硫酸钾综合评述

综述了硫酸钾的国内外生产方法、技术状况,并对未来的市场需求进行了预测     

安钢炉卷轧机生产线工艺设计特点

介绍了安钢炉卷轧机生产线的工艺设备情况及主要技术参数，并对其拥有的处于世界先进水平的高效节能步进梁式加热炉、自动化控制系统、温度闭环控制系统等技术及设备进行了阐述。     

陶瓷结合剂CBN砂轮磨削表面粗糙度的试验研究

本文通过一系列的试验，研究了陶瓷结合剂CBN砂轮磨削表面粗糙度的变化规律及其特点，建立了相应磨削表面粗糙度的经验公式。     

大庆石化公司聚烯烃树脂生产现状及发展

介绍了大庆石化公司现有聚烯烃装置的生产状况及聚烯烃新产品的开发．并从工艺角度与国内外同类装置进行了分析对比。最后简要介绍了大庆石化公司未来聚烯烃项目的发展规划。     

丙烯酸树脂复鞣剂在兔皮制革中的应用

本文叙述了丙烯酸树脂复鞣剂的性能,阐释了ART—Ⅰ和ART—Ⅱ复鞣兔皮手套革的工艺操作及其注意的问题。     

Effects of hBN Content on the Microstructure and Properties of Atmospheric Plasma-Sprayed NiCr/Cr<Subscript>3</Subscript>C<Subscript>2</Subscript>-hBN Composite Coatings

NiCr/Cr₃C₂-hBN composite coatings with different contents of hBN were prepared by atmospheric plasma-spray technology. The microstructural, mechanical, and tribological properties of the coatings were systematically investigated. The results show that the flowability and apparent density of NiCr/Cr₃C₂-hBN composite powders, as well as the microhardness and tensile strength of the NiCr/Cr₃C₂-hBN composite coating, gradually decrease with the increase of hBN in the composite powders. The addition of hBN is benefit to the friction coefficient of the coatings, but it is positive to the wear rate. When the content of hBN is up to 20%, the friction coefficient of the composite coating is lowest, but the wear rate of the composite coating is highest.     

The effects of temperature and frequency on the dielectric properties, electromagnetic interference shielding and microwave-absorption of short carbon fiber/silica composites

The dielectric spectroscopy of short carbon fiber/silica composite in the frequency range from 8.2 to 12.4 GHz at temperatures between 30 and 600 °C has been performed. The composite was prepared by conventional ceramic processing. The real part of the permittivity increases with increasing temperature, which is attributed to the shortened relaxation time of electron polarization, and the imaginary part also increases which is ascribed to the increasing electrical conductivity of the carbon fibers. The effect of frequency is found in reflection coefficient and absorption coefficient, and the corresponding mechanisms for the effect are proposed. Results indicate that the composite has good electromagnetic interference shielding property. By calculating the microwave-absorption as a single-layer absorber, we find that the reflection loss varies with the changes of thickness and temperature, due to the deviation of impedance matching condition.     

An activation-free method for preparing microporous carbon by the pyrolysis of poly(vinylidene fluoride)

A simple method for the preparation of microporous carbon was presented by pyrolyzing poly(vinylidene fluoride) (PVDF) at high temperature under N₂ atmosphere without activation or any other additional processes. The yield of PVDF-derived carbon is 35.0%. Its specific surface area reaches 1012 m² g with a pore volume of 0.41 cm³ g⁻¹. The carbon is microporous with unimodal pore size distribution at 0.55 nm.     

The effect of BaZrO3 addition on melt-processed YBa2Cu3O7–x superconductors

The effects of BaZrO₃ addition on the thermal behavior and microstructure of YBCO superconductors have been investigated. The differential thermal analysis indicates that the peritectic decomposition temperature of YBCO precursor powder is not change when BaZrO₃ is doped. The solidification temperature of YBCO changes with increasing of BaZrO₃ addition, thus the window of solidification temperature is affected. The results of scanning electron microscopy show that the BaZrO₃ particles are accumulated along the growth boundary, which result in the constitutional segregation of YBCO. The pushing–trapping theory is used to explain the phenomenon of segregation in the YBCO matrix.