When immersed in sand and dust environment,aero-engine blades are exposed to harsh erosion which may lead to failure if erosion is severe.Using Physical Vapor Deposition(PVD)to prepare hard ceramic coatings can greatl...When immersed in sand and dust environment,aero-engine blades are exposed to harsh erosion which may lead to failure if erosion is severe.Using Physical Vapor Deposition(PVD)to prepare hard ceramic coatings can greatly enhance the operational capabilities of aero-engine.However,due to the“line-of-sight”processing characteristic of PVD process,uneven coating deposition rates occur when preparing coatings on obstructed areas such as blisks.Quantitative research on such phenomena is few,and it is even rarer in the study of aero-engine coatings.Based on the analyses and considerations of the geometric shape of blade surfaces and the influence of both deposition and re-sputtering effect,an ideal model is established to analyze the deposition rate variation along blocked region in complex self-shadowing boundaries.The relative deposition rates at various locations on the blade surface within the inter-blade gaps are quantitatively calculated and experimentally validated.Furthermore,differences in erosion resistance of the coatings are tested.The conclusions are drawn as follows:the geometric configuration of the obstructed shape and resputtering phenomenon significantly influence the deposition rates within the inner wall of blade gaps.Taking the structural configuration as an example,in a 25 mm×60 mm×15 mm gap,the coating thickness can vary more than 252%from the thickest to the thinnest location.The deposition rates of various locations are proportional to the solid angle of incident ion in more obstructed regions,and the re-sputtering is more prominent in open regions.Obstructive boundaries directly affect the erosion resistance at various locations within the gaps,with erosion failure time decreasing by 40%in heavily blocked region compared to open region.展开更多
采用电子束物理气相沉积 ( EB- PVD)方法在 DZ2 2合金基体上沉积制得了由 Ni Co Cr Al Y粘结层和 YSZ( Yt-tria Stabilized Zirconia)陶瓷顶层组成的双层结构的热障涂层。研究了 Ni Co Cr Al Y粘结层表面的喷丸强化处理对热障涂层的抗...采用电子束物理气相沉积 ( EB- PVD)方法在 DZ2 2合金基体上沉积制得了由 Ni Co Cr Al Y粘结层和 YSZ( Yt-tria Stabilized Zirconia)陶瓷顶层组成的双层结构的热障涂层。研究了 Ni Co Cr Al Y粘结层表面的喷丸强化处理对热障涂层的抗氧化性能的影响 ,利用 MTS测试了经等温氧化不同时间后的热障涂层内部的结合强度 ,并采用 SEM和XRD观察和分析了涂层的界面结合以及相组成。结果表明 ,等温氧化后热障涂层内部的结合强度急剧降低 ,在拉伸和剪切应力作用下 ,涂层沿着 TGO ( Thermally Grown Oxide)层内部断裂失效 ,强度为 0 .3 MPa的表面喷丸处理能显著提高热障涂层的抗氧化性能和涂层内部 TGO层的结合强度。展开更多
采用PVD陶瓷覆膜工艺对控压钻井节流阀阀芯表面处理,通过实验对比研究不同表面覆膜处理的阀芯耐冲蚀性能。结果表明,经过冲蚀后,Ti Al N涂层材料阀芯的质量损失约为Ti N涂层材料的1/3,Ti Al N涂层材料阀芯冲蚀最严重处表面轮廓损失约为T...采用PVD陶瓷覆膜工艺对控压钻井节流阀阀芯表面处理,通过实验对比研究不同表面覆膜处理的阀芯耐冲蚀性能。结果表明,经过冲蚀后,Ti Al N涂层材料阀芯的质量损失约为Ti N涂层材料的1/3,Ti Al N涂层材料阀芯冲蚀最严重处表面轮廓损失约为Ti N涂层材料的1/2,Ti Al N涂层材料在提升控压钻井节流阀耐冲蚀性能和使用可靠性上较Ti N涂层材料优越。展开更多
提出kinetic Monte Carlo模拟物理气相沉积(physical vapor deposition,简写为PVD)薄膜生长的新算法:用红黑树搜索实现跃迁路径选择及系统跃迁概率更新,通过比较红黑树搜索、线性查找、满二元树搜索的计算效率,综合分析了这3种方法的时...提出kinetic Monte Carlo模拟物理气相沉积(physical vapor deposition,简写为PVD)薄膜生长的新算法:用红黑树搜索实现跃迁路径选择及系统跃迁概率更新,通过比较红黑树搜索、线性查找、满二元树搜索的计算效率,综合分析了这3种方法的时间复杂度和空间复杂度。结果表明红黑树搜索优于其它两种搜索方法,模拟效率最高,更适合用于执行大系统的kinetic Monte Carlo模拟。展开更多
