ti3C2乙醇浆料后进行真空或气氛烘干,得到抗CMAS腐蚀的自愈合热障涂层。
所述NiCoCrAlY粘结层的厚度为40~80µm,所述热障涂层的厚度为140~200µm且致密度>98%,所述抗腐蚀层的厚度为10~500µm且致密度>98%,所述抗CMAS腐蚀的自愈合热障涂层的总厚度为260~830µm。
所述A步骤中的金属基体经除油清洗、吹干后再进行喷丸或喷砂处理,处理后基体表面的粗糙度为Ra 1.1~1.6。
所述A步骤中喷砂处理是用喷砂设备在清洗后的基体表面采用粒径30~50μm的刚玉砂进行喷砂处理。
所述B步骤中采用超音速火焰喷涂工艺在金属基体表面制备NiCoCrAlY粘结层,所述超音速火焰喷涂工艺的参数为:氧气压强0.4~1.1MPa,氢气压强0.5~1.2MPa,送粉气压强0.9~1.2MPa,喷涂距离200~240mm。
所述B步骤中超音速火焰喷涂时基体温度为100~400℃。
所述B步骤超音速火焰喷涂工艺中的冷却进水温度0~35℃且回水温度不高于60℃。
所述C步骤中RE3TaO7的粒径在70~90µm,球形率>90%,流动性为25~60s/50g;所述TiAl3的粒径在15~45µm;所述RE3TaO7及TiAl3的纯度>99.99%;所述大气等离子喷涂工艺的参数为:喷涂电压60~75V,电流540~620A,氩气流量20~25L/min,氢气流量4~8L/min,送粉率35~43g/min,喷涂距离80~100mm。
所述C步骤中大气等离子喷涂时基体温度为100~400℃。
所述D步骤中的乙醇浆料是将原料与乙醇按(1~2):(1~2)的质量比混合得到;其中,原料中的碳钛化铝包括Ti3AlC2、Ti2AlC,矾钛化铝为V2AlC,铬钛化铝为Cr2AlC,钛氮化铝为Ti2AlN,钼碳化铝为Mo3AlC2,铌碳化铝为Nb2AlC,碳化钛包括Ti3C2、Ti2C,碳硅化钛为Ti3SiC2。
所述E步骤中是在涂刷Ti3C2乙醇浆料后在70~120℃且真空度<5×10-3或通入氩气的气氛下烘干,烘干时间>200h。
实施例1
S100:用丙酮除去离心机工作基体表面的污渍并晾干或吹干,然后再用粒径40µm的刚玉砂进行表面喷砂处理,使基体表面粗糙度约为Ra 1.3。
S200:接着用超音速火焰喷涂(HVOF)工艺在预处理后的金属基体表面喷涂一层厚度约70µm的NiCrAlY粘结层,其中超音速火焰喷涂(HVOF)的工艺参数为:氧气压强0.4~1.1MPa, 氢气压强为0.5~1.2MPa, 送粉气压强为0.9~1.2MPa,喷涂距离为200~240mm。
S300:将稀土钽酸盐Y3TaO7与TiAl3按质量比9:1混合均匀,然后采用大气等离子喷涂工艺在粘结层上喷涂一层厚度约140µm的热障涂层,其中大气等离子喷涂的工艺参数为:喷涂电压60~75V,电流540~620A,氩气流量20~25L/min,氢气流量4~8L/min,送粉率35~43g/min,喷涂距离80~100mm。
S300:将碳化钛(Ti3C2)与无水乙醇按质量比1:2混合成浆料,然后将其刷涂在热绝缘层上形成厚度约500µm的抗腐蚀层;
S400:在涂刷Ti3C2乙醇浆料后,再将其置于气氛炉(氩气)中,在120℃保温200h后取出,制备得到包括粘结层、热绝缘层和抗腐蚀层的自愈合热障涂层,总厚度为710µm。
如图1所示,通过能谱分析可知,涂层的标记点A中没有检测到CMAS成分,如表1所示,涂层中只有Y、Ta、Ti、Al、O等元素(表1中的原子含量百分比之和不是100%,说明Y3TaO7有空位缺陷,出现非化学计量比,晶体结构出现畸变,有利于降低涂层热导率,提高涂层的热绝缘性能),并没有检测到MgO、SiO2和CaO成分,说明本发明制备的涂层表现出较好的抗CMAS腐蚀性。
