预制块是由高分子化合物经过复配加入适量的交联剂、稳定剂和固化剂,在特定条件下 反应预制成的块状泡沫体。预制块的研发目的主要是为了提高煤矿井下密闭和空峒充填的施工速度,提高生产效率。对自承能力差的地层,在槽部嵌入预制块以形成支护形成防护结构。该种泡沫体重量轻、密闭性能好,并可预先制成了块状成品,到达现场即可使用,不再需要购置专用设备,提高了施工效率也节约了成本。
...字: AZ31镁合金;碳纳米管;预制块;复合材料;力学性能[gap=1395]Key words: AZ31 Mg alloy; carbon nanotubes; precast block; composite; mechanical properties...
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...2002)找出了词块的57个同义 词,如程式语(formulaic language)、词束(1exical bun. cue)、预制块(prefabricated chunks)等等。普遍接受的 是Wray对词块的定义:。
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The composites were observed by light microscope. The combination quality of matrix between composite layers is deteriorated when density of preform is increased.
通过光学显微镜对复合材料组织进行研究,发现随着Ti-C体系预制块致密度的提高(50%~65%),复合材料中过渡层质量下降。
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系统地研究了预制块的制备工艺过程及影响因素。
The fabricating process of preform and factors having effect on it were also studied systematically.
利用所制备的预制块,研究了多孔铝合金的加压铸造工艺。
With the fabricated preforms, the pressure casting process of porous aluminum alloy was studied.
预制块,可在各种宽度的支持是任何墙体高度,甚至多的故事。
Pre-cast blocks are available in a variety of widths to support just any height of wall, even multi-story.
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