提高中碳锰铁精炼电炉炉龄的实践

通过对精炼电炉炉体改造和出铁口材质、砖型的更新，解决了在中碳锰铁生产过程中炉眼易损问题，提高了炉龄，降低了生产成本。     

镁质瓷泥浆流变性能的改进

滑石质瓷是一种高性能瓷的材料，但由于其泥浆的稠化性及泥料塑性差，阻碍了滑石质瓷的大量生产。实验表明：引入长石作助熔剂并加入适量粘土，可以改进泥料塑性及泥浆流变性能，使烧成变形度小，机械强度提高，能较好地满足制品成型的工艺要求。实验中设计了多组配料，分析比较烧后试样的性能测试结果，确定最佳配方及烧结温度。     

石英砂在菱苦土磨具中的作用机理

本文利用物质结构与化学键的有关理论对石英砂的菱苦土磨具中的作用机理进行分析，并以实验对分析结果进行验证。结果表明：金刚砂晶体中Si-C共价键的离子性百分数仅为9％，石英晶体中Si-O共价键的离子性百分数为47％，因此，石英与主要以离子键结合的菱苦土结合剂之间有较强的静电作用力，石英与菱苦土的结合力强于金刚砂，可提高菱苦土磨具的耐磨性。     

Synthesis and Microstructure of Highly Oriented Lead Titanate Thin Films Prepared by a Sol-Gel Method

Thin films of PbTiO₃ were deposited on fused silica, resistor-grade alumina, and single-crystal (100) MgO by a sol–gel processing method. Whereas the films deposited on silica and alumina substrates were randomly oriented and polycrystalline, highly {100} oriented PbTiO₃ films were grown on the MgO single crystals. The perovskite-type structure was observed with films deposited on the single-crystal MgO and annealed at temperatures as low as 470°C, whereas a pyrochlore-type strcuture was observed with films on fused silica and alumina processed in a similar manner. All films heat-treated at temperatures in excess of 570°C showed significant formation of a second PbTi₃O₇ phase. The films were characterized by electron microscopy and glancing-incidence-angle X-ray diffraction.     

Ketones from carboxylic acids over supported magnesium oxide and related catalysts

Silica-supported alkaline earth oxides revealed excellent activity to convert acetic acid selectively into acetone in a vapor-phase fixed-bed flow system. Acetone was obtained through the cyclic formation of alkaline earth acetate followed by decomposition. Magnesium oxide should be supported on the silica surface without formation of magnesium silicate, which was inactive for the present reaction. Attempted syntheses of benzophenone and acetophenone are also described.     

氯氧镁水泥硬化体胀机理研究

研究了氯氧镁水泥硬化体的胀裂机理。指出欠烧或过烧菱苦土的采用是造成氯氧镁水泥硬化体胀裂的根本原因。采用正火（８５０℃）煅烧的菱苦土，同时氯氧镁水泥的配比和工艺合理，即可制成合格制品，其水化产物是５·１·８相〔５Ｍｇ（ＯＨ）２·ＭｇＣｌ２·８Ｈ２Ｏ〕。     

稀土氧化物对镁质耐火材料物理性能及挂窑皮性的影响

在镁质耐火材料中分别加入Y2O3、La2O3、Nd2O3和CeO24种稀土氧化物,研究添加不同的稀土氧化物对镁质耐火材料的烧结性能、高温力学性能和挂窑皮性的影响。结果表明,所添加的稀土氧化物可以促进镁质耐火材料的烧结,提高其常温力学性能,并且添加Y2O3还能明显提高镁质耐火材料的高温强度和挂窑皮性能。     

假颗粒现象及其对再生铝镁碳制品性能的影响

对用后铝镁碳砖再生颗粒料的组成和结构特点进行显微分析,并通过改变混料方式以及不同粒度再生料的加入量研究假颗粒对再生铝镁碳制品结构与性能的影响。结果表明：用后铝镁碳砖再生料中含有约40%与废砖相组成和结构相似、骨料与基质并存于同一颗粒的二次颗粒,即所谓的＂假颗粒＂,假颗粒的组成、结构及外形的均匀程度均远不如一次骨料颗粒;混碾可使用后铝镁碳砖再生料中假颗粒发生二次破碎,且粒度越大,发生二次破碎的颗粒数量越多;假颗粒二次破碎导致再生制品的粒度组成发生改变,进而影响其密度和耐压强度。     

Study on BSTO/MgO Ferroelectric Materials for Phase Shift Doped with Rare Earth Oxides

Phasedarrayantennascansteerthetransmitted orreceivedsignalswiththeadvantagesoffastscan ning,multipletargetstrackingandgoodanti jam ming.Theseantennasarecurrentlyconstructedusing ferritephaseshiftingelements,whicharecostly,large andheavy.Therefore,theirmil…     

纳米氧化镁粉体制备技术的研究进展

按反应物的状态,纳米氧化镁的制备方法可分为固相法、气相法和液相法,分别评述了这些制备方法的优点和不足,介绍了纳米材料团聚程度的表征方法,从影响团聚的因素如反应原料、反应条件、脱水及干燥方式、煅烧条件和分散剂的选用等方面,较详细地讨论了纳米氧化镁粉体制备过程应采取的防团聚措施,提出了纳米氧化镁材料研究的几点建议。