Porous YbB6 Ceramics Prepared by In Situ Reaction between Yb2O3 and B4C Combined with Partial Sintering. Issue 7 (19th April 2015)

• Record Type: Journal Article
• Authors: Wang, Xiao‐Fei; Xiang, Hui‐Min; Sun, Xin; Liu, Jia‐Chen; Hou, Feng; Zhou, Yan‐Chun; Ohji, T.
• Is Part Of: Journal of the American Ceramic Society. Volume 98:Issue 7(2015)
• Page Start: 2234
• Page End: 2239
• Publication Date: 2015-04-19
• Subjects: Ceramics -- Periodicals; 620.1405
• DOI: 10.1111/jace.13606
• Languages: English
• ISSNs: 0002-7820

Abstract

<abstract abstract-type="main" id="jace13606-abs-0001"> <title> <x xml:space="preserve">Abstract</x> </title> <p>Porous YbB₆ ceramic, a member of the ultrahigh‐temperature (UHT) family, is successfully prepared from Yb₂O₃ and B₄C powders by <italic>in situ</italic> synthesis combined with partial sintering method. Due to the fact that pores can be produced using the gases such as B₂O₃ and CO generated in reaction between Yb₂O₃ and B₄C, phase‐pure porous YbB₆ ceramics are obtained after sintering the Yb₂O₃/B₄C green bodies at 1750°C for 2 h in a flowing argon atmosphere under ambient pressure without addition of pore‐forming agent. Using this new and simple method, the porosity and volume shrinkage of porous YbB₆ ceramics are controllable by changing the green density. The prepared porous YbB₆ ceramic has homogeneous pore structure with very narrow pore diameter distribution. Furthermore, the porous YbB₆ possesses high compressive strength of ~21.34 MPa when the porosity is ~58.7% and the density is ~2.27 g/cm³. The combination of these favorable properties renders porous YbB₆ ceramic being a light‐weight structural and functional component for UHT applications.</p> </abstract>