金属基高温耐磨陶瓷涂层的研制及耐磨性能

研制了一种用陶瓷骨料与自制无机胶粘剂为原料，具有高温耐磨性能的陶瓷涂层配方，探讨了影响涂层耐磨性能的因素。发现：当磷酸铝胶粘剂中Al2O3与P2O5之比为1．3：3－1．4：3，涂层中的骨料与胶粘剂的配比为1．7：1，且骨料中粗颗粒含量为40％－50％时，所配制的涂层性能最佳。     

金属基陶瓷涂层的制备,应用及发展

综述了金属基陶瓷涂层的概况,制备方法及应用现状,并指出今后的研制发展方向。     

激光表面改性在金属基陶瓷涂层制备中的应用

概述了激光表面改性技术的基本原理,综述了激光表面合金化、激光熔覆、激光重熔和激光沉积等激光表面改性技术在金属基陶瓷涂层制备中的应用,对各项技术的原理、特点和国内外研究现状分别加以描述,最后指出激光表面改性技术在未来领域的发展方向。     

金属基陶瓷涂层的制备、应用及发展

本文综述了金属基陶瓷涂层的概况、制备方法及应用,并指出了陶瓷涂层今后研究的发展方向。     

FeCrAl基高温抗氧化陶瓷涂层抗热震性能的研究

采用陶瓷粘结相与Cr2O3制成料浆,在空气中1300℃下熔烧制备FeCrAl基高温抗氧化陶瓷涂层。研究了分散相Cr2O3的添加量和涂层厚度对试样抗热震性能的影响。结果表明:当Cr2O3的添加量为50%(质量分数,下同)、涂层厚度100μm和熔烧制度为1300℃×60min的条件下,涂层试样的抗热震次数可达16次(室温←→1200℃)。采用SEM、高温热膨胀仪等测试手段对涂层试样的组织结构及性能进行表征,揭示了涂层组织结构与抗热震性能之间的关系。     

等离子喷涂金属基热障涂层的研究

简述了金属基热障涂层的结构设计，等离子喷涂层制造工艺特点，影响因素，以及热障涂层的应用。     

金属基高温耐磨陶瓷涂层的研制及耐磨性能的影响因素

本课题研制了一种用陶瓷骨料与自制无机胶粘剂为原料，具有高温耐磨性能的陶瓷涂层配方，并探讨了影响涂层耐磨性能的因素。发现：当磷酸铝胶粘剂中Al2O3与P2O5之比为1.3:3-1.4:3涂层中的骨料与胶粘剂的配比为1.7:1，且骨料中粗颗粒含量为40－505时，所配制的涂层耐磨性能最佳。     

硅溶胶包覆氧化铝陶瓷的抗热震性能研究

通过对表面包覆10 wt%硅溶胶的氧化铝粉体在不同温度下进行煅烧,并以不同温度煅烧后的粉体为原料制备陶瓷,探讨了硅溶胶包覆对氧化铝陶瓷烧结性能、力学性能以及抗热震性能的影响规律。结果发现,硅溶胶在氧化铝粉体颗粒表面形成良好包覆,这种完整包覆可以维持在900℃不发生变化;当煅烧温度超过1000℃时,部分硅溶胶从氧化铝表面剥落,形成细小颗粒填充在氧化铝粉体颗粒间的间隙,有效促进了陶瓷饱和体积密度的提高,从而使得陶瓷具有良好的抗弯强度,但其抗热震性能较差;当粉体的煅烧温度较低时,将获得多孔的陶瓷结构,可以有效提高陶瓷的抗热震性能,700℃煅烧过的粉体制成陶瓷,可以经受1200℃的热震11次。     

金属基高温耐磨陶瓷涂层的制备与研究

针对燃煤火力发电厂锅炉管道的磨损问题,采用改性无机溶胶为粘结剂,高硬度无机颗粒材料为骨料,无机纤维作为增强材料,辅以其他多种陶瓷材料作为填料,研制了一种常温下涂刷、固化,并可以在700℃以下温度中长期稳定使用的环保型金属基陶瓷高温耐磨涂料。实验对涂料的主要性能进行了测试,并对涂料中的各因素对涂层性能的影响进行了研究和机理分析。     

