Journal ArticleDOI
Relationship between compacting pressure, green density, and green strength of copper powder compacts
In-Hyung Moon,Kyung-Hyup Kim +1 more
TLDR
In this paper, the dependence of green strength on green density and on compacting pressure was investigated for the bidirectional die pressed and isostatically pressed Cu powder compacts, and the green strength seemed to be directly proportional to the contact area between powder particles.Abstract:
The dependence of green strength on green density and on compacting pressure was investigated for the bidirectional die pressed and isostatically pressed Cu powder compacts. The breaking strength of the pressed Cu compact was found to increase with green density and also with compacting pressure. The green strength seemed to be directly proportional to the contact area between powder particles. A theoretical equation for the relationship between green density and contact area was derived from a geometrical consideration, and agreed well with experimental findings. PM/0272read more
Citations
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Journal ArticleDOI
Cold compaction of iron powders—relations between powder morphology and mechanical properties: Part I: Powder preparation and compaction
TL;DR: In this article, the effect of morphology of iron powders on their compaction behavior has been studied in the case of compacts with a final relative density below 0.8, and two powders, one with spherical grains and the other with spongy grains, have been synthetized in order to prepare green compacts under pressures ranging from 100 to 350 MPa.
Journal ArticleDOI
Deformation characterization of powdered metals in compaction
Beong-Bok Hwang,Shiro Kobayashi +1 more
TL;DR: In this article, a plasticity theory for a powdered metal compact is developed for describing asymmetric behavior of powdered metal compacts in tension and in compression, and three parameters α, δ, and p are involved in the yield function: α and δ are determined from the behavior of sintered powdered compacts as functions of relative density R.
Journal ArticleDOI
Cold compaction of iron powders: relations between powder morphology and mechanical properties. Part II. Bending tests: results and analysis
TL;DR: In this article, the authors determined the green strength of compacts made from iron powders and understand how it correlates with pressure compaction and powder morphology, showing that compacts composed of spongy-like particles have better green strength than those made of spherical particles, but the global load/displacement response of the TPB tests cannot be explained by a symmetric behavior in tension and in compression of the tested materials.
Journal ArticleDOI
Latest Developments in Modeling and Characterization of Joining Metal Based Hybrid Materials
TL;DR: Khoddam et al. as mentioned in this paper reviewed the theoretical and experimental studies of the interface inside several metal-based composites, including interface bonding's critical parameters, characterization techniques of joining processes, potential applications, and their future perspectives.
Relationship between particle size and manufacturing processing and sintered characteristics of iron powders
TL;DR: In this paper, the effect of particle size distribution on physical properties of powder mixtures, of green compacts and of sintered samples has been studied, and the results show that an appropriate selectionof average particle size for the preparation of the powder mixture is useful in order to obtain samples with suitable physical properties.
References
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Journal ArticleDOI
Surface energy and adhesion at metal contacts
K.E Easterling,A.R Thölén +1 more
TL;DR: In this paper, the surface energy of particles can be estimated directly from the lateral spread of the fringes (as measured on the micrographs) and knowledge of the elastic modulus of the metal, and small changes induced in the contact geometry between the metal surfaces (e.g., due to plastic deformation) can substantially increase the adhesion at the junction.
Journal ArticleDOI
The role of surface energy and powder geometry in powder compaction
K. E. Easterling,A. R. Thölén +1 more
TL;DR: In this paper, the authors investigated the factors governing the strength of cold-pressed metal powder compacts and concluded that the most important parameters are freedom from oxidation and the plastic properties of the powder particles.
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K. E. Easterling,A. R. Thölén +1 more