尖晶石型LiMn2O4陶瓷的制备及其电导率

为研究尖晶石型LiMn2O4正极材料的导电性能,用无压、热压和等离子放电烧结的方法制备出了LiMn2O4陶瓷块体,用X射线衍射(XRD)、扫描电子显微镜(SEM)和交流阻抗谱研究了产物的物相、显微结构和电导率。结果发现,在高温或低氧浓度的烧结条件下LiMn2O4发生脱氧,分解生成LiMnO2和Mn3O4。通过埋粉工艺可以有效地抑制脱氧,提高LiMn2O4的烧结温度。等离子放电烧结可使坯体迅速达到致密,抑制晶格脱氧和晶粒长大。尖晶石型LiMn2O4的电导率由晶界电导控制,晶粒大小对电导率的影响很大。     

烧结矿断面图像分析与操作指导系统

应用图像处理与神经网络技术,根据烧结操作人员对烧结矿FeO含量判断的方法,应用CCD摄像机采集烧结机尾断面图像对其进行实时处理、特征提取,并由根据烧结看火工的经验知识训练的BP神经网络对图像分类辨识,得出相应的FeO、燃料、水份等参数,应用人工智能方法指导生产操作.     

Calculating the Thermal Conductivity of Heated Powder Compacts

This work is devoted to the theoretical understanding of the microstructure and thermal conductivity relationships of compacted ceramic powders in the initial, nondensifying stage of sintering. A model based on surface diffusion of vacancies for the growth of the neck between particles is combined with numerical fully three-dimensional code calculations, which solve for the effective heat conductivity coefficient of lightly sintered particles. The predictions of the model are in agreement with experimental observations. The approach presented can be applied to solve a series of related problems, like dielectric properties, with arbitrary microstructure and multicomponent composite of the powders.     

Densification and Sintering Kinetics in Sintered Silicon Nitride

The sintering sequence of Y₂O₃-Al₂O₃-doped Si₃N₄ was investigated with respect to the relationship between densification, α→β transformation, and microstructural development. Quenching studies were performed to reveal these interactions during a complete sintering cycle. Isothermal studies were conducted to examine the sintering kinetics and compared to Kingery's liquid-phase sintering model. The bulk density increased to ≥90% of theoretical density with only minor transformation taking place. Major transformation occurred in a late sintering stage and was accompanied by the development of elongated grains. The kinetic order of the densification process, taking into account an appropriate correction, was larger than any of the rate exponents predicted by the Kingery model, indicating that other single or mixed mechanisms were active.     

烧结矿成品率控制的价值分析

分析了烧结矿成品率的变化对烧结机生产率、烧结矿固体燃料消耗、点火煤气和电耗等技术经济指标的影响,指出了影响烧结矿成品率的因素及控制措施.分析结果表明,烧结矿成品率是反映烧结过程质量的一项重要指标,在烧结生产过程中,应把其作为一项关键性的工艺指标进行实时控制.     

Effects of Additives on Sintering and Characterization of Calcium Phosphate Ceramics

1Introduction Thenaturalbonemineralhasacomplicatedcomposi tion.Themajorelementsarecalciumandphosphorous.Inaddition,therearelotsofconsiderabletraceelements inbone,whicharehydrogenophosphateions,carbonate ions,sodium,magnesium,potassium,fluorine,chlo rine,a…     

模糊控制在烧结配料自动化控制中的应用

介绍了模糊控制在烧结配料自动化控制中的应用。介绍了系统构成、控制规律,并通过实际应用验证了采用模糊控制后的控制效果,保证物料配比量的准确和稳定,并阻止了下料故障,提高了烧结矿的质量。     

液相烧结对Ba(Ti0.91Zr0.09)O3陶瓷介电性能的影响

采用固相反应法制备了添加1wt%CuO-BaO混合物的Ba(Ti0.91Zr0.09)O3铁电陶瓷,借助XRD、SEM、Agilent4284测试仪,讨论了加入CuO-BaO混合物对Ba(Ti0.91Zr0.09)O3铁电陶瓷的烧结温度、相结构、显微组织及介电性能的影响.结果表明:添加1wt%CuO-BaO混合物,能有效降低Ba(Ti0.91Zr0.09)O3的烧结温度,室温介电常数高,介电损耗小.在1MHZ下εTl=3 150,tgδ=0.06,并且伴有介电弛豫现象.