发动机用AlSi/BN、CuAl/NiCg封严涂层可磨耗性研究

利用高温高速可磨耗试验机,模拟发动机典型工况,进行了AlSi/BN、CuAl/NiCg封严涂层与TC4模拟叶片配副的可磨耗性验,分析了刮削磨耗试验后涂层和叶片的宏观形貌、涂层刮削深度、叶片磨损高度和总磨耗深度。结果表明:AlSi/BN涂层在不同进给速率下的刮削深度均远大于TC4叶片的磨损高度,涂层和叶片磨耗表面有凹槽,磨耗时有"积屑瘤"产生。CuAl/NiCg涂层在不同进给速率下的TC4叶片磨损高度为涂层刮削深度的2~4倍,涂层磨耗表面整体平整,局部有轻微剥落,磨耗时未产生"积屑瘤"。     

进给速率对AlSi/hBN封严涂层可磨耗性的影响

采用模拟工况的试验方法,利用高温超高速可磨耗试验机,研究了进给速率变化对AlSi/hBN封严涂层—TC4模拟叶片的磨耗行为及刮削性的影响,利用体视显微镜、扫描电子显微镜(SEM)分析了涂层和叶片的宏微观形貌;利用能谱仪(EDS)、X射线衍射分析涂层的相成分,结果表明:在温度为450℃,线速度为300m/s,进给深度500μm情况下,进给速率的改变对AlSi/hBN封严涂层—TC4模拟叶片的宏微观形貌和磨耗机制影响显著,低进给速率时,磨损严重,主要表现为切槽、叶片粘附转移和过热等机制;在中高进给速率时,可磨耗性较好,主要表现为切削和涂层材料向叶片的转移机制。     

NiCrFeAl-BN涂层和NiCrFeAl-B.e涂层对磨TC11合金可磨耗性能研究

采用等离子制备NiCoCrAlY底层和YSZ中间层,火焰喷涂制备镍基氮化硼（NiCrFeAl-BN）和镍基膨润土（NiCrFeAl-B.e）面层可磨耗封严涂层。在高温超高速可磨耗试验机上进行涂层与TC11模拟叶片对磨,设置室温和600℃,不同进给速率条件,对两种涂层进行可磨耗性能评价。研究结果表明：进给速率对两种涂层刮削后微观形貌影响较大,但对封严层厚度影响较小。温度提高,对两种涂层破坏作用都有所增加,可磨耗性能下降。相同工况下NiCrFeAl-BN涂层的可磨耗性均优于NiCrFeAl-B.e涂层,但对磨后的叶片高度磨损比（IDR）值仍较大,在叶片叶尖电镀BN涂层后,进给速率为5μm/s时,IDR由16.05%变为8.04%,起到一定保护叶片的作用。     

机加工对 NiCrAl/SiO2 可磨耗封严涂层性能影响

利用大气等离子喷涂技术制备NiCoCrAl·Y_2O_3粘结底层,火焰喷涂技术制备NiCrAl/SiO2可磨耗封严涂层,研究了机加进刀量和机加线速度对NiCrAl/SiO_2涂层表面形貌、粗糙度和硬度的影响。经机加后,涂层相对平整、存在着明显的球形SiO2颗粒和带有切削碾压痕迹的NiCrAl组织形貌,同时伴有大量孔隙,涂层表面粗糙度大幅度降低,涂层硬度与喷涂态保持一致。当机加进刀量位0.10mm、机加线速度为1170mm/s时,ΔRamax和ΔHR15Ymax最小,分别为1.14μm和4HR15Y,粗糙度和硬度均匀程度最好,是NiCrAl/SiO_2封严涂层合适的机加工参数。     

铜铝聚苯酯封严涂层耐蚀性能和可磨耗性能研究

采用等离子喷涂工艺制备了铜铝聚苯酯封严涂层,完成了 96 h 中性盐雾试验、72 h 酸性大气试验、24 d周期浸润试验以及 450 ℃、线速度 300 m/s、进给速率 5~480 μm/s 的高温高速可磨耗试验,研究了涂层的耐蚀性能和可磨耗性能。结果表明：铜铝聚苯酯封严涂层在 72h 酸性大气腐蚀后,涂层表面光滑平整,未观察到腐蚀产物和点蚀坑;24 d 周期的浸润腐蚀后,涂层颜色未发生明显改变,涂层表面结构完整,未观察到腐蚀产物和点蚀坑;96 h 中性盐雾腐蚀后,涂层表面未观察到腐蚀坑,但涂层表面出现大片褐色斑块;不同进给速率下,叶片进给深度比 IDR 值不大于 9.79 %;检测及分析结果表明,涂层拥有优异的耐腐蚀性能和可磨耗性能。     

铜铝 / 镍石墨封严涂层高温可磨耗性能研究

采用高温高速可磨耗试验机, 在温度为 450 ℃, 刮擦线速度为 350 m/s, 进给速率分别为 10 μm/s、 50 μm/s、 100 μm/s 条件下, 对铜铝 / 镍石墨封严涂层进行了高温高速可磨耗实验; 并利用体式显微镜、 扫描电镜、 能谱对 试样刮擦前后的微宏观形貌进行了分析。 同时, 对试样高温高速磨耗过程中叶尖与涂层之间的作用力和磨损质量 进行了分析。 研究结果表明, 涂层试样经磨削后部分试样表面会出现麻坑, 叶尖表面有涂层转移附着; 涂层粘附 转移现象随着进给速率的增加而减少; 叶尖与涂层之间的最大切向力、 最大径向力、 平均径向力和平均切向力均 随着进给速率的增加而增加, 涂层磨损质量随进给速率的增加而减少。 叶片磨损质量和叶尖磨损比值分析表明, 叶尖与对应的铜铝 / 镍石墨封严涂层构成的体系可磨耗性能匹配性较好。     

