The effect of microstructure control on mechanical properties of 12Ce-TZP via two-step sintering method

JOURNAL OF ALLOYS AND COMPOUNDS

卷:711

Article

Zhang, Wen¹  Bao, Jinxiao¹  Jia, Guoxing¹  Guo, Wenrong¹  Song, Xiwen¹  An, Shengli¹ 

[1] Inner Mongolia Univ Sci & Technol, Sch Met & Mat, Inner Mongolia Key Lab Adv Ceram & Device, Baotou 014010, Peoples R China

关键词: 12Ce-TZP ceramics;    Two-step sintering;    Microstructure;    Mechanical properties;   

DOI  :  10.1016/j.jallcom.2017.04.059

来源: Elsevier

【 摘 要 】

The nanopowders of 12Ce-TZP were synthesized by a solid state reaction method and the effect of two-step sintering (TSS) on the microstructures and mechanical properties of the ceramics were studied. The samples obtained by conventional sintering (CS) exhibit approximately 2.5 mu m in grain size and only 6.99 GPa in Vickers hardness, as well as 425 MPa in bending strength. To control the microstructure and consequently optimize the mechanical properties, different TSS regimes were conducted. The results indicate that first firing at 1450 degrees C for 1 min followed by cooling down to 1300 degrees C with a soaking time of 30 h results in a highly densified (98.4% TD) ceramic with optimal mechanical properties (9.22 +/- 0.26 GPa, 14.7 +/- 0.66 MPa m(1/2), 501.40 +/- 16.21 MPa) and without significant grain growth (similar to 1 mu m). This provides an economic and effective approach to controlling the microstructure and thereby improving the mechanical properties of 12Ce-TZP ceramics. (C) 2017 Elsevier B.V. All rights reserved.

【 授权许可】

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