炭/陶复合材料的抗热震性能研究

对含石墨的炭／陶复合材料优良的抗热震性能进行了讨论。这种性质与石墨的导热系数大、断裂功高、热膨胀和弹性模量小密切相关。     

金属陶瓷涂层耐蚀性影响因素的研究

研究了溶胶制备中所用催化剂种类、基体金属前处理及涂层厚度对金属陶瓷涂层耐蚀性的影响,不含ＣＩ＾－催化剂的溶胶－凝胶配方所得陶瓷涂层的耐蚀性最了,适当的前处理及适宜的涂层厚度有利于提高陶瓷涂层的耐蚀性。     

金属陶瓷涂层耐蚀性能研究

采用溶胶－凝胶浸渍提拉法在不锈钢、纯铜及铝合金基体上制备具有保护性的ＳｉＯ２、ＺｒＯ２、ＴｉＯ２、Ａｌ２Ｏ３及ＳｉＯ２－ＴｉＯ２陶瓷涂层,利用阳极极化曲线的、循环动电位极曲线、点蚀电位的测量以及三氯化铁和５％硫酸介质中的腐蚀试验研究了所得陶瓷涂层的耐蚀性。结果表明,这些陶瓷涂层能大幅芳提高金属基体在各种腐蚀介的耐蚀性。     

Q235钢热化学反应法制备玻璃质陶瓷涂层的研究

采用热化学反应法,以MgO–SiO2、MgO–Al2O3为基料,分别添加6种低熔点玻璃粉,在Q235钢表面制备不同玻璃质陶瓷涂层。研究了各种涂层的热固化状况。结果发现,以MgO–SiO2为基料的G3、G4和G5涂层有良好的外观。耐蚀、耐磨和抗热震性实验表明,以m(MgO)∶m(SiO2)∶m(5#玻璃粉)=9∶9∶2为基料的G5涂层其性能最佳。XRD谱图和SEM照片显示,G5涂层生成了新的陶瓷相,从而增强了基体和涂层的结合力。     

Design,thermal shock resistance of dense BaO-Al2O3-SiO2 glass/Si3N4-barium feldspar coating for porous Si3N4 ceramic

Silicon nitride-monoclinic barium feldspar (Si₃N₄-m-BAS) composite possesses great dielectric properties, low density, and low thermal expansion coefficient (CTE). Preparing dense Si₃N₄-m-BAS coating on porous Si₃N₄ ceramic is an effective strategy to improve its water resistance and ensure its dielectric performances. However, this promising coating has not been reported yet, because the synthesis of m-BAS is difficult, and the densification of Si₃N₄-BAS composite requires very high temperature. Here, the BaO-Al₂O₃-SiO₂ glass/Si₃N₄-BAS coating was first fabricated by a manual spray method and pressureless sintering at 1450°C. Combining the influence of Si⁴⁺ on the crystal phase composition of BAS and the volume expansion effect of silicon in N₂, an effective coating structure design scheme was proposed. By changing the content of silicon powder, the CTE and horizontal shrinkage of the coating during sintering were controlled. Besides, the prepared coatings exhibited low water absorption and high bonding strength. During the thermal shock tests, SiO₂ produced by the oxidation of Si₃N₄ healed the cracks in the coating, thus delaying the degradation of the properties. The coating prepared in this work is expected to be applied to radome in extreme service environments.     

