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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Bibliographic Details
Published inPowder technology Vol. 403; p. 117385
Main Authors Ramírez-Vinasco, D., León-Patiño, C.A., Aguilar-Reyes, E.A., Rodríguez-Ortiz, G.
Format Journal Article
LanguageEnglish
Published Lausanne Elsevier B.V 01.05.2022
Elsevier BV
Subjects
Coated particles
Coating effects
Coatings
Compacts
Composite powder
Compressibility
Compressibility (powder)
Copper
Copper coating
Cu/AlN composite
Densification
Densification behaviour
Dilatometry
Linear equations
Metal matrix composite
Mixtures
Particulate composites
Plastic deformation
Plastic flow
Sintering (powder metallurgy)
Densification behaviour
Compressibility
Cu/AlN composite
Composite powder
Metal matrix composite
Copper coating
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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. [Display omitted] •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
ISSN:0032-5910
1873-328X
DOI:10.1016/j.powtec.2022.117385