Effect of Ni and Ni3Al Additions on Sintering of Molybdenum Powders
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- Sakamoto Takashi
- Department of Mechanical and Electrical Engineering, Yatsushiro National College of Technology
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- Honda Tadatoshi
- Department of Mechanical Engineering & Materials Science, Faculty of Engineering, Kumamoto University
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- Miura Hideshi
- Department of Mechanical Engineering & Materials Science, Faculty of Engineering, Kumamoto University
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- Okazaki Kenji
- Department of Chemical and Materials Engineering, University of Kentucky
書誌事項
- タイトル別名
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- Effect of Ni and Ni<SUB>3</SUB>Al Additions on Sintering of Molybdenum Powders
- Effect of Ni and Ni3Al Additions on Sin
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抄録
Sintering of molybdenum powders normally requires very high temperatures to obtain high achieved densities. A small addition of pure nickel powders, however, not only lowers the sintering temperature of Mo but also remarkably increases its sintered density. For example, a 2 mass% addition produces a 94% achieved density even at one-half of the homologous temperature for Mo, the achieved density strongly depending on the sintering temperature. The sintering proceeds quickly with a lower activation energy (143 kJ/mol) compared to the Mo bulk diffusion energy, and the entire sintering is accomplished in a rather short period of time.<BR>On the other hand, when Ni-10 mass% Al powders mostly comprised of an f.c.c. Ni3Al phase are added, the sintering temperature is further lowered compared to the case of Ni addition, and the achieved density is greatly increased at a much higher rate. The activation energy for densification (104.8 kJ/mol) is less than that obtained by adding Ni.<BR>A Mo-5 mass% (Ni-10 mass% Al) powder mixture sintered at 1573 K exhibits excellent flexial and tensile strengths at ambient temperature. The tensile strength of 880 MPa at room temperature is reduced by only 9% even at 773 K, suggesting a possible application of this material at elevated temperature.
収録刊行物
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- Materials Transactions, JIM
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Materials Transactions, JIM 38 (4), 326-333, 1997
社団法人 日本金属学会
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詳細情報 詳細情報について
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- CRID
- 1390282679223926784
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- NII論文ID
- 130003556912
- 10002452342
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- NII書誌ID
- AA10699969
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- COI
- 1:CAS:528:DyaK2sXjvVamtr0%3D
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- ISSN
- 2432471X
- 09161821
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- NDL書誌ID
- 4209552
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
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- 使用不可