排序方式: 共有65条查询结果,搜索用时 259 毫秒
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硼铝硅玻璃中钙镁氧化物摩尔比对玻璃性能的影响 总被引:1,自引:0,他引:1
用精密阻抗仪、梯度析晶炉、粉末玻璃水浸泡等方法研究了硼铝硅玻璃系统中CaO和MgO含量的变化对玻璃介电常数、介电损耗因子、失透温度范围和玻璃耐水侵蚀性能的影响.并用X射线衍射仪分析测试失透温度范围后的玻璃样品.用红外光谱对各玻璃样品进行了结构分析.结果表明:CaO和MgO总质量分数不变,MgO含量高时玻璃具有相对低的介电常数和介电损耗.CaO的存在使玻璃更不易失透.当CaO和MgO的摩尔比为2:1时,玻璃具有较好的耐水侵蚀性.造成玻璃失透的机理主要是玻璃分相,失透玻璃中没有发现晶体存在.CaO和MgO摩尔比的变化对B2O3原子团的配位状态有一定的影响,从而影响了玻璃的介电性能. 相似文献
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影响粉煤灰水泥性能的因素研究 总被引:1,自引:0,他引:1
本文通过正交分布试验,讨论了熟料细度、粉煤灰细度以及粉煤灰掺加量对粉煤灰水泥性能(强度)的影响。得出影响粉煤灰水泥性能(强度)的最主要的因素为熟料细度,其次为粉煤灰掺量。为增加粉煤灰掺加量或提高粉煤灰水泥强度提供了理论依据。 相似文献
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比较了几种不同粉磨工艺在相同的能耗下粉磨粉煤灰水泥的性能。认为应将能耗大部分消耗在熟料的粉磨上。提出以二段粉磨为粉煤灰水泥的最佳粉磨方式。 相似文献
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采用放电等离子装置烧结制备TiC/TiAl复合材料,在一定烧结压力以及保温时间条件下,研究了烧结温度对TiC/TiAl复合材料致密度的影响,并对烧结过程进行了分析。实验结果表明在1100℃,30MPa的压力下,保温10min就可得到致密超过98%的TiC/TiAl复合材料。而采用传统热压法烧结TiC/TiAl复合材料烧结温度则需要达到1250℃,保温时间为2小时。通过比较可以充分体现出放电等离子烧结技术的优越性。另外,SEM观察表明采用等离子放电烧结的TiC/TiAl复合材料断面组织均匀致密,无显著气孔。 相似文献
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By introducing other oxide materials(SiO_2, Al_2O_3, CaO) into the red mud, all materials were melted into aluminosilicate glasses. On the basis of 17.2Fe_2O_3-5.7CaO-18.2Al_2O_3-50SiO_2-5.9Na_2O-3TiO_2 system glasses, [Al_2O_3]/[CaO] mass ratio changed further. For each sample, the assignment of IR absorption bands for aluminosilicate glasses was investigated by Fourier transform infrared spectroscopy and the glasstransition temperature and high temperature molten state were studied by differential scanning calorimetry. According to X-Ray diffraction and differential scanning calorimetry, the behavior of crystallization was analyzed. The results show that the glass structures of three-dimensional network are depolymerized and the amount of non-bridging oxygens increases gradually with network modifier CaO replacing network intermediate Al_2O_3 when [Al_2O_3]/[CaO] ratio of aluminosilicate glass decreases from 4.05 to 0.66, resulting in decreasing density, melting temperature, crystallization peak temperature and glass-transition temperature. As [Al_2O_3]/[CaO] mass ratio decreases, the concentration of crystallized phase maghemite(γ-Fe_2O_3) will increase which provides the possibility for production of black glass-ceramic further. 相似文献
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