Compressibility behaviour of conventional AlN-Cu mixtures and Cu-(AlN-Cu) composite powder mixtures
The compressibility of conventional Cu-AlN blends and blends prepared from composite powders (AlN-Cu) were investigated. The microstructural features of the precursor powders were related to the densification parameters obtained from compressibility models. The results of the linear equations of Hec...
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Published in | Powder technology Vol. 403; p. 117385 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
Lausanne
Elsevier B.V
01.05.2022
Elsevier BV |
Subjects | |
Online Access | Get full text |
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Summary: | The compressibility of conventional Cu-AlN blends and blends prepared from composite powders (AlN-Cu) were investigated. The microstructural features of the precursor powders were related to the densification parameters obtained from compressibility models. The results of the linear equations of Heckel, Panelli-Ambozio and Ge indicated that as the AlN fraction increased, the coefficient of plastic deformation decreased. At 10% and 20% by volume of AlN, the densification of the conventional Cu-AlN mixtures was higher than with coated particles, but at 30%, it was higher in the compacts with composite particles (AlN-Cu) due to the greater volume of coating involved in the plastic flow. Dilatometry studies revealed the positive effect of Cu coating in promoting the early start of sintering and promoting interfacial bonding of composite particles to the copper matrix.
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•The nodular finish of the coated powders (AlN-Cu) promotes adhesion during blending•Secondary rearrangement in compaction is decreased by the rough texture of (AlN-Cu)•The plastic deformation of the compact decreases with higher coating content•Linear compressibility models reveal significant resistance to plastic deformation•Cu-coating on ceramic surfaces accelerates the start of sintering |
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ISSN: | 0032-5910 1873-328X |
DOI: | 10.1016/j.powtec.2022.117385 |