共查询到19条相似文献,搜索用时 62 毫秒
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氧化物-非氧化物复合耐火材料高温性能的研究 总被引:9,自引:4,他引:5
对氧化物-非氧化物复合材料(如ZCM-SiC,ZCM-BN,O’-Sialon-ZrO2,β-Sialon-Al2O3等)的高温性能(强度、抗热震性、抗氧化性等)进行了研究。结果表明(1)所研究的氧化物-非氧化物复合材料的高温强度明显优于碳结合材料的高温强度。(2)在氧化物基质中引入非氧化物,可提高材料的抗热震性。(3)在非氧化物基质中引入氧化物可明显改善材料的抗氧化性。 相似文献
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为适应环保的要求,开发了不烧的无铬碱性耐火材料,主要用于低温冶金炉中。所开发的铝镁尖晶石-锡石质浇注料具有良好的性能,在炼铜生产中可以合理地选用。 相似文献
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论述了氧化物与非氧化物复合材料体系的研究成果及新方法。研究表明,锆刚玉莫来石与非氧化物复合材料是有发展前途的高性能耐火材料。化学热力学、统计模式识别和分形理论是用于复合耐火材料研究的新方法。 相似文献
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李勇闫明伟秦海霞龙梦龙仝尚好李玲孙加林薛文东 《硅酸盐学报》2017,(9):1231-1239
SiAlON较Si_3N_4具有更好的高温稳定性,在炼铁体系具有更好的实用性;MgAlON比AlON低温稳定性好,是洁净钢、精品钢等炼钢体系用耐火材料;Al_4O_4C和Al_2OC是树脂结合Al-Al_2O_3系耐火材料高温增强相,具有无铬、低碳环保特点,用于连铸功能耐火材料具有很好的使用效果。基于此,介绍了Si-N-O、Si-Al-O-N、Mg-Al-O-N和Al-Si-C-O-N系结合相复合材料等的应用研究现状,展望了其发展前景。 相似文献
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镁碳耐火材料是目前钢铁工业的适用耐火材料。因此,表征它的物理、化学特性是预计其使用寿命的关键。提出了全面分析和表征这种材料的方法。通常,镁碳耐火材料包含元素相(碳、硅和铝)、非氧化物相、氧化物相(SiC、MgO和Al2O3)、有机相(结合剂)、各种添加剂和杂质。所以,这种材料的化学表征是非常困难的,通常需要将以下分析技术联合使用:X射线衍射,各种热分析和热重分析,电感耦合等离子光谱(ICP—AES),比重分析和C/S元素分析仪(LECO)。将不同分析手段获得的数据综合并用有效的方法处理。各种元素的分析结果和每一种定量分析方法的精度都是比较准确的。 相似文献
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非氧化物复合耐火材料的热力学性能 总被引:3,自引:0,他引:3
为了在耐火材料中能动地应用非氧化物,系统了解非氧化物的热力学性质是非常必要的。为此,首分析了非氧化物在氧化气氛下的不稳定性及顺序,并就如何转变这个不利的性质,以实现在氧化气氛下烧结非氧化物复合材料而提出了“逆反应烧结”工艺。在深入研究Si、Al系氮化物的氧化机理后发现,当氧分压低于“转换氧分压”时,可显著生成其气态的亚氧化物。亚氧化物可以在邻近表面层沉积,形成致密层。致密层的形成使材料具有“自阻碍氧化”的性能。Si、Al的加入可增加亚氧化物的含量,从而加厚、加宽致密层,使材料的抗氧化和抗侵蚀能力得到提高。文中详述了Si3N4 -Al2O3、Si3N4 -MgO和Si3N4 -SiC三个体系的研究情况。结果表明:逆反应烧结工艺可制备出性能良好的复合物;Si、Al除可促进烧结外,还能提高致密层的密度和宽度。 相似文献
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自主创新,发展新型优质耐火材料 总被引:5,自引:5,他引:5
讨论了今后我国耐火材料品种、结构、调整、升级的问题,应当以自主创新为主旋律,充分利用资源优势发展有自己特色的新型质合成原料和高效制品,还介绍了近两三年来这方面的一些科技成果。 相似文献
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介绍了水泥预分解窑的工作条件及其对窑衬耐火材料的影响 ,论述了目前世界水泥预分解窑的技术进展及其对窑用碱性耐火材料的要求 ,以及窑用碱性耐火材料的技术进展 ,分析了我国预分解窑生产技术的发展及预分解窑用耐火材料的发展 ,指出了中国预分解窑用耐火材料近期的发展趋势 相似文献
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ZHONGXiangchong 《中国耐火材料》2002,11(3):3-13
It is expected that in the new century, to cope with developments of new high temperature technologies, a new generation of high performance refractory ceramics will emerge and flourish which should include the following (1) oxide and nonoxide composites characterized by a unique combination of high hot strength, high thermal shock resistance and high corrosion resistance;(2) free CaO bearing basic refractories capable of purifying molten metal for improving cleanliness and of absorbing contaminants from waste gases for reducing environmental pollution;(3) free flowing zero cement castables with improved thermomechanical properties, thermal shock resistance and corrosion resistance and gradient castables with varying matrix composition and varying texture. 相似文献
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设计一种聚甲基丙烯酸-丙烯酰胺-乙烯基磺酸钠型(AMS型)高性能混凝土外加剂,研究了引发剂、分子量调节剂、羧基、酰胺基、磺酸基含量对AMS型高性能外加剂的固含量、转化率、溶液粘度及分散性的影响。结果表明:随着羧基、磺酸基含量增大,酰胺基含量减小,外加剂的单体转化率增大;随羧基、酰胺基含量增大,外加剂溶液粘度增大;在该研究条件下,AMS型高性能外加剂具有稳定优异的分散性能,且原料来源易得,条件易控,转化率高。 相似文献
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《Journal of the European Ceramic Society》2019,39(14):4184-4188
