Thermal Properties of Porous Mullite Ceramics Modified with Microsized ZrO2 and WO3
Mahnicka-Goremikina L. Svinka R. Svinka V. Grase L. Juhnevica I. Rundans M. Goremikins V. Tolendiuly S. Fomenko S.
November 2022MDPI
Materials
2022#15Issue 22
Mullite ceramics are well known as materials with a high temperature stability, strength and creep resistance. In this research, the effect of a modification with magnesia-stabilized zirconia and yttria-stabilized zirconia, separately, as well as in a mixture with WO3, in 1:1 and 1:2 ratios on the thermal properties of porous mullite ceramics was investigated. The porous mullite-containing ceramics were prepared by a slip casting of the concentrated slurry of raw materials with the addition of a suspension of Al paste for the pore formation due to the H2 evolution as a result of the reaction of Al with water. The formed samples were sintered at 1600 °C and the holding time was 1 h. The materials were characterized using X-ray diffractometry, scanning electron microscopy, mercury porosimetry, the laser flash contactless method, thermal shock resistance testing and the non-destructive impulse excitation method for determining the elasticity modulus. The modification of the porous mullite ceramic with a mixture of ZrO2 and WO3 oxides had a positive effect by decreasing the thermal conductivity, due to the increased porosity, in comparison to the undoped samples and samples with only ZrO2. The doubling of the WO3 amount in the modifying oxide mixtures improved the ceramic thermal shock resistance. The porous mullite ceramics which were modified with magnesia-stabilized zirconia (2.8 mol% MgO) and WO3 had a lower thermal conductivity and improved thermal shock resistance than the samples with yttria-stabilized zirconia (8 mol% Y2O3) and WO3.
mullite , porous ceramic , thermal conductivity , thermal shock , tungsten oxide , zirconia
Text of the article Перейти на текст статьи
Institute of Materials and Surface Engineering, Faculty of Materials Science and Applied Chemistry, Riga Technical University, Paula Valdena St. 3/7, Riga, LV-1048, Latvia
Institute of Structural Engineering and Reconstruction, Riga Technical University, Kipsalas St. 6A, Riga, LV-1048, Latvia
Space Engineering Department, AUPET Named G. Daukeev, Baitursynov St., 126/1, Almaty, 050013, Kazakhstan
Institute of Combustion Problems, Bogenbay Batyr St. 172, Almaty, 050012, Kazakhstan
Institute of Materials and Surface Engineering
Institute of Structural Engineering and Reconstruction
Space Engineering Department
Institute of Combustion Problems
10 лет помогаем публиковать статьи Международный издатель
Книга Публикация научной статьи Волощук 2026 Book Publication of a scientific article 2026