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Development of matrix microstructure in polycrystalline cubic boron nitride ceramics

Kristina Lindgren (Institutionen för fysik, Materialens mikrostruktur (Chalmers)) ; A. Kauppi ; Lena K. L. Falk (Institutionen för fysik, Materialens mikrostruktur (Chalmers))
Journal of the European Ceramic Society (09552219). Vol. 37 (2017), 9, p. 3017-3026.
[Artikel, refereegranskad vetenskaplig]

The development of matrix microstructure in polycrystalline cubic boron nitride cutting tool materials has been investigated by X-ray diffraction and scanning and transmission electron microscopy combined with energy dispersive X-ray spectrometry. The materials had a matrix based on Ti(C,O,N) and Al and were fabricated from powder mixtures milled with either WC-Co cemented carbide or (Ti,W)(C,N)-Co cermet milling media. The introduction of WC-Co debris resulted in the formation of an Al- and W-rich liquid phase during high pressure high temperature sintering. Crystalline intergranular phases rich in W partitioned from this liquid. Debris from the cermet milling media resulted in the formation of intergranular Co2B; the W was retained in the (Ti,W)(C,N) structure during sintering. Al-rich reaction zones on cBN grain surfaces developed locally during high pressure high temperature sintering. © 2017 Elsevier Ltd

Nyckelord: Cermet milling media; Microstructure; PCBN; Titanium oxide nitride carbide; WC-Co cemented carbide milling media



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Denna post skapades 2017-06-14. Senast ändrad 2017-07-11.
CPL Pubid: 249795

 

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