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Effect of Laser Cladding Al Ni TiC Powder on Microstructure and Properties of Aluminum Alloy 被引量:2
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作者 Xiaolin Zhang Kemin Zhang +1 位作者 Jinxin Ma Yu Wang 《Journal of Minerals and Materials Characterization and Engineering》 2017年第1期29-38,共10页
In this paper, Al/Ni/TiC powders were mixed on the surface of A380 aluminum alloy, by selecting appropriate laser parameters;the cladding layer with good adhesion to the substrate was obtained. The microstructure and ... In this paper, Al/Ni/TiC powders were mixed on the surface of A380 aluminum alloy, by selecting appropriate laser parameters;the cladding layer with good adhesion to the substrate was obtained. The microstructure and properties of the cladding layer under different laser parameters were analyzed. The results show that: the phase composition of the cladding layer is mainly composed of TiC, Al, Ni, C and Ti phases. The hardness of the cladding region is up to 173.3 HV, which is about 2.9 times the matrix (–59.1 HV). The corrosion voltage (–1.8 V) of the cladding layer shifted significantly from the corrosion potential (–1.18 V), the corrosion current density increased, the resistance value decreased and the diameter of the capacitor arc decreased;all these phenomena indicate that the corrosion resistance of the cladding layer is decreased. 展开更多
关键词 aluminum alloy laser cladding TIC POWDER Microstructure Corrosion Resistance
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Microstructure of Cu-based Amorphous Composite Coatings on AZ91D Magnesium Alloy by Laser Cladding 被引量:8
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作者 Kaijin Huang Changsheng Xie T.M. Yue 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2009年第4期492-498,共7页
To improve the sliding wear resistance of AZ91D magnesium alloy, Cu-based amorphous composite coatings made of CuaTTi34Zr11Nis and Cu47Ti34Zr11Ni8+20 wt pct SiC powders were fabricated on AZ91D magnesium alloy by las... To improve the sliding wear resistance of AZ91D magnesium alloy, Cu-based amorphous composite coatings made of CuaTTi34Zr11Nis and Cu47Ti34Zr11Ni8+20 wt pct SiC powders were fabricated on AZ91D magnesium alloy by laser cladding, respectively. SEM (scanning electron microscopy), EDS (energy dispersive X-ray spectroscopy), XRD (X-ray diffraction) and TEM (transmission electron microscopy) techniques were employed to study the phases of the coatings. The results show that the coatings mainly consist of amorphous phase and different intermetallic compounds. The reason of formation of amorphous phase and the function of SiC particles were explained in details. 展开更多
关键词 laser cladding Cu-based amorphous composite coating SiC particle AZ91D magnesium alloy
