Publication detail

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.

English title

Activated Sintering of Cr2O3-Based Composites by Hot Pressing

Type

journal article in Web of Science

Language

en

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.

English 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 in English

composite; chromium oxide; reactive sintering; solid solution; phase boundaries

Released

29.08.2022

Publisher

MDPI

Location

BASEL

ISSN

1996-1944

Volume

15

Number

17

Pages count

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"
}