共查询到20条相似文献,搜索用时 187 毫秒
1.
溶液浸渍法提高石墨材料抗氧化性能研究 总被引:1,自引:1,他引:1
以硼酸盐、磷酸盐和复合盐三种浸渍剂对石墨材料进行了溶液浸渍法研究,研究结果表明:经溶液浸渍法处理的石墨材料氧化失重率降低,石墨抗氧化性能明显提高。溶液浸渍法是改善石墨材料抗氧化性能的有效途径。 相似文献
2.
3.
研究了硼酸-硫酸铝-白炭黑复合体系浸渍剂对炭电极材料抗氧化性能的影响。首先用单种不同浓度的浸渍剂(硼酸、硫酸铝和白炭黑)处理碳电极样品,在800℃静态空气下进行氧化失重实验,考察上述浸渍剂的含量对炭电极氧化失重率的影响。结果显示,随着硼酸浓度的增加,炭电极的失重率基本上呈下降趋势,浓度大于4%后减少变弱;随着硫酸铝浓度的增加,炭电极的失重率先减小后增大,浓度为6%最好;随着白炭黑浓度的增加,炭电极的失重率亦先减小后增大,以浓度为1%最佳;然后基于上述结果,进行配方正交实验设计,采用三因素四水平正交设计方案,通过极差计算对正交实验结果进行分析,确定最佳配方为硼酸、硫酸铝、白炭黑配比为5∶4∶1。最后,实验研究了浸渍次数对炭电极材料的抗氧化性能的影响。此外对炭电极抗氧化机理进行初步分析。 相似文献
4.
5.
6.
7.
抗氧化炭石墨材料的研究及高温氧化行为 总被引:6,自引:3,他引:3
采用了改善炭石墨材料基体抗氧化性能和用磷酸无机高分子复合盐处理后的内外结合的方法制备了一种抗氧化炭石墨材料。这种材料的特点是保持着炭石墨材料基体的特性如自润滑性,耐磨性、硬度、强度等,适用于高温富氧条件下长时间工作的动密封材料。参照ASTM─1179—91测试了650℃下空气中100小时的氧化失重。其氧化行为的分析结果表明,这种抗氧化石墨材料在650℃下空气中氧化失重达5%的时间为65小时,此时的氧化速率为4.4mg/g·hr。氧化60小时以后,氧化失重速率随时间的延长而迅速增加,出现了一个转折点。 相似文献
8.
浸渍法提高石墨材料抗氧化性能的研究 总被引:1,自引:0,他引:1
用磷酸复合盐浸渍法对石墨材料进行浸渍,研究其抗氧化性.讨论了当浸渍剂中添加不同比例的硼酸盐、碳化硅、二氧化钛等成分后,对提高浸渍效果和增强抗氧化性的影响.结果显示,在磷酸和氢氧化铝的摩尔比为25:1,硼酸盐含量为4%,碳化硅(或二氧化钛)含量为2%的条件下,在石墨表面形成白色的偏铝酸盐硬壳具有良好的抗氧化作用.而不加入硼酸盐的浸渍剂,抗氧化效果明显降低.结果表明,石墨材料经过复合磷酸盐溶液的浸渍和热处理,可在表面形成抗氧化层,增强石墨材料的抗氧化性,延长使用寿命. 相似文献
9.
难熔金属炭化物改性基体对炭/炭复合材料抗氧化性能的影响 总被引:3,自引:0,他引:3
主要对难熔金属改性炭基体的炭/炭复合材料的抗氧化性能进行了较深入的研究。实验的结果表明,在以中间相沥青为基体先驱体、以PAN—CF为增强体的炭/炭复合材料中,采用Ti、W、Zr、Ta、等过渡区金属化合物为添加剂,以Co、Ni为助液相烧结剂,以TiCl4、ZrOCl2等为助炭化剂,通过在材料的内部生成多元金属炭化物,形成一种内部的多层次梯度防护体系,较大幅度地提高了炭/炭材料的抗氧化性能,实现了在改性剂添加量2%-3%的情况下,炭/炭材料氧化失重率下降超过80%,在1100℃小情况下,材料氧化失重小于5%的良好效果。 相似文献
10.
抗氧化浸渍石墨材料的研制及其性能考察 总被引:2,自引:1,他引:1
采用真空溶液浸渍法研制出具有抗氧化性能的浸渍石墨材料,并对浸渍工艺条件进行了优化。同空白试样相比,浸渍材料的机械强度明显增加,气孔率大大降低,体积密度增大,电阻率有所下降,在相同氧化条件下的抗氧化性能有显著提高。 相似文献
11.