采用物理气相沉积(Physical vapor deposition,PVD)工艺在氮化硅陶瓷刀具表面分别沉积Ti Al N和Ti Al Si N涂层。采用扫描电子显微镜(SEM)研究Ti Al N和Ti Al Si N涂层表面形貌和微观结构,X射线衍射仪(XRD)研究涂层晶体结构,显微硬度计...采用物理气相沉积(Physical vapor deposition,PVD)工艺在氮化硅陶瓷刀具表面分别沉积Ti Al N和Ti Al Si N涂层。采用扫描电子显微镜(SEM)研究Ti Al N和Ti Al Si N涂层表面形貌和微观结构,X射线衍射仪(XRD)研究涂层晶体结构,显微硬度计表征涂层硬度。采用Ti Al N和Ti Al Si N涂层氮化硅刀具对灰铸铁进行连续干切削试验,分别研究Ti Al N和Ti Al Si N涂层对刀具寿命、磨损性能的影响,并探讨涂层刀具磨损机理。实验结果表明:Ti Al Si N涂层晶粒比Ti Al N涂层细小,从而具有更高的表面硬度。Ti Al N涂层可将氮化硅陶瓷刀具寿命提高50%左右,Ti Al Si N涂层可将刀具寿命提高1倍。切削过程中,Ti Al N涂层刀具在磨损初期的主要磨损机理是磨粒磨损和少量粘结磨损,而后转为严重的粘结磨损;而Ti Al Si N涂层刀具主要的磨损机制为磨粒磨损和粘结磨损。展开更多
基金financially supported by the Shaanxi Provincial Science and Technology Innovation Team,China(No.2024RS-CXTD-26)。
文摘When immersed in sand and dust environment,aero-engine blades are exposed to harsh erosion which may lead to failure if erosion is severe.Using Physical Vapor Deposition(PVD)to prepare hard ceramic coatings can greatly enhance the operational capabilities of aero-engine.However,due to the“line-of-sight”processing characteristic of PVD process,uneven coating deposition rates occur when preparing coatings on obstructed areas such as blisks.Quantitative research on such phenomena is few,and it is even rarer in the study of aero-engine coatings.Based on the analyses and considerations of the geometric shape of blade surfaces and the influence of both deposition and re-sputtering effect,an ideal model is established to analyze the deposition rate variation along blocked region in complex self-shadowing boundaries.The relative deposition rates at various locations on the blade surface within the inter-blade gaps are quantitatively calculated and experimentally validated.Furthermore,differences in erosion resistance of the coatings are tested.The conclusions are drawn as follows:the geometric configuration of the obstructed shape and resputtering phenomenon significantly influence the deposition rates within the inner wall of blade gaps.Taking the structural configuration as an example,in a 25 mm×60 mm×15 mm gap,the coating thickness can vary more than 252%from the thickest to the thinnest location.The deposition rates of various locations are proportional to the solid angle of incident ion in more obstructed regions,and the re-sputtering is more prominent in open regions.Obstructive boundaries directly affect the erosion resistance at various locations within the gaps,with erosion failure time decreasing by 40%in heavily blocked region compared to open region.
文摘采用PVD陶瓷覆膜工艺对控压钻井节流阀阀芯表面处理,通过实验对比研究不同表面覆膜处理的阀芯耐冲蚀性能。结果表明,经过冲蚀后,Ti Al N涂层材料阀芯的质量损失约为Ti N涂层材料的1/3,Ti Al N涂层材料阀芯冲蚀最严重处表面轮廓损失约为Ti N涂层材料的1/2,Ti Al N涂层材料在提升控压钻井节流阀耐冲蚀性能和使用可靠性上较Ti N涂层材料优越。
文摘提出kinetic Monte Carlo模拟物理气相沉积(physical vapor deposition,简写为PVD)薄膜生长的新算法:用红黑树搜索实现跃迁路径选择及系统跃迁概率更新,通过比较红黑树搜索、线性查找、满二元树搜索的计算效率,综合分析了这3种方法的时间复杂度和空间复杂度。结果表明红黑树搜索优于其它两种搜索方法,模拟效率最高,更适合用于执行大系统的kinetic Monte Carlo模拟。
文摘采用物理气相沉积(Physical vapor deposition,PVD)工艺在氮化硅陶瓷刀具表面分别沉积Ti Al N和Ti Al Si N涂层。采用扫描电子显微镜(SEM)研究Ti Al N和Ti Al Si N涂层表面形貌和微观结构,X射线衍射仪(XRD)研究涂层晶体结构,显微硬度计表征涂层硬度。采用Ti Al N和Ti Al Si N涂层氮化硅刀具对灰铸铁进行连续干切削试验,分别研究Ti Al N和Ti Al Si N涂层对刀具寿命、磨损性能的影响,并探讨涂层刀具磨损机理。实验结果表明:Ti Al Si N涂层晶粒比Ti Al N涂层细小,从而具有更高的表面硬度。Ti Al N涂层可将氮化硅陶瓷刀具寿命提高50%左右,Ti Al Si N涂层可将刀具寿命提高1倍。切削过程中,Ti Al N涂层刀具在磨损初期的主要磨损机理是磨粒磨损和少量粘结磨损,而后转为严重的粘结磨损;而Ti Al Si N涂层刀具主要的磨损机制为磨粒磨损和粘结磨损。
