组成和添加剂对镁铝尖晶石热膨胀性能的影响

研究了镁铝摩尔比为2：1、1：1和1：2的3种不同尖晶石组成，以确定其线性热膨胀性。不同的添加剂，即Cr2O3、TiO2和MgSO4以2％的量加入到所有组成中，并借助于膨胀研究，确定烧结产物的特性。富镁成分始终显示出较高的膨胀性，添加物没有显示出对任何组成有大的影响，与相分析研究结果相似。     

关于简化硅砖真密度测试方法的探讨

通过对硅砖真密度试验方法的探讨，分析找出了一种新的测试方法，并在理论上加以推理，在实践中加以验证。     

焙烧介质和工艺参数对硅质制品性能和相组成的影响

本文研究了焙烧气体介质和其它工艺因素对硅砖性能及其中氧化硅转化程度的影响。根据试样相组成和性能的对比分析结果，推荐以下参数作为使用干矿化剂的硅砖最佳制造工艺参数：硅石颗粒尺寸不大于２ｍｍ；成型压力不低于５００ＭＰａ，烧成温度１４２０℃。根据岩相研究和Ｘ射线照相研究表明，硅砖在还原介质中焙烧是最好的，它能促进硅砖中石英更完全转化并保证硅质制品具有很高的使用性能。     

CaO稳定ZrO2耐火材料的相组成和热膨胀

对CaO稳定ZrO2耐火材料的相组成和热膨胀行为进行了研究.重点讨论了三种具有不同相组成的CaO稳定ZrO2材料的热膨胀特性.研究结果表明,通过调整ZrO2的稳定程度,可以优化材料的相组成和热膨胀行为,从而改善材料的抗热震性能,并有望使耐火材料的综合性能得到提高.     

废硅砖熟料的不同临界粒度对轻质硅砖性能的影响

通过采用1. 65mm、2. 18mm、3~5mm临界粒度的废硅砖熟料制备轻质硅砖,并研究不同的临界粒度对轻质硅砖泥料颗粒组成、砖外观及其性能指标的影响,最终确定出制取效果最好的轻质硅砖所需的废硅砖熟料临界粒度.     

瓷质砖的组成对其性能的影响

1概述瓷质砖气孔率低、机械性能好,抗化学腐蚀和抗霜冻性能好,耐磨性强。根据ISO13006号标准,瓷质砖的吸水率应小于O．5％,意大利市场上瓷质砖产品吸水率都在O．1％左右。但瓷质砖坯体烧成后不可避免的闭口气孔,会影响产品的机械强度。意大利从80年代开始用新的生产技术制造瓷质砖产品,这些技术包括湿法球磨、喷雾干燥、大吨位压机成形、辊道窑快速烧成,从而实现了大规格产品的生产。最初生产的瓷质砖颜色单调,仅用于荷载大的地面,随后出现的抛光砖多次布料技术、渗花技术等新的装饰技术,改善了外观装饰效果,开拓了瓷质砖的使…     

MgO对磷铝酸盐富玻璃相水泥熟料相组成及水化性能的影响

本工作利用XRD,IR,DTA及EMPA技术,研究了含氧化镁磷铝酸盐富玻璃相水泥的合成,相组成及水化活性,并系统讨论了MgO对熟料相组成及水化活性的影响,结果表明,通过掺加适量的MgO,可在1450℃合成结合磷铝酸盐水泥与玻璃水泥的一种新的水泥体系－磷铝酸盐富玻璃相水泥,该水泥熟料以玻璃体为主,少量晶相为CA及CxP。其水化产物相结合构稳定,浆体具有早强,高强且长期强度持续增长的御.     

氧化铝含量对玻璃窑用硅砖性能的影响

鉴于Al_2O_3对硅砖质量的危害仅次于碱金属,本文通过加入Al_2O_3探索其对硅砖各项性能指标的影响.指出Al_2O_3含量的提高对制品的耐火度、荷重软化温度、真密度及制品的矿物组成都是不利的;但对显气孔率、残余线变化及蠕变率影晌不明显.     

选用优质硅砖,确保焦炉低耗长寿

介绍了各时期焦炉硅砖质量指标,重点讨论了硅砖质量对焦炉年伸长量,湿煤耗热量等各项指标的影响,担子同确保焦炉硅砖质量的具体措施和建议。     

Thermal expansion and Young's modulus evolution of fused silica and crystalline silica-containing materials

Fused silica bricks (FSBs) with exceptional thermal shock resistance are frequently used to repair localized damage in coke ovens and are hold promising candidates for the efficient construction of new coke ovens. To maximize their utilization, the effects of thermal history on the thermal expansion and Young's modulus evolution of FSBs were investigated in comparison to crystalline silica bricks (CSBs). Due to the gradual phase transformation of fused silica into cristobalite, the thermal expansion of FSBs are sensitive to the thermal cycle; both silica materials exhibit an increase in thermal expansion after five cycles at 1200°C, whereas the thermal expansion of CSBs is five times greater than that of FSBs. When the testing temperature is less than 1000°C, Young's modulus of CSBs is more sensitive to the thermal history, which is caused by phase transformation-induced microcracks. This sensitivity reduces when the testing temperature is 1200°C, as microcracks healed by liquid phase as well as the softening of residual glass phase. By contrast, when the testing temperature is 1200°C, Young's modulus of fused silica specimens is sensitive to the thermal history owing to the microcracks caused by the gradual phase transformation of fused silica to cristobalite.     