《Carbon》2014
Small angle X-ray scattering (SAXS) and powder X-ray diffraction (XRD) measurements were made on CuO-impregnated activated carbons, prepared with and without an HNO3 co-impregnant, in order to determine the effect of impregnant loading and HNO3 content on impregnant distribution. A comprehensive matrix of 30 CuO-impregnated samples with five HNO3 concentrations and six impregnant loadings was prepared and studied. As a highlight, in Cu-based samples prepared with no HNO3, relatively small particle size CuO impregnant (approximately 3 nm) was observed at low impregnant loading and additional CuO appeared in large particles (>10 nm diameter) in meso and macropores as the impregnant loading increased. By contrast, when 4 M HNO3 was present during the impregnation, the largest impregnant particles found were less than 4 nm. Results from SAXS data were shown to be in good agreement with XRD and data obtained from nitrogen gas adsorption isotherms. The combination of SAXS and XRD is shown to be a powerful combination in elucidating the nanostructure of impregnated activated carbons. 相似文献
12.
研究了不同金属盐溶液浸渍改性的球形活性炭对氨气的吸附性能以及同种浸渍剂的最佳浸渍比。采用扫描电镜、透射电镜、X射线衍射仪、康塔吸附仪探究了不同浸渍比对浸渍炭样品的表面形貌、物相结构及孔径分布的影响。通过固定床吸附装置对基炭和浸渍炭进行了氨气吸附性能的研究。结果表明:浸渍剂种类对氨气吸附效果有很大影响, 同等浸渍条件下, 氯化钴浸渍的活性炭具有最优氨气吸附效果, 氯化钴浸渍比为50%的样品对氨气的吸附量最高, 可达54.05 mg/mL, 为基炭的37倍。对吸附氨气后样品的物化性质进行分析以及程序升温脱附表征, 结果表明氯化钴与氨气反应生成了[Co(NH3)6]Cl3。 相似文献
13.
分别选取1~0 mm粗结构、0.5~0 mm中粗结构和0.15~0 mm细结构3种粒级煅烧石油焦作为骨料,以中温煤沥青作为黏结剂和浸渍剂,制备出冶炼石英坩埚用高纯石墨材料.研究了不同粒级骨料对高纯石墨材料性能和显微结构的影响.研究表明:0.15~0 mm细结构样品的机械性能最好,1~0 mm粗结构的最差.X射线衍射(XRD)和扫描电镜(SEM)分析结果显示,1~0mm粗结构样品的石墨化程度不如0.5~0 mm中粗结构和0.15~0 mm细结构样品.综合热分析(TG-DSC)结果表明,1~0 mm粗结构样品的热失重温度区间主要集中在680~880℃,其抗氧化能力相对较差. 相似文献
14.
15.
17.
The lifetime of graphite anodes in sulphuric acid media can be increased by a factor of 3.2 by multiple impregnation with coal tar pitch. For single impregnation, linseed oil yielded the largest improvement. The results were interpreted on the premise that properties such as viscosity, melting point and coking value determine the effectiveness of the impregnant. The proper selection of the impregnant and procedure of impregnation is dependent on the electrolysis temperature. 相似文献
18.
浸渍活性炭脱除低浓度H_2S的研究 总被引:9,自引:1,他引:9
应用正交实验法研究了活性炭种类、改性剂、添加剂种类、改性剂及添加剂组成等五种因素对改性活性炭脱硫效果的影响,结果表明活性炭和改性剂种类是决定改性活性炭硫容量的关键因素。最优的改性活性炭脱硫剂组成是ZL-30B活性炭担载6%的Na2CO3改性剂,并以0.1%的TS3作为添加剂,这样制得的改性活性炭硫容量可达53%以上。 相似文献
19.
A set of samples, including active carbon and ASC-whetlerites, both in their original form and after extraction, all with an identical carbonaceous skeleton, was investigated to specify the porous structure and the deposition of the impregnant. Mercury porosimetry and adsorption of nitrogen and carbon dioxide were used for this purpose. The thickness of the deposited layer increases with pore radius. In macropores of r ~ 1000 nm with the largest relative frequency, the thickness of the impregnant is about 120 nm. The deposit may somewhat remove unevenness in the pore walls, but, on the other hand, it creates a secondary pore structure in macropores, where the thickness of the deposit is high enough. Also a partial clogging of small pores takes place. 相似文献
20.
Possible causes of instability of sulfur-impregnated bodies (porous glass and portland cement) have been investigated. As they are non-crystalline and have a large surface-to-volume ratio, impregnants in small pores are normally in a metastable state unless their free energy is lowered by meniscus effects or interaction with the matrix. Extrusion of sulfur on exposure to water or other adsorbing vapors occurs because of the weak interaction between impregnant and the siliceous surface and a lubricating effect created by the presence of the adsorbate on the surface of the impregnant. Non-isotropic expansion and impregnant-adsorbate interaction are suggested as the main causes of mechanical breakdown. Good interaction with the surface and resistance to flow due to cross-linking render polymethyl methacrylate a stable impregnant. 相似文献