共查询到19条相似文献,搜索用时 140 毫秒
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对用于浸渍石墨的三种磷酸的浸渍剂的配制,浸渍和热处理工艺以及氧化过程进行了研究,结果表明磷酸盐可明显提高石墨材料的抗氧化性能,经三种浸渍剂处理过的石墨材料分别在700℃,800℃和900℃以下基本不氧化。 相似文献
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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
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浸磷酸盐对碳石墨材料抗氧化性能的改善作用 总被引:2,自引:0,他引:2
对三种不同没渍、热处理方案的磷酸盐石墨材料,分别在不同温度下测定其氧化失重,证明石墨材料没渍磷酸盐后抗氧化性能可得到明显改善,其氧化失重仅为基体材料的1/4~1/6,用磷酸盐浸渍是提高石墨抗氧化性能的一种有效途径。 相似文献
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在提高石墨材料高温抗氧化性能的各种方法中,溶液浸渍法的工艺操作简单,成本相对低廉,保护效果较好,因此选择了磷酸盐溶液作为浸渍液,并按照试样清洗、干燥、加热浸渍、热处理等流程,让石墨材料表面形成抗氧化涂层,同时进行了高温抗氧化实验。实验中探究了浸渍时间、表面活性剂添加量、热处理、热处理终温4个变量对抗氧化性能的影响。结果表明,除了热处理终温这一因素外,其他3个因素对石墨材料的抗氧化性能均有明显影响。其中,浸渍时间为30 min、表面活性剂添加量为8 m L、有热处理的情况下,石墨材料形成的涂层最佳,抗氧化性能最好。 相似文献
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主要介绍了采用浸渍磷酸盐溶液的方法来提高高纯石墨材料抗氧化性的工艺研究和影响因素。结果表明.经过浸渍处理和热处理,石墨材料的初始氧化温度提高300℃,950℃以下基本不氧化。 相似文献
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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
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Improvement on Corrosion Resistance of Zirconia-Graphite Material for Powder Line of SEN 总被引:1,自引:0,他引:1
LIHongxia YANGBin YANGJinsong LIUGuoqi 《中国耐火材料》2003,12(4):3-6
The influence of anti-oxidation additions and microstructure characters of fused zirconia raw materials on the corrosion resistance of ZrO2-C were studied.The results show that BN addition can enhance the corrosion resistance of ZrO2-C due to the prevention of graphite oxidation,and zirconia raw material with good crystallization and densification will give better corrosion resistance by restrain the reaction between slag and zirconia. 相似文献
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综述了三氧化二铝-碳化硅-碳浇注料防氧化技术的防氧化效果以及对材料性能、组成和结构的影响,根据含碳耐火材料的氧化损毁机理,主要分析了防氧化剂的两种作用形式即优先碳源氧化法和优化碳源法。防氧化剂法除了优先碳源氧化生成金属氧化物和碳化物阻止含碳材料的氧化外,还可以通过固相反应生成液相等物质堵塞材料内部气孔提升材料的致密度阻止氧气的进入来提高防氧化效果,优化碳源法则通过复合碳源以及在碳源的表面添加涂层达到一定的防氧化效果。详细阐述了3种方法的工艺特点以及目前存在的问题,并对其发展方向进行了展望,为开发新型三氧化二铝-碳化硅-碳浇注料防氧化技术提供参考。 相似文献
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为抑制铝碳质长水口使用过程中石墨的氧化,其表面会涂覆含20%~30%Al2O3的抗氧化涂层,但切割丝钢等特种钢冶炼过程必须严格控制钢液中夹杂的Al2O3的含量,因此需要制备低氧化铝含量的抗氧化涂层。本文通过调节涂料组成、加水量和水玻璃加入量制备了低铝抗氧化涂层,并利用扫描电镜分析了抗氧化实验后试样断口的显微结构。结果表明:以粘土粉、钾长石粉和硅砂为主要原料,添加10%硼砂的涂料可在800℃形成良好的釉层,此时涂料中Al2O3的含量可降至12%,得到了低铝涂料;当加入占涂料质量80%的水和40%的水玻璃时,涂层具有最佳的涂覆性能和抗氧化性能,涂层和长水口基体结合致密,保护了长水口中的石墨不被氧化。 相似文献
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Yan Jiang Quanxing Ren Hongqiang Ru Zhiliang Mao Haibin Xu 《Ceramics International》2019,45(1):539-549
To improve the oxidation resistance of Si-SiC coating, single-phase ultra-high temperature boride (ZrB2 or TaB2) modified Si-SiC coating was designed and established on graphite substrates by combination of dipping and reactive infiltration process. ZrB2 or TaB2 phase was introduced in Si-SiC coating by directly mixing raw materials and phenol formaldehyde resin in the slurry, and then the ZrB2-SiC-Si and TaB2-SiC-Si coatings were fabricated on the graphite samples by dipping-curing, pyrolysis, and siliconizing. The crystalline phases and microstructure of the as-obtained multiphase coatings were investigated by X-ray diffraction analysis and scanning electron microscopy. The interrupted oxidation tests from room-temperature to 1500?°C were conducted to assess the anti-oxidation property of the prepared coatings. After 1200?h of oxidation at 1500?°C in air (30 times thermal cycles), the mass losses of the graphite substrates coated with ZrB2-SiC-Si and TaB2-SiC-Si coatings were 0.086% and 0.537%, respectively, and the high-temperature stability of the modified coatings was greatly improved compared to the Si-SiC coating. The excellent anti-oxidation performances of the compound coatings were attributed to the compact structure of the coatings and the formation of compound oxide layers covering on the surfaces. The compound Zr-Si-O and Ta-Si-O films possessed low oxygen diffusion rate and appropriate viscosity, which can provide appreciable oxidation protection for the internal coatings, thus obtaining the excellent oxidation and spallation resistance property. 相似文献
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氮化硅对烧成铝炭耐火材料的性能研究 总被引:1,自引:0,他引:1
通过在铝炭耐火材料中引入氮化硅及很细的铝粉,在埋碳烧成过程中氮化硅与碳或与铝反应生成少量赛隆相及碳化硅。适当引入氮化硅,降低了铝炭砖的氧化失重率,提高了其抗脱磷剂侵蚀的能力及砖的抗氧化性能。 相似文献
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Hideki Kita Manabu Fukushima D. Doni Jayaseelan Yu-Ping Zeng Kazuo Ohsumi 《Journal of the American Ceramic Society》2005,88(9):2632-2634
The oxidation resistance and lubricating properties of graphite treated with magnesium phosphate were investigated. Magnesium-phosphate-treated graphite showed improved oxidation resistance. That is, with magnesium-phosphate treatment, the oxidation temperature of graphite increased by almost 200°C. Furthermore, the friction coefficient of magnesium-phosphate-treated graphite measured at 500°C was about 0.05, which was smaller than that measured at room temperature. 相似文献
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Impregnation of graphite with organic phosphate and phosphite esters has been found to result in increased resistance to air oxidation at elevated temperatures. Thermal decomposition of the phosphorus compounds at 200–600°C leaves a hydrophilic residue strongly adsorbed on the graphite surface at active sites where oxidation normally occurs. 相似文献