表1热障涂层(Y3TaO7+ TiAl3)的表层和中间层的原子含量百分比
对比例1
与实施例1的区别在于抗腐蚀层的厚度不同,本例中抗腐蚀层的厚度为400µm,将其在1400℃进行CMAS腐蚀实验2h后,如图2(a)所示,涂层中没有检测到CMAS成分,表明抗腐蚀性能保持较好。
对比例2
与实施例1的区别在于抗腐蚀层的厚度不同, 本例中抗腐蚀层的厚度为200µm,将其在1400℃进行CMAS腐蚀实验2h后,如图2(b)所示,涂层中没有检测到CMAS成分,表明抗腐蚀性能保持较好。
实施例2
S100:将离心机工作基体表面放入NaOH溶液中浸泡除油,然后用乙醇进行超声清洗并干燥,最后再用粒径30µm的刚玉砂进行表面喷砂处理,使基体表面粗糙度约为Ra 1.6。
S200:接着用超音速火焰喷涂(HVOF)工艺在预处理后的金属基体表面喷涂一层厚度约50µm的NiCrAlY粘结层,其中超音速火焰喷涂(HVOF)的工艺参数为:氧气压强0.4~1.1MPa, 氢气压强为0.5~1.2MPa, 送粉气压强为0.9~1.2MPa,喷涂距离为200~240mm。
S300:将稀土钽酸盐Gd3TaO7与TiAl3按质量比17:3混合均匀,然后采用大气等离子喷涂工艺在粘结层上喷涂一层厚度约100µm的热障涂层,其中大气等离子喷涂的工艺参数为:喷涂电压60~75V,电流540~620A,氩气流量20~25L/min,氢气流量4~8L/min,送粉率35~43g/min,喷涂距离80~100mm。
S300:将质量比为1:1的碳钛化铝(Ti3AlC2)与碳化钛(Ti3C2)混合,然后与无水乙醇按质量比2:1混合成浆料,将其刷涂在热绝缘层上形成厚度约300µm的抗腐蚀层;
S400:在涂刷上述乙醇浆料后,再将其置于气氛炉(氩气)中,在100℃保温250h后取出,制备得到包括粘结层、热绝缘层和抗腐蚀层的自愈合热障涂层,总厚度为450µm。
将实施例2制备得到的自愈合热障涂层在1400℃进行CMAS腐蚀实验2h,发现CMAS腐蚀深度为50µm,表明Gd3TaO7具有较好的抗腐蚀性能。
对比例3
与实施例2的区别在于热障涂层为YTaO4+GdTaO4+ TiAl3,其质量比为5:4:1,如图3和4所示,图3中扫描电镜的标记点31为抗腐蚀层,通过对应的能谱图-图4(a)可知,抗腐蚀层中含有大量的Al2O3、MgO、SiO2和CaO;标记点32为热障涂层,通过对应的能谱图-图4(b)可知,没有检测到CMAS成分,表明CMAS成分没有渗透到YTaO4+ GdTaO4陶瓷中。
Claims (10)
1.一种抗CMAS腐蚀的自愈合热障涂层,其特征在于包括设置于基体上的粘结层以及从下到上依次设置于粘结层上的热障涂层、抗腐蚀层,所述粘结层的材料为NiCrAlY;所述热障涂层的材料为掺杂TiAl3的RE3TaO7,其中RE为Y、La、Nd、Pm、Sm、Eu、Gd、Tb、Dy、Ho、Er、Tm、Yb、Lu中的任意一种或两种;所述抗腐蚀层的材料为碳钛化铝、矾钛化铝、铬钛化铝、钛氮化铝、钼碳化铝、铌碳化铝、碳化钛、碳硅化钛中的任意一种或几种的组合。
2.根据权利要求1所述抗CMAS腐蚀的自愈合热障涂层,其特征在于所述粘结层的厚度为40~80µm,所述热障涂层的厚度为140~200µm且致密度>98%,所述抗腐蚀层的厚度为10~500µm且致密度>98%,所述抗CMAS腐蚀的自愈合热障涂层的总厚度为260~830µm。
