Study of neck formation and densification in porous hydroxyapatite ceramics using thermal conductivity measurements
Neck formation and densification during sintering have strong effects on the thermal conductivity of a porous ceramic body. This has been described by an analytical model using grain conductivity, grain size, pore fraction and particle – particle contact area as input parameters. It has been tested...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2023-03-01
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| Series: | Open Ceramics |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2666539523000019 |
| _version_ | 1811154335033196544 |
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| author | David S. Smith Pierre Lefeuvre Maxence Renaux Benoit Nait-Ali Anne Leriche |
| author_facet | David S. Smith Pierre Lefeuvre Maxence Renaux Benoit Nait-Ali Anne Leriche |
| author_sort | David S. Smith |
| collection | DOAJ |
| description | Neck formation and densification during sintering have strong effects on the thermal conductivity of a porous ceramic body. This has been described by an analytical model using grain conductivity, grain size, pore fraction and particle – particle contact area as input parameters. It has been tested on hydroxyapatite ceramics sintered with conventional, microwave and spark plasma techniques. The green bodies containing at least 40% porosity yield conductivity values in the range 0.24–0.29 Wm−1K−1. Neck formation in the initial stage of sintering increases the values to above 0.5 Wm−1K−1. Further increase is achieved by densification, well described by Landauer's relation as part of the model with close agreement to experiment for hydroxyapatite ceramics containing 40 to 5% porosity. An evaluation of thermal conductivity for 100% dense hydroxyapatite gives a value of 1.5 Wm−1K−1 which is almost constant between room temperature and 900 °C. |
| first_indexed | 2024-04-10T04:15:08Z |
| format | Article |
| id | doaj.art-916b2fef44c74b55add4bf3483f0d966 |
| institution | Directory Open Access Journal |
| issn | 2666-5395 |
| language | English |
| last_indexed | 2024-04-10T04:15:08Z |
| publishDate | 2023-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Open Ceramics |
| spelling | doaj.art-916b2fef44c74b55add4bf3483f0d9662023-03-12T04:22:17ZengElsevierOpen Ceramics2666-53952023-03-0113100329Study of neck formation and densification in porous hydroxyapatite ceramics using thermal conductivity measurementsDavid S. Smith0Pierre Lefeuvre1Maxence Renaux2Benoit Nait-Ali3Anne Leriche4University of Limoges, Institute of Research for Ceramics (IRCER), UMR CNRS 7315, F-87068, Limoges, France; Corresponding author.Université Polytechnique Hauts-de-France, INSA Hauts-de-France, CERAMATHS - Laboratoire de Matériaux Céramiques et de Mathematiques, F-59313, Valenciennes, FranceUniversité Polytechnique Hauts-de-France, INSA Hauts-de-France, CERAMATHS - Laboratoire de Matériaux Céramiques et de Mathematiques, F-59313, Valenciennes, FranceUniversity of Limoges, Institute of Research for Ceramics (IRCER), UMR CNRS 7315, F-87068, Limoges, FranceUniversité Polytechnique Hauts-de-France, INSA Hauts-de-France, CERAMATHS - Laboratoire de Matériaux Céramiques et de Mathematiques, F-59313, Valenciennes, FranceNeck formation and densification during sintering have strong effects on the thermal conductivity of a porous ceramic body. This has been described by an analytical model using grain conductivity, grain size, pore fraction and particle – particle contact area as input parameters. It has been tested on hydroxyapatite ceramics sintered with conventional, microwave and spark plasma techniques. The green bodies containing at least 40% porosity yield conductivity values in the range 0.24–0.29 Wm−1K−1. Neck formation in the initial stage of sintering increases the values to above 0.5 Wm−1K−1. Further increase is achieved by densification, well described by Landauer's relation as part of the model with close agreement to experiment for hydroxyapatite ceramics containing 40 to 5% porosity. An evaluation of thermal conductivity for 100% dense hydroxyapatite gives a value of 1.5 Wm−1K−1 which is almost constant between room temperature and 900 °C.http://www.sciencedirect.com/science/article/pii/S2666539523000019Hydroxyapatite ceramicsGreen bodiesThermal conductivitySinteringNeck formation |
| spellingShingle | David S. Smith Pierre Lefeuvre Maxence Renaux Benoit Nait-Ali Anne Leriche Study of neck formation and densification in porous hydroxyapatite ceramics using thermal conductivity measurements Open Ceramics Hydroxyapatite ceramics Green bodies Thermal conductivity Sintering Neck formation |
| title | Study of neck formation and densification in porous hydroxyapatite ceramics using thermal conductivity measurements |
| title_full | Study of neck formation and densification in porous hydroxyapatite ceramics using thermal conductivity measurements |
| title_fullStr | Study of neck formation and densification in porous hydroxyapatite ceramics using thermal conductivity measurements |
| title_full_unstemmed | Study of neck formation and densification in porous hydroxyapatite ceramics using thermal conductivity measurements |
| title_short | Study of neck formation and densification in porous hydroxyapatite ceramics using thermal conductivity measurements |
| title_sort | study of neck formation and densification in porous hydroxyapatite ceramics using thermal conductivity measurements |
| topic | Hydroxyapatite ceramics Green bodies Thermal conductivity Sintering Neck formation |
| url | http://www.sciencedirect.com/science/article/pii/S2666539523000019 |
| work_keys_str_mv | AT davidssmith studyofneckformationanddensificationinporoushydroxyapatiteceramicsusingthermalconductivitymeasurements AT pierrelefeuvre studyofneckformationanddensificationinporoushydroxyapatiteceramicsusingthermalconductivitymeasurements AT maxencerenaux studyofneckformationanddensificationinporoushydroxyapatiteceramicsusingthermalconductivitymeasurements AT benoitnaitali studyofneckformationanddensificationinporoushydroxyapatiteceramicsusingthermalconductivitymeasurements AT anneleriche studyofneckformationanddensificationinporoushydroxyapatiteceramicsusingthermalconductivitymeasurements |