A study on in situ growth of TaC whiskers in Al2O3 matrix powder for ceramic cutting tools |
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| Authors: | Guolong Zhao Chuanzhen Huang Hanlian Liu Liang Xu Xuewen Chong Bin Zou Hongtao Zhu |
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| Affiliation: | 1. Centre for Advanced Jet Engineering Technologies (CaJET), School of Mechanical Engineering, Shandong University, Jinan 250061, PR China;2. Key Laboratory of High-efficiency and Clean Mechanical Manufacture (Shandong University), Ministry of Education, PR China;1. Key Laboratory of Semiconductor Materials Science, Institute of Semiconductors, Chinese Academy of Sciences, 100083 Beijing, China;2. College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Sciences, 100049 Beijing, China;3. School of Electrical Engineering and Computer Science, and Key Laboratory for the Physics and Chemistry of Nanodevices, Peking University, 100871 Beijing, China;4. National Key Laboratory of Science and Technology on Vacuum Technology and Physics, Lanzhou Institute of Space Technology and Physics, P.O. BOX 94, 730000 Lanzhou, China;1. Department of Electronics Engineering, Indian School of Mines (I.S.M), Dhanbad, 826004, India;2. Institute of Radio Physics and Electronics, 92, A.P.C. Road, Kolkata, 700009, India;1. Research Center for Integrated Quantum Electronics (RCIQE), Hokkaido University, Kita-ku, Sapporo 060-8628, Japan;2. CNRS-Laboratoire de Photonique et de Nanostructures, Route de Nozay, 91460 Marcoussis, France;1. Department of Applied Physics, Kyung Hee University, Yongin 446-701, Republic of Korea;2. Department of Physics, Chonbuk National University, Jeonju 561-756, Republic of Korea;3. Korea Research Institute of Standards and Science, Daejeon 305-340, Republic of Korea;4. Department of Nano Science, University of Science and Technology (UST), Yuseong, 305-333 Daejeon, Republic of Korea;5. Department of Physics, Yeungnam University, Gyeonbuk 712-749, Republic of Korea |
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| Abstract: | In situ growth of tantalum carbide (TaC) whiskers was synthesized in an α-Al2O3 matrix powder via a carbothermal reduction technique within a temperature range of 1350–1500 °C in an argon atmosphere. The starting materials consisted of Ta2O5, C, Ni and NaCl powders. Different mixing methods and various reaction temperatures were employed. Most of the prepared whiskers were 0.2–0.5 μm in diameter and 5–15 μm in length. The reaction temperature of 1400–1450 °C was suitable for the growth of TaC whiskers and a wet mixing method was beneficial to increase the whisker yield. Some of the whiskers exhibited the needle shape while others exhibited the screw shape. The growth mechanism of the whiskers was a complex mechanism involving a helical screw dislocation mechanism and a vapor–liquid–solid process. No obvious influences of the Al2O3 matrix powder on the growth of TaC whiskers were found and the major impurities in the obtained powder were TaC particles, nickel and unreacted carbon. |
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