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从粉末涂料的现状出发说明开发丙烯酸粉末涂料的重要性,介绍了丙烯酸粉末涂料的特性,重在阐述了通过对丙烯酸树脂不同的活性官能团与不同的树脂或固化剂交联得出工业化应用体系及其优缺点。 相似文献
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研究高装饰性丙烯酸树脂粉末涂料,其目的在于增加粉末涂料的新品种。特别是在汽车面漆的涂装中,用装饰性丙烯酸粉末涂料(性能和溶剂型丙烯酸涂料相似)代替溶剂型涂料,以加快我国涂料工业向省能、节资、防止污染的方向发展的步伐,增加涂料品种,缩短涂装技术与世界先进技术的差距,是具有重大意义的。 相似文献
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采用溶液沉淀聚合工艺,制备以三氟氯乙烯为主要共聚单体热固性氟粉末树脂,分析探讨树脂结构设计及各组分影响,介绍了热固性氟粉末涂料耐酸碱、盐雾、老化等性能试验结果,最后针对应用于不同金属基材的表面处理工艺做了探索性研究。 相似文献
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在进行粉末静电喷涂工艺试验时,我厂曾遇到两起故障,一是铜焊接件铜焊部位变色发黄,二是铸件局部点、线状无粉末涂层。最后通过反复试验,都获得了圆满解决。先谈铜焊接件的变色发黄故障。这里的铜焊接件是指以铜为焊接材料的钢件组合体。我厂使用的粉末涂料是浙江某厂生产的豆绿色美术型环氧丙烯酸粉末涂料,在发现喷涂该粉末涂料会使铜焊接件铜焊部位变色后,我们很自然地认为这是由于该粉末涂料 相似文献
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热塑性丙烯酸树脂是近几年发展的具有优良性能,并被广泛应用的一种新型涂料。本文介绍热塑性丙烯酸树脂涂料的分子结构、性能及所选单体的种类和配比对其性能的影响,并根据生产实践介绍了热塑性丙烯酸树脂在塑料制品上应用的工艺。 相似文献
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氟改性和硅改性丙烯酸聚氨酯涂层的制备及环境行为 总被引:2,自引:2,他引:0
目的研究氟改性和硅改性丙烯酸聚氨酯涂层在不同环境中的失效行为。方法通过溶液聚合法制备具有一定羟基含量的丙烯酸酯树脂,再将丙烯酸树脂与多异腈酸酯固化剂配合,获得丙烯酸聚氨酯涂层。通过在丙烯酸酯合成中引入含氟丙烯酸酯单体,制得氟改性丙烯酸聚氨酯涂层;通过在固化过程中引入氨基硅油,制得硅改性丙烯酸聚氨酯涂层。利用傅里叶变换红外光谱(FT-IR)分析涂层的化学组成。对涂层试样进行温度环境实验(室温和100,150℃)、湿热环境实验和氙灯老化实验,分析涂层疏水性、光泽度等表面特性的变化。结果氟、硅改性有效提高了涂层的疏水性。未改性、氟改性和硅改性三种涂层在100℃以下的环境中服役时,疏水性和光泽度比较稳定。硅改性涂层在150℃的高温环境中较未改性和氟改性涂层失效慢。湿热环境对三种涂层的接触角和光泽度等性能影响不大。氟改性涂层在氙灯老化环境中的失效程度较另外两种涂层轻。结论氟改性涂层耐光老化性能较好,硅改性涂层耐温性较好。 相似文献
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制备了自熔合金粉末激光熔覆涂层试件,在多次撞击疲劳试验机上进行了可靠性试验。借助MATLAB对样本数据进行分析,建立了激光涂层零件的多冲可靠性模型。分析得出激光涂层零件在多冲载荷下疲劳寿命服从对数正态分布,并拟合P-S—N曲线,建立了多冲应力与疲劳寿命以及可靠度之间的关系。在理论分析的基础上设计了可靠性建模界面,为进一步的可靠性分析提供基础。 相似文献
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有机涂层在模拟沙漠大气环境下的加速试验研究 总被引:2,自引:3,他引:2
目的在较短的时间内获得有机涂层在沙漠大气环境下的腐蚀失效规律。方法针对有机涂层中应用比较广泛的丙烯酸聚氨酯涂层,采用紫外暴晒与吹沙试验相结合的加速试验环境谱进行实验室模拟沙漠大气环境加速老化试验,通过分析涂层质量、厚度、光泽度、表面形貌及电化学阻抗的变化,研究有机涂层的老化失效过程。结果随着加速试验周期的延长,丙烯酸聚氨酯涂层发生了一系列变化,表现为涂层质量减小,厚度减薄,光泽度降低,表面微观缺陷增多,电化学低频阻抗模值减小,防护性能下降。结论通过加速试验,可以快速获得有机涂层在沙漠大气环境下的老化失效规律。 相似文献
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目的 以40Cr钢为基体,制备掺杂铬铁原矿粉的CrFeNiSiAl0.5高熵合金涂层,提高其硬度与耐磨性.方法 在Cr、Fe、Ni、Al、Si纯金属粉末中掺杂铬铁原矿粉,矿粉有效原子数分数为0%、5%、10%、15%时,采用激光熔覆技术,在40Cr钢基体上制备CrFeNiSiAl0.5高熵合金涂层.利用X射线衍射仪、金相显微镜、扫描电子显微镜,表征高熵合金涂层的物相结构及微观组织.利用硬度计、磨粒磨损机,对涂层的硬度及耐磨性能进行表征.结果 不含铬铁原矿粉时,高熵合金涂层为单一的BCC相,铬铁原矿粉为10%时,出现FCC相.高熵合金涂层微观组织以胞状树枝晶为主,涂层与结合区存在明显分界,与基体呈良好的冶金结合.不含铬铁原矿粉时,高熵合金涂层平均硬度值为643.5HV;铬铁原矿粉为15%时,涂层平均硬度值为838.1HV,是基体的3.4倍.磨损率随铬铁原矿粉占比的增加而降低,铬铁原矿粉有效原子数分数为15%时,磨损率约为0.14 mg/mm2,耐磨性能最好.结论 在40Cr钢基体上成功制备出了以铬铁原矿粉为掺杂组元的高熵合金涂层,铬铁原矿粉的掺入,提升了CrFeNiSiAl0.5高熵合金涂层的硬度与耐磨性. 相似文献
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Shenglin Liu Dongbai Sun Zishuan Fan Hong-ying Yu Hui-min Meng 《Surface & coatings technology》2008,202(20):4893-4900
In this paper, the HVAF technique was used to deposit coatings with mechanically milled nano and micron blended WC-NiCr powders. The mechanically milled nano powder was produced using the high-energy ball milling process. Due to low particle heating and high particle velocity in the HVAF process, the fine and dense microstructure of the mechanically milled powder remains almost unchanged after spraying. The sliding wear resistance of the two coatings was evaluated by ball-on-disc tests. It was found that the sliding wear resistance of the coating produced using mechanically milled powders was greatly improved compared with the coating produced using micron