Thermal Shock Resistance of Plasma Sprayed Al2O3-TiO2/NiCoCrAlY Coatings on Aluminum Substrate
-
摘要: 在ZL104铝合金基体上喷涂了Al2O3-TiO2/NiCoCrAlY系梯度涂层和Al2O3-TiO2非梯度涂层,对这两种试样进行了室温400 ℃冷热循环试验,以研究涂层的抗热震性能和热震失效机制.结果表明:Al2O3-45%TiO2与基体热膨胀系数的差异所产生的热应力是热震过程中涂层剥落的主要原因,涂层成分的梯度变化缓解了热应力,提高了抗热震失效能力;在热震循环过程中试样的弯曲是由基体和涂层材料膨胀系数、导热系数的差异以及铝基体的塑性变形造成的,这种变形使涂层产生残余拉应力,降低了涂层的抗热震性能.
-
关键词:
- 等离子喷涂 /
- 梯度涂层 /
- 热震性能 /
- Al2O3-TiO2涂层
Abstract: Plasma sprayed Al2O3-TiO2/NiCoCrAlY coatings with a gradient distributed composition or non-gradient distributed compositions were prepared on ZL104 aluminum substrate.In order to study the thermal shock resistance and thermal shock failure mechanism of Al2O3-TiO2/NiCoCrAlY coatings,the samples were heated to 400 ℃ and hold a certain time then cooled to room temperature by quenching.The results stcow that the thermal shock resistance of gradient coating is much better than that of non-gradient coatings.The main cause of coating flaking-off is due to the thermal stress caused by different thermal expansion coefficients.The gradient distributed composition would release the stress in some extent and it is also of benefit to thermal-shock resistance of the coatings.After heating and cooling,the samples are bent because of the differences of dilation coefficient and heat conductivity between coating materials and substrates,or the plastic deformation of aluminum substrate.The deformation cause a residual strength stress in the coating and reduced its thermal shock resistance.-
Keywords:
- plasma spraying /
- gradient coating /
- thermal shock resistance /
- Al2O3-TiO2 coating
-
-
[1] 曾苏民.轻量化的首选金属材料是铝[J].铝加工,2002,25(6):1-5. [2] 刘静安,谢水生.铝合金材料的应用与技术开发[J].北京:机械工业出版社,2004. [3] 彭晓东,李玉兰,刘江.轻合金在汽车上的应用[J].机械工程材料,1999,23(2):1-4. [4] 赵文轸,苏勋加,王汉功.铝表面激光熔覆硬质合金层的结合强度[J].兵器材料科学与工程,1997,20(1):41-45. [5] 王引真,孙永兴,何艳玲,等.涂层结构对等离子喷涂陶瓷涂层抗热震性的影响[J].机械工程材料,1999,23(4):29-30. [6] 张罡,武颖娜,梁勇,等.Al2O3对等离子喷涂热障涂层高温氧化及热震性能的影响[J].中国有色金属学报,2002,12(3):409-414. [7] 陈和兴,周克崧,金展鹏.等离子喷涂热障涂层失效机理的研究[J].广东有色金属学报,2002,12(2):116-119. [8] 黄维刚.等离子喷涂ZrO22NiCoCrAlY 梯度热障涂层的抗热震性及失效机理[J].材料热处理学报,2001,22(4):21-23. [9] 郭洪波,宫声凯,徐惠彬.梯度热障涂层的设计[J].航空学报,2002,923(5):467-472. [10] 孙国平,杨向明.改善铸铝基体性能的热喷涂技术[J].铁道机车车辆工人,1997,(5):28-29. [11] Ynch C T.Hand book of materials science[J].Boca Ratton,FL:CRC Press,1997. [12] 斯温 M V.陶瓷结构与性能,第11卷[M].郭景坤译.北京:科学出版社,1986. [13] 邓世均.高性能陶瓷涂层[J].北京:化学工业出版社,2004. [14] ZHENG Q X,ZHENG X L,WANG F H.On the expressions of fatigue life of ceramics with given survivability[J].Engineering Fracture Mechanics,1996,53(1):49-55. [15] 吴炳乾.稀土冶金学[J].长沙:中南工业大学出版社,1997.
计量
- 文章访问数: 0
- HTML全文浏览量: 0
- PDF下载量: 0
下载:
