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    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。
    Because of this, the viscosity、 the glass melting temperature(1610℃) decrease, also La_2O_3 can accelerate the crystallization, but there is no influence on the main crystal phase which is β-quartz, and with adding La_2O_3 the dimension of the crystal and heat expansion coefficient increase, intension performance becomes lower.
    同时,La_2O_3能够促进析晶,但对微晶玻璃的主晶相没有影响,仍为β—石英固熔体,随着La_2O_3的增加,微晶玻璃中的晶粒尺寸逐渐长大,微晶玻璃试样的热膨胀系数变大,抗折强度降低。
    In the glass, the amounts of β-quartz and MgO·Al_2O_3-SiO_2 reached the maximum value during iso-thermal treatment at 950℃, whereas the amount of α-cordierite increased monotonously with time. This suggests that α-cordierite is formed not only by the direct precipitation, but also by the transformation of β-quartz and MgO·Al_2O_3·SiO_2.
    在950℃下热处理的玻璃中,β石英固溶体和MgO·Al-2O_3·SiO_2晶体的析出量均随热处理时间的延长有极大值出现,而α堇青石的析出量则一直随时间的延长而增大。
    The precipitation of β-quartz,MgO·Al_2O_3·SiO_2 and α-cordierite was observed for the sample with polished surface. The surface crystal-lization in this case developed into the glass with the dendrite structure.
    而研磨表面的结晶层则由α堇青石、β石英固溶体、透锂长石型MgO·Al_2O_3·SiO_2晶体三种晶相组成,并呈树枝状向玻璃内部长大,靠近结晶层的玻璃相中也没有球形分相粒子群出现。
    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。
    Then,the strains,stresses and elastic energies for α-β quartz transformation were evaluated according to Hooke's law.
    依据虎克定律以及高压下 β石英的弹性参数 ,估算了α—β石英相转变时的应变、应力和应变能。
    The results indicate that at the pressure of 0~1.1 GPa,the linear strains vary within -0.006~0.005,the volume strains within -0.016~0.012,the stresses within -0.46~0.14 GPa,and the elastic energies within 965~2760 kJ/m 3.At about 0.5 GPa,the strains,stresses and elastic energies achieved their minimum values.
    结果表明 ,在 0~ 1 .1GPa条件下 ,随着压力升高 ,α—β石英相变的线应变介于 - 0 .0 0 6~ 0 .0 0 5之间 ,体应变介于 - 0 .0 1 6~ 0 .0 1 2之间 ,应力介于 - 0 .46~ 0 .1 4GPa之间 ; 应变能介于 96 5~ 2 76 0kJ/m3之间。
    CALCULATION OF THE STRAIN,STRESS AND ELASTIC ENERGY FOR α-β QUARTZ TRANSITION AND ITS GEOLOGICAL SIGNIFICANCE
    α-β石英相变的应变参数计算及其地质意义
 

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