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β-quartz
    A STUDY ON α-QUARTZ β-QUARTZ PHASE TRANSITION OF TWO KINDS OF CHERTS
    两种不同燧石中α-石英 β-石英相变的研究
    the micro-structure analysis resultsindicate that a part of α-quartz and vitreous phase X-ray amorphous silicon transfer to β-quartz,partial γ-Al2O3 transfers to α-Al2O3,kaoline and cristobalite transfer to β-quartz, α-Al2O3 andinert mullite.
    微观分析结果表明:粉煤灰中的部分α-石英和玻璃相x-射线无定形的硅转化为β-石英型,部分γ-Al2O3转化为α-Al2O3型,高岭土和方英石可转化为β-石英型硅、α-Al2O3型铝和惰性莫来石。
    The phase equilibrium boundaries were calculated by the thermodynamic method for the following reactions:Berly=Phenakite+Chrysobery1+5β-Quartz 2Chrysobery1+3α-Quartz =2Kyanite +Phenakite 2 Chrysoberyl+ 3 Coesite =2 Kyanite+ Phenakite.
    通过热力学方法计算了下列平衡反应:绿柱石=硅铍石+金绿宝石+5β-石英; 2金绿宝石+3α-石英=2蓝晶石+硅铍石;
    The results showed that the densification occured between 700~900℃, before the formation of crystalline cordierite, α-cordierite was formed through μ-cordierite, β-quartz solid solution and spinel at 1 150℃.
    研究结果表明:坯体的致密化过程先于MAS晶体的形成,该过程发生在700~900℃之间,α-MAS是通过μ-MAS、β-石英固溶体及尖晶石于1150℃反应而形成的。
    It is found that, the law is induced mainly from regularly change of the content of p-quartz( low coefficient of thermal expansion, high density) resulting from transformation of condensate depression and crystal phase(β-quartz→β-spodumene).
    分析发现,这主要是由于过冷度的变化和晶型转变(β-石英固溶体→β-锂辉石)引起的β-石英固溶体(低膨胀系数、高密度)含量的规律性增减所造成的。
    The results also show that the lower temperature of heat treatment takes advantage to form β-quartz solid solution and β-quartz solid solution is transformed into p-spodumene solid solution with the increasing of the heat treatment temperature, which lead to decrease in the property of transparency and increase in the thermal expansion coefficient.
    较低的热处理温度与较长的热处理时间有利于形成β-石英固溶体,温度升至810℃左右时β-石英固溶体向β-锂辉石固溶体转变,微晶玻璃的透明性降低。
    The results clearly indicate that the employed variables-Fe2O3 concentrations (0-10 wt%) and crystallization time (0-100 hours) are directly responsible for the variation in the valence, coordination states, and the symmetry of the electrical environment of iron in the dominant crystallized β-quartz solid solution.
    结果指出,铁离子浓度(0~10重量%)和晶化时间(0~100小时)对铁在主晶相β-石英固溶体中的价态、配位状态和最邻近电子环境的不对称程度有直接的影响。
    The results show that with the increasing temperature magnesium aluminotitanate(MAT), β -quartz solid solution( β -QSS), sapphirine, spinel, α -cordierite, α -quartz, cristobalite, enstatite are precipitated in glass in sequence.
    结果表明 :随温度升高 ,玻璃中依次析出镁铝钛酸盐、β-石英固溶体、假蓝宝石、尖晶石、α -堇青石、α -石英、方石英、顽辉石等晶体。
    Results show that only β - quartz solid-solution crystallization phase is obtained when heating the dried gels from 800 ℃ to 1 000 ℃, a stable tetragonal β- spodumene solid-solution begins to appear at 1 100 ℃ and all the β- spodumene solid-solution are obtained at 1 200 ℃.
    热处理温度在1 100℃时。 β-石英固溶体开始转变成稳定的四方晶系β-锂辉石固溶体,到1 209℃时已经完全转变为β-锂辉石固溶体。
    With the replacement of 5% , β- quartz solid solution precipitated first, then β- spodumene with increasing temperatures.
    当ZnO的取代量为5%时,首先析出的晶相仍为β-石英固溶体;
    When the replacement was increased to 10% with crystallization at 820℃ , willemite appeared in addition to β- quartz solid solution and β- spodumene. Then the samples had higher flexural strength and fracture toughness.
    当ZnO的取代量增加到10%时,820℃高温晶化后,除了析出了β-石英固溶体、β-锂辉石固溶体外,还出现了硅锌矿相,使材料有较好的热性能和力学性能。
    Furthermore, there are many volcanic products such as β-quartz and siliceous cylinder and siliceous spherules in bed 24e_2, and the contents of trace elements in pyrites and limestone are anomalously high in bed 24e_2 and bed 24f.
    而且,在第24e2分层黄铁矿高含量层位中,还共生有较多β-石英等火山碎屑物质; 岩石和黄铁矿中微量元素含量异常富集。
    Only one crystal phase namely cubic gahnite ZnAl2O4 exists when heat-treated below 970 ℃,and tetrahedral β-quartz phase begins to precipitate at 970 ℃ and becomes the main crystal phase at 1 100 ℃,at the same time,gahnite ZnAl2O4 becomes the minor crystal phase.
    热处理温度在970℃以下的玻璃陶瓷只有一种立方结构的锌尖晶石ZnAl2O4晶相存在。 热处理温度为970℃时,开始析出四面体β-石英晶相;
    The results show that the heat treatment process can control the precipitate of the crystals. β-quartz solid solution precipitated first at the initial crystallization temperature, then β-spodumene with increasing temperatures.
    结果表明:通过热处理工艺来控制晶相的析出,析晶初始温度下首先析出的晶相为β-石英固溶体,随晶化温度升高β-石英固溶体转变为β-锂辉石固溶体,可以使样品的热膨胀性能符合要求。
 

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