CN113789496A - 一种自愈合梯度热障涂层的制备方法 - Google Patents
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Abstract
一种自愈合梯度热障涂层的制备方法:对高温合金基体进行清洗和喷砂处理,然后采用超音速火焰喷涂制备结合层;采用大气等离子喷涂将自愈合粉末喷涂在结合层上,制备自愈合梯度热障涂层;然后利用激光重熔工艺在自愈合梯度热障涂层表面制备激光改性区,完成后处理;本发明采用TiAl3为自愈合剂,YSZ为陶瓷材料,充分利用自愈合材料在高温下发生氧化反应,产生的氧化物填补涂层中的气孔、裂纹等缺陷,实现裂纹梯度愈合效应,并阻滞裂纹的进一步扩展;同时激光改性区形成的柱状晶结构和垂直裂纹可提高涂层的应变容限能力,从而显著提高涂层的综合性能。
Description
技术领域
本发明属于表面涂层的制备技术领域,具体涉及一种基于耐高温合金基体表面的自愈合梯度热障涂层的制备方法。
背景技术
热障涂层(TBCs)是一种重要的热防护系统,为航空发动机、燃气涡轮机、先进火箭发动机等工业汽轮机表面建立一道保护屏障。但是由于工艺的局限性,热障涂层在高温工作下产生不同程度的气孔、梯度裂纹等缺陷。因此,亟需制备一种适用于高温合金基体的裂纹梯度自愈合涂层,以实现裂纹梯度愈合效应,并阻滞裂纹的进一步扩展。目前,先进的TBCs通常是在镍基或钴基高温合金基体表面制备的。
等离子喷涂工艺作为一种可靠的表面防护技术,通过在易损构件表面上制备功能涂层,可在保持材料原始力学性能的同时,显著提升构件的目标性能。此外,等离子喷涂工艺还具有基材尺寸效应限制小、涂层材料选择范围广及涂层制备效率高等诸多优势特征。等离子喷涂工艺作为一种制备耐磨、耐蚀及热防护涂层的核心技术手段,广泛应用于油气储运、航空飞行、航天工程及军工等领域,特别是航空领域中的高热负荷件。
激光重熔是用激光束将表面熔化而不加任何金属元素,以达到改善表面组织的目的。其主要特点如下:
(1)表面熔化时一般不添加任何合金元素,熔凝层与材料基体是天然的冶金结合。
(2)形成的柱状晶结构和垂直裂纹可提高涂层的应变容限能力,从而显著提高涂层的综合性能。
(3)在激光熔凝过程中,可以排除杂质和气体,同时急冷重结晶获得的组织有较高的硬度、耐磨性和抗蚀性。
(4)其熔层薄,热作用区小,对表面粗糙度和工件尺寸影响不大,甚至可以直接使用。
氧化钇稳定的氧化锆(YSZ)目前仍是最常用的TBC材料,由于其无与伦比的性能,如低导热系数、高熔点、热稳定性、高热膨胀系数和高断裂韧性等性能,尽管YSZ材料存在高温相变和具有极限使用温度(1200℃)等缺点,但迄今为止仍然没有一个单一材料的综合性能可以超过它,YSZ仍然是使用最广泛、最经典的热障涂层材料。
TiAl3是常用到的自愈合材料,高温下与O2发生氧化反应,使得Al元素在高温条件下与O结合的氧化物修复裂纹存在可能性,因此Al元素能扩散到基体中就可以实现涂层自愈合修复。已有研究表明Al元素在涂层中可向基体扩散,离基体表面距离越远扩散系数越低,越难扩散到基体中。因此梯度的TiAl3浓度可实现Al元素持续的向基体供给。
发明内容
针对目前热障涂层自愈合性能不佳,涂层存在高温剥落的问题,本发明提出一种自愈合梯度热障涂层的制备方法。
本发明的技术方案如下:
一种自愈合梯度热障涂层的制备方法,包括如下步骤:
(1)对高温合金基体进行清洗和喷砂处理,然后采用超音速火焰喷涂制备结合层;
所述高温合金基体包括但不限于镍基合金、铬基合金、镍铬合金;经过喷砂处理后,得到Ra 8~10的粗糙度;
所述超音速火焰喷涂的工艺参数如下:氧气压力0.6MPa、氧气流量16m3/h、丙烷压力0.35MPa、送粉速率25g/min、喷涂距离120mm、喷涂速度180mm/s;
所述结合层包括但不限于NiCrAlY、NiAl;
(2)采用大气等离子喷涂(APS)将自愈合粉末喷涂在结合层上,制备自愈合梯度热障涂层;
所述大气等离子喷涂的工艺参数如下:电压55V、电流650A、主气流Ar 36I/min、二次气流H2 3I/min、送粉速率30g/min、喷涂距离80mm、喷涂速度400mm/s;
