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      Physical and mechanical properties of hot-press sintering ternary CM 2A 8 (CaMg 2Al 16O 27) and C 2M 2A 14 (Ca 2Mg 2Al 28O 46) ceramics

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          Abstract

          The new ternary CM 2A 8 (CaMg 2Al 16O 27) and C 2M 2A 14 (Ca 2Mg 2Al 28O 46) pure and dense ceramics were first prepared by a hot-press sintering technique, and their physical and mechanical properties were investigated. The purity of obtained CM 2A 8 and C 2M 2A 14 ceramics reaches 98.1 wt% and 97.5 wt%, respectively. Their microstructure is dense with few observable pores, and their grain size is about a few dozen microns. For their physical properties, the average apparent porosity of CM 2A 8 and C 2M 2A 14 ceramics is 0.18% and 0.13%, and their average bulk density is 3.66 g/cm 3 and 3.71 g/cm 3, respectively. The relative density of CM 2A 8 ceramic is 98.12% and that of C 2M 2A 14 ceramic is 98.67%. The thermal expansivity (50–1400 ℃) of CM 2A 8 and C 2M 2A 14 ceramics is 9.24×10 –6 K –1 and 8.92×10 –6 K –1, respectively. The thermal conductivity of CM 2A 8 and C 2M 2A 14 ceramic is 21.32 W/(m·K) and 23.25 W/(m·K) at 25 ℃ and 18.76 W/(m·K) and 19.42 W/(m·K) as temperature rises to 350 ℃, respectively. In addition, the mechanical properties are also achieved. For CM 2A 8 ceramic, the flexural strength is 248 MPa, the fracture toughness is 2.17 MPa·m 1/2, and the Vickers hardness is 12.26 GPa. For C 2M 2A 14 ceramic, the flexural strength is 262 MPa, the fracture toughness is 2.23 MPa·m 1/2, and the Vickers hardness is 12.95 GPa.

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          Author and article information

          Journal
          Journal of Advanced Ceramics
          Journal of Advanced Ceramics
          Tsinghua University Press (Tsinghua University, Beijing 100084, China )
          2226-4108
          05 September 2018
          : 07
          : 03
          : 229-236 (pp. )
          Affiliations
          aSchool of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
          bCollaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, China
          cShandong Shengchuan Ceramics Co., Ltd., Shandong 255100, China
          dSchool of Architecture and Construction, Hebei University of Architecture, Zhangjiakou 075000, China
          Author notes
          * Corresponding authors. E-mail: J. Chen, cjh2666@ 123456126.com
          Article
          2226-4108-07-03-229
          10.1007/s40145-018-0274-4

          This work is licensed under a Creative Commons Attribution 4.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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