High Quality Silica Bricks for Glass Melting Furnace

This standard specifies the classification, technical requirements, test method, inspection rules, marking, packing, transportation, storage and quality certification of high quality silica bricks for glass melting furnace.     

晶化时间对MgO-Al2O3-SiO2微晶玻璃相转变及热膨胀性能的影响

采用XRD、DTA、SEM等测试方法,对MgO-Al2O3-SiO2（MAS）系微晶玻璃的析晶和微观结构进行了研究,讨论了不同的晶化时间对MAS微晶玻璃析晶行为及其热膨胀性能的影响。结果表明：在1050℃保温,堇青石能快速地晶化析出。随着晶化时间的增长,堇青石相逐渐增多,当晶化2h时几乎完全析出,析出晶粒大小约为2～5um。MAS系微晶玻璃的热膨胀系数与相组成有着密切的关系,随着晶化时间的延长,热膨胀系数逐渐减小。     

High Temperature Thermosets With a Low Coefficient of Thermal Expansion

Summary: Polymeric thermosetting composites can be used as metal substitutes for certain applications if they possess high temperature stability in air, low coefficient of thermal expansion (CTE), and sufficient flexural strength, in combination with competitive costs. Commercial bismaleimide, bisnadimide, and cyanate ester thermosetting materials were selected due to their excellent thermal stability. Low CTEs were achieved by adding high loading levels of fused silica or silicon nitride fillers. Several optimized composites were fabricated by varying the materials, composition, and cure conditions. Characteristic composite properties, such as CTE, thermal stability, glass transition temperature (T_g), flexural strength, and filler distribution were investigated. The best system developed consists of Matrimide 5292, a commercial two‐component bismaleimide resin, filled with 75% Silbond FW100EST, and additionally reinforced with 0.5% Twaron short fibers. This composite is distinguished by a CTE around 15 ppm · K⁻¹, a T_g around 340 °C, flexural strength above 100 MPa, and attractive material costs.

Matrimid 5292 (75%)/Silbond FW100AST (24.5%), and Twaron 2 mm short fibers (0.5%). Three fibers are visible, embedded and well dispersed in the matrix.     

In_2W_3O_(12)陶瓷的相变特性及其负热膨胀性能(英文)

以分析纯In2O3和WO3为原料,采用固相反应法制备In2W3O12陶瓷。利用X射线衍射仪、场发射扫描电子显微镜、热重分析仪、差示扫描量热仪和热机械分析仪对样品的物相组成、微观结构、相变和热膨胀特性进行了表征。结果表明:在900℃烧结6h可制备出纯的单斜相In2W3O12陶瓷,In2W3O12陶瓷断面晶粒均匀,平均尺寸为4～6μm。In2W3O12陶瓷在253.34℃发生单斜相到斜方相的相转变,单斜相的In2W3O12陶瓷显示正热膨胀,在27～249℃,其平均热膨胀系数为16.51×10-6℃-1,斜方相的In2W3O12陶瓷显示负热膨胀,在273～700℃,其平均热膨胀系数为-3.00×10-6℃-1。     

Investigation on Production and Markets of Silica Bricks in China

The annual output of China‘s silica brick amounts up to over 300 thousand tons, which accounts for more than 70% of the total oupout of silica bricks in the world. Besides satisfying domestic markets, China‘s silica bricks have been exported to many countries and retions such as Japan, USA etc. In this paper, the situation of silica bricks production, technology, sales and exporting have been described. Also suggestions on improvement of silica bricks quality and exporting, corporation with foreign partners have been put forward in order to win larger market share both aat home and abroad.     

高密度沉淀池在火力发电厂中的应用

介绍了高密度沉淀池的结构特点、工作原理及其作为火力发电厂原水预处理设施的优点,并将其与传统原水预处理设施进行了综合比较,结果表明:高密度沉淀池对浊度和有机物的去除率高,对水质突变适应能力强,运行成本低。     

BaO-Al2O3-B2O3-SiO2玻璃/SiO2高膨胀低温共烧陶瓷研究

用BaO-Al2O3-B2O3-SiO2玻璃与二氧化硅复合的方法制备了高膨胀系数低温共烧陶瓷。实验首先制备一组玻璃材料,通过热膨胀测试、DTA等方法研究了玻璃的热学性能,然后用玻璃与石英、方石英和鳞石英晶体按一定比例复合制得高膨胀低温共烧陶瓷。通过烧结试验、XRD等分析方法研究了复相陶瓷材料的烧结收缩性能、晶相组成、热膨胀系数和介电常数。结果表明:50%BaO-7.5%Al2O3-30%B2O3-12.5%SiO2玻璃具有较低的转变温度(520℃)。该玻璃与鳞石英晶体以1:1的比例复合,850℃/10min烧结可以获得热膨胀系数为12.18×10-6K-1、介电常数为5.37的低温共烧陶瓷。