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1.
高速电弧喷涂Fe3Al/WC复合涂层高温冲蚀行为研究   总被引:6,自引:0,他引:6  
采用自行研制的新型热喷涂Fe3Al/WC复合合金粉芯丝材,成功地用高速电弧喷技术制备出了Fe3Al金属化合物基金属陶瓷复合涂层。对涂层成分、显微组织、涂层相结构和组成进行了分析,结果表明,涂层由以Fe-26Al为主的Fe3Al基体相与约20%的WC、W2C和 a-Al2O3相组成。对比研究了Fe3Al/WC涂层和电站锅炉钢20 g从室温至650 ℃氧化环境条件下不同攻角的高温冲蚀磨损性能,结果表明Fe3Al/WC涂层的高温冲蚀磨损抗力高于20 g钢,650 ℃和30°攻角下的稳态相对冲蚀磨损抗力为20 g钢的3.14倍。温度对Fe3Al/WC涂层的冲蚀行为有较大影响:温度 < 450℃,涂层的冲蚀率变化不大,表现出塑性材料的冲蚀行为;温度 >450 ℃,涂层冲蚀率变化较大,呈现典型的脆性材料冲蚀磨损行为。并对其高温冲蚀磨损机理进行了分析。  相似文献   

2.
采用粉芯丝材和高速电弧喷涂技术(HVAS)制备了Fe-Al/WC金属间化合物基复合涂层,并研究了涂层的显微组织和从室温至650℃的滑动磨损性能。结果表明,涂层的成分为Fe-13.87Al-17.27C-3.35W-2.59Ni-1.27Cr-18.140(%),主要相是Fe3Al、FeAl和α-Fe,还有少量WC、W2C和A12O3;添加WC硬质相后提高了复合涂层的平均硬度,从而提高了复合涂层的耐磨性;高温下磨损面形成了大面积的氧化物保护层,降低了复合涂层的摩擦因数,分析认为剥层磨损是复合涂层的主要磨损机理。涂层中Fe3Al和FeAl金属间化合物相较高的高温强度和硬度,能有效地阻碍裂纹的产生、扩展及扁平颗粒的断裂,从而使复合涂层表现出优异的高温耐磨性。高速电弧喷涂技术配-Fe-Al/WC粉芯丝材是一种新型、优质、高效、低成本的耐高温涂层制备技术,具有很大的应用潜力。  相似文献   

3.
几种高速电弧喷涂层高温冲蚀磨损性能   总被引:3,自引:1,他引:2       下载免费PDF全文
用高速电弧喷涂技术制备出用于热电厂抗高温冲蚀磨损的FeCrAl/WC、FeCrNi/WC、Fe3Al和Fe3Al/WC复合涂层。研究了涂层在不同的温度和冲蚀角度下的高温冲蚀磨损性能。结果表明,温度和攻角对Fe,Al/WC、FeCrAl/WC涂层的冲蚀行为有较大影响;在650℃棱角状石英砂磨粒冲蚀条件下,Fe3Al、Fe3Al/WC、FeCrAl/WC复合涂层的抗冲蚀磨损性能明显优于G20钢,FeCrAl/WC涂层具有最好的全攻角冲蚀磨损抗力,可以作为燃煤锅炉管道的抗高温燃气-飞灰高温冲蚀磨损的防护涂层。  相似文献   

4.
高速电弧喷涂Fe-Al/WC复合涂层在650℃下的氧化行为   总被引:5,自引:1,他引:4  
采用高速电弧喷涂技术在20G钢基体上制备了Fe-Al/WC金属间化合物复合涂层,利用热重天平测试了涂层在650℃下的氧化性能。结果表明:Fe-Al/WC复合涂层的氧化动力学曲线近似呈现出对数规律;涂层的氧化物以Al2O3、Fe2O3、Fe3O4和FeO等为主,且其分布不均匀;涂层表面优先形成具有保护性的Al2O3膜,阻止了涂层的进一步氧化。  相似文献   

5.
高频感应熔覆WC增强Ni60合金涂层性能研究   总被引:6,自引:0,他引:6  
采用高频感应熔覆方法在Q235低碳钢基体上制备了不同含量的WC增强Ni60A合金复合涂层.利用SEM和XRD分析了涂层的显微组织和相结构,并进行了耐磨性试验.结果表明,复台涂层中主要由WC、W2C、Cr7C3、Cr23C6、Cr2B、Ni2B、Ni3Si及Ni3Fe等相组成,并与基体实现了冶金结合.在相同试验条件下,涂层的硬度和耐磨性随WC含量的增加而提高,加入WC涂层的相对耐磨性为Ni60A涂层的2-6倍,当WC加入量为50%时涂层的耐磨性最好,为Ni60A涂层的6.5倍.涂层的磨损机制主要为轻微的塑性切削和硬质相的脆性剥落.  相似文献   

