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GEVORKYAN, E. CEPOVA, L. RUCKI, M. NERUBATSKYI, V. MOROZOW, D. ZUROWSKI, W. BARSAMYAN,V. KOUŘIL, K.
Original Title
Activated Sintering of Cr2O3-Based Composites by Hot Pressing
Type
journal article in Web of Science
Language
English
Original Abstract
The paper presents and discusses questions on structure formation during the sintering process of Cr2O3-based composites using the hot pressing method, when a chemical reaction between the components takes place. The task was difficult because Cr2O3 decomposes when sintered at temperatures above 1300 degrees C. The proposed novel method allowed for interaction between aluminum and chromia, thus avoiding the decomposition of the latter. Here, ultrafine aluminum powder played the role of the active agent forming a liquid phase and reacting with Cr2O3. The appearance of the solid solutions of (Cr,Al)(2)O-3 with different stoichiometry of Cr and Al depended on the aluminum content in the initial mixture. The solid solution significantly strengthened boundaries between composite phases, resulting in the composite material of high fracture toughness between 5 and 7 MPa m(1/2) and bending strength of ca. 500 MPa. The best mechanical properties exhibited the cermet with 22 wt.% of the restored chromium.
Keywords
composite; chromium oxide; reactive sintering; solid solution; phase boundaries
Authors
GEVORKYAN, E.; CEPOVA, L.; RUCKI, M.; NERUBATSKYI, V.; MOROZOW, D.; ZUROWSKI, W.; BARSAMYAN,V.; KOUŘIL, K.
Released
29. 8. 2022
Publisher
MDPI
Location
BASEL
ISBN
1996-1944
Periodical
Materials
Year of study
15
Number
17
State
Swiss Confederation
Pages count
URL
https://www.mdpi.com/1996-1944/15/17/5960
BibTex
@article{BUT179327, author="GEVORKYAN, E. and CEPOVA, L. and RUCKI, M. and NERUBATSKYI, V. and MOROZOW, D. and ZUROWSKI, W. and BARSAMYAN,V. and KOUŘIL, K.", title="Activated Sintering of Cr2O3-Based Composites by Hot Pressing", journal="Materials", year="2022", volume="15", number="17", pages="15", doi="10.3390/ma15175960", issn="1996-1944", url="https://www.mdpi.com/1996-1944/15/17/5960" }