3.根据权利要求1所述抗CMAS腐蚀的自愈合热障涂层,其特征在于所述热障涂层中RE3TaO7与TiAl3的质量比为(17~19):(1~3);所述碳钛化铝包括Ti3AlC2、Ti2AlC,所述矾钛化铝为V2AlC,所述铬钛化铝为Cr2AlC,所述钛氮化铝为Ti2AlN,所述钼碳化铝为Mo3AlC2,所述铌碳化铝为Nb2AlC,所述碳化钛包括Ti3C2、Ti2C,所述碳硅化钛为Ti3SiC2。
4.根据权利要求1、2或3所述抗CMAS腐蚀的自愈合热障涂层,其特征在于所述粘结层采用超音速火焰喷涂NiCrAlY制备得到,所述热障涂层采用大气等离子喷涂掺杂TiAl3的RE3TaO7制备得到,所述抗腐蚀层采用涂刷碳钛化铝、矾钛化铝、铬钛化铝、钛氮化铝、钼碳化铝、铌碳化铝、碳化钛、碳硅化钛中的任意一种或几种组合的乙醇浆料得到。
5.一种抗CMAS腐蚀的自愈合热障涂层的制备方法,其特征在于包括预处理、粘结层制备、热障涂层制备、抗腐蚀层制备、烘干步骤,具体步骤为:
A、预处理:将金属基体进行清洗和喷砂处理;
B、粘结层制备:采用热喷涂工艺在预处理后的金属基体表面制备NiCoCrAlY粘结层;
C、热障涂层制备:按(17~19):(1~3)的质量比称取RE3TaO7与TiAl3粉末并混合均匀,然后采用大气等离子喷涂工艺在粘结层上制备热障涂层;其中,RE为Y、La、Nd、Pm、Sm、Eu、Gd、Tb、Dy、Ho、Er、Tm、Yb、Lu中的任意一种或两种;
D、抗腐蚀层制备:将碳钛化铝、矾钛化铝、铬钛化铝、钛氮化铝、钼碳化铝、铌碳化铝、碳化钛、碳硅化钛中的任意一种或几种的组合乙醇浆料涂刷在热障涂层上,制备得到抗腐蚀层;
E、烘干:在涂刷上述乙醇浆料后进行真空或气氛烘干,得到抗CMAS腐蚀的自愈合热障涂层。
6.根据权利要求5所述抗CMAS腐蚀的自愈合热障涂层的制备方法,其特征在于所述NiCoCrAlY粘结层的厚度为40~80µm,所述热障涂层的厚度为140~200µm且致密度>98%,所述抗腐蚀层的厚度为10~500µm且致密度>98%,所述抗CMAS腐蚀的自愈合热障涂层的总厚度为260~830µm。
7.根据权利要求5所述抗CMAS腐蚀的自愈合热障涂层的制备方法,其特征在于所述B步骤中采用超音速火焰喷涂工艺在金属基体表面制备NiCoCrAlY粘结层,所述超音速火焰喷涂工艺的参数为:氧气压强0.4~1.1MPa,氢气压强0.5~1.2MPa,送粉气压强0.9~1.2MPa,喷涂距离200~240mm。
8.根据权利要求5所述抗CMAS腐蚀的自愈合热障涂层的制备方法,其特征在于所述C步骤中RE3TaO7的粒径在45~105µm,球形率>90%,流动性为25~60s/50g;所述TiAl3的粒径在15~45µm;所述RE3TaO7及TiAl3的纯度>99.99%;所述大气等离子喷涂工艺的参数为:喷涂电压60~75V,电流540~620A,氩气流量20~25L/min,氢气流量4~8L/min,送粉率35~43g/min,喷涂距离80~100mm。
9.根据权利要求5所述抗CMAS腐蚀的自愈合热障涂层的制备方法,其特征在于所述D步骤中的乙醇浆料是将原料与乙醇按(1~2):(1~2)的质量比混合得到;其中,原料中的碳钛化铝包括Ti3AlC2、Ti2AlC,矾钛化铝为V2AlC,铬钛化铝为Cr2AlC,钛氮化铝为Ti2AlN,钼碳化铝为Mo3AlC2,铌碳化铝为Nb2AlC,碳化钛包括Ti3C2、Ti2C,碳硅化钛为Ti3SiC2。
10.根据权利要求5所述抗CMAS腐蚀的自愈合热障涂层的制备方法,其特征在于所述E步骤中是在涂刷乙醇浆料后在70~120℃且真空度<5×10-3或通入氩气的气氛下烘干,烘干时间>200 h。
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