Composite ceramic coating with enhanced thermal shock resistance formed by the in-situ synthesis of nano-ZrO2

In this research, nano-ZrO₂/TiO₂ composite coatings were designed for titanium alloys by the in-situ incorporation of ZrO₂ nanoparticles into a TiO₂ ceramic coating. Precise control over the content and structure of nano-ZrO₂ in this nanocomposite coating was achieved by manipulating the pH of the electrolyte during plasma electrolytic oxidation (PEO). The synthesis process and mechanism of tetragonal zirconia (t-ZrO₂) were revealed by analyzing the phase composition and microstructure of the coating. The influence of pH on the formation of t-ZrO₂ was also revealed. By detecting changes in the electrolyte solute composition before and after PEO, the Zr(OH)₄ precursor was determined to be the source of the t-ZrO₂ nanoparticles in the composite coating. The yield of t-ZrO₂ in the composite coating increased upon increasing the pH of the electrolyte. Moreover, the thermal shock tests showed that increasing the t-ZrO₂ content remarkably improved the thermal resistance of the coatings. This strategy and the research outcomes are expected to have great significance for developing advanced nanocomposite coatings on titanium alloys with enhanced thermal shock resistance.     

Thermal shock resistance of the porous boron nitride/silicon oxynitride ceramic composites

The thermal shock resistance of the porous boron nitride/silicon oxynitride (BN/Si₂N₂O) ceramic composites were tested by the quenching‐strength method with temperature differences of 600‐1400°C. The residual flexural strength of the composites decreased with increasing temperature difference from 600°C to 900°C. This weakening in flexural strength was attributed to the formation of microcracks in the matrix caused by thermal stress damage. Afterward, as the formation of a dense oxidized layer sealed the surface and hindered further oxidation, the residual flexural strength increased with the further increase of temperature difference from 900°C to 1100°C. Finally, when the temperature differences were above 1100°C, the residual flexural strength gradually decreased with increasing temperature difference, which was attributed to the further oxidation and large thermal stress damage. And the thermal shock resistance of the porous BN/Si₂N₂O ceramic can be improved by the introduction of high contents of sintering aids and h‐BN.     

高抗热震性红外辐射涂料的实验研究

针对红外辐射涂料在不同基体表面上应用时出现的涂层易脱落问题 ,采用正交实验设计对不同配方的过渡金属氧化物系红外辐射涂料进行了涂层高温抗热震性实验研究。优化配方制得的红外辐射涂料既适用于 1Cr18Ni9Ti金属基体又适用于耐火材料基体 ;与国外相关产品相比 ,其抗热震性能更佳。     

The enhanced thermal shock resistance and combustion efficiency of SiC reticulated porous ceramics via the construction of multi-layer coating

SiC reticulated porous ceramic (SRPC) as the key component determined the service life and combustion characteristics of porous burner. The novel multi-layer struts were constructed to synergistically improve the oxidation resistance and infrared radiation of SRPC, including microporous cordierite coating, dense mullite transition layer, SiC skeleton and filling layer. The continuous mullite transition layer significantly improved the resistance to water vapor oxidation of SRPC, also their strength and thermal shock resistance were enhanced because the elimination of strut defects in multi-layer struts. In addition, the microporous cordierite coating generated from the burnt out of pitch increased the burner surface temperature from 764.4 °C to 1061.7 °C, and obviously reduced the CO/NOx emission due to its improved infrared radiation property. Furthermore, the porous cordierite coating enhanced the heat radiation of SRPC, thus increasing the heating rate of the burner from 29.4 °C/min to 33.1 °C/min in the process of water heating.     

铜基表面陶瓷涂层的制备与耐蚀性能研究

以Al2O3、TiO2和ZnO为骨料,钠水玻璃为粘接剂,在纯铜表面用热化学反应法制备了陶瓷涂层。X射线分析发现,陶瓷涂层热固化后,涂层内产生了NiAl2O4、Al2SiO5等新相,它提高了涂层与基体的结合强度。腐蚀实验表明,封孔后陶瓷涂层的耐酸、耐碱、耐盐等性能分别比纯铜基体提高了3.9、12.3和6.3倍;极化曲线表明,陶瓷涂层有明显的钝化区,其抗电化学腐蚀能力增强,抗盐雾腐蚀性比基体提高了5.0倍。