High‐Strength ZrC Ceramics Doped with Aluminum. Issue 11 (24th September 2014)

• Record Type: Journal Article
• Authors: Wang, Xin‐Gang; Zhang, Guo‐Jun; Zhao, Jian; Xue, Jia‐Xiang; Xu, Chang‐Ming; Wang, Pei‐Ling; Jayaram, V.
• Is Part Of: Journal of the American Ceramic Society. Volume 97:Issue 11(2014)
• Page Start: 3367
• Page End: 3370
• Publication Date: 2014-09-24
• Subjects: Ceramics -- Periodicals; 620.1405
• DOI: 10.1111/jace.13252
• Languages: English
• ISSNs: 0002-7820

Abstract

<abstract abstract-type="main" id="jace13252-abs-0001"> <title> <x xml:space="preserve">Abstract</x> </title> <p>High‐strength ZrC ceramics with relative density above 98% were prepared by reactive hot pressing of ZrC and Al at 1900°C. The reaction between ZrC and Al resulted in the formation of ZrC_{1−<italic>x</italic>}, Zr₃Al₃C₅ and Zr–Al compound such as AlZr₃ and Al–C–Zr. The intermediate product AlZr₃ below 1600°C and remained Al–C–Zr phase could form liquid phase and promoted the first stage of densification process. The improvement in densification behavior at higher temperatures (1800°C–1900°C) could be attributed to the formation of nonstoichiometric ZrC_{1−<italic>x</italic>}. Adding 5 wt% and 7.5 wt% Al to ZrC, the formed ZrC_0.85–Zr₃Al₃C₅ and ZrC_0.80–Zr₃Al₃C₅ based ceramics had 3‐point bending strength as high as 757 ± 79 MPa and 967 ± 50 MPa, respectively, with hardness and fracture toughness being 16.2–18.3 GPa and 3.3–3.5 MPa m^1/2, respectively.</p> </abstract>