共查询到19条相似文献,搜索用时 62 毫秒
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以刚玉粉、锆英石粉、SiO2微粉、聚乙烯亚胺(PEI)等为主要原料,以孔数(PPI)为10~15的软质聚氨酯泡沫为载体,采用有机泡沫浸渍法于1400℃6h烧后制备了锆刚玉-莫来石质泡沫陶瓷过滤器,分别研究了聚乙烯亚胺、锆英石和SiO2微粉的加入量对浆料稳定性、过滤器强度和抗热震性的影响。结果表明:当聚乙烯亚胺加入量为0.08%(质量分数,下同),锆英石加入量为20%,SiO2微粉加入量为3%时,采用合适的工艺可制备出气孔率大,强度高,抗热震性好的锆刚玉-莫来石质泡沫陶瓷材料。其具体性能指标为:气孔率83%,耐压强度2.4MPa,抗折强度为1.3MPa,抗热震性达6次。 相似文献
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锆刚玉莫来石-碳化硅复合材料的显微结构 总被引:7,自引:0,他引:7
采用OM、SEM、TEM及EDAX等手段研究了锆刚玉莫来石-碳化硅复合材料的显微结构。结果表明,ZrO_2及SiC均匀地分散于刚玉/莫来石构成的基质中。刚玉-刚玉(或莫来石)及莫来石-莫来石的晶间表面多数存在非晶质薄膜,但也有刚玉-莫来石两相直接结合的相界因扩散而形成固溶层。ZrO_2-刚玉(或莫来石)及SiC-刚玉(或莫来石)的相表面因相间扩散形成固溶层或扩散层而皆属直接结合。在刚玉和莫来石晶体里观察到有晶内ZrO_2存在,其形成原因可能是在烧结过程中,刚玉或莫来石晶体再结晶长大而包裹ZrO_2微粒所致。 相似文献
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锆刚玉—莫来石泡沫陶瓷过滤器的研究及应用 总被引:2,自引:0,他引:2
以氧化铝粉和锆英石粉为原料,通过反应烧结制成了锆刚玉-莫来石泡沫陶瓷过滤器,研究了锆英石对抗弯强放抗热震性的影响,对球墨铸铁和铸钢的过滤试验结果表明,过滤后的夹杂物减少,冲击韧性明显提高。 相似文献
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在吹氧转炉车间,采用移动式混铁炉运送铁水。俄罗斯使用的混铁炉有容积150t、420t和600t。混铁炉内衬的寿命不高,一般一个炉役可运铁水390~540次。为节约动力燃料、原料和劳力,以及为改善劳动条件,制定了能保证混铁炉内衬寿命达800次以上的耐火材料的生产工艺。 相似文献
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以电熔白刚玉、电熔莫来石、氧化铝微粉、二氧化硅微粉和硅溶胶为主要原料,制备了硅溶胶、二氧化硅微粉结合刚玉浇注料以及硅溶胶结合刚玉-莫来石浇注料,研究了不同温度处理后浇注料的常温性能、冷态和热态抗折强度以及弹性模量等性能,并进行了差热、X射线衍射和显微结构分析。研究结果表明:1)与二氧化硅微粉相比,硅溶胶能够显著提高浇注料800℃以下的抗折强度;硅溶胶结合和二氧化硅微粉结合的机制以及随温度变化的规律基本一致。2)高温下刚玉骨料中β-Al2O3分解产生的Na2O大部分进入液相,使液相中Na2O含量增加,不利于浇注料中原位生成莫来石,并降低材料的高温强度。3)莫来石加入到硅溶胶结合刚玉浇注料中,能显著降低浇注料的弹性模量,借助于高温下液相的传质作用,莫来石彼此连接形成网络,从而增加了浇注料的强度。 相似文献
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通过对泡沫陶瓷的研究,制备出了以刚玉-莫来石为主晶相,相对密度为0.3 ̄1、气孔率为80% ̄90%的泡沫陶瓷。经过配方及工艺设计,基本掌握了该系材料具有良好的网络结构及强度,证实了添加MgO-ZrO2对该系材料的增强作用。 相似文献
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《Ceramics International》2020,46(10):15935-15942
In the present study, the effect of silica nanoparticles on the formation of nano-mullite phase for use in the manufacture of silicon carbide based ceramic foam filters has been investigated. Polyurethane foam filters were impregnated with nanosilica particles by slip casting. In this method, the effect of different percentages of nanosilica particles in the slurry on compressive strength, density and porosity of ceramic foam filters was investigated. The effect of silica nanoparticles on viscosity of slurry was studied using rheometric test. So, sample S15 was selected to proceed. For thermal treatment of ceramic foams, different sintering temperatures were investigated and the best temperature was reported at 1250 °C. Compressive strength results showed that with increasing nano-silica content, CCS increased. XRD results from the samples showed that the nano-mullite phase was formed at 1250 °C along with silicon carbide and alumina phases. Scanning electron microscope images (SEM) showed that the mullite phase was formed in nano-dimensions in ceramic foam bodies. The formation of mullite phase in the microstructure of the filters is one of the factors of strengthening and increased refractory characteristics. EDS analysis by the scanning electron microscopy of the filter which passed ductile iron melt showed that cast iron inclusions and impurities were mostly consisted from FeO, MnO, SiO2, Al2O3, MgO and CO, which were trapped inside the ceramic filter. 相似文献
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莫来石——刚玉质高温陶瓷辊棒的研制 总被引:2,自引:0,他引:2
通过对国外几种高温陶瓷辊棒组成,显微结构与性能的分析,研究了辊棒的化学--矿物为微结构与性能的关系。采用国产高纯原料及自行研制的高压液压挤 和全自动、大容积高温梭式窑,研制成功了高温力学性能、抗热震性能优良的高温陶瓷辊棒,其主要技术性能达到国外同类产品水平,可以满足烧成温度在1200 ̄1300℃的高温辊道窑的使用要求。 相似文献
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S. B. Hanna F. F. Abdel-Mohsen 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》1985,35(6):285-290
A beta-silicon carbide powder with a surface area of 30m2g?l and a mean particle size of < 1μm was produced from the thermal conversion of silicon resin in an atmosphere of hydrogen. The amount of product increased with increasing iron content (0–2.1 wt%) and firing temperature (1200–1500°C). Chemical analysis, X-ray diffraction and i.r. absorption spectrometry were used to follow the conversion reaction. 相似文献