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研究生:李宏仁
研究生(外文):Lee, Hong-Jen
論文名稱:粒徑對金屬射出成形製程中溶劑脫脂行為之影響
論文名稱(外文):The effect of particle size on the solvent debinding in the metal injection molding process
指導教授:黃坤祥黃坤祥引用關係---
指導教授(外文):Kuen-Shyang Hwang
學位類別:碩士
校院名稱:國立臺灣大學
系所名稱:材料科學與工程學研究所
學門:工程學門
學類:材料工程學類
論文種類:學術論文
論文出版年:1998
畢業學年度:86
語文別:中文
論文頁數:99
中文關鍵詞:溶劑脫脂金屬射出成形粉末特性界面活性劑粉末粒徑
外文關鍵詞:solvent debindingmetal injection moldingpowder characteristicssurfactantpowder size
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本論文之研究目的在探討粒徑對金屬射出成形製程中溶劑脫脂行為的影響.實驗中以316
L不銹鋼與1641羰基鐵粉為基礎粉,經由Alpine公司提供的Zigzag Classifier粒徑分級機
將其分離成不同平均粒徑的粉末,加入低密度聚乙烯,石蠟和硬脂酸組成三元黏結劑系統做
射出成形.射出生胚在50度C正庚烷中進行溶劑脫脂,藉由掃瞄式電子顯微鏡及水銀測孔儀
觀察其在脫脂各個階段的微結構,黏結劑脫除與孔徑變化情形.此外,輔以雷射膨脹測距儀
量測不同粒徑的試片在溶脫過程的膨脹量,再用紅外線光譜儀來判斷粉體與黏結劑之間的
鍵結情形,加上脫脂過程的重量損失與時間的關係,期望能對粒徑在金屬射出成形製程中溶
劑脫脂時所扮演的角色有更深入的瞭解.實驗結果顯示:1.溶劑脫脂機構對316L不銹鋼射出
生胚而言是:溶解反應先沿著粉體表面進入胚體內部,然後再由粉體與黏結劑之界面向周圍
擴散,因為粉體愈大比表面積愈小,故脫脂速率隨粒徑大而變小;對1641羰基鐵粉而言,溶劑
脫脂機構是從胚體表面之粉體間的黏結劑內部開始進行,而非像316L不銹鋼系統沿著粉體
表面反應,所以粒徑愈大則溶劑脫脂速率愈快.2.對316L不銹鋼而言,溶劑脫脂時試片之尺
寸膨脹量隨粒徑減小而變大.3.因為界面活化劑SA與316L不銹鋼粉體間鍵結不明顯,但是與
1641羰基鐵粉間有較強的鍵結,所以316L不銹鋼射出生胚不論以LDPE或PP為骨架黏結劑都
有黏結劑剝離現象,而1641羰基鐵,M2高速鋼和添加偶合劑的316L不銹鋼射出生胚則沒有明
顯之剝離現象.4.對316L不銹鋼射出生胚而言,溶脫速率,尺寸膨脹量和空孔累積體積都隨
粒徑減小而變大;對1641羰基鐵射出生胚而言,溶脫速率和空孔累積體積都隨粒徑增大而變
大.關鍵詞:溶劑脫脂,金屬射出成形,粉末特性,界面活性,劑粉末粒徑.
This study investigated the influence of particle size on the solvent debindin
g in the metal injection molding (MIM) process. Using the powderclassifier, 31
6L stainless steel and 1641 carbonyl iron powders wereclassified into several
groups with different particles. The powderswere then kneaded with a three-com
position binder. After injection molding,the parts were debound in n-heptane a
t 50 degree C. Using scanning electronmicroscopy, laser dilatometer and the me
rcury porosimeter, the microstructureevolution, pore size distribution and the
in-situ dimensional changes duringthe sovent debinding were obtained. Transmi
ssion infrared spectroscopy was also employed to understand the interaction be
tween the stearic acid and themetal powder. The results showed that :1.For 316
L stainless steel, the bonding between the binder and the powder was very we
ak and became the first region that the solvent attacked. It was found that
the larger powder had a slower debinding rate which is different from that r
eported in the literature. This was caused by its unique debinding mechanism.
For 1641 carbonyl iron, the binder dissolution began at the binder itself an
d the debinding rate for the 1641 carbonyl iron increased as the iron partic
le size increased.2.For 316L stainless steel, the in-situ length change during
solvent debinding of molded parts decreased with the increasing of powder pa
rticle size.3.As a surfactant, stearic acid was well adsorbed onto the 1641 ca
rbonyl iron powder but not onto the 316L stainless steel powder surface. With
a new surfactant of Lica 12, the bonding was improved. Keywords: solvent de
binding, metal injection molding, powder characteristics, surfactant,
powder size.
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