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Microstructure and Wear Behaviour of Laser-Induced Thermite Reaction Al_2O_3 Ceramic Coatings on Pure Aluminum and AA7075 Aluminum Alloy 被引量:5
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作者 黄开金 LIN Xin +1 位作者 XIE Changsheng T M Yue 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2008年第1期89-94,共6页
Wear-resistant laser-induced thermite reaction Al2O3 ceramic coatings can be fabricated on pure Al and AA7075 aluminum alloy by laser cladding (one-step method) and laser cladding followed by laser re-melting (two-... Wear-resistant laser-induced thermite reaction Al2O3 ceramic coatings can be fabricated on pure Al and AA7075 aluminum alloy by laser cladding (one-step method) and laser cladding followed by laser re-melting (two-step method) using mixed powders CuO-Al-SiO2 in order to improve the wear properties of aluminum and aluminum alloy, respectively. The microstructure of the coatings was characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The wear resistance of the coatings was evaluated under dry sliding wear test condition at room temperature. Owing to the presence of hard α-Al2O3 and γ-Al2O3 phases, the coatings exhibited excellent wear resistance. In addition, the wear resistance of the coatings fabricated by two-step method is superior to that of the coatings fabricated by one-step method. 展开更多
关键词 laser cladding thermite reaction aluminum alloy WEAR
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Microstructure and Wear Behaviour of Laser-induced Thermite Reaction Al_2O_3 Ceramic Coating on AA7075 Aluminum Alloy
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作者 Kaijin HUANG Xin LIN +1 位作者 Changsheng XIE T.M. Yue 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2007年第2期201-206,共6页
The microstructure and wear behaviour of the thermite reaction coating produced by the hybrid laser claddingremelting on AA7075 aluminum alloy for the systems of Al-CuO-SiO2, Al-Cr2O3-SiO2, Al-Fe2O3-SiO2, and Al-TiO2-... The microstructure and wear behaviour of the thermite reaction coating produced by the hybrid laser claddingremelting on AA7075 aluminum alloy for the systems of Al-CuO-SiO2, Al-Cr2O3-SiO2, Al-Fe2O3-SiO2, and Al-TiO2-SiO2 were studied. The results of the X-ray diffraction (XRD) analysis show that in all the four reaction coatings, α-Al2O3 and γ-Al2O3 phases were present at the top surface, together with various intermetallic phases, the corresponding reduced metal and Al phase in the fusion zone. Under the dry sliding condition, the wear resistance, in terms of weight loss, of the laser-clad specimens was considerably higher than that of the untreated specimen. The predominant wear mechanism of the former specimens was abrasive wear, while for the latter, it was the adhesive wear that prevailed. 展开更多