所述自愈合粉末由TiAl3和YSZ(氧化钇稳定的氧化锆)混合而成;所述YSZ中,Y2O3的质量分数为6~8%,余量为ZrO2;
优选制备的自愈合梯度热障涂层分为三层,自内而外每一层中TiAl3的质量百分数分别为5~10%、10~15%、15~20%,并且三层中TiAl3的质量百分数各不相同,呈现由外层向内层梯度下降的趋势,三层厚度之比1:1:1;
根据Al元素在热障涂层中的热扩散系数确定,喷涂的第一层粉末的Al元素浓度要比第二层低,第二层比第三层低,以此类推,达到高温耐腐蚀、抗氧化的作用;
(3)将经过步骤(2)处理的试样置于无水乙醇中超声清洗(15min),烘干,然后利用激光重熔工艺在自愈合梯度热障涂层表面制备激光改性区(以提高涂层的应变容限能力),完成后处理;
所述激光重熔工艺的参数如下:激光功率500W、光斑直径1.5mm、扫描速度15mm/s;
通过采用激光重熔工艺,使涂层结构致密、减少或消除原有喷涂态涂层中的气孔等缺陷,使涂层微观组织得到改善。
本发明的有益效果在于:
本发明提出的一种自愈合梯度热障涂层的制备方法,以TiAl3为自愈合剂,以YSZ为陶瓷材料,采用NiCrAlY作为结合层,结合等离子喷涂工艺制备出致密、耐热耐腐蚀、结合性能良好的自愈合梯度涂层。原料中的TiAl3作为自愈合剂,可一定程度上减少涂层开裂及孔洞;Al元素高温热扩散,可在基体中形成氧化物改善涂层缺陷;等离子喷涂形成具有典型层状结构并伴有孔隙的陶瓷涂层,改善工艺参数可以保证涂层的完整性。
本发明提出的一种自愈合梯度热障涂层制备方法,主要优点是:等离子喷涂制备的涂层耐高温性能优异,对基体加热少,零件不变形,可延长基体的使用寿命,且工艺过程简单稳定,涂层质量高。本发明采用TiAl3为自愈合剂,充分利用自愈合材料在高温下发生氧化反应,产生的氧化物填补涂层中的气孔、裂纹等缺陷,实现裂纹梯度愈合效应,并阻滞裂纹的进一步扩展;同时激光改性区形成的柱状晶结构和垂直裂纹可提高涂层的应变容限能力,从而显著提高涂层的综合性能。
附图说明
图1:自愈合梯度涂层的示意图。
图2:等离子喷涂TiAl3+YSZ自愈合梯度涂层的截面形貌。
图3:激光重熔TiAl3+YSZ自愈合梯度涂层的截面形貌。
图4:激光重熔TiAl3+YSZ自愈合梯度涂层在1000℃保温10h后的截面形貌。
具体实施方式
下面通过具体实施例进一步描述本发明,但本发明的保护范围并不仅限于此。
实施例1
步骤一:将镍基合金基底依次放在丙酮、酒精、蒸馏水中各超声清洗十分钟,在常温下进行干燥,然后对其表面进行喷砂处理;
步骤二:将处理好的基体置于夹具中固定,放置在工作台上,采用超音速火焰喷涂方法在镍基合金表面制备涂层结合层;
所述超音速火焰喷涂的工艺参数如下:氧气压力0.6MPa、氧气流量16m3/h、丙烷压力0.35MPa、送粉速率25g/min、喷涂距离120mm、喷涂速度180mm/s;
所述结合层为NiCrAlY;
步骤三:本实施例自愈合梯度陶瓷涂层材料由下至上依次由以下质量分数比的成分组成:5%TiAl3+95%YSZ,10%TiAl3+90%YSZ和15%TiAl3+85%YSZ。采用大气等离子喷涂方法在结合层上制备自愈合梯度陶瓷涂层,涂层厚度为1:1:1;
所述大气等离子喷涂的工艺参数如下:电压55V、电流650A、主气流Ar 36I/min、二次气流H2 3I/min、送粉速率30g/min、喷涂距离80mm、喷涂速度400mm/s。
本实施例制备的自愈合梯度涂层的结合层厚度为100μm、自愈合梯度陶瓷层总厚度为300μm,如图2所示,等离子喷涂自愈合梯度陶瓷层存在明显的气孔、空隙和微裂纹等缺陷。
对自愈合梯度陶瓷层进行激光重熔改性后,涂层结构致密均匀,并产生了柱状晶结构和垂直裂纹,如图3所示。激光重熔工艺的参数如下:激光功率500W、光斑直径1.5mm、扫描速度15mm/s。
涂层在1000℃的高温条件下保温10h后如图4所示,涂层裂纹明显愈合,结构更为致密,可证明自愈合梯度热障涂层在高温下能有效修复涂层的气孔、空隙和微裂纹等缺陷。经过高温热处理可证明自愈合YSZ涂层有效阻挡氧扩散的能力比传统YSZ热障涂层提高3倍以上。
