Consolidation behaviour of Cu/AlN composites by pulse electric current sintering of copper-coated aluminium nitride precursors
| Autor: | D. Ramírez-Vinasco, E.A. Aguilar-Reyes, Makoto Nanko, C.A. León-Patiño |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Aluminium nitride General Chemical Engineering Composite number Direct current Sintering chemistry.chemical_element 02 engineering and technology engineering.material 021001 nanoscience & nanotechnology Copper chemistry.chemical_compound 020401 chemical engineering chemistry Coating visual_art visual_art.visual_art_medium engineering Relative density Ceramic 0204 chemical engineering Composite material 0210 nano-technology |
| Zdroj: | Powder Technology. 377:723-732 |
| ISSN: | 0032-5910 |
| Popis: | The effect of densification rate on hot consolidation behaviour by pulse electric current sintering (PECS) of AlN-Cu core-shell composite powders (≈13 vol% Cu) is investigated. The ceramic phase was limited to 10, 20 and 30 vol% AlN by adding electrolytic copper particles. The Cu-coating on the ceramic surfaces served as a bridge for the passage of direct current to and between the copper particles of the matrix, making its conversion into heat more efficient. A constant pressure of 50 MPa was applied at the maximum of 850 °C. Three stages of displacement under load were observed, corresponding to particle rearrangement, localized deformation and deformation of the bulk. Thermal softening of the coating promoted a rapid surface-diffusion sintering and neck growth with the copper matrix, reaching a relative density above 97%. The Cu-coated particles led to a more homogeneous interconnected matrix microstructure and isolated the direct-contact between the ceramic particles. |
| Databáze: | OpenAIRE |
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