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Acta Armamentarii ›› 2025, Vol. 46 ›› Issue (3): 240117-.doi: 10.12382/bgxb.2024.0117

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Effect of Y3Al5O12 on Microstructure and Mechanical Properties of B4C Ceramics Prepared by Hot-press Sintering

ZHANG Wei1,*(), ZHANG Jie1,2   

  1. 1 Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, Liaoning, China
    2 School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, Liaoning, China
  • Received:2024-02-22 Online:2025-03-26
  • Contact: ZHANG Wei

Abstract:

To investigate the effect of Y3Al5O12 sintering additive on B4C ceramics prepared by hot-press sintering,B4C ceramics are prepared using B4C powders as the raw material and Y3Al5O12 generated from the in-situ reaction between Al2O3 and Y2O3 as the sintering additive by hot-press sintering process at the sintering temperature of 1950℃.The effects of different contents of Y3Al5O12 sintering additive on the phase composition,sintering properties,microstructure,and mechanical properties of B4C ceramics are studied.The results show that the grain boundaries in the B4C ceramics exist in two forms of B4C-B4C clean grain boundaries and B4C-amorphous Y3Al5O12-B4C grain boundaries when the content of Y3Al5O12 sintering additive is less than 7 wt.%,and the grain boundaries in the B4C ceramics exist in three forms of B4C-B4C clean grain boundaries,B4C-amorphous Y3Al5O12-B4C grain boundaries and B4C-crystallised Y3Al5O12-B4C grain boundaries when the content of Y3Al5O12 sintering additive is more than or equal to 7wt.%.When the content of Y3Al5O12 sintering additive is 7wt.%,the best properties of B4C ceramics are achieved by hot-press sintering.The relative density,Vickers hardness,bending strength,and fracture toughness of B4C ceramics are 96.2%,20.9GPa,455MPa,and 3.53MPa·m1/2,respectively.The Y3Al5O12 sintering additive affects the mechanical properties of B4C ceramics prepared by hot press sintering by altering their porosity,grain size,and grain boundary characteristics.

Key words: B4C ceramics, sintering additive, yttrium aluminum garnet, mechanical property, grain boundary

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