高抗热震性氧化铝空心球砖的研制

以氧化铝空心球为骨料，基质中加入适量的SiO2及硅线石，生产出了热震稳定性好、重烧线变化率小的氧化铝空心球砖。     

High Alumina Refractory Mortars

1 ScopeThis standard specifies the classification,technical requirements,test methods,quality appraisal procedure,packing,marking,transportation,storage and     

氧化铝微粉加入量对特种硅莫砖性能的影响

以高铝矾土熟料、电熔白刚玉、碳化硅、广西白泥、氧化铝微粉为主要原料,亚硫酸纸浆废液为结合剂,制备出水泥窑过渡带用特种硅莫砖,研究了氧化铝微粉加入量对硅莫砖的常温物理性能、抗热震性和耐磨性的影响,并对试样进行XRD和SEM分析.结果表明:随着氧化铝微粉加入量的增加,硅莫砖的耐压强度、体积密度先升高后降低,显气孔率则先降低后升高;抗热震性随微粉加入量的增加先变好后边差的趋势;其中,微粉加入量为4％的硅莫砖综合性能最好,是大型水泥回转窑过渡带的理想内衬材料.     

压制成型高致密氧化铝陶瓷的研究

研究提高中/远红外透明陶瓷的成型密度的方法。以0.3μm的商业α-Al2O3(99%纯)为原料,经特殊的压制成型、常压无助剂烧结于1600℃x3h获得了密度为98.2%的致密氧化铝陶瓷。本文采用的压制成型方法对于制备中/远红外透明陶瓷具有指导意义和实用价值。     

用SiC加强的高铝浇注料

为了提高高铝浇注料的烧结、物理和耐火性能,添加了不同数量的SiC(最高达8％),测量了半成品试样的耐压强度,采用差热分析(DTA)研究了水合性能。在1550℃下烧结3h,采用X射线衍射对烧结试样的成份做了研究。根据标准规格,对烧结参数(体积密度和显气孔率)和物理性能(耐压强度)及耐火性能(抗热震、重烧线变化、荷重)做了试验。因此推断增加SiC的含量可改善烧结、物理和耐火性能,但是相反地对半成品的强度有所影响。然而,含有6％SiC的浇注料在可接受的半成品强度和已改善的烧结、物理和耐火性能之间显示出比较好的平衡。烧结试样已改善的性能与基质中SiC-莫来石系统的形成有关。     

高铝瓷质抛光砖的研制

本文打破瓷质抛光砖坯体中常规氧化铝含量17%～22%的界限,将坯体中的氧化铝含量提高到28%左右。试验证明产品经抛光后不仅白度超过70°,而且强度也有了较大的提高。     

优质镁橄榄石砖的研制

以橄榄岩为主要原料生产镁橄榄石制品的工艺核心问题是经过高温化学反应完成由铁橄榄石转变为镁橄榄石的相变过程,2(Mg·Fe)O·SiO2 MgO→|[O]2MgO·SiO2 MgO·Fe2O3,以实现方镁石固溶体与镁橄榄石的结合,呈现合理的显微结构,使制品具有良好的综合性能。     

高性能电熔莫来石砖的研制

采用高纯电熔莫来石、兰晶石、石英粘土、改性添加剂经粉碎、磁选后混和,再加入粘结剂进行混碾,最后经成型、干燥、烧成而成.结果表明该莫来石砖具有成本低、体积密度高、耐酸度高,尤其是常温抗折强度高达19.1MPa、抗压强度88MPa、重烧线收缩经1 600℃×5h为0、热震稳定性能优异的优点.该方法具备工艺简单、成本低廉、可操作性强等优点.     

高性能面砖的生产工艺

介绍了一种高性能面砖(釉面砖)的生产工艺.通过调整配料及其化学组成,在一定温度下,采用低温素烧高温釉烧,可烧制高性能面砖,特别对降低砖的水化膨胀率.改善抗冻性和耐碱性能收到明显的效果.     

谈高掺量高强度粉煤灰蒸压砖生产前景

目前 ,粉煤灰、煤矸石烧结砖存在的缺点是生产中的尾气含有大量二氧化硫和三氧化硫等有害物质 ,对大气污染严重 ,加上脱硫成本较高 ,处于微利的砖厂很难上马 ,即使是部分较现代化的砖厂能够上得起脱硫装置的也运行不起 !一套大断面隧道窑的脱硫塔运行成本非常高。本文对粉煤灰蒸压砖的生产前景进行简要分析 ,以期和各地区的朋友共同探讨。1　高掺量粉煤灰砖发展现状粉煤灰烧结砖　粉煤灰烧结砖经过近半个世纪的摸索 ,工艺逐渐成熟 ,核心设备还是欧洲的先进设备比较可靠。目前粉煤灰烧结砖还存在着三个不好解决的难题 :一是二次污染 ;二是粉…     

Dielectric Properties of Alumina at High Temperatures

The dielectric constant and dissipation factor of both single-crystal and polycrystalline alumina were measured in air over the frequency range lo² to 3 × 10⁵ cycles per second, in the temperature interval 900° to 1300° C. The three-electrode guard-ring method was used. The observed dielectric losses were due predominately to free-electron conduction mechanisms. The volume conductivity of single-crystal and polycrystalline alumina was calculated from the high-frequency data. The temperature dependences of the volume conductivity for two single crystals of different thicknesses were similar. The large thermal activation energy indicated intrinsic conductivity; the energy band gap of alumina was calculated to be approximately 7.3 electron volts. The bulk conductivities of the polycrystalline alumina were considerably higher than the single-crystal values, presumably because of impurities in the polycrystalline material. The results were compared with values previously reported in the literature.     