关键词 laser cladding Thermite reaction aluminum alloy WEAR
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Fabrication and microstructure of Fe-based amorphous composite coatings by laser cladding 被引量:2
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作者 朱庆军 邹增大 +1 位作者 曲士尧 王新洪 《China Welding》 EI CAS 2008年第1期23-28,共6页
Fe-based amorphous composite coatings were fabricated on AISI 1045 steel by laser cladding. The results of the X- ray diffraction and transmission electron microscopy analyses .show the coating is composed of an amorp... Fe-based amorphous composite coatings were fabricated on AISI 1045 steel by laser cladding. The results of the X- ray diffraction and transmission electron microscopy analyses .show the coating is composed of an amorphous phase in majority and a nanocrystaUine phuse in m,inority. Phase composition of the coating changes along the depth of the coating. The reasonable scanning speed for fabricating an amorphous composite coating is 3 500 mm/min when the laser power is 4 800 W and the laser beam diameter is 2 mm. If the scanning speed is lower than 3 500 mm/min, the intensity of the two main diffraction peaks in X-ray diffraction patterns of the coatings decreases with the scanning speeds increasing. At the same time, a broad halo peak emerges and enlarges. High laser power and fast scanning speed are the essential conditions of amorphization. The coating exhibits high microhardness. 展开更多
关键词 laser cladding composite coating amorphous alloy
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Amorphous structure in a laser clad Ni-Cr-Al coating on Al-Si alloy
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作者 梁工英 苏俊义 +1 位作者 黄俊达 胡仲豪 《中国有色金属学会会刊:英文版》 CSCD 2000年第2期220-223,共4页
A mixing microstructure containing Ni based amorphous structures was observed by TEM in the laser clad zones. As the uniformity of chemical composition and temperature is poor in the laser cladding, the amorphous stru... A mixing microstructure containing Ni based amorphous structures was observed by TEM in the laser clad zones. As the uniformity of chemical composition and temperature is poor in the laser cladding, the amorphous structure with some Ni 3Al crystals coexists in the cladding. The microhardness of the mixing amorphous structure is HV 600~800, which is lower than that of crystal phases in the coating. Differential thermal analysis (DTA) shows that Ni based amorphous structure exhibits a higher initial crystallizing temperature (about 588 ℃), which is slightly higher than that of the eutectic temperature of Al Si alloy. The wear test results indicate that there are some amorphous structures in the laser clad coating, which reduces the peeling of the granular phases from matrix, and improves the wear resistance. 展开更多
关键词 laser surface treatment aluminum alloy amorphous structures
