【摘 要】
：
MoSi2-borosilicate glass coating with MoSi2 as emittance agent was prepared on mullite fibrous ceramics for enhanced superficial infrared radiation via an in-situ reaction method.The phase and structu
【机 构】
：
School of Materials Science and Engineering,Key Lab of Advanced Ceramics and Machining Technology of
论文部分内容阅读
MoSi2-borosilicate glass coating with MoSi2 as emittance agent was prepared on mullite fibrous ceramics for enhanced superficial infrared radiation via an in-situ reaction method.The phase and structure evolutions during sintering were studied in detail.The infrared radiatingproperty,impact resistance,thermal shock resistance and thermal endurance of the coating were investigated comprehensively.The results show that the coating was dense and flat,and it tightly adhered to the substrate by mechanical interlocking.During the sintering process,the low-temperature oxidation of MoSi2 was restrained due to the package of binder phase formed below 500oC,and the coating was fully densified via the viscous flow of molten Si.The total emissivity of the as-prepared coating was higher than 0.85 and the emissivity at low wavelength was higher than 0.9.The impact resistance was preferable attributed to the reinforced transition layer at the interface.The coating went through 30 thermal cycles between 1500oC and 25oC without cracking and spalling.The total emissivity declined merely by 4%after oxidation at 1500oC for 50 h,whichwas influenced by the MoSi2 content and the surface roughness of the coating.
其他文献
本文以造纸污泥为原料,辅以黏土和粉煤灰进行配料,制备出了500-1000密度等级污泥陶粒,并对其力学性能和微观形貌进行了表征.结果发现:(1)添加少量造纸污泥,可以制备出性能优异的低密度等级污泥陶粒,随着造纸污泥掺量的提高,陶粒的堆积密度逐渐升高.(2)陶粒矿物成分中钙长石的含量与造纸污泥的掺量成正比.(3)添加少量造纸污泥,陶粒内部平均孔径变大,随着造纸污泥掺量的提高,平均孔径逐渐变小.
将垃圾焚烧飞灰作为原料投加到水泥生存工艺中,可以替代部分水泥原料,有效去除或稀释飞灰中富集的二噁英等有机污染物,最终实现飞灰的资源化处置的过程就是水泥窑协同处置飞灰.由于飞灰中存在大量的氯和重金属,因此必须有效避免飞灰对水泥生产和产品质量的影响.目前,随着我国垃圾焚烧飞灰处置需求的不断增加,水泥窑协同处置飞灰技术越来越受到重视.
以利用轮窑及烧结制品余热煅烧脱硫石膏制备的建筑石膏为主要原料,通过掺加粉煤灰、水泥、矿渣粉掺和料后,在石灰的激发下制备石膏基胶凝材料及制品.利用正交试验研究了各掺加料对胶凝材料强度的影响,研究了制备石膏砌块的可行性,并通过XRD和SEM分析了改善胶凝材料强度的机理.结果表明,粉煤灰和矿渣粉的掺加量是影响胶凝材料强度的关键因素;以建筑石膏75.0％、粉煤灰12.0％、矿渣粉3.0％、水泥7.0％、石
粉煤灰在水泥中已被广泛应用,对于添加干粉煤灰的水泥立磨,通过实验室半工业化立磨和工业化生产的分析,得到如下结论:在水泥立磨粉磨中,掺入低于40％的干粉煤灰,每增加1％,粉磨电耗降低0.16kWh/t,可作为选型设计参考;每增加1％的干粉煤灰,产品比表面积会有不同程度的增加.
Novel plastic deformation was exhibited in amorphous oxides,attributed to the metastable state of amorphous phase with free volume and disordering structure;however,metastable degrees can be quite dif
Directional ice-templated ceramics have unique lamellar porous channels between ceramic walls which run from bottom to top of the samples.This highly oriented morphology results in the anisotropy in m
印尼海德堡P14项目烧成系统采用了国产化的万吨级预分解系统和万吨级回转窑.针对印尼当地高水分原料和高水分褐煤的特点,对预热器、分解炉、回转窑等设备进行了优化设计.实际运行结果反馈,烧成系统能耗指标和环保指标均达到同规模生产线的先进水平,顺利通过性能考核.
Silica sol is one of the frequently-used binders in high-temperature resistingfibrous porous ceramics,but in the drying process,it can diffuse with water and influencethe uniformity of ceramics.To sol
The influences of different fibers and F ions on the formation mechanism of hierarchical structure were investigated.This study was undertaken to better understand how fibers affect the growth of mull
A room temperature curable heat-resistant adhesive with broad working temperature rangewas prepared through organic and inorganic modification.The preceramic polymethylsiloxane showedlow bonding stren