α—β—Sialon复相陶瓷研究进展

近年来，由于优异的高温性能及性能可设计性、α－β－Ｓｉａｌｏｎ复相陶瓷的研究经入注目。本文对α－β－Ｓｉａｌｏｎ复相陶瓷的相关性、致密化机理、相变、显微结构和力学性能作了全面的分析和阐述，并介绍了α－β－Ｓｉａｌｏｎ复相陶瓷的应用。     

Si_3N_4/BAS复相陶瓷材料制备及其性能EI北大核心CSCD

采用新型冷冻胶凝陶瓷成型技术制备高性能Si_3N_4/BAS复相陶瓷透波材料,对Si_3N_4/BAS复相陶瓷材料烧结体成分、力学性能、微观形貌、电性能及抗热震性等进行研究。结果表明:坯体成型收缩率小于1%,在温度升到1 300℃高温时,Si_3N_4/BAS复相陶瓷烧结体弯曲强度280 MPa,弹性模量为90 GPa,介电常数变化率仅为6%。该复相陶瓷材料具有良好的抗热震性能及可加工性,BAS陶瓷玻璃相高温高黏度特性对Si_3N_4/BAS复相陶瓷材料抗热震是一种热应力缓释方式。     

莫来石—钛酸铝复相陶瓷的高温强度与热分解

本文介绍了莫来石－钛酸铝复相陶瓷的制备工艺及其主要性能，重点对它的高温强度、热分解及抗热震性等进行了讨论并提出了我们的见解。     

莫来石凝胶粉—钛酸铝复相陶瓷的研究

初步研究了莫来石凝胶粉－钛酸铝复相陶瓷的室温与高温强度及抗热震性。结果表明，此复相陶瓷具有较高的室温及高温强度以及良好的抗热震性，室温强度的提高主要是由于莫来石抑制钛酸铝晶粒的生长并阻碍裂纹的扩展，高温强度的提高是由于裂纹弥合的结果。     

原位合成TiB2-SiC基复相陶瓷及其高温摩擦学性能的研究

本研究以SiC为基体，用TiC和B4C为原料，采用新的反应原理生成TiB2，原位合成了TiB2-SiC基复相陶瓷，提高了SiC陶瓷的物理性能和高温摩擦学性能：随着材料中TiB2物相重量百分比的增加，材料的高温摩擦学性能提高。在以下摩擦环境参数下TiB2（wt25％）SiC基复相陶瓷自对偶在空气中高温摩擦磨损性能较好，呈现良好的高温自润滑性能：在升温状态下、空气中、环境温度为200℃-1000℃、外加载荷为0．2MPa、摩擦速度为0．3m／s，温度和外加载荷对TiB2-SiC基复相陶瓷自对偶比磨损率的影响具有依存性。高温摩擦氧化是TiB2-SiC基复相陶瓷自对偶高温磨损主要机理，磨损试样磨损断面包含摩擦氧化层、过渡层和基体亚表面三层。氧化层和过渡层接触紧密；磨屑具有典型包裹结构。     

纳米复相陶瓷

纳米复相陶瓷以其优异的性能受到大家的关注，成为陶瓷研究领域的研究热点。本文在介绍纳米复相陶瓷分类、材料设计和制备的同时，着重阐述了纳米复相陶瓷中纳米颗粒对材料的显微结构和性能的影响。     

α-β-Sialon复相陶瓷研究进展

近年来,由于优异的高温性能及性能可设计性,α－β-Sialofl复相陶瓷的研究引人注目。本文对α－β－sialon复相陶瓷的相关系、致密化机理、相变、显微结构和力学性能作了全面的分析和阐述,并介绍了α－β-Sialon复相陶瓷的应用。     

Al2O3-TiC基复相陶瓷的制备和性能

Al2O3-TiC基复相陶瓷具有高强度、高硬度和较好的高温稳定性,常用于刀具、发热体和电子器件。本文综述了Al2O3-TiC基复相陶瓷的各种制备方法及其优缺点、常温和高温性能、各种增韧手段和增韧机制,并展望了Al2O3-TiC基复相陶瓷研究的发展方向。     

Al2O3–TiC基复相陶瓷的制备和性能

Al2O3-TiC基复相陶瓷具有高强度、高硬度和较好的高温稳定性, 常用于刀具、发热体和电子器件. 本文综述了Al2O3-TiC基复相陶瓷的各种制备方法及其优缺点、常温和高温性能、各种增韧手段和增韧机制, 并展望了Al2O3-TiC基复相陶瓷研究的发展方向.     

AIN在SiC—AIN—Y2O3复相陶瓷中的作用

氮化铝相在ＳｉＣ－ＡＩＮ－Ｙ２Ｏ３复相陶瓷中起着至关重要的作用。在２０５０℃高温时，ＡＩＮ颗粒表面发生固相蒸发现象，并聚集到ＳｉＣ颗粒周围最终形成固溶体，改善了ＳｉＣ颗粒周围最终形成固溶体，改善了ＳｉＣ陶瓷的晶界结构，使该复相材料具有良好的机械性能，其室温抗折强度为６１０ＭＰａ，这一强度可持续至１４００℃高温，断裂韧性达到８．１ＭＰａ．ｍ＾１／２。     

