Effects of mechanically alloying Al2O3 and Y2O3 additives on the liquid phase sintering behavior and properties of SiC

Chen, Ruoyu; Bratten, Adam; Rittenhouse, Joshua; Wen, Haiming

doi:10.1016/j.ceramint.2022.07.089

Effects of mechanically alloying Al₂O₃ and Y₂O₃ additives on the liquid phase sintering behavior and properties of SiC

Journal Article · Wed Jul 13 00:00:00 EDT 2022 · Ceramics International

DOI:https://doi.org/10.1016/j.ceramint.2022.07.089· OSTI ID:2424225

Chen, Ruoyu ^[1]; ^[2]; ^[2]; ^[2]

Anhui University of Technology (China); Missouri University of Science and Technology, Rolla, MO (United States)
Missouri University of Science and Technology, Rolla, MO (United States)

In order to improve the sintering of SiC, mixtures of Al₂O₃ and Y₂O₃ powders are commonly included as sintering additives. The aim of this work was to use mechanically alloyed Al₂O₃–Y₂O₃ mixtures as sintering additives to promote liquid phase sintering of SiC using spark plasma sintering. The results showed that milling reduced the particle size of the powders and led to the formation of complex oxide phases (YAP, YAM, and YAG) at low temperatures. As the ball milling time increased, the mass loss of specimens sintered with mechanically alloyed Al₂O₃–Y₂O₃ mixtures decreased, and accordingly the relative density increased. However, the hardness and flexural strength of sintered SiC specimens first increased and then decreased. Because the specimens prepared with oxides milled for a long time contained too much YAG/YAP and accordingly too much liquid at sintering temperature. This negatively affected the mechanical properties of the SiC specimens because of the increased volume of the complex oxide phases, which have inferior mechanical properties to SiC, in the sintered specimens. In conclusion, when the ball milling time was 6h, the hardness (24.02 GPa) and flexural strength (655.61 MPa) of the SiC specimens reached maximum values.

View Accepted Manuscript (DOE)

Research Organization:: Missouri Univ. of Science and Technology, Rolla, MO (United States)

Sponsoring Organization:: Nanjing University of Aeronautics and Astronautics; U.S. Nuclear Regulatory Commission Faculty Development Program; USDOE Office of Nuclear Energy (NE)

Grant/Contract Number:: AC07-05ID14517

OSTI ID:: 2424225

Alternate ID(s):: OSTI ID: 1960595

Journal Information:: Ceramics International, Journal Name: Ceramics International Journal Issue: 21 Vol. 48; ISSN 0272-8842

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
Al2O3–Y2O3
Materials Science
Mechanical alloying
Mechanical properties
SiC
Sintering additives

Effects of mechanically alloying Al2O3 and Y2O3 additives on the liquid phase sintering behavior and properties of SiC

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Effects of mechanically alloying Al₂O₃ and Y₂O₃ additives on the liquid phase sintering behavior and properties of SiC