Features of calcium hexaaluminate formation in alumina-zirconia ceramics

Features of calcium hexaaluminate formation in alumina-zirconia ceramics Full article

Conference

IХ Международная Российско-Казахстанская научно-практическая конференция «Химические технологии функциональных материалов»
25-27 May 2023 , Новосибирск

Journal

Chimica Techno Acta
ISSN: 2411-1414

Output data

Year: 2023, Volume: 10, Number: 3, Article number : 202310317, Pages count : 7 DOI: 10.15826/chimtech.2023.10.3.17

Tags

CaAl12O19; alumina-zirconia; synchrotron; fracture toughness; platelets; TEM

Authors

Cherkasova N. Yu. ¹ , Antropova K. A. ¹ , Kuzmin Ruslan Izatovich ¹ , Emurlaev Kemal Ismetovich ^1,2 , Kuchumova Ivanna Denisovna ^1,3 , Burkhinova Nomina ¹ , Zobova Yulia ¹

Affiliations

1	Novosibirsk State Technical University
2	Центр коллективного пользования "Сибирский кольцевой источник фотонов" Института катализа СО РАН им. Г.К. Борескова СО РАН
3	Lavrentyev Institute of Hydrodynamics

Alumina-zirconia composites containing calcium hexaaluminate in the amount from 0 to 15 wt.% were investigated. The materials were obtained by water dispersion, granulation, axial pressing, and free sintering. Density and open porosity were determined by the hydrostatic weighing method. Phase analysis was performed using synchrotron radiation. Structural investigations were conducted using scanning and transmission electron microscopy. Vickers hardness was determined at a load of 10 kg. Fracture toughness was determined by the indentation method. With increasing CaAl12O19 content in the composites, the relative density decreased from 98.5% to 91.8%, and the open porosity increased from 0.2 to 1.4%. The lattice parameters of t-ZrO2 crystal lattice did not change up to 12 wt.% CaAl12O19, and the degree of tetragonality was 1.435. The degree of tetragonality decreased for the material with 15 wt.% CaAl12O19 and reached 1.420. The lattice parameters of CaAl12O19 decreased with increasing content. Platelet size increased with increasing calcium hexaaluminate content. For the materials containing up to 9 wt.% CaAl12O19, the average length of the platelets was 2 μm, the width was 0.4 μm, and the aspect ratio was 5. For the material with maximum calcium hexaaluminate content, the average length of the platelets was 4.2 μm, the width was 0.6 μm, and the aspect ratio was 7. With increasing CaAl12O19 content, the hardness decreased from 1700±25 to 1390±30 Hv, and the critical stress intensity factor increased by 34% to 6.7±0.3 MPa·m1/2.

Cherkasova N.Y. , Antropova K.A. , Kuzmin R.I. , Emurlaev K.I. , Kuchumova I.D. , Burkhinova N. , Zobova Y.
Features of calcium hexaaluminate formation in alumina-zirconia ceramics
Chimica Techno Acta. 2023. V.10. N3. 202310317 :1-7. DOI: 10.15826/chimtech.2023.10.3.17 Scopus РИНЦ OpenAlex

Submitted:	Sep 17, 2023
Accepted:	Oct 20, 2023
Published print:	Oct 20, 2023
Published online:	Oct 26, 2023

Scopus:	2-s2.0-85175530458
Elibrary:	55174878
OpenAlex:	W4388186238

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