进给速率对AlSi/PHB封严涂层可磨耗性的影响

可磨耗封严涂层是应用在航空发动机中从而提升其效率的一种材料.本文采用模拟工况法,利用自主研制的BGRIMM-ATR型高温超高速可磨耗试验机对AlSi/PHB封严涂层进行了不同进给速率下的可磨耗实验,研究进给速率变化对AlSi/PHB封严涂层可磨耗性的影响,利用体式显微镜、扫描电子显微镜(SEM)分析涂层的宏观和微观形貌...     

可磨耗封严涂层的摩擦磨损和抗冲蚀性能

可磨耗封严涂层在航空发动机中应用广泛,本文对Ni／石墨、AlSi／石墨、Ni／h-BN和AlSi／h-BN涂层的摩擦磨损性能和抗冲蚀性能进行了研究。结果表明：非金属相对涂层的摩擦磨损性能起决定性作用,以石墨为造孔填充相的涂层具有低的摩擦系数和优良的摩擦磨损性能。涂层的抗冲蚀性能取决于涂层的金属相,在冲蚀试验中,AlSi／石墨和AlSi／h-BN涂层在比Ni／石墨和Ni／h-BN涂层表现优异。     

可磨耗封严涂层研究现状及发展趋势

介绍了航空发动机可磨耗封严涂层的应用特点,论述了可磨耗封严涂层材料体系的国内外研究发展现状,并重点分析了我国在可磨耗封严涂层制备及应用领域今后需要重点开展的研究方向。     

可磨耗封严涂层评述

可磨耗封严涂层是一种重要的热喷涂涂层,广泛应用于飞机发动机,对提高发动机效率、降低油耗进而提升发动机整体性能具有重要意义.本文介绍了可磨耗封严涂层材料的主要种类及其发展趋势,阐述了可磨耗封严涂层性能评价方法.     

China's Major Non-ferrous Metals Imports & Exports

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Zinc Production by Province in 2014

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80% of Chinese Firms Purchasing Overseas Mines Ended up in the Red

<正>Minmetals Resources acquired the world’s largest copper mine under construction for USD5.85 billion.One after another,listed companies Jien Nickle,China Molybdenum and Chihong Zinc and Germanium raised money to get involved in overseas mining projects…SOEs and private enterprises are engaged in a frenzy of overseas mine purchasing.A reporter with Economic     

Copper Processing Profit Dropped Sharply,Copper Consumption Will Face Impact in the Second Half of the Year

正Judging from China’s copper consumption field,the biggest consumption unit is electric power,which accounts for 47%of total consumption;it is followed by light industry sector,including household electrical appliance,machinery,durable goods and hardware etc,which accounts for 22%of total consumption;followed by transportation field,     

Central Geological Prospecting Fund Newly Added 16.47 Million Tonnes of Bauxite in 2013

正In 2013,the Central Geological Prospecting Fund(CGPF)Project newly discovered 15 ore fields,including 3 large above ore fields,and 5medium sized ore fields.The reporter learned from the recently published"Annual Report of Central Geological Prospecting Fund Project(2013)"that,from 2006 to 2013 the CGPF     

Manufacturers of Copper Tube for Central Air Conditioner Use Face Mounting Pressure in the Final Quarter of the Year

正This year,the investment growth rate of real estate industry continued to slow down,sold area of commercial housing also dropped significantly,which brought huge pressure to the domestic air conditioning manufactures.In the first half of the year,by relying on high growth in national financial expenditure,along with investment in public infrastructure     

Xinjiang Ranks No.1 in Production of Primary Aluminum in China

正Kang Yi,Honorary Chairman of China Nonferrous Metals Industry Association,said recently at the Forum on Development of the Non-ferrous Metals Industry in Central and Western China held in Zhengzhou that,as more and more electrolytic aluminum factories in Xinjiang came into operation,the electrolytic aluminum output of Xinjiang had reached2,275,000 tons in the first 7 months this year,     

Shenhuo Coal Industry and Electricity Power Completed800,000 t/a Aluminum Project in Xinjiang

正"Xinjiang project has been completed according to schedule,but total completion and total start of production are two different concepts,after completion it still needs a gradual process of reaching production target."On the morning of November 3,Shenhuo Coal Industry and Electricity Power told investors the above statement on the investor interaction platform.     

Guangdong Metal Transaction Center has Become the Second Largest Precious Metal Transaction Platform Nationwide

正The reporter learned from Guangdong Province Precious Metal Transaction Center that in 2013the Center maintained healthy development momentum,and had become the second largest precious metal transaction platform in China in terms of market size;currently Guangdong is quickening steps of financial innovation for the Center,aiming to build a transaction center with international core competitiveness.     

Seven Rare Earth Projects Involving Close to 3 Billion Yuan Investment Landed In the HighTech Zone

正On May 22,Baotou Rare Earth Industry Cooperation Consultation MeetingProject Agreement-signing Ceremony was held in Ningbo,nearly 40 enterprises from Ningbo,Guangdong,Hunan,and Shanxi participated in project consultation.After multi-lateral communication,agreements were signed for a total of 7 rare earth projects successfully.