Effect of additive content on the mechanical and thermal properties of pressureless liquid-phase sintered SiC
Pressureless liquid-phase sintered SiC (LPS-SiC) ceramics fabricated from β-SiC and 1 vol% α-SiC seeds with 3–15 vol% Al2O3-Y2O3-CaO additives were prepared to investigate the effects of additive content on the mechanical and thermal properties. All the specimens consisted primarily of elongated α-S...
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| Format: | Article |
| Language: | English |
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Taylor & Francis Group
2020-04-01
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| Series: | Journal of Asian Ceramic Societies |
| Subjects: | |
| Online Access: | http://dx.doi.org/10.1080/21870764.2020.1749376 |
| _version_ | 1818595905597603840 |
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| author | Rohit Malik Yong-Hyeon Kim Young-Wook Kim |
| author_facet | Rohit Malik Yong-Hyeon Kim Young-Wook Kim |
| author_sort | Rohit Malik |
| collection | DOAJ |
| description | Pressureless liquid-phase sintered SiC (LPS-SiC) ceramics fabricated from β-SiC and 1 vol% α-SiC seeds with 3–15 vol% Al2O3-Y2O3-CaO additives were prepared to investigate the effects of additive content on the mechanical and thermal properties. All the specimens consisted primarily of elongated α-SiC grains that were predominantly formed via β to α phase transformation and via the growth of the initially added α-SiC seeds during the sintering. The grain growth and polytypic transformation exhibited diffusion-controlled kinetics. The highest value for fracture toughness (5.4 MPa·m1/2) was exhibited at an additive content level of 7 vol%; this was attributable to the optimal interfacial strength and well-interlocked elongated grains with active crack–microstructure interaction. The specimen with 7 vol% additive content exhibited the highest flexural strength (686 MPa) among the reported pressureless LPS-SiC ceramics, and this was attributable to its high density and the optimal content of soft intergranular phase (IGP). The hardness and thermal conductivity decreased gradually with the increase in additive content, owing to the increased volume fraction of the soft IGP with low thermal conductivity. |
| first_indexed | 2024-12-16T11:23:27Z |
| format | Article |
| id | doaj.art-2d456591747c4f559307f40f3fe8c120 |
| institution | Directory Open Access Journal |
| issn | 2187-0764 |
| language | English |
| last_indexed | 2024-12-16T11:23:27Z |
| publishDate | 2020-04-01 |
| publisher | Taylor & Francis Group |
| record_format | Article |
| series | Journal of Asian Ceramic Societies |
| spelling | doaj.art-2d456591747c4f559307f40f3fe8c1202022-12-21T22:33:25ZengTaylor & Francis GroupJournal of Asian Ceramic Societies2187-07642020-04-018244845910.1080/21870764.2020.17493761749376Effect of additive content on the mechanical and thermal properties of pressureless liquid-phase sintered SiCRohit Malik0Yong-Hyeon Kim1Young-Wook Kim2The University of SeoulThe University of SeoulThe University of SeoulPressureless liquid-phase sintered SiC (LPS-SiC) ceramics fabricated from β-SiC and 1 vol% α-SiC seeds with 3–15 vol% Al2O3-Y2O3-CaO additives were prepared to investigate the effects of additive content on the mechanical and thermal properties. All the specimens consisted primarily of elongated α-SiC grains that were predominantly formed via β to α phase transformation and via the growth of the initially added α-SiC seeds during the sintering. The grain growth and polytypic transformation exhibited diffusion-controlled kinetics. The highest value for fracture toughness (5.4 MPa·m1/2) was exhibited at an additive content level of 7 vol%; this was attributable to the optimal interfacial strength and well-interlocked elongated grains with active crack–microstructure interaction. The specimen with 7 vol% additive content exhibited the highest flexural strength (686 MPa) among the reported pressureless LPS-SiC ceramics, and this was attributable to its high density and the optimal content of soft intergranular phase (IGP). The hardness and thermal conductivity decreased gradually with the increase in additive content, owing to the increased volume fraction of the soft IGP with low thermal conductivity.http://dx.doi.org/10.1080/21870764.2020.1749376sicpressureless sinteringmechanical propertiesthermal conductivityadditive content |
| spellingShingle | Rohit Malik Yong-Hyeon Kim Young-Wook Kim Effect of additive content on the mechanical and thermal properties of pressureless liquid-phase sintered SiC Journal of Asian Ceramic Societies sic pressureless sintering mechanical properties thermal conductivity additive content |
| title | Effect of additive content on the mechanical and thermal properties of pressureless liquid-phase sintered SiC |
| title_full | Effect of additive content on the mechanical and thermal properties of pressureless liquid-phase sintered SiC |
| title_fullStr | Effect of additive content on the mechanical and thermal properties of pressureless liquid-phase sintered SiC |
| title_full_unstemmed | Effect of additive content on the mechanical and thermal properties of pressureless liquid-phase sintered SiC |
| title_short | Effect of additive content on the mechanical and thermal properties of pressureless liquid-phase sintered SiC |
| title_sort | effect of additive content on the mechanical and thermal properties of pressureless liquid phase sintered sic |
| topic | sic pressureless sintering mechanical properties thermal conductivity additive content |
| url | http://dx.doi.org/10.1080/21870764.2020.1749376 |
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