Abstract
Single-phase (binderless) superhard nanopolycrystalline diamond and cubic boron nitride (cBN) consisting of fine grains of several tens of nanometers without any secondary phases or binder materials have been developed. These nanopolycrystalline materials are synthesized by direct conversion sintering under ultrahigh pressure and high temperature with optimized and precisely controlled starting materials and synthesis conditions. Their hardness surpasses that of single crystals and conventional sintered compacts and is free from the characteristic cleavage and anisotropy of single crystals. They are especially promising materials for next-generation high-precision, high-efficiency cutting tools and wear-resistant tools. The nanopolycrystalline diamond has excellent potential for precision cutting of nonferrous hard materials, including cemented carbide and hard ceramics, as does the nanopolycrystalline cBN for cutting ferrous hard metals.
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H. Sumiya, SEI Tech. Rev. 74, 15 (2012).
H. Sumiya, K. Harano, Diam. Relat. Mater. 24, 44 (2012).
K. Harano, T. Satoh, H. Sumiya, Diam. Relat. Mater. 24, 78 (2012).
H. Sumiya, S. Uesaka, S. Satoh, J. Mater. Sci. 35, 1181 (2000).
S. Uesaka, H. Sumiya, H. Itozaki, J. Shiraishi, K. Tomita, T. Nakai, SEI Tech. Rev. 50, 34 (2000).
H. Sumiya, K. Harano, Y. Ishida, Diam. Relat. Mater. 41, 14 (2014).
F.P. Bundy, Science 137, 1057 (1962).
M. Wakatsuki, K. Ichinose, T. Aoki, Jpn. J. Appl. Phys. 11, 578 (1972).
S. Naka, K. Horii, Y. Takeda, T. Hanawa, Nature 259, 38 (1976).
T. Irifune, A. Kurio, S. Sakamoto, T. Inoue, H. Sumiya, Nature 421, 599 (2003).
N. Dubrovinskaia, L. Dubrovinsky, W. Crichton, F. Langenhorst, A. Richter, Appl. Phys. Lett. 87, 083106 (2005).
F.P. Bundy, R.H. Wentorf Jr., J. Chem. Phys. 38, 1144 (1963).
M. Wakatsuki, K. Ichinose, T. Aoki, Mater. Res. Bull. 7, 999 (1972).
F.R. Corrigan, F.P. Bundy, J. Chem. Phys. 63, 3812 (1975).
M. Akaishi, T. Satoh, M. Ishii, T. Taniguchi, S. Yamaoka, J. Mater. Sci. Lett. 12, 1883 (1993).
N. Dubrovinskaia, V.L. Solozhenko, N. Miyajima, V. Dmitriev, O.O. Kurakevych, L. Dubrovinsky, Appl. Phys. Lett. 90, 101912 (2007).
H. Sumiya, J. Soc. Mater Sci. Japan 61, 412 (2012).
H. Sumiya, H. Yusa, T. Inoue, H. Ofuji, T. Irifune, High Press. Res. 26, 63 (2006).
H. Sumiya, T. Irifune, J. Mater. Res. 22, 2345 (2007).
H. Sumiya, K. Harano, Y. Ishida, Diam. Relat. Mater 48, 47 (2014).
H. Sumiya, T. Irifune, A. Kurio, S. Sakamoto, T. Inoue, J. Mater. Sci. 39, 445 (2004).
Y. Ishida, H. Sumiya, Proc. 2012 Powder Metall. World Congr. Exhib. (2012). p. 18D-T13-28.
K. Harano, K. Arimoto, Y. Ishida, H. Sumiya, Adv. Mater. Res. 1017, 389 (2014).
H. Sumiya, T. Irifune, SEI Tech. Rev. 59, 52 (2005).
H. Sumiya, K. Harano, D. Murakami, SEI Tech. Rev. 75, 18 (2012).
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Sumiya, H. Novel superhard nanopolycrystalline materials synthesized by direct conversion sintering under high pressure and high temperature. MRS Bulletin 42, 729–733 (2017). https://doi.org/10.1557/mrs.2017.212
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DOI: https://doi.org/10.1557/mrs.2017.212