Compaction of Ceramic Microspheres, Spherical Molybdenum Powder and Other Materials to 3 GPa

Carlson, S R; Bonner, B.P.; Ryerson, Frederick J.; Hart, M M

doi:10.2172/899097

Cited by 2 publications

(10 citation statements)

References 8 publications

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“…The bulk and grain densities yield a porosity of about 80%. This value is somewhat smaller than the 88% porosity obtained by Carlson et al (2005) for another (different) epoxy foam. A portion of foam was manually ground into a fine powder and a single specimen was prepared.…”

Section: Materials Descriptionscontrasting

confidence: 61%

“…Equation (1), due to Kawakita and Ludde (1970), was found to provide an excellent fit between relative volume compaction, C, and pressure, P, for several granular materials (Carlson et al, 2005).…”

Section: Kawakita Modelmentioning

confidence: 97%

“…Three Expancel microsphere specimens were prepared in the same manner as the solid medium test specimens described in Carlson et al (2005). The jacketed specimens are 12.7 mm in outer diameter and 30.2 mm in length.…”

Section: Specimen Preparationmentioning

confidence: 99%

“…Nickel Standard #1 (Carlson et al, 2005) was chosen as the reference standard. The nickel standard was compressed to 3 GPa in two separate tests.…”

Section: Friction Correctionsmentioning

confidence: 99%

“…The experimental techniques and data reduction procedures are similar to those employed in earlier studies at LLNL on fractured rocks and other earth materials (Stephens and Lilley, 1966), alluvium (Heard and Stephens, 1970), powders (Weed, 1984) and, more recently, ceramic microspheres and spherical molybdenum powder (Carlson et al 2005). …”

Section: Introductionmentioning

confidence: 99%

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Compaction of Expancel Microspheres and Epoxy Foam to 3 GPa

Carlson¹,

Bonner²,

Ryerson³

et al. 2006

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Section: Materials Descriptionscontrasting

confidence: 61%

Section: Kawakita Modelmentioning

confidence: 97%

Section: Specimen Preparationmentioning

confidence: 99%

“…Nickel Standard #1 (Carlson et al, 2005) was chosen as the reference standard. The nickel standard was compressed to 3 GPa in two separate tests.…”

Section: Friction Correctionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Compaction of Expancel Microspheres and Epoxy Foam to 3 GPa

Carlson¹,

Bonner²,

Ryerson³

et al. 2006

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Comprehensive finite-element study of processes for the production of titanium strips by asymmetric cold rolling of a powder followed by sintering

Prykhodko¹,

Dedik²,

Brandt³

et al. 2019

Fund.Appl.Probl.F.Met

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Finite-element numerical modeling was implemented and a study of the production processes of thin titanium strips was carried out on the basis of two key sequential processes: asymmetric powder rolling and sintering of the rolled product using the Brand-Nielson model. The results of studying the processes of compaction and sintering of titanium powