摘要
以YSZ为基体,选择CaF_(2)/Al_(2)O_(3)为复合添加相,利用大气等离子喷涂技术制备了不同配比的YSZ基复合涂层(A组为YSZ+6%CaF_(2)+6%Al_(2)O_(3);B组为YSZ+12%CaF_(2)+12%Al_(2)O_(3)),对涂层在室温~1100℃下的摩擦学性能及润滑机理进行了研究。结果表明,B组涂层因添加相含量较高,其维氏硬度(337HV0.5)低于A组(423HV0.5),但在800℃下摩擦系数显著降低至0.22。分析表明,低温阶段(≤400℃)涂层摩擦行为受机械强度影响较大;而高温阶段(≥600℃)CaF_(2)通过韧脆转变降低剪切强度,协同Al_(2)O_(3)促进氧化物釉质层动态形成,显著改善润滑性能。此外,1100℃下A组涂层因Ca元素扩散及CaZrO_(3)生成形成稳定釉质层,摩擦系数降至0.16,而B组因添加相过量导致涂层失效。
We prepared YSZ-based composite coatings with CaF_(2)/Al_(2)O_(3)as additives using atmospheric plasma spraying(APS).We prepared two groups:Group A(YSZ+6%CaF_(2)+6%Al_(2)O_(3))and Group B(YSZ+12%CaF_(2)+12%Al_(2)O_(3)),and investigated their tribological performance and lubrication mechanisms across a wide temperature range(room temperature-1100℃).Results show that Group B,with higher additive content,exhibited lower room-temperature Vickers hardness(337HV0.5)than Group A(423HV0.5),but achieved a significantly reduced friction coefficient of 0.22 at 800℃.At low temperatures(≤400℃),mechanical strength dominated friction behavior,while at high temperatures(≥600℃),CaF_(2)actively reduced shear strength through ductile-to-brittle transition,synergizing with Al_(2)O_(3)to dynamically form oxide glaze layers that enhanced lubrication.At 1100℃,Group A developed a stable glaze layer via Ca diffusion and CaZrO_(3) formation,lowering the friction coefficient to 0.16,whereas Group B failed due to excessive additive content.
作者
李晶
曾元松
刘洪歌
靖建农
崔向中
崔秀芳
金国
LI Jing;ZENG Yuansong;LIU Hongge;JING Jiannong;CUI Xiangzhong;CUI Xiufang;JIN Guo(Aviation Key Laboratory of Science and Technology on Advanced Surface Engineering,AVIC Manufacturing,Technology Institute Beijing 100024,China;Science and Technology on Power Beam Processes Laboratory,AVIC Manufacturing Technology Institute,Beijing 100024,China;College of Materials Science and Chemical Engineering,Harbin Engineering University,Harbin 150006,China)
出处
《航空制造技术》
北大核心
2026年第5期140-149,共10页
Aeronautical Manufacturing Technology
基金
国家科技重大专项(J2022-VI-0007-0038)。
