摘要
为了使航天发动机中镍合金在高温,高压,富氧条件下安全高效地工作,以镍粉及玻璃相为原料制成料浆,采用流涂法在航天发动机用镍基合金GH4586表面制备高温含镍的B_2O_3-A1_2O_3-BaO-CeO_2-ZrO_2(Ni/BACZ)金属陶瓷涂层。通过扫描电镜和X射线衍射分析涂层的表面和截面组织形貌以及相组成,采用拉伸实验、氧化试验和热震实验分析涂层性能。结果表明:Ni/BACZ涂层结构致密,主要物相为Ni、Al_2O_3和CeBO_3。涂层与基体结合牢固,结合强度大于55MPa。900℃氧化条件下,涂层的抗氧化性能相比无涂层基体提高7倍以上。Ni可减少涂层高温热应力产生的裂纹,增加涂层韧性,使其具有良好的抗热震性能。
In order to make the nickel alloy used in aerospace engine work safely and efficiently under the conditions of high temperature,high pressure and oxygen enrichment.A new Ni/cermet coating containing B2O3-A12O3-BaO-CeO2-ZrO2(Ni/BACZ)were prepared on GH4586 nickel-based alloy by slurry method.The surface and cross section morphologies and the phase composition of the coating were analyzed by SEM and XRD respectively.The properties of coating were analyzed by the stretching test,oxidation test and thermal shock experiment.The results show that the structure of Ni/BACZ coating is compact and solid with the matrix,and the main phases are Ni,Al2O3 and CeBO3.The coating is firmly combined with the matrix,and the tensile strength is more than 55 MPa.Furthermore,the oxidation resistance of GH4586 nickel-base alloy with cermet coating is improved 7 times than that of the uncoated alloy at 900℃.Ni can reduce the coating cracks produced by the high temperature thermal stress,improve the toughness of the coating so that it has a great thermal shock resistance.
作者
高波
曾凡浩
古一
李漪
GAO Bo;ZENG Fanhao;GU Yi;LI Yi(The State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China;The National Key Laboratory of Science and Technology on High-Strength Lightweight Structural Materials,Changsha 410083,China;School of Materials Science and Engineering,Central South University,Changsha 410083,China)
出处
《粉末冶金材料科学与工程》
EI
北大核心
2018年第5期527-533,共7页
Materials Science and Engineering of Powder Metallurgy
基金
湖南省自然科学基金资助项目(2018JJ2507)
关键词
GH4586材料
金属陶瓷涂层
结合强度
抗氧化
抗热震
GH4586 material
metal cermet coating
bonding strength
anti-oxidation
thermal shock resistance