CaMnO3–based materials represent a promising family of n-type oxide thermoelectrics. The objective of the present work is assessing the impacts on relevant structural, microstructural and thermoelectric properties of manganites when they are processed by the laser floating zone technique. For this purpose, donor-doped Ca0.9La0.1MnO3, CaMn0.95Nb0.05O3 and undoped CaMnO3 were used. Different growth conditions have been evaluated through combined studies of structural, microstructural, and thermoelectric characteristics. Despite the presence of secondary phases, electrical resistivity is among the best reported in the literature (9 mΩ.cm at 800 °C for La-doped materials grown at 200 mm/h). Essentially high absolute Seebeck coefficient of 320 μV/K at 800 °C was observed for undoped samples grown at 10 mm/h. Power factor is significantly affected by the growth conditions, reaching the highest values when using the lowest pulling rates. Exceptionally high PF (0.39 mW/K2m at 800 °C) was obtained for undoped CaMnO3 samples grown at 10 mm/h. 相似文献
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矾土基耐火材料的研究与发展 总被引:4,自引:6,他引:4
简要总结了近年来在实验室进行的有关我国水铝石-高岭石型(DK)高铝矾土的研究工作,主要包括显微结构和高温机械性能的系统研究以及加入一些氧化物(K2O、CaO、TiO2、Fe2O3、MgO、锆英石等)的影响。根据这些应用基础研究结呆开发的矾土基高效耐火制品,在高温领域使用,取得良好成效,并显示出乐观的前景。 相似文献
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以煅烧二级矾土熟料为集料,合成莫来石、白刚玉粉、SiO2微粉、Al2O3微粉为粉料,两种纯铝酸钙水泥为结合剂(加入量5%-7%),复合聚磷酸盐作分散剂,研制出高强度莫来石基质浇注料。经1550℃,3h热处理后,浇注料的体积密度为2.428/cm3,耐压强度达87.7MPa,烧后线变化率+0.15%,抗铁法侵蚀性、抗剥落性良好。用于武钢4#取向硅钢加热炉的步进梁、固定梁和立柱上,寿命比原CM16C浇注料高2.5倍。 相似文献
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A new technique for preparing ceramics for catalyst support exhibiting high porosity and high heat resistance 总被引:2,自引:0,他引:2
Toshiyuki Yokota Yasuyuki Takahata Tetsuo Katsuyama Yoshihiro Matsuda 《Catalysis Today》2001,69(1-4):11-15
A new technique for preparing magnesia ceramics of high porosity and high temperature resistance has been developed. Spray freeze drying of magnesium sulfate aqueous solution produced fine salt particles having open pores due to sublimation of ice crystals. The particles were calcined to porous magnesium oxide and formed a green body. Highly porous magnesia was produced by firing the green body. The porous magnesia exhibited a bimodal pore size distribution of macro-pores of micron order and meso-pores smaller than 100 nm. Porosity was 87–90%. After addition of an aluminum additive with an amount 3–5 mol%, the magnesia exhibited high heat resistance; surface area was greater than 20 m2 g−1 after 20 h exposure in a 1573 K oven. Thus, the porous magnesia is expected to be very suitable for combustion catalyst support used in a high temperature environment. 相似文献
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《Journal of the European Ceramic Society》2020,40(13):4655-4663
As a figure-of-merit, the rising ratio of crack propagation resistance to fracture initiation resistance indicates a reduction of the brittleness and enhances the thermal shock resistance of ordinary refractory ceramics. The significant nonlinear fracture behaviour is related to the development of a fracture process zone (FPZ). The universal dimensionless load–displacement diagram method is applied as a promising graphical method for the determination of R-curves for magnesia refractories showing different brittleness. By applying digital image correlation (DIC) together with the graphical method, the problems arisen with accurate determination of the fracture initiation resistance and the crack length are overcome. Meanwhile, the R-curve is subdivided with respect to the fracture processes, viz the fracture initiation, the development of FPZ and the onset of traction free macro-crack. With the simultaneous crack lengths evaluated from DIC, the contribution of each fracture process to the crack propagation resistance at certain loading stage is quantitatively presented. 相似文献