[請益] 單晶發動機葉片為何要這樣長??
這是我在大學時上工程材料時一直有的疑惑。
書名:The Science and Engineering of Materials
作者:Donald R. Askeland Pradeep P. Phule'
頁數:328~329
still better properties are obtained by a single crystal(SC) technique.
Solidification of columnar grains again begins at a cold surface; however
, due to the helical connection, only one columnar grain is able to grow
to the main body of the casting. The single crystal casting has no grain
boundaries, so its crystallographic planes and directions can be directed
in an optimum oriatation.
為什麼長單晶要通過一根螺旋管?是葉片都在鑄模內以金屬液方式存在
然後單晶經由螺旋管慢慢往上長到澆注液內嗎?這樣鑄模內一冷卻,金屬液
其它地方不會核凝嗎?怎麼可能那麼扯就一個晶粒慢慢長大,最後變成葉片。
感謝各位的閱讀 <(_ _)>
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◆ From: 140.116.71.204
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01/30 16:03, , 1F
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那用螺線管的原因呢?直管不行嗎?
因為課本說是要讓單一柱狀晶通過。
※ 編輯: gudon 來自: 140.116.71.204 (01/30 16:08)
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原來如此,好像又明白一些了,多謝h大解說。
※ 編輯: gudon 來自: 140.116.71.204 (01/30 18:31)
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