高能等离子喷涂垂直裂纹氧化锆热障涂层工艺及结合性能研究  

Process and bonding performance of ZrO_(2)thermal barrier coatings with vertical cracks by high energy plasma spraying

作　　者：刘保侠 张盟 周绪强 牛云松 黄迪[3] 杨沁乾 鲍泽斌 朱圣龙[3] Liu Baoxia;Zhang Meng;Zhou Xuqiang;Niu Yunsong;Huang Di;Yang Qinqian;Bao Zebin;Zhu Shenglong(PipeChina North Pipeline Co.,Ltd.,Langfang 065000,Hebei,China;不详)

机构地区：[1]国家管网集团北方管道有限责任公司,河北廊坊065000 [2]北京科技大学新金属材料国家重点实验室,北京100083 [3]中国科学院金属研究所师昌绪先进材料创新中心,辽宁沈阳110016

出　　处：《耐火材料》2024年第4期284-289,共6页Refractories

基　　金：国家自然科学青年基金资助项目(51701223)。

摘　　要：为延长氧化钇稳定氧化锆热障涂层的使用寿命,通过高能等离子喷涂设备,以HS188合金为基体,NiCrAlY粉(打底层,d_(50)=106μm)和氧化钇稳定的氧化锆粉(YSZ,d_(50)=50μm)为喷涂料,采用递进式的探索方法,通过调整枪基距(85、95、105和115 mm)和冷却方式(后风冷、后风冷+枪冷、前风冷、前风冷+枪冷)来控制涂层的组织结构,并采用拉拔法评价NiCrAlY+YSZ涂层的结合强度。结果表明:在枪基距较远以及冷却速率较低的情况下,因试样表面瞬热温度较低和激冷不足,涂层难以形成垂直裂纹结构。然而,在瞬热温度达到要求,风冷速率过度的情况下,会出现喷涂颗粒未熔的现象。当枪基距为85 mm,冷却方式为前风冷时,在HS188合金上获得了垂直裂纹形貌的热障陶瓷涂层,同时涂层的垂直裂纹密度适中,结合强度最高,韧性也最好。In order to prolong the service life of ZrO_(2)thermal barrier coatings,HS188 alloy was used as the substrate,and NiCrAlY powder(base layer,d_(50)=106μm)and yttria stabilized zirconia(YSZ,d_(50)=50μm)were employed as sprayed feeder to prepare NiCrAlY+YSZ thermal barrier coatings using high-energy plasma spraying equipment with a progressive exploration method.The microstructure of the coatings was controlled by adjusting the stand-off distance(85,95,105 and 115 mm)and air-cooling manner(rear air cooling,rear air cooling+gun cooling,front air cooling,and front air cooling+gun cooling).The bonding strength of the coatings was evaluated by the drawing method.The results indicate that under the conditions of long stand-off distance and low cooling rate,it is difficult for the coatings to form a vertical crack structure due to the low instantaneous heating temperature and insufficient quenching on the sample surface.However,when the instantaneous heating temperature reaches the critical value and the air cooling rate is excessive,un-melted spray particles exist.When the stand-off distance is 85 mm and the cooling method is front air cooling,a thermal barrier ceramic coating with vertical crack morphology was obtained on HS188 alloy.Simultaneously,it has a moderate density of vertical cracks,the highest bonding strength and the best toughness.

关 键 词：高能等离子喷涂 热障涂层 NICRALY 氧化锆 风冷 枪基距 

分 类 号：TG174.442[金属学及工艺—金属表面处理]