粉体および粉末冶金
Online ISSN : 1880-9014
Print ISSN : 0532-8799
ISSN-L : 0532-8799
Densification Behavior of PIMed TiAl Parts
Yongchan KimNack J. KimTaesik YoonS. Ahn
著者情報
ジャーナル オープンアクセス

1999 年 46 巻 8 号 p. 882-886

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抄録
Powder Injection Molding (PIM) of Ti-48Al was attempted with a special interest in its densification behavior at different processing conditions such as debinding atmosphere, sintering temperature and time. Specimens debinded in H2 showed high densification rate, resulting in 97% density after sintering at 1350°C in vacuum for 3 hours. Fine Al2O3 particles about 1 μm size were observed along the prior particle boundaries of the sintered specimens. Specimens debinded in Ar and sintered in vacuum at 1350°C and 1400°C for 3 hours resulted in similar densifications of 91.7% and 91.5%, respectively. The microstructures were, however, quite different; Sintering above α/(α+γ) transus temperature showed a fully lamellar microstructure with a coarse grain size, whereas sintering at 1350°C showed a fine grained duplex microstructure. Presintering at 1000°C for 3 hours eliminated the macro pores and improved densification to 93.4% when the specimen was subsequently sintered at 1350°C for 3 hours. Densification was improved as the sintering time increased, reaching a near full density of 98.8% after 30 hours sintering at 1350°C.
著者関連情報
© Japan Society of Powder and Powder Metallurgy

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