Shaped Insulating Refractory Product—High Alumina Bricks

GB/T 3995-2006 1 ScopeThis standard specifies the classification,shape and dimension,technical requirements,test methods,quality appraisal procedure,packing,marking,transportation,storage,and quality certificate of high alumina insulating bricks.High alumina insulating bricks are used as working layer which contacts with fire directly,insulating layer,or inner lining of the kilns which does not react with the high temperature molten materials and corrosion gases.     

一种高铝喷涂料的开发

以铝矾土（3．35mm～0．425mm和≤150μm）为主要原料,铝酸钙水泥为结合剂,制备出了一种氧化铝含量在70％以上的喷涂料。将试样经110％干燥后,每隔100％设置一次烧结试验。测定试样经过不同热处理温度后的体积密度、线性变化率、抗折强度和耐压强度。结果表明,研制出的高铝喷涂料在高温下具有较优良的性能。     

Modified Alumina Cement with High Service Properties

This scientific paper gives consideration to the information on the contemporary structure of binary systems and three-component CaO-Al_2O_3-ZrO_2 system required to select rational parameters for the synthesis of cementing agents.The production process of experimental clinker that has a Ca_7Al_6ZrO_(18) composition has been described.The data of X-ray phase analysis and petrographic analysis of the experimental composition of special cement have been given and the reasons for availability of inappropriate phases have been analyzed.The processes of hydration hardening of the cement stone have been studied and the data of differential thermal analysis were used for the establishment of the hydration mechanism for basic crystal phases in the cement clinker composition.The differences in the hydration processes of experimental special cement were analyzed in comparison with known mechanisms.A possibility of the exploitation of special binder in contact with ZrO_2(CaO-stabilized)was tested using the specimens of fine concrete that were subjected to thermal treatment in different modes.The physical and mechanical properties of specimens and the mineralogical composition of concretes were given based on the data of X-ray analysis and the petrographic analysis.The cement additive was selected and its amount in the concrete composition was defined to slow-down the hardening and the mixture plasticization time.The relationships of physical and mechanical characteristics of concrete specimens were defined experimentally as a function of granulometric composition of the filler and thermal treatment temperature.The investigation data of corrosion resistance obtained using the static method were used to find out if experimental concretes can operate in contact with the steel-smelting alkaline slag.     

高掺量粉煤灰烧结砖工艺及技术装备

现将本公司研制开发的高掺量粉煤灰烧结多孔砖的工艺及技术装备作一介绍。1 粉煤灰的原料特性 粉煤灰呈细粉状的(1～50微米)球形玻璃体,通常含量70％以上,具有多孔结构,孔隙率为60％～75％,对水的吸附能力很大,往往含水率达30％,仍呈松散状态。大掺量利用粉煤灰,关键是解决尽可能高掺量的粉煤灰与胶结料混合后,如何制备满足烧结砖要求的混合料。     

Tensile Ductility in Zirconia-Dispersed Alumina at High Temperatures

High-temperature plastic flow in Al₂O₃-10 wt% ZrO₂ (2.5 mol% Y₂O₃) has been examined at temperatures between 1400° and 1500°C. Al₂O₃-10 wt% ZrO₂ (2.5 mol% Y₂O₃) exhibits much higher flow stress and smaller tensile elongation below about 1450°C than 0.1 wt% MgO-doped single-phase Al₂O₃. The suppression of grain growth with ZrO₂ dispersion into Al₂O₃ is not effective for improving the tensile ductility. The limited ductility in Al₂O₃-10 wt% ZrO₂ (2.5 mol% Y₂O₃) is associated with the increment of flow stress caused by ZrO₂. The ZrO₂ dispersion or segregation in Al₂O₃/Al₂O₃ boundaries suppresses the grain boundary sliding and hence results in the increased flow stress at high temperatures.     

硅砖在高温玻璃熔窑上的合理使用

探讨了在高温玻璃熔窑窑顶和窑墙上及在蓄热室中有效使用硅砖的条件。     

Tensile Stress Relaxation of Alumina at High Temperature

The development of a tensile testing methodology for ceramics which enables a stress vs strain-rate response to be measured at high temperature is described. The test involves a carefully controled stress relaxation test at constant total strain using an experimental procedure and phenomenological analysis previously developed for metallic materials. It is demonstrated here with preliminary tests on alumina at 1050° and 1150°C. This offers, with further development, the possibility of establishing design stresses associated with low strain-rate behavior for structural applications. The results demonstrate that data covering four decades of strain rate may be generated in tests lasting a few hours. The inelastic strain consists of substantial anelastic recoverable strain in addition to a permanent creep strain.