氧化物-非氧化物复合耐火材料高温性能的研究

对氧化物-非氧化物复合材料(如ZCM-SiC,ZCM-BN,O’-Sialon-ZrO2,β-Sialon-Al2O3等)的高温性能(强度、抗热震性、抗氧化性等)进行了研究。结果表明(1)所研究的氧化物-非氧化物复合材料的高温强度明显优于碳结合材料的高温强度。(2)在氧化物基质中引入非氧化物,可提高材料的抗热震性。(3)在非氧化物基质中引入氧化物可明显改善材料的抗氧化性。     

Mechanical and thermal properties of h-BN based composite containing dual glass phases at elevated temperatures

High-temperature mechanical and thermal properties of h-BN based composite containing amorphous silica and Yb-riched silicate glass phases were systematically investigated in this work. Owing to anisotropic microstructure of h-BN matrix, the obtained composite demonstrates anisotropic mechanical and thermal properties. The composite possesses higher elastic modulus at 1673?K than that at room temperature and presents excellent high-temperature stiffness. Flexural strengths in parallel and perpendicular directions reach 496?±?22 and 258?±?21?MPa at?1073?K, respectively, and increases by 74 and 66% compared with the room-temperature strengths of 285?±?4?and 155?±?5?MPa. The composite containing dual glass phases shows lower coefficients of thermal expansion in the temperature range of 473–900?K, the values are ?1.4?×?10^?6 and 0.3?×?10^?6 ?K^?1 for the perpendicular and parallel directions, respectively. Thermal conductivities in the perpendicular and parallel directions at 373?K are 24.8 and 14.8?W?m^?1?K^?1, respectively, and then decrease to 14.9 and 9.3?W?m^?1?K^?1 at 1473?K.     

High-temperature thermal-insulation Tizolit articles

High-temperature thermal insulation Tizolit articles made from mulit-silica fibers are reviewed. The basic stages of the technology are discussed and the values of the physico-technical properties of the articles are presented. The indicators of the properties of Tizolit articles are compared to articles produced by certain Russian and foreign manufacturers of this type of product.     

硫化氢的高温脱除

本文介绍新的高温脱硫剂的研究开发，并对高温条件下硫化氢催化分解，反应 偶联脱除硫化氢，应用膜反应器脱除硫化氢技术以及其它新的脱硫技术的发展进行了回顾。     

Physico-chemical properties of ceramic pigments for high-temperature application

Heat resistant coatings are required primarily for stacks, exhaust pipes, reactors, space crafts and similar equipments that are permanently or occasionally exposed to elevated temperatures. High-temperature coatings are generally based on silicone resin with ceramic and metallic pigments. In this study, iron oxide, cobalt oxide (thermo chromic compound) and aluminum oxide are used for the preparation of four new types of coloured pigments. The thermal resistant characteristics of these ceramic pigments were studied by differential thermal analysis, thermo gravimetric analysis and differential scanning calorimetric analysis. These ceramic pigments are found to be thermally stable up to 400 °C.     

自蔓延高温合成SrFe12O19的工艺研究

介绍利用自蔓延高温合成技术合成SrFe12O19的工艺过程以及对合成产物的分析。采用X射线衍射(XRD)分析产物的物相；采用透射电子显微镜(TEM)观察其微观结构，晶粒形状及尺寸；采用振动样品磁强计(VSM)测试粉末磁性能，Hc为2559．08奥，4π Ms为3468．3高斯。试验结果表明：采用自蔓延高温合成技术可合成高纯度的SrFe12O19，具有良好稳定的磁性能。     

High-temperature creep of refractory ceramics. Densely sintered single-phase materials

High-temperature creep in densely sintered single-phase ceramics is considered. The effect of impurities in the raw material, controlled admixtures, thermal treatment in firing, and high-temperature service (thermal aging) on the behavior of specimens is investigated. Translated from Ogneupory, No. 8, pp. 5 – 12, August, 1994.     

高温烟气陶瓷过滤材料研究进展

高温烟气过滤技术在工业领域应用广泛,而陶瓷过滤技术是目前高温烟气过滤最有效的手段。本文详细介绍了传统多孔陶瓷过滤材料、陶瓷纤维过滤材料和陶瓷复合微滤膜在高温烟气过滤方面的国内外研究现状及其过滤机制和发展趋势。     

Microcellular foams from some high-performance composites

High-temperature composites were successfully prepared from aminated polysulfone, polyphenylsulfone, and a rod-like polymer polybenzimidazole (PBI). The single glass transition temperature T_g and the absence of evidence for phase separation in scanning electron microscopy suggested that these systems formed so-called ‘molecular composites’. The enhanced miscibility between the polymer pairs was probably due to hydrogen bonding interactions. Compared with the matrix polymers themselves, these composites have improved values of T_g and thermal stability due to a synergistic effect upon incorporation of polybenzimidazole into the polymer matrices. Microcellular foams were successfully prepared from these composites. The foaming behavior and morphologies of the resulting composite foams were much more complicated than those of the pure polymers. In particular, they had unusual bimodal cell size distributions, and some open or partially open-cell structures.     

High-Temperature creep of refractory ceramics. Refractories

High-temperature creep of refractories is considered for their alumina-silicate representatives. Experimental data are presented on the effect of the grain composition of the charge, the molding and firing conditions, and the chemical and mineral contents on the behavior of the specimens. It is shown that the deformation of these composite materials due to mechanical loads is determined by the total effect of the process stages.Translated from Ogneupory, No. 11, pp. 2 – 8, November, 1994.