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Wear and corrosion properties of laser cladded Cu_(47)Ti_(34)Zr_(11)Ni_8/SiC amorphous composite coatings on AZ91D magnesium alloy 被引量:4
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作者 黄开金 闫里 +2 位作者 王存山 谢长生 周昌荣 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2010年第7期1351-1355,共5页
To improve the wear and corrosion properties of AZ91D magnesium alloys,Cu-based amorphous composite coatings were fabricated on AZ91D magnesium alloy by laser cladding using mixed powders of Cu47Ti34Zr11Ni8 and SiC.Th... To improve the wear and corrosion properties of AZ91D magnesium alloys,Cu-based amorphous composite coatings were fabricated on AZ91D magnesium alloy by laser cladding using mixed powders of Cu47Ti34Zr11Ni8 and SiC.The wear and corrosion behaviours of the coatings were investigated.The wear resistance of the coatings was evaluated under dry sliding wear condition at room temperature.The corrosion resistance of the coatings was tested in 3.5%(mass fraction) NaCl solution.The coatings exhibit excellent wear resistance due to the recombined action of amorphous phase and different intermetallic compounds.The main wear mechanisms of the coatings and the AZ91D sample are different.The former is abrasive wear and the latter is adhesive wear.The coatings compared with AZ91D magnesium alloy also exhibit good corrosion resistance because of the presence of the amorphous phase in the coatings. 展开更多
关键词 magnesium alloy AZ91D alloy laser cladding WEAR CORROSION amorphous phase
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INVESTIGATIONS ON LASER SHOCK-PROCESSING (LSP) TO IMPROVE FATIGUE LIFE OF SMALL HOLE IN AIRCRAFT STRUCTURES 被引量:1
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作者 Zhang Yongkang(Institute of Acoustics and Lab of Modern Acoustics,Nanjing University, Nanjing, China, 210093)Yu Chengye(Nanjing University of Aeronautics and Astronautics, Nanjing, China, 210016) 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 1997年第1期41-45,共5页
Laser shock-processing (LSP) is of particular advantage for improving fa-tigue behavior of small holes and blind holes. Because there are not good accessibility andpassage, these holes cannot be treated by shot peenin... Laser shock-processing (LSP) is of particular advantage for improving fa-tigue behavior of small holes and blind holes. Because there are not good accessibility andpassage, these holes cannot be treated by shot peening or cold extrusion. The fatigue livesof aircraft aluminum alloy 2024-T62 are increased greatly by means of optimization oflaser shocking parameters. With 95 % confidence, the mean fatigue life of LSP specimensis 4. 35~7, 75 times larger than that of the un-shocked ones. 展开更多
关键词 laser shock-processing(LSP) aircraft structures aluminum alloys fatigue life
