期刊
CERAMICS INTERNATIONAL
卷 39, 期 2, 页码 2093-2105出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2012.08.065
关键词
Pulsed electric current sintering; Nanocomposites; Mechanical properties; Al2O3
资金
- Tekes
- consortium of Finnish companies (NEWCON-HTLF)
- Academy of Finland
- [KICOS 2008-0143]
Dense Al2O3-15 wt% (ZrO2-3 mol%Y2O3) nanocomposites modified with 3 wt% of self-lubricating component (CaF2, BaF2, MoS2, WS2, h-BN, or graphite) were consolidated by pulsed electric current sintering. Their microstructure as well as mechanical and tribological properties were evaluated. During consolidation composition of the self-lubricating components was conserved except for BaF2, which partially melted. The Al2O3/ZrO2(3 mol%Y2O3) matrix showed hardness of 20.35 GPa and Young's modulus of 320 GPa determined by Vickers indentation. All solid lubricant additives led to a decrease in hardness of the composite. Solid lubricant additives lowered the coefficient of friction (CoF) against alumina at room temperature. In pin-on-disc tests CoF of 0.38-0.42 was measured for all the materials against alumina ball. The lowest CoF of 0.043 was measured for Al2O3/ZrO2(3 mol%Y2O3)/CaF2 in the scratch test against diamond stylus while the matrix material showed lower friction than other materials. The measured wear rates were in the order Of 10(-12) for Al2O3/ZrO2(3 mol%Y2O3)/CaF2, Al2O3/ZrO2(3 mol%Y2O3)/MoS2, and Al2O3/ZrO2(3 mol%Y2O3)/WS2. (C) 2012 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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