高温氧化对不同厚度NiCrAlY-Cr涂层物相影响规律研究  

Study on the Effect of High-Temperature Oxidation on the Phases of NiCrAlY-Cr Coatings with Different Thicknesses

作　　者：陈皎 柴艳 王建锋 张耀[3] 曹正 方子文 张兆路 王园园 何妮 CHEN Jiao;CHAI Yan;WANG Jianfeng;ZHANG Yao;CAO Zheng;FANG Ziwen;ZHANG Zhaolu;WANG Yuanyuan;HE Ni(China Aerospace Science and Industry Corporation Power Co.,Ltd.,Xi’an 710016,China;School of Materials Science and Engineering,Xi’an Jiaotong University,Xi'an 710049,China;School of Mechanical Engineering,Xi’an Jiaotong University,Xi'an 710049,China;College of Aeronautical Engineering,Air Force Engineering University,Xi’an 710038,China)

机构地区：[1]中国航发动力股份有限公司,陕西西安710016 [2]西安交通大学材料科学与工程学院,陕西西安710049 [3]西安交通大学机械工程学院,陕西西安710049 [4]空军工程大学航空工程学院,陕西西安710038

出　　处：《材料保护》2025年第3期106-120,共15页Materials Protection

基　　金：中国航空发动机集团有限公司自主创新专项资金(ZZCX-2022-038)。

摘　　要：为了明确Cr扩散阻挡层对NiCrAlY涂层在高温环境下的氧化性能影响机制,利用等离子喷涂技术制备了NiCrAlY涂层和具有不同设计厚度(50、100、150μm)Cr阻挡层的NiCrAlY-Cr复合涂层。采用X射线衍射仪分析涂层的物相组成变化,采用扫描电子显微镜对涂层微观形貌进行分析,并通过SEM自带的EDS对涂层及氧化层中的元素分布进行分析。研究了不同厚度Cr阻挡层存在时,NiCrAlY-Cr涂层的高温氧化规律。结果表明:沉积态NiCrAlY和NiCrAlY-Cr涂层主要由Ni_3Al组成;850℃下氧化30 h后NiCrAlY和NiCrAlY-Cr涂层表面均形成了α-Al_(2)O_(3)、Cr_2O_(3);当氧化温度升高至950℃时,氧化30 h后,3种具有不同厚度Cr阻挡层的NiCrAlY-Cr复合涂层表面仍以Ni_(3)Al为主,除形成α-Al_(2)O_(3)、Cr_2O_(3)之外,同时出现了属于NiCr_(2)O_(4)的特征衍射峰。在850℃氧化65 h后,NiCrAlY和具有不同厚度Cr阻挡层的NiCrAlY-Cr复合涂层的物相主要以α-Al_(2)O_(3)、Cr_2O_(3)、NiCr_(2)O_(4)、Ni_(3)Al为主。随着氧化时间延长至100 h,氧化850℃和950℃后,NiCrAlY和具有不同厚度Cr阻挡层的NiCrAlY-Cr复合涂层的物相仍以α-Al_(2)O_(3)、Cr_2O_(3)、NiCr_(2)O_(4)、Ni_(3)Al为主。在高温环境下NiCrAlY-Cr涂层表面由α-Al_(2)O_(3)、Cr_(2)O_(3)、NiCr_(2)O_(4)构成的致密保护层使得其相较NiCrAlY涂层具备更加优异的抗高温氧化性能。In order to clarify the influence mechanism of Cr diffusion barrier layer on the oxidation performance of NiCrAlY coating under high temperature conditions,NiCrAlY coatings and NiCrAlY-Cr composite coatings with Cr barrier layers of different design thicknesses(50,100,150μm)were prepared using plasma spraying technology.The phase composition changes of the coatings were analyzed using X-ray diffraction(XRD),while the microstructure of the coatings was examined using scanning electron microscopy(SEM).The element distribution in the coatings and oxidation layers was analyzed by energy dispersive spectrometer(EDS)attached to the SEM.The high-temperature oxidation behavior of NiCrAlY-Cr coatings with different thicknesses of Cr barrier layers was investigated.Results showed that both the deposited NiCrAlY and NiCrAlY-Cr coatings were mainly composed of Ni_(3)Al.After oxidation at 850℃for 30 h,both NiCrAlY and NiCrAlY-Cr coatings formed α-Al_(2)O_(3)and Cr_2O_(3)on their surfaces.When the oxidation temperature was increased to 950℃,after 30 h of oxidation,all three NiCrAlY-Cr composite coatings with different Cr barrier layer thicknesses showed a dominant Ni3Al phase on their surfaces,along with the formation ofα-Al_(2)O_(3),Cr_2O_(3),and characteristic diffraction peaks of NiCr_(2)O_(4).After 65 h of oxidation at 850℃,the main phases in NiCrAlY and NiCrAlY-Cr composite coatings with different thicknesses of Cr barrier layers wereα-Al_(2)O_(3),Cr_2O_(3),NiCr_(2)O_(4)and Ni_(3)Al.With the extension of oxidation time to 100 h,the phases in the NiCrAlY coatings and NiCrAlY-Cr composite coatings with Cr barrier layers of different design thicknesses re-mained dominated by α-Al_(2)O_(3),Cr_2O_(3),NiCr_(2)O_(4)and Ni_(3)Al after oxidation at both 850℃ and 950℃.The dense protective layer formed by α-Al_(2)O_(3),Cr_2O_(3)and NiCr_(2)O_(4)on the surface of NiCrAlY-Cr coatings in high-temperature environments provided significantly better high-temper-ature oxidation resistance compared to NiCrAlY coatings.

关 键 词：等离子喷涂 NiCrAlY-Cr 阻挡层 高温氧化 

分 类 号：TG174[金属学及工艺—金属表面处理]