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Influence of laser scanning speed on Cu-Zr-Al composite coatings on Mg alloys 被引量:6
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作者 Ya-li Gao Meng Jie Hai-bo Zhang 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2013年第6期568-573,共6页
To improve the surface properties of magnesium alloys, a study was conducted on Cu-Zr-A1 composite coatings on AZ91HP magnesium alloy by laser cladding. The influence of laser scanning speed on the microstructures and... To improve the surface properties of magnesium alloys, a study was conducted on Cu-Zr-A1 composite coatings on AZ91HP magnesium alloy by laser cladding. The influence of laser scanning speed on the microstructures and properties of the coatings was discussed. The coatings consist of amorphous phase, CusZr3, and Cul0ZrT. With the increase of laser scanning speed, the amorphous phase content of the coatings increases and reaches 60.56wt% with the laser scanning speed of 2.0 m/min. Because of the influence of laser scanning speed on the amorphous and crystal phases, the coatings show the maximum elastic modulus, hardness, and wear resistance at the laser scanning speed of 1.0 m/min. At the laser scanning speed of 2.0 m/min, the coatings have the best corrosion resistance. 展开更多
关键词 magnesium alloys composite coatings amorphous laser cladding SPEED
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7075铝合金刚柔耦合结构表面疲劳性能探究
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作者 张继林 王栋梁 易湘斌 《兰州工业学院学报》 2024年第1期23-26,75,共5页
采用激光冲击强化技术改善7075铝合金疲劳性能,能够降低成本、提高效率。以7075铝合金为研究对象,通过对其在不同功率密度下的强化试验,测定其在激光冲击下的表面形貌及残余应力的分布情况,结合其疲劳试验,探究激光强化对材料性能的影... 采用激光冲击强化技术改善7075铝合金疲劳性能,能够降低成本、提高效率。以7075铝合金为研究对象,通过对其在不同功率密度下的强化试验,测定其在激光冲击下的表面形貌及残余应力的分布情况,结合其疲劳试验,探究激光强化对材料性能的影响。结果表明:激光冲击强化使铝合金表面粗糙度增大,并产生残余压应力;当功率密度增加到10.19 GW/cm^(2)时,残余压应力不再增大;激光冲击试样的疲劳寿命比未冲击试样提高了1倍,减小了断裂扩展范围;残余压应力的存在增加了铝合金的裂纹萌生难度,延长了其疲劳寿命。 展开更多
关键词 7075铝合金 柔耦合结构 疲劳性能 粗糙度 激光冲击强化
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铝合金表面激光熔覆钛粉复合材料制备及性能研究
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作者 刘士斌 郑建明 +2 位作者 吴锦华 单玲 张二林 《粘接》 CAS 2024年第4期60-63,共4页
为提高铝合金材料的硬度、耐腐蚀以及耐磨性能,试验通过激光熔覆工艺,在ZL101铝合金表面制备了一种Ti/TiC复合涂层材料,并对其性能进行研究。结果表明,随着TiC粉末含量的增多,材料硬度提高,耐腐蚀和耐磨性能增强。当TiC粉末含量为0%时,... 为提高铝合金材料的硬度、耐腐蚀以及耐磨性能,试验通过激光熔覆工艺,在ZL101铝合金表面制备了一种Ti/TiC复合涂层材料,并对其性能进行研究。结果表明,随着TiC粉末含量的增多,材料硬度提高,耐腐蚀和耐磨性能增强。当TiC粉末含量为0%时,与铝合金基材相比,单独激光熔覆Ti粉的涂层材料的耐腐蚀性降低。以88%Ti粉和12%TiC粉进行激光熔覆,制备的Ti/TiC复合涂层材料具备较好的综合性能,其显微硬度达到685 HV,较铝合金基材提高7倍左右。而电化学腐蚀电流密度为3.549e^(-005)A/cm^(2),比铝合金基材增大一个数量级,耐腐蚀性能较好。平均摩擦系数仅为0.238,比铝合金基材降低52.6%,耐磨性能较好。 展开更多
关键词 铝合金 激光熔覆 TIC 显微硬度 耐磨性能
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7075铝合金表面制备AlSi_(10)Mg涂层
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作者 周明琦 檀卓鸣 +3 位作者 金杰 秦旭东 张召 于涛 《烟台大学学报(自然科学与工程版)》 CAS 2024年第4期464-469,共6页
