Experimental study of ceramic coatings on lower-density ceramic substrates
Abstract Adhesion and homogeneity of the coating-substrate were analyzed on the basis of the establishment of coating mineralogy. Substrate raw materials used were kaolin clay and a calcined alumina 4 µm; a series of higher density ceramic coatings were deposited using calcined aluminas 0.5 µm and 4...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Associação Brasileira de Cerâmica
2023-07-01
|
| Series: | Cerâmica |
| Subjects: | |
| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0366-69132023000200125&lng=en&tlng=en |
| _version_ | 1797777962873913344 |
|---|---|
| author | C. I. Torres C. P. Miquelarena G. L. Bianchi |
| author_facet | C. I. Torres C. P. Miquelarena G. L. Bianchi |
| author_sort | C. I. Torres |
| collection | DOAJ |
| description | Abstract Adhesion and homogeneity of the coating-substrate were analyzed on the basis of the establishment of coating mineralogy. Substrate raw materials used were kaolin clay and a calcined alumina 4 µm; a series of higher density ceramic coatings were deposited using calcined aluminas 0.5 µm and 4 µm, silica fume, and talc. The dip coating technique was applied to all substrates and later sintered at 1300 ºC. Shrinkage and density of coatings mixtures and substrate were separately evaluated. X-ray diffraction was utilized to identify the crystalline phases present in the coatings, while optical and electron microscopy were employed for the structural characterization of the coatings. Coatings exhibited lower shrinkage compared to the substrate. Among the specimens that exhibited good adhesion, cracks were observed to extend parallel to the substrate surface. The presence of cristobalite on the coating indicated that the failure mechanism involved buckling. The crack dimension presented on the coating decreased after adding talc to the mixture. |
| first_indexed | 2024-03-12T23:10:31Z |
| format | Article |
| id | doaj.art-63ccb7ed4b364a329e23a5bc8da1dbdc |
| institution | Directory Open Access Journal |
| issn | 1678-4553 |
| language | English |
| last_indexed | 2024-03-12T23:10:31Z |
| publishDate | 2023-07-01 |
| publisher | Associação Brasileira de Cerâmica |
| record_format | Article |
| series | Cerâmica |
| spelling | doaj.art-63ccb7ed4b364a329e23a5bc8da1dbdc2023-07-18T07:41:51ZengAssociação Brasileira de CerâmicaCerâmica1678-45532023-07-016939012513210.1590/0366-69132023693903375Experimental study of ceramic coatings on lower-density ceramic substratesC. I. Torreshttps://orcid.org/0000-0003-1227-9478C. P. MiquelarenaG. L. BianchiAbstract Adhesion and homogeneity of the coating-substrate were analyzed on the basis of the establishment of coating mineralogy. Substrate raw materials used were kaolin clay and a calcined alumina 4 µm; a series of higher density ceramic coatings were deposited using calcined aluminas 0.5 µm and 4 µm, silica fume, and talc. The dip coating technique was applied to all substrates and later sintered at 1300 ºC. Shrinkage and density of coatings mixtures and substrate were separately evaluated. X-ray diffraction was utilized to identify the crystalline phases present in the coatings, while optical and electron microscopy were employed for the structural characterization of the coatings. Coatings exhibited lower shrinkage compared to the substrate. Among the specimens that exhibited good adhesion, cracks were observed to extend parallel to the substrate surface. The presence of cristobalite on the coating indicated that the failure mechanism involved buckling. The crack dimension presented on the coating decreased after adding talc to the mixture.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0366-69132023000200125&lng=en&tlng=enAl2O3-SiO2-MgOdip coatingclay substratesintering effortbrittle fracture |
| spellingShingle | C. I. Torres C. P. Miquelarena G. L. Bianchi Experimental study of ceramic coatings on lower-density ceramic substrates Cerâmica Al2O3-SiO2-MgO dip coating clay substrate sintering effort brittle fracture |
| title | Experimental study of ceramic coatings on lower-density ceramic substrates |
| title_full | Experimental study of ceramic coatings on lower-density ceramic substrates |
| title_fullStr | Experimental study of ceramic coatings on lower-density ceramic substrates |
| title_full_unstemmed | Experimental study of ceramic coatings on lower-density ceramic substrates |
| title_short | Experimental study of ceramic coatings on lower-density ceramic substrates |
| title_sort | experimental study of ceramic coatings on lower density ceramic substrates |
| topic | Al2O3-SiO2-MgO dip coating clay substrate sintering effort brittle fracture |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0366-69132023000200125&lng=en&tlng=en |
| work_keys_str_mv | AT citorres experimentalstudyofceramiccoatingsonlowerdensityceramicsubstrates AT cpmiquelarena experimentalstudyofceramiccoatingsonlowerdensityceramicsubstrates AT glbianchi experimentalstudyofceramiccoatingsonlowerdensityceramicsubstrates |