Detail publikace
Activated Sintering of Cr2O3-Based Composites by Hot Pressing
GEVORKYAN, E. CEPOVA, L. RUCKI, M. NERUBATSKYI, V. MOROZOW, D. ZUROWSKI, W. BARSAMYAN,V. KOUŘIL, K.
Anglický název
Activated Sintering of Cr2O3-Based Composites by Hot Pressing
Typ
článek v časopise ve Web of Science, Jimp
Jazyk
en
Originální abstrakt
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.
Anglický abstrakt
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.
Klíčová slova anglicky
composite; chromium oxide; reactive sintering; solid solution; phase boundaries
Vydáno
29.08.2022
Nakladatel
MDPI
Místo
BASEL
ISSN
1996-1944
Ročník
15
Číslo
17
Počet stran
15
BIBTEX
@article{BUT179327,
author="Karel {Kouřil},
title="Activated Sintering of Cr2O3-Based Composites by Hot Pressing",
year="2022",
volume="15",
number="17",
month="August",
publisher="MDPI",
address="BASEL",
issn="1996-1944"
}