6.
高速电弧喷涂Fe-Al金属间化合物涂层   总被引:5,自引:1,他引:4  
采用粉芯丝材和高速电弧喷涂技术(HVAS)制备了Fe-Al金属间化合物涂层,并研究了涂层的显微组织和室温至650℃的滑动摩擦磨损性能.结果表明:Fe-Al涂层的平均成分为Fe-20.0Al-14.1O(摩尔分数,%),主要相是Fe3Al,FeAl,α-Fe,Al2O3及少量Al;涂层具有较高的结合强度和硬度、较低的孔隙率及较高的高温耐磨性;高温下磨损面形成了大面积的氧化物保护层,降低了涂层的摩擦因数,而剥层磨损是涂层的主要磨损机制.涂层中Fe3Al和FeAl金属间化合物相较高的高温强度和硬度能有效地阻碍裂纹的产生、扩展及扁平颗粒的断裂,从而使Fe-Al涂层表现出优异的高温耐磨性.  相似文献   

7.
采用WC/Fe/Al混合粉末,通过机械合金化制备40v0l% WC/Fe(Al)固溶体复合粉末,利用冷喷涂沉积涂层并结合热处理原位反应制备了WC/FeAl金属间化合物基金属陶瓷涂层.研究了球磨时间对复合粉末相结构、晶粒尺寸及组织结构的影响,并分析了冷喷涂WC/FeAl金属间化合物基金属陶瓷涂层的组织和显微硬度.结果表明,机械合金化可获得WC陶瓷颗粒呈微/纳米多尺度分布的WC/Fe(Al)金属陶瓷复合粉末,球磨36 h的复合粉末基体相平均晶粒尺寸约为90 nm,冷喷复合涂层组织致密、多尺度WC颗粒在基体中均匀弥散分布,涂层显微硬度约为1060 HV0.3,涂层在650℃热处理后发生Fe(Al)固溶体向FeAl金属间化合物的原位转变,制备出了WC/FeAl金属间化合物基金属陶瓷涂层.  相似文献   

8.
WC含量对铁基涂层非晶形成能力及其性能影响   总被引:1,自引:0,他引:1  
采用电弧喷涂技术喷涂不同WC含量的Fe基粉芯丝材,在Q235低碳钢基体上制备5种不同非晶含量的Fe基合金涂层.利用光学显微镜、透射电子显微镜、扫描电子显微镜和X射线衍射仪对涂层的显徼组织结构、磨损表面及其相组成进行分析,用MLS-225型湿砂橡胶轮磨损试验机评价铁基复合涂层的磨粒磨损性能.结果表明,制备的几种涂层中均含有非晶相,当粉芯中WC质量分数在30%以内时,随着WC含量的增加,涂层中的非晶含量增加,相应涂层的硬度增加,耐磨性保持稳定;涂层的磨损机制主要为硬质相的脆性剥离和轻微的塑性切削,在磨粒磨损情况下硬度较低的金属基体先磨损,硬度高的Fe2B硬质相起到了阻止石英砂磨损的作用,从而降低了涂层的磨损.  相似文献   

9.
采用喷涂法+溶胶.凝胶法相结合的复合工艺制备了表面光洁、无宏观裂纹的钢基Fe/Al2O3梯度复合材料,并利用扫描电子显微镜、X-ray等对其性能进行测试。结果表明:梯度涂层主要由α-Al2O3,AlFeO3,AlFe3和Al86Fe14等物相组成,其界面Al元素和Fe元素呈准连续变化;梯度涂层与钢基体界面结合强度平均达到17.62MPa:比较钢基Fe/Al2O3梯度复合材料表面和钢基体的硬度、耐磨性及耐腐蚀性,发现前者均比后者优越,其中前者的硬度大约是后者的4.5倍,摩擦磨损量前者约为后者的二分之一。  相似文献   

10.
铸钢表面电火花沉积层摩擦磨损性能   总被引:3,自引:0,他引:3  
采用新型电火花沉积设备,把WC-4Co陶瓷硬质合金材料沉积在铸钢材料上,制备了电火花沉积合金涂层,用SEM、XRD等技术研究了沉积层的物相、微观组织结构、元素分布、显微硬度及室温高温耐磨性能及磨损机理。结果表明:沉积层主要由Fe3W3C、Co3W3C和Fe2C等相组成;沉积层与基体呈冶金结合,过渡层出现一些柱状晶和树枝状晶组织结构,沉积层中细小的Fe3W3C和Co3W3C等硬质相颗粒弥散分布于Fe2C基体上。沉积层的平均显微硬度为1803.2 HV;室温下沉积层的耐磨性和300℃高温条件下沉积的耐磨性分别比同样条件下铸钢材料的磨损性能提高了2.5倍和3.4倍;不论室温还是300℃高温条件下沉积层的磨损机理主要是粘着磨损、疲劳磨损、氧化磨损和磨粒磨损的综合作用,细小的弥散分布的硬质相是沉积层硬度及耐磨性提高的主要因素。  相似文献   

