排序方式: 共有5条查询结果,搜索用时 109 毫秒
1
1.
邓飞%黄剑锋%曹丽云%吴建鹏%贺海燕 《宇航材料工艺》2006,36(6):1-4,8
针对硅酸钇材料结构特点和物理化学特性,综述了该材料目前在高温抗氧化涂层、光学以及微电子器件等领域的应用现状,并介绍了近年来国内外相关制备技术的发展情况,对硅酸钇材料今后的研究趋势和发展方向进行了展望。 相似文献
2.
One of the big surprises of the Infrared Space Observatory (ISO) has been discovery of crystalline silicates outside our own
Solar system. It was generally assumed before that all cosmic silicates in space were of amorphous structure. Thanks to ISO
we know now that crystalline silicates are ubiquitous in the Galaxy (except for the diffuse ISM) and sometimes even in very
large quantities (> 50% of the small dust particles). The evolution of the crystalline silicates is still not completely clarified,
but the combination of theoretical modeling and observations have already shed light on their life-cycle. The absence of crystalline
silicates in the diffuse ISM provides us with information about the dust amorphization rate in the ISM. 相似文献
3.
Silicates in comets appear to be a mix of high-temperature crystalline enstatite and forsterite plus glassy or amorphous grains
that formed at lower temperatures. The mineral identifications from the 10 and 20 μm cometary spectra are consistent with
the composition of anhydrous chondritic aggregate IDPs. The origin of the cometary silicates remains puzzling. While the evidence
from the IDPs points to a pre-solar origin of both crystalline and glassy components, the signatures of crystalline silicates
appear in the spectra of young stellar objects only at a late evolutionary stage, when comets are the likely source of the
dust.
This revised version was published online in June 2006 with corrections to the Cover Date. 相似文献
4.
硅酸盐无机胶粘剂的研究 总被引:6,自引:0,他引:6
论述了一种硅酸盐胶粘剂,它具有强度高、耐水性和抗热震性好及固化温度低的特点。实验发现,金属Al粉的加入,可以有效地改善胶粘剂的强度和抗热震性,但使得用温度有所下降。而防水剂则可以有效抑制体系中碱金属离子的游离。 相似文献
5.
1