金屬射出成形零件在脫脂及燒結時之變形研究
Date Issued
2001
Date
2001
Author(s)
黃坤祥
DOI
892216E002045
Abstract
粉末射出成形製程產品的尺寸穩定性較傳統粉末冶金來得差，主要的原因為此製程的步驟較多，而有較大的累積工差所導致。本實驗的主要目的即是在調整黏結劑配方與選擇粉末以改善MIM 工件的抗變形能力及尺寸穩定性方面的問題。在探討黏結劑配方方面，結果顯示以聚乙烯(LDPE)作為骨架黏結劑時，其工件較使用二元骨架黏結劑(PP/LDPE 、POM/LDPE 及HDPE/LDPE)有較佳的尺寸穩定性。而在比較不同特性的粉末對MIM 工件變形行為的影響方面，以球形粉作為基礎粉末時，其尺寸穩定性及抗變形能力均較不規則粉末差，但本實驗顯示此仍可藉由提高粉體固含量而得到改善。
The MIM process has inferior
dimensional control compared to the
traditional powder metallurgy process due to
the large amount of shrinkage and the
complicated processes. The objective of this
study was thus to improve the distortion and
the dimensional stability of MIM compacts
through binder design and powder selections.
The results show that when LDPE is
used as the backbone binder, better
dimensional stability is attained than that
using binary backbone binders, such as
PP/LDPE, POM/LDPE, and HDPE/LDPE.
The study also shows that the poor
dimensional control of MIM compacts which
are made from spherical powders can be
improved by increasing the solid content.
Subjects
powder injection molding
dimensional control
binder design
defcts
Publisher
臺北市：國立臺灣大學材料科學與工程學研究所
Type
report
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