共查询到19条相似文献,搜索用时 137 毫秒
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采用溶胶–凝胶法合成了Ni离子掺杂的LaAlO_3基高发射率红外辐射陶瓷粉体。研究表明:Ni离子掺杂能够显著提高LaAlO_3基陶瓷粉体的红外吸收性能,当Ni离子掺杂量为40%(摩尔分数)时,所制备的LaAl_(0.6)Ni_(0.4)O_(2.89)粉体红外吸收性能最佳;以LaAl_(0.6)Ni_(0.4)O_(2.89)为基料,采用铝溶胶为黏结剂,制备出3~5μm波段发射率高达0.93的红外辐射陶瓷涂层。Ni离子掺杂能够显著提高LaAlO_3基陶瓷材料红外辐射性能的物理机制在于:Ni离子进入LaAlO_3晶格后,在其带隙中引入了Ni^(3+)和Ni^(2+)杂质能级,形成了跃迁激活能仅需0.03eV的Ni^(3+)?Ni^(2+)小极化子吸收带;通过小极化子跃迁吸收,增强了LaAlO_3基陶瓷材料的红外辐射性能。这种新型的高发射率红外辐射陶瓷涂层在热工节能领域具有广阔的应用前景。 相似文献
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以碱金属氢氧化物及其氧化物和SiC等复配得到了高发射率红外辐射粉料,然后与硅橡胶混合配置,再通过空气喷涂法制备得到了高发射率红外辐射涂层。通过力学、热学、红外辐射、隔热试验等对涂层的各项性能进行了表征。结果表明:辐射涂层具有高红外发射率(>0.85),表现出优异的隔热性能。与添加1 mm长的碳纤维制备的涂层相比,3种添加500μm的短切玻璃纤维制备的自研辐射涂层具有更好的力学性能、界面结合强度以及表面状态。综合对比3种自研辐射涂层,其中添加由SiC以及铁、铝、镁的氧化物组成的辐射填料制备的涂层A效果最优,红外发射率高达0.93,拉伸强度达到2.89 MPa,断裂伸长率达到114%,拉伸剪切强度达到1.36 MPa。 相似文献
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《涂料工业》2016,(8)
红外吸收涂层已在低温工作环境中大量应用,其承载粘结剂的添加量在很大程度上影响了涂层的红外吸收性能及与基体的结合性能。将磷酸盐粘结剂与碳纳米管(CNTs)/镍粉基料混合制得涂料,然后将其涂覆在铜基体上制成红外吸收涂层,研究了粘结剂添加量对涂层性能的影响及机理。采用FT-IR、XRD、SEM对涂层的红外吸收性能、物相、晶体结构及形貌进行测试表征,并测试了涂层的抗热震性能来分析粘结剂对涂层性能的影响及机理。结果表明:当粘结剂磷酸盐含量为90%时,涂层综合性能最佳,在1 400~3 570 cm~(-1)范围内平均光吸收度达1.99,涂层的抗热震次数可达35次(25~120℃)。 相似文献
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《Journal of the European Ceramic Society》2020,40(15):5217-5225
High emissivity coatings on nickel-based superalloy, with good infrared radiating ability and good high temperature resistance, were prepared at room temperature, using preceramic polymer cured at room-temperature as coating former and CeO2 and B4C as passive high emissivity fillers. The influences of high temperature and wind channel test on the microstructure and thermal performance of the high emissivity coating were investigated in detail. The high emissivity coating has good thermal stability and no cracking and flaking after heating at 1100 K and the wind tunnel test. The emissivity of the coating reached 0.85−0.92 between room temperature and 1100 K. The high emissivity coating on the nickel-based alloy can make the back temperature of the nickel-based alloy decrease from 686 to 646 ℃. 相似文献
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《国际聚合物材料杂志》2012,61(11):891-901
The effects of filler and coating on the behaviors of water and oil-based ink on the paper surface were investigated. Fillers reduced the air permeability and surface energy hence increased the liquids uptake. The coating was more effective than the internal addition of fillers for the improvement of water and ink absorption. Sizing interfered with the fillers, but had negligible effects on the movements of oil-based ink on papers. The quality of coating in terms of printing performance was dependent on the improvement of surface smoothness, microcapillary formation and the absorption properties of fillers in the coating layer. 相似文献
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The Research of Radar Absorbing Property of Bicomponent Fibers with Infrared Camouflage 总被引:1,自引:0,他引:1
The bicomponent fibers were prepared for the radar absorbing and infrared camouflage. The fibers were melt-spun by co-extrusion
of polypropylene (PP) and PP/fillers master-batches using general conjugate spinning. Master-batches were made up of mixture
of PP chips and inorganic particle. The radar absorbing property was evaluated by an arch method. The fibers filled with the
barium ferrite, Mn–Zn ferrite and bronze fillers had good radar absorbing effect. The input of infrared camouflage fillers
in the sheath-part showed a limited effect on the radar wave absorbing properties of the bicomponent fibers. For the characterization,
differential scanning calorimetry (DSC) and mass specific electrical resistance apparatus (MSERA) were used for analysis of
thermal and crystallization behavior and electric performance of the spun-fibers. Scanning electron microscopy (SEM) was carried
out to observe particle distribution on the bicomponent fibers. 相似文献
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涂料原料和涂层厚度对反射隔热保温性能影响研究 总被引:8,自引:0,他引:8
通过研究涂料配方中所用乳液、颜料、常规填料和隔热填料在红外灯下的反射、隔热和保温性能,发现高折射率的二氧化钛和含有微孔的硅藻土具有最佳的反射和隔热保温效果,轻质碳酸钙和重质碳酸钙具有一定的隔热保温作用,而理论上具有隔热保温效果的填料海泡石等并没有预期的效果。涂层厚度对隔热保温效果具有一定影响,但是没有颜料和填料的影响大。隔热涂料使用的填料应含有硅藻土、二氧化钛以及一些常规的填料。 相似文献
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为节约电能,提高汽车涂装的生产率,提出了一种节能改造方案,通过在烘干室内安装远红外定向辐射器。对电泳底漆和面漆烘干室进行了改造。估算了改造后的经济效益。结果表明,经上述改造,可节约大量电能,提高生产率和涂膜质量。 相似文献
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Based on modified silicon polyester resin in addition to several functional fillers such as corro-sion-resistant fillers, heat-resistant fillers and thermal conductive fillers, a high thermal conductive coating can be made. On the basis of boronnitride (BN) and aluminum nitride (AIN) used as thermal conductive fillers and by means of the testing system of hot disk and heat transfer experiment, researches on the varieties of thermal conduc-tive fillers and the effects of the contents of high-thermal conductive coating have been done, which shows that the thermal conductivity of coating increases with the increase of the quality fraction and the coefficient of thermal conductivity of the thermal conductive fillers of coating. With guaranteeing better heat resistance, stronger corro-sion resistance and adhesive force, the coefficient of coating can reach a level as high as 3 W·m^-1·K^-1. 相似文献