blended powder. The sliding wear resistance of the coating produced using mechanically milled powder was about two hundred times than that of the coating produced using blended powder. The coefficient of friction for the coating produced using mechanically milled powder increased steadily from 0.22 to 0.51, while for the coating produced using blended powder it attained a steady value of 0.58. Both the coating produced using mechanically milled powder and blended powder were characterized in terms of their microstructure by X-ray diffraction, and scanning electron microscopy in the as-sprayed state as well as after sliding wear. The sliding wear mechanism was also discussed. 相似文献
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Alumina coatings were prepared using detonation gun from commercial powder (CP) and high energy ball milled powder (MP) with 83 nm crystallite size. The sliding wear rate and wear coefficient of friction were lower in the nanocrystalline powder coating. The coating from the as-received commercial powder consisted of thick splats, and a paucity of nanoparticulate inter-splat regions whereas milled powder coating has thinner splat morphology with nanoparticulate inter-splat regions. The nanoparticulate material in the inter-splat regions and the finer microstructure of the MP coating is believed to be responsible for improved wear resistance. 相似文献
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目的通过机械球磨加粘结破碎法制备可用于超音速火焰喷涂制备MoB-CoCr涂层的Mo-B-Co-Cr复合粉末。方法通过机械球磨加粘结破碎法制备m(MoB):m(CoCr)分别为1:1、2:1和3:1复合粉末,研究所制备的三种复合粉末的组织形貌及物相,并将所制备的m(Mo B):m(CoCr)=1:1复合粉末进行超音速火焰喷涂实验制备MoB-CoCr涂层,研究所制备涂层的组织结构。采用扫描电子显微镜观察粉末和涂层的形貌,通过X-射线衍射仪分析复合粉末的物相,通过图像法测量涂层的平均孔隙率和厚度。结果制备的三种复合粉末各相之间结合良好,组织形态呈近球形。经过X-射线衍射发现,三种复合粉末中未发现杂质及氧化现象,复合粉末的物相主要为Mo、Co和Cr三相,随着MoB质量比的增加,复合粉末中Mo相的峰值逐渐增高。通过对m(MoB):m(CoCr)=1:1复合粉末进行超音速火焰喷涂技术制备涂层,发现所制备的MoB-CoCr涂层形态呈典型的层状结构,涂层组织致密性较好,且涂层各相间及涂层与基体界面结合良好。结论采用机械球磨加粘结破碎法可制备近似球形的Mo-B-Co-Cr复合粉末,通过超音速火焰喷涂技术可成功制备组织结构较好的MoB-CoCr涂层。 相似文献
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W. Wong P. Vo E. Irissou A. N. Ryabinin J.-G. Legoux S. Yue 《Journal of Thermal Spray Technology》2013,22(7):1140-1153
The effects of commercially pure titanium particle morphology (spherical, sponge, and irregular) and size distributions (mean particle sizes of 20-49 μm) on the cold spray process and resulting coating properties were investigated. Numerous powder and coating characterizations were performed including: powder oxygen and nitrogen contents, powder flowability, powder compressibility, coating microhardness, coating porosity, LOM/SEM analyses, and XRD. Compared to spherical powders, the sponge and irregular CP-Ti powders had higher oxygen content, poorer powder flowability, higher compression ratio, lower powder packing factor, and higher average particle impact velocities. XRD results showed no new phases present when comparing the various feedstock powders to corresponding coatings. A higher particle temperature was also obtained with larger particle size for all feedstock powder morphologies processed with the same set of spray parameters. A spherical powder with 29 μm mean particle size was found to have the lowest porosity coating and best cold sprayability. The relationships of several as-cold sprayed coating characteristics to the ratio of particle impact and critical velocities were also discussed. 相似文献
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