以AlSi_(10)Mg合金粉末为熔覆材料,在7075铝合金基体上进行单层单道激光熔覆实验,研究激光功率、扫描速率、送粉率对熔覆层成形的影响规律,以阐述稀释率较高和气孔率较低现象产生的原因。结果表明:随着激光功率的增加,熔覆层宽度增大、... 以AlSi_(10)Mg合金粉末为熔覆材料,在7075铝合金基体上进行单层单道激光熔覆实验,研究激光功率、扫描速率、送粉率对熔覆层成形的影响规律,以阐述稀释率较高和气孔率较低现象产生的原因。结果表明:随着激光功率的增加,熔覆层宽度增大、高度减小;当激光功率增加到一定程度后,增加送粉率会使熔覆层的宽度和高度显著增大;而送粉率较低时,扫描速率对熔覆层宽度和高度的影响较小。激光功率较高时,基材和粉末熔合充分,产生的气泡较少;同时,送粉率较低时,熔覆层的高度较低,更利于气泡从熔池中逸出,熔覆层气孔率降低至0.07%。因此,在较高激光功率搭配较低送粉率的工艺下会形成高度较低的熔覆层,整体稀释率较高。此结果为降低铝合金激光熔覆气孔缺陷提供一定的指导意义。 展开更多
关键词 激光熔覆 铝合金 熔覆层成形 稀释率 气孔率
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Mo含量对自熔性铁基合金组织性能的影响 被引量:1
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作者 潘雄飞 王月祥 +2 位作者 梁怡航 高鹏博 王会廷 《安徽工业大学学报(自然科学版)》 CAS 2024年第1期37-45,共9页
为提高镀铝锌板生产机组316L沉没辊的耐高温磨损–腐蚀性能,采用激光熔覆技术在316L基体表面制备Fe60涂层和4种含Mo(质量分数为2.5%,5.0%,7.5%,10.0%)的Fe60复合涂层,对不同涂层的物相、微观组织、力学性能、摩擦性能和腐蚀性能进行表征... 为提高镀铝锌板生产机组316L沉没辊的耐高温磨损–腐蚀性能,采用激光熔覆技术在316L基体表面制备Fe60涂层和4种含Mo(质量分数为2.5%,5.0%,7.5%,10.0%)的Fe60复合涂层,对不同涂层的物相、微观组织、力学性能、摩擦性能和腐蚀性能进行表征,探究Mo含量对Fe60涂层组织和性能的影响。结果表明:含Mo涂层析出硬质相Fe_(9.7)Mo_(0.3),Mo对Fe60涂层晶粒度和组织缺陷均有影响,随Mo含量的增加,涂层晶粒度和组织缺陷数均先减后增,w(Mo)=5.0%涂层晶粒度最小、组织无缺陷;与Fe60涂层相比,含Mo涂层硬度降低,而耐磨性均有提升,随Mo含量的增加,涂层耐磨性能先增后减,w(Mo)=5.0%涂层磨损失重最低;与Fe60涂层相比,含Mo涂层耐高温铝锌液腐蚀性能均有提升,随Mo含量的增加,涂层腐蚀速率下降,但Mo质量分数超过5%时,涂层腐蚀面存在局部断裂,实际耐腐蚀性能下降。 展开更多
关键词 激光熔覆 铁基合金 Mo含量 摩擦磨损性能 铝锌液腐蚀
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La_(2)O_(3)添加量对激光熔覆铁基合金涂层显微组织和耐磨性能的影响
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作者 陈永生 叶洲 郭岩 《机械工程材料》 CAS CSCD 北大核心 2024年第4期63-69,共7页
采用激光熔覆技术在35CrMoV钢表面制备添加La_(2)O_(3)质量分数分别为0,0.7%,1.4%,2.0%的铁基合金熔覆层,研究了La_(2)O_(3)含量对其显微组织、物相组成、显微硬度、耐摩擦磨损性能和抗冲击磨料磨损性能的影响。结果表明:未添加La_(2)O_... 采用激光熔覆技术在35CrMoV钢表面制备添加La_(2)O_(3)质量分数分别为0,0.7%,1.4%,2.0%的铁基合金熔覆层,研究了La_(2)O_(3)含量对其显微组织、物相组成、显微硬度、耐摩擦磨损性能和抗冲击磨料磨损性能的影响。结果表明:未添加La_(2)O_(3)的熔覆层主要物相为FeCr固溶体和少量Cr_(23)C_(6),添加La_(2)O_(3)后熔覆层中还出现了LaNi_(3),当La_(2)O_(3)质量分数为1.4%时熔覆层与基体界面平整,冶金结合良好,组织细小且均匀;随着La_(2)O_(3)质量分数增加,熔覆层显微硬度先增大后减小,耐摩擦磨损性能和抗冲击磨料磨损性能先提高后降低,当La_(2)O_(3)质量分数为1.4%,耐磨性能最好,此时熔覆层的摩擦磨损机制由未添加La_(2)O_(3)时的严重黏着磨损变为轻度犁削磨损,冲击磨料磨损表面的犁沟和凹凸不平消失,表面趋于平整。 展开更多
关键词 激光熔覆 La_(2)O_(3) 铁基合金熔覆层 组织 物相 硬度 摩擦磨损 冲击磨料磨损
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6061铝合金微弧氧化与激光熔覆凹凸棒石复合涂层的耐磨和耐腐蚀性能研究
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作者 冯智 孙俊丽 +3 位作者 白凯元 杨慧云 王泽臻 陆海林 《材料保护》 CAS CSCD 2024年第10期78-86,共9页
为了提高铝合金的使用寿命,以6061铝合金为研究对象,在采用微弧氧化(Micro-Arc Oxidation,MAO)技术制备的陶瓷涂层上,使用激光熔覆技术将凹凸棒土(ATP)熔覆在其表面,从而制备MAO-ATP复合涂层并考察其耐磨和耐腐蚀性能。通过扫描电镜(SEM... 为了提高铝合金的使用寿命,以6061铝合金为研究对象,在采用微弧氧化(Micro-Arc Oxidation,MAO)技术制备的陶瓷涂层上,使用激光熔覆技术将凹凸棒土(ATP)熔覆在其表面,从而制备MAO-ATP复合涂层并考察其耐磨和耐腐蚀性能。通过扫描电镜(SEM)及其自带的能谱仪(EDS)分析了涂层的表面形貌以及元素组成,通过摩擦磨损试验和电化学腐蚀试验等手段,考察了涂层的耐磨性和耐腐蚀性。结果表明:MAO-ATP复合涂层在水润滑条件下的摩擦系数比铝基体的降低了32%,比MAO涂层的降低了21%。通过耐腐蚀试验发现,MAO-ATP复合涂层的腐蚀电位(E_0)比铝基体的提高了0.145 V,比MAO涂层的提高了0.235 V;腐蚀电流密度(J_0)比铝基体的降低了2个数量级,比MAO层的降低了1个数量级,有效提高了铝合金的耐磨性和耐腐蚀性,有望拓展铝合金的应用领域。 展开更多
