Reinforcement of the Ceramic Matrix of CaO-ZrO<sub>2</sub>-MgO with Al<sub>2</sub>O<sub>3</sub> Coarse Particles
A thermal protection system is subject to high forces, in particular compression, bending and wear, to aggressive environments of high temperatures, high velocity gases and particle shock. Typically, ceramic materials appear as a first barrier or outer shield over a metallic substrate responsible fo...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-03-01
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| Series: | Ceramics |
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| Online Access: | https://www.mdpi.com/2571-6131/5/1/13 |
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| author | João Mamede Duarte Felix Macedo Alberto Maceiras Abílio P. Silva |
| author_facet | João Mamede Duarte Felix Macedo Alberto Maceiras Abílio P. Silva |
| author_sort | João Mamede |
| collection | DOAJ |
| description | A thermal protection system is subject to high forces, in particular compression, bending and wear, to aggressive environments of high temperatures, high velocity gases and particle shock. Typically, ceramic materials appear as a first barrier or outer shield over a metallic substrate responsible for the structure. When it comes to a coating due to the small thickness, the particles of the raw material are sub-micron scale, but when a shield with a few centimeters is built its structural and economic viability requires the use of wider particle size distributions. In this work, a ceramic fine-grained matrix of CaO-ZrO<sub>2</sub>-MgO was reinforced with commercial coarse Al<sub>2</sub>O<sub>3</sub> particles. The results show that for larger size distributions, CZM-4A, replacing 63% of fine-grained matrix by coarse Al<sub>2</sub>O<sub>3</sub> particles, the dimensional stability is obtained (Δ<i>L</i> = 5%) and the good mechanical properties such as flexural strength of 154 MPa, elastic modulus of 286 GPa, and hardness of 8.5 GPa, which allows to propose this ceramic composite for a structural application. |
| first_indexed | 2024-03-09T20:00:39Z |
| format | Article |
| id | doaj.art-189cf729c82249f897594f64096d9b03 |
| institution | Directory Open Access Journal |
| issn | 2571-6131 |
| language | English |
| last_indexed | 2024-03-09T20:00:39Z |
| publishDate | 2022-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Ceramics |
| spelling | doaj.art-189cf729c82249f897594f64096d9b032023-11-24T00:45:28ZengMDPI AGCeramics2571-61312022-03-015114816010.3390/ceramics5010013Reinforcement of the Ceramic Matrix of CaO-ZrO<sub>2</sub>-MgO with Al<sub>2</sub>O<sub>3</sub> Coarse ParticlesJoão Mamede0Duarte Felix Macedo1Alberto Maceiras2Abílio P. Silva3Centre for Mechanical and Aerospace Science and Technologies (C-MAST), Universidade da Beira Interior, Rua Marquês d’Ávila e Bolama, 6201-001 Covilhã, PortugalCentre for Mechanical and Aerospace Science and Technologies (C-MAST), Universidade da Beira Interior, Rua Marquês d’Ávila e Bolama, 6201-001 Covilhã, PortugalCentre for Mechanical and Aerospace Science and Technologies (C-MAST), Universidade da Beira Interior, Rua Marquês d’Ávila e Bolama, 6201-001 Covilhã, PortugalCentre for Mechanical and Aerospace Science and Technologies (C-MAST), Universidade da Beira Interior, Rua Marquês d’Ávila e Bolama, 6201-001 Covilhã, PortugalA thermal protection system is subject to high forces, in particular compression, bending and wear, to aggressive environments of high temperatures, high velocity gases and particle shock. Typically, ceramic materials appear as a first barrier or outer shield over a metallic substrate responsible for the structure. When it comes to a coating due to the small thickness, the particles of the raw material are sub-micron scale, but when a shield with a few centimeters is built its structural and economic viability requires the use of wider particle size distributions. In this work, a ceramic fine-grained matrix of CaO-ZrO<sub>2</sub>-MgO was reinforced with commercial coarse Al<sub>2</sub>O<sub>3</sub> particles. The results show that for larger size distributions, CZM-4A, replacing 63% of fine-grained matrix by coarse Al<sub>2</sub>O<sub>3</sub> particles, the dimensional stability is obtained (Δ<i>L</i> = 5%) and the good mechanical properties such as flexural strength of 154 MPa, elastic modulus of 286 GPa, and hardness of 8.5 GPa, which allows to propose this ceramic composite for a structural application.https://www.mdpi.com/2571-6131/5/1/13ceramic compositesCaZrO<sub>3</sub>-MgOAl<sub>2</sub>O<sub>3</sub>particle size distributionmechanical properties |
| spellingShingle | João Mamede Duarte Felix Macedo Alberto Maceiras Abílio P. Silva Reinforcement of the Ceramic Matrix of CaO-ZrO<sub>2</sub>-MgO with Al<sub>2</sub>O<sub>3</sub> Coarse Particles Ceramics ceramic composites CaZrO<sub>3</sub>-MgO Al<sub>2</sub>O<sub>3</sub> particle size distribution mechanical properties |
| title | Reinforcement of the Ceramic Matrix of CaO-ZrO<sub>2</sub>-MgO with Al<sub>2</sub>O<sub>3</sub> Coarse Particles |
| title_full | Reinforcement of the Ceramic Matrix of CaO-ZrO<sub>2</sub>-MgO with Al<sub>2</sub>O<sub>3</sub> Coarse Particles |
| title_fullStr | Reinforcement of the Ceramic Matrix of CaO-ZrO<sub>2</sub>-MgO with Al<sub>2</sub>O<sub>3</sub> Coarse Particles |
| title_full_unstemmed | Reinforcement of the Ceramic Matrix of CaO-ZrO<sub>2</sub>-MgO with Al<sub>2</sub>O<sub>3</sub> Coarse Particles |
| title_short | Reinforcement of the Ceramic Matrix of CaO-ZrO<sub>2</sub>-MgO with Al<sub>2</sub>O<sub>3</sub> Coarse Particles |
| title_sort | reinforcement of the ceramic matrix of cao zro sub 2 sub mgo with al sub 2 sub o sub 3 sub coarse particles |
| topic | ceramic composites CaZrO<sub>3</sub>-MgO Al<sub>2</sub>O<sub>3</sub> particle size distribution mechanical properties |
| url | https://www.mdpi.com/2571-6131/5/1/13 |
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