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Effect of calcination temperature on lattice defects in impure magnesium oxide 煅烧温度对不纯氧化镁晶格缺陷的影响
Ceramurgia International
Pub Date : 1979-01-01 DOI: 10.1016/0390-5519(79)90011-5
S.A. Abdel-Hady, N.A. Ahmed, A.R. El-Dib, M.S. Farag

The crystallite size and the strain of powdered MgO prepared by decomposing magnesium carbonate in the range 600–1300°C were measured in [100] and [111] crystallographic directions by analyzing the X-ray line broadening. The Warren and Averbach multiple order method was used. The results showed that the crystallite size and the strain are anisotropic. The lattice parameter was calculated from the centre of gravity of the kα1 line profile of all planes using Wagner's extrapolation method. The changes in the density of the powdered samples and the changes in the unit cell constant showed that the Schottky defects are probably present at low firing temperatures and there are adsorbed contaminant agents on the primary surfaces of the crystallites. The impurities affected the properties of the polycrystalline material. Their effects were very evident in the magnetic susceptibility values, in the sudden increase of the crystallite size above 1000°C and in the high value of the strain at that temperature.

通过x射线谱线展宽分析，在600 ~ 1300℃范围内分解碳酸镁制备的粉末MgO在[100]和[111]晶体学方向上的晶粒尺寸和应变进行了测量。采用Warren和Averbach多阶方法。结果表明，晶体尺寸和应变具有各向异性。采用Wagner外推法从各平面kα1线轮廓的重心计算晶格参数。粉末样品密度的变化和晶胞常数的变化表明，肖特基缺陷可能在低烧成温度下存在，并且在微晶的初级表面吸附有污染物。杂质影响了多晶材料的性能。它们的影响在磁化率值、晶粒尺寸在1000℃以上的突然增大以及该温度下的高应变值中表现得非常明显。
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引用次数: 0
Kinetics and mechanism of the solid-state high-temperature transformation of andalusite (Al2SiO5) into 32-mullite (3Al2O3.2SiO2) and silica (SiO2) 红柱石(Al2SiO5)固相高温转化成32-莫来石(3al2o3.2 . SiO2)和二氧化硅(SiO2)的动力学及机理
Ceramurgia International
Pub Date : 1979-01-01 DOI: 10.1016/0390-5519(79)90008-5
H. Schneider, A. Majdič
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引用次数: 23
Kinetics and mechanism of the solid-state high-temperature transformation of andalusite (Al2SiO5) into 32-mullite (3Al2O3.2SiO2) and silica (SiO2) 红柱石(Al2SiO5)固相高温转化成32-莫来石(3al2o3.2 . SiO2)和二氧化硅(SiO2)的动力学及机理
Ceramurgia International
Pub Date : 1979-01-01 DOI: 10.1016/0390-5519(79)90008-5
H Schneider, A Majdič

The kinetics of the high-temperature transformation of andalusite (<40 μm) were investigated by means of X-ray techniques. The transformation interval was determined to lie between about 1250 and 1500°C. The best fitting of the kinetic data was achieved with an exponential law of the type: 1 − α = exp (−kt + ct/(t + 1)). The kinetic curves are associated with a topotactic transformation mode with preservation of the aluminium-oxygen octahedral chains and diffusion of aluminium, silicon and oxygen atoms. Below 1380°C, mullite (+SiO2) formation is essentially restricted to an initial rapid period of the transformation, because nucleation and product growth occur only at energetically favored lattice sites (e.g. grain boundaries). Above 1380°C, mullite and SiO2 nucleation and growth may take place throughout the volume of the low-temperature phase (andalusite) over the whole range investigated.

利用x射线技术研究了红柱石(<40 μm)的高温转变动力学。相变区间在1250 ~ 1500℃之间。结果表明:1 - α = exp (- kt + ct/(t + 1))是最佳拟合方程。动力学曲线与铝氧八面体链保存和铝、硅、氧原子扩散的拓扑转换模式有关。在1380℃以下，莫来石(+SiO2)的形成基本上局限于转变的初始快速阶段，因为成核和产物生长只发生在能量有利的晶格位置(如晶界)。在1380°C以上，莫来石和SiO2在整个低温相(红柱石)的整个体积内都可能成核和生长。
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引用次数: 23
Surface tension and density of molten glasses in the system La2O3Na2Si2O5 La2O3体系中玻璃液的表面张力和密度Na2Si2O5
Ceramurgia International
Pub Date : 1979-01-01 DOI: 10.1016/0390-5519(79)90005-X
A. Passerone, R. Sangiorgi, G. Valbusa

Surface tension, density, and volatility of sodium disilicate, modified by additions of 1%, 5%, 10%, mole La2O3, have been evaluated at temperatures varying from 900 to 1500°C, under highly reducing conditions. These results and related data (such as activation energy of evaporation reaction; thermal expansivity; temperature coefficient of surface tension; nonideal behaviour; surface adsorption) have made possible interpretation of the role played by lanthanum in modifying the properties of the base glass.

通过添加1%、5%、10%摩尔La2O3修饰的二硅酸钠的表面张力、密度和挥发性，在900至1500℃的温度范围内，在高度还原的条件下进行了评估。这些结果和相关数据(如蒸发反应活化能;热膨胀系数;表面张力温度系数;非理想的行为;表面吸附)使得镧对基玻璃性能的改变有了可能的解释。
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引用次数: 12
Nuclear division 核分裂
Ceramurgia International
Pub Date : 1978-10-01 DOI: 10.1016/0390-5519(78)90039-X
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引用次数: 0
Materials and equipment division 物料及设备科
Ceramurgia International
Pub Date : 1978-10-01 DOI: 10.1016/0390-5519(78)90040-6
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引用次数: 0
Figures-of-merit for the thermal stress resistance of high-temperature brittle materials: a review 高温脆性材料抗热应力性能指标综述
Ceramurgia International
Pub Date : 1978-10-01 DOI: 10.1016/0390-5519(78)90028-5
D.P.H. Hasselman

A review is presented of the selection rules for brittle structural ceramics subjected to severe thermal stress. A total of twenty-two figures-of-merit are presented for a total of twenty-nine different heat transfer environments and/or criteria of thermal stress resistance, involving steady-state or transient heat transfer, internal heat generation, thermal buckling as well as thermal fatigue and unstable crack propagation.

综述了脆性结构陶瓷在高温应力作用下的选择规律。对于总共29种不同的传热环境和/或热应力抵抗标准，总共提出了22个优点值，包括稳态或瞬态传热，内部热产生，热屈曲以及热疲劳和不稳定裂纹扩展。
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引用次数: 95
Ceramic-fibre cladding of refractory-brick furnace linings 耐火砖炉衬的陶瓷纤维包覆层
Ceramurgia International
Pub Date : 1978-10-01 DOI: 10.1016/0390-5519(78)90056-X
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引用次数: 0
Liquid fuels from coal pilot plant 中试煤厂生产的液体燃料
Ceramurgia International
Pub Date : 1978-10-01 DOI: 10.1016/0390-5519(78)90053-4
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引用次数: 0
Intergrind '79 Intergrind 79
Ceramurgia International
Pub Date : 1978-10-01 DOI: 10.1016/0390-5519(78)90035-2
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引用次数: 0
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