关键词 微弧氧化(MAO) 6061铝合金 激光熔覆 MAO-ATP复合涂层 耐磨性 耐腐蚀性
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激光熔覆Fe基非晶合金涂层的研究现状
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作者 李纪阳 《湖南有色金属》 CAS 2024年第4期74-79,共6页
近年来,随着激光高速熔覆技术的发展,所制备的Fe基非晶合金表面涂层具有制作工艺简便、玻璃形成能力高等特点,且该合金涂层具有优越的力学性能和耐腐蚀性能。本文旨在研究国内外激光熔覆Fe基非晶合金涂层最新的研究进展。总结了最新的... 近年来,随着激光高速熔覆技术的发展,所制备的Fe基非晶合金表面涂层具有制作工艺简便、玻璃形成能力高等特点,且该合金涂层具有优越的力学性能和耐腐蚀性能。本文旨在研究国内外激光熔覆Fe基非晶合金涂层最新的研究进展。总结了最新的制备方法,这些新方法不仅提升了传统激光熔覆材料的性能,还改善了表面涂层产生脆性而带来的裂纹和空隙。最后做以讨论和展望,为研究Fe基非晶涂层的制备工艺以及耐腐蚀、耐磨损等性能的发展提供了研究基础。 展开更多
关键词 FE基非晶合金 激光熔覆 表面技术 前沿进展
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高速激光熔覆液压立柱表面耐磨耐蚀Fe基非晶涂层制备工艺研究
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作者 夏平 黄海博 《煤矿机械》 2024年第9期93-96,共4页
为提高煤矿液压立柱在极端工况条件下的服役寿命,在液压立柱常用材料27SiMn钢表面利用高速激光熔覆技术制备了Fe基非晶涂层,并对其显微组织、硬度和耐磨耐蚀性能进行了研究。结果表明,涂层底部存在严重的晶化转变现象,但中部和顶部存在... 为提高煤矿液压立柱在极端工况条件下的服役寿命,在液压立柱常用材料27SiMn钢表面利用高速激光熔覆技术制备了Fe基非晶涂层,并对其显微组织、硬度和耐磨耐蚀性能进行了研究。结果表明,涂层底部存在严重的晶化转变现象,但中部和顶部存在大面积非晶相组织。涂层的显微硬度能够达到1 200 HV,是基材的5倍以上;磨损率为2.14×10~(-4)mg/N·m,较基材减少了5.9×10~(-5)mg/N·m,具有优异的耐磨损性能;涂层的Ecoor和Icoor分别为-0.57 V和8.41μA/cm~2,耐腐蚀性能较基材有明显提升。研究结果为提高液压立柱耐磨耐蚀性能提供了方法与思路。 展开更多
关键词 高速激光熔覆 FE基非晶合金 液压立柱 显微组织 耐磨耐蚀性能
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高端铝合金表面激光熔覆耐磨耐蚀涂层关键技术研究进展
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作者 张恒源 程旺军 +2 位作者 刘鹏飞 殷远东 孙耀宁 《金属加工(热加工)》 2024年第3期1-6,共6页
高端铝合金构件广泛应用于航空航天、石油化工及氢能储运等领域,但其表面存在耐蚀性与耐磨性差、强度与硬度低、晶粒粗化和表面橘皮等缺陷,进而限制其极端环境下的高性能安全服役,因此提高铝合金构件的表面质量和服役性能极为重要。激... 高端铝合金构件广泛应用于航空航天、石油化工及氢能储运等领域,但其表面存在耐蚀性与耐磨性差、强度与硬度低、晶粒粗化和表面橘皮等缺陷,进而限制其极端环境下的高性能安全服役,因此提高铝合金构件的表面质量和服役性能极为重要。激光熔覆作为铝合金构件表面改性和修复的有效技术,通过选取合适的熔覆材料在铝合金构件表面熔覆耐磨耐蚀、高强度涂层,可有效解决铝合金构件表面性能差、服役寿命短等问题。由于铝合金特殊的物理和化学性能,如熔点低、反光率大、润湿性差、稀释率大,以及易出现气孔、裂纹等问题,所以对铝合金构件表面激光熔覆带来挑战。因此,针对高端铝合金表面激光熔覆高性能涂层面临的技术难题,以提高铝合金构件表面服役强度、耐磨耐蚀性能为目标,综合分析了铝合金表面激光熔覆高性能涂层所涉及的基本理论、制备方法、涂层组织、服役性能及应用前景,该研究为铝合金复杂构件表面激光熔覆制备高性能涂层提供了理论参考。 展开更多
关键词 铝合金 激光熔覆 耐蚀耐磨涂层 关键技术 组织性能
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激光熔覆AlCoCrFeNi高熵合金涂层的高温磨损性能
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作者 林丽丽 陈星 +1 位作者 杜开平 皮自强 《热喷涂技术》 2024年第2期81-87,共7页
采用激光熔覆技术在42CrMo表面制备了Y掺杂AlCoCrFeNi高熵合金涂层,研究了涂层组织成分与高温摩擦磨损性能。结果表明:AlCoCrFeNi涂层主要由BCC相和B2相组成,900℃下涂层耐磨性约为基体的3.7倍,平均摩擦因数相比基体降低约22%。
关键词 高熵合金 激光熔覆 组织结构 高温磨损
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铝合金补焊工艺与疲劳性能的研究进展
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作者 贾剑平 徐鑫 《热加工工艺》 北大核心 2023年第19期14-19,共6页
铝合金具有氧化性强、热导率大和凝固收缩率大等特点,使用传统补焊工艺修复铝合金构件可能会使接头性能弱化,无法保证补焊修复质量。本文综述了搅拌摩擦焊、激光熔覆焊和冷金属过渡焊等新型修复技术的工艺特点及其在铝合金补焊领域的研... 铝合金具有氧化性强、热导率大和凝固收缩率大等特点,使用传统补焊工艺修复铝合金构件可能会使接头性能弱化,无法保证补焊修复质量。本文综述了搅拌摩擦焊、激光熔覆焊和冷金属过渡焊等新型修复技术的工艺特点及其在铝合金补焊领域的研究进展。针对铝合金结构补焊后疲劳性能下降问题,总结了疲劳破坏机理和工艺措施等方面的创新性研究成果,为铝合金补焊技术的理论研究和实际应用提供参考。 展开更多
关键词 铝合金 补焊修复 搅拌摩擦焊 激光熔覆 冷金属过渡 疲劳性能
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