实施例2
步骤一:将镍基合金基底依次放在丙酮、酒精、蒸馏水中各超声清洗约十分钟,然后在常温下进行干燥,然后对其表面进行喷砂处理;
步骤二:将处理好的基体置于夹具中固定,放置在工作台上,采用超音速火焰喷涂方法在镍基合金表面制备涂层结合层;
所述超音速火焰喷涂的工艺参数与实施例1相同;
所述结合层为NiCrAlY;
步骤三:本实施例自愈合梯度涂层材料由下至上依次由以下质量分数比的成分组成:7%TiAl3+93%YSZ,12%TiAl3+88%YSZ和17%TiAl3+83%YSZ。采用大气等离子喷涂方法在结合层上制备自愈合梯度陶瓷涂层,涂层厚度为1:1:1;
所述大气等离子喷涂的工艺参数与实施例1相同。
本实施例制备自愈合涂层的方法与实施例1方法相同,结合层厚度为100μm,自愈合梯度陶瓷层总厚度为300μm,其中不同之处在于:采用的自愈合剂比例不同。经过激光重熔改性、高温热处理可证明自愈合YSZ涂层有效阻挡氧扩散的能力比传统YSZ热障涂层提高5倍以上。
实施例3
步骤一:将镍基合金基底依次放在丙酮、酒精、蒸馏水中各超声清洗约十分钟,然后在常温下进行干燥,然后对其表面进行喷砂处理;
步骤二:将处理好的基体置于夹具中固定,放置在工作台上,采用超音速火焰喷涂方法在镍基合金表面制备涂层结合层;
所述超音速火焰喷涂的工艺参数与实施例1相同;
所述结合层为NiCrAlY;
步骤三:本实施例自愈合梯度涂层材料由下至上依次由以下质量分数比的成分组成:10%TiAl3+90%YSZ,15%TiAl3+85%YSZ和20%TiAl3+80%YSZ。采用大气等离子喷涂方法在结合层上制备自愈合梯度陶瓷涂层,涂层厚度为1:1:1;
所述大气等离子喷涂的工艺参数与实施例1相同。
本实施例制备自愈合梯度涂层的方法与实施例1方法相同,结合层厚度为100μm,自愈合梯度陶瓷层总厚度为300μm,其中不同之处在于:采用的自愈合剂比例不同。通过截面SEM分析可知,本实施例制备的涂层经过激光重熔改性、高温热处理可证明自愈合YSZ涂层有效阻挡氧扩散的能力比传统YSZ热障涂层提高10倍以上。
Claims (6)
1.一种自愈合梯度热障涂层的制备方法,其特征在于,包括如下步骤:
(1)对高温合金基体进行清洗和喷砂处理,然后采用超音速火焰喷涂制备结合层;
(2)采用大气等离子喷涂将自愈合粉末喷涂在结合层上,制备自愈合梯度热障涂层;
所述自愈合粉末由TiAl3和YSZ混合而成;
所述自愈合梯度热障涂层分为三层,自内而外每一层中TiAl3的质量百分数分别为5~10%、10~15%、15~20%,并且三层中TiAl3的质量百分数各不相同,呈现由外层向内层梯度下降的趋势,三层厚度之比1:1:1;
(3)将经过步骤(2)处理的试样置于无水乙醇中超声清洗,烘干,然后利用激光重熔工艺在自愈合梯度热障涂层表面制备激光改性区,完成后处理。
2.如权利要求1所述自愈合梯度热障涂层的制备方法,其特征在于,步骤(1)中,所述高温合金基体为镍基合金、铬基合金或镍铬合金;经过喷砂处理后,得到Ra 8~10的粗糙度。
3.如权利要求1所述自愈合梯度热障涂层的制备方法,其特征在于,步骤(1)中,所述超音速火焰喷涂的工艺参数如下:氧气压力0.6MPa、氧气流量16m3/h、丙烷压力0.35MPa、送粉速率25g/min、喷涂距离120mm、喷涂速度180mm/s。
4.如权利要求1所述自愈合梯度热障涂层的制备方法,其特征在于,步骤(1)中,所述结合层为NiCrAlY或NiAl。
5.如权利要求1所述自愈合梯度热障涂层的制备方法,其特征在于,步骤(2)中,所述大气等离子喷涂的工艺参数如下:电压55V、电流650A、主气流Ar 36I/min、二次气流H2 3I/min、送粉速率30g/min、喷涂距离80mm、喷涂速度400mm/s。
6.如权利要求1所述自愈合梯度热障涂层的制备方法,其特征在于,步骤(3)中,所述激光重熔工艺的参数如下:激光功率500W、光斑直径1.5mm、扫描速度15mm/s。
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