高合金铁基烧结材料在轧钢导位中的应用研究

本文研究了高合金铁基烧结材料在轧钢导位中的应用。实验表明,通过粉末冶金液相烧结技术,可以获得具有优良综合性能的制品,材料密度ρ≥7.5 g/cm3,硬度≥55 HRC,抗弯强度≥1 000 MPa,冲击韧度αk≥3.9 J/cm2,满足了轧钢导位辊的工作要求。材料利用率可达95%以上、降低了制备成本。使用寿命是普通轧辊寿命的3~6倍,适用于线材和小型型材的轧钢生产。     

Development of sealing compositions with nanostructure iron-based fillers

The possibility of utilizing nanopowders of iron and Fe-Co-Ni produced bu a thermochemical method in the fabrication of sealing composition materials is investigated. It is established that such hermetic sealing composition materials function reliably under extremal conditions and guarantee elevated strength of adhesion to the surface of the metal and high corrosion and temperature stability. __________ Translated from Poroshkaya Metallurgiya, Nos. 3–4(448), pp. 112–117, March–April, 2006.     

Vinyl acetate monomer—a pilot plant study

The kinetics of the reaction of acetic acid and acetylene over zinc acetate-activated carbon catalyst was investigated over a wide range of process variables in a pilot reactor. Although various catalytic reaction mechanisms were postulated, the rate of reaction was most satisfactorily correlated by a mechanism of surface reaction between charged adsorbed acetic acid and acetylene, which assumes that the rate controlling step was the irreversible charged adsorption of acetylene and acetic acid.     

Synthesis and characterisation of a submicrometre silicon carbide powder

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.     

超细氧化锌粉体的制备及尺寸控制

根据气相化学反应法 (CAD)制备超细粉的原理 ,从低品位氧化锌矿中采用火法冶金方法直接制备超细氧化锌粉 ,对所得氧化锌的粒度尺寸、微观结构和粒度分布进行测试 ;考察了冷却强度以及收集装置对超细氧化锌粒度及粒度分布的影响 ;讨论了氧化锌粉体团聚的原因及对策、试验条件对氧化锌尺寸的控制等     

土壤固化剂无侧限抗压强度试验研究

针对山西省长治市石子河河道处理问题 ,采用固化剂粘土进行了无侧限抗压强度试验 ,并与水泥土进行了比较。发现固化剂 2的无侧限抗压试验强度最佳 ,为工地现场试验及河道综合治理提供了更为有力的理论依据     

水平浓缩燃烧器在65t/h煤粉炉上的应用

介绍65t/h煤粉炉的基本概况和存在的问题，详细阐述了采用水平浓缩煤粉燃烧技术对原燃烧器的改造过程，对改造前后运行参数及经济效益进行了对比。     

盛钢桶铝锆碳滑板的研究与生产

通过研究,在盛钢桶用铝锆碳滑板的生产过程中,调整了ZrO2的加入量,添加了复合抗氧化剂,使滑板具用较高的强度和抗氧化性能,提高了滑板的使用寿命.     

莫来石材料的研究现状及其应用

较详细地介绍了莫来石的性能、生产、研究现状和用途。尤其对多元复合莫来石韧性陶瓷及莫来石超细粉末的制备进行了评述,同时展望了莫来石作为高级陶瓷材料的发展前景。