11.
Institute of Process Engineering, Chinese Academy of Sciences, China, has proposed a method for oxidative leaching of chromite with potassium hydroxide. Understanding the mechanism of chromite decomposition, especially in the potassium hydroxide fusion, is important for the optimization of the operating parameters of the oxidative leaching process. A traditional thermodynamic method is proposed and the thermal decomposition and the reaction decomposition during the oxidative leaching of chromite with KOH and oxygen is discussed, which suggests that chromite is mainly destroyed by reactions with KOH and oxygen. Meanwhile, equilibrium of the main reactions of the above process was calculated at different temperatures and oxygen partial pressures. The stable zones of productions, namely, K2CrO4 and Fe2O3, increase with the decrease of temperature, which indicates that higher temperature is not beneficial to thermodynamic reactions. In addition, a comparison of the general alkali methods is carried out, and it is concluded that the KOH leaching process is thermodynamically superior to the conventional chromate production process.  相似文献   

12.
The effect of isochronal heat treatments for 1h on variation of damping, hardness and microstructural change of the magnesium wrought alloy AZ61 was investigated. Damping and hardness behaviour could be attributed to the evolution of precipitation process. The influence of precipitation on damping behaviour was explained in the framework of the dislocation string model of Granato and Lücke.  相似文献   

13.
In as-welded state, each region of 2219 aluminum alloy TIG-welded joint shows diff erent microstructure and microhardness due to the diff erent welding heat cycles and the resulting evolution of second phases. After the post-weld heat treatment, both the amount and the size of the eutectic structure or θ phases decreased. Correspondingly, both the Cu content in α-Al matrix and the microhardness increased to a similar level in each region of the joint, and the tensile strength of the entire joint was greatly improved. Post-weld heat treatment played the role of solid solution strengthening and aging strengthening. After the post-weld heat treatment, the weld performance became similar to other regions, but weld reinforcements lost their reinforcing eff ect on the weld and their existence was more of an adverse eff ect. The joint without weld reinforcements after the post-weld heat treatment had the optimal tensile properties, and the specimens randomly crack in the weld zone.  相似文献   

14.
After nearly two years' tense construction, the first phase of industrialized base of Shenyang Research Institute of Foundry (SRIF), located at the Tiexi Casting and Forging Industrial Park in the west of Tiexi District, has now been completed and formally put into operation.  相似文献   

15.
韩磊 《腐蚀与防护》2015,36(1):84-90,94
综述了常见的电化学噪声数据处理方法,介绍了直流趋势剔除、统计分析、快速傅立叶变换(FFT)法计算功率谱密度(PSD)以及小波变换处理电化学噪声信号的基本过程,并阐释了各种数学处理及所得参数的物理意义。  相似文献   

16.
正I take great pleasure in congratulating CHINA FOUNDRY journal on its 10th anniversary.The CHINA FOUNDRY journal started ten years ago.Since its inaugural,China has seen exceptional growth in the Castings Sector and rapid development in Machinery Industry.The journal is becoming an important communication platform for experts  相似文献   

17.
正Harbin General Hydraulic Machinery Works Co.,Ltd.of Yilin Hydraulic Group is the most professional production base of large-scale metallurgy oil cylinder and oil machinery cylinder in the Northeast of China.The main products include metallurgy cylinder,swell-shrink cylinder,rotating injection device,lifting cylinder,main lifting jack,front lifting jack,engineering oil cyl-  相似文献   

18.
正Weihai HHH Mach.Elec.Group is the most technical company focusing on Power transmission and Hydra-controlling.HHH has the ability of developing and testing of complete sets of transmission system with relevant technical training.HHH provide efficient,excellent cost-effective power transmission system and intelligent electric fluid transmission and control system to OEM customers,who are  相似文献   

19.
《中国铸造》2014,(5):460-463
The 9th China International Diecasting Congress and the 1st International Symposium on Nonferrous Alloys and Special Casting Technologies (ISNASCT) were successfully held in Shanghai on July 19-22, 2014. Both events were jointly sponsored by Chinese Mechanical Engineering Society, Die Casting Commission of World Foundry Organization and Non-Ferrous Materials Commission of World Foundry Organization, and organized by the Foundry Institution of Chinese Mechanical Engineering Society (FICMES) and China Productivity Promotion Center of Foundry Industry.  相似文献   

20.
《中国铸造》2014,(6):539-539
The ANKIROS/ANNOFER/TURKCAST shows held on Sept. 11-14, 2014, in Istanbul, Turkey, provided an ideal opportunity for the World Foundry Organization Executive Board to meet and discuss member benefits. Nine executive board members attended the meeting, including Dr. Lou Yanchun, Vice President of FICMES and President of Shenyang Research Institute of Foundry. During the board meeting, the WFO executives agreed to establish a special working group which is responsible for drafting a strategical plan for the WFO and submitting it for discussion at the next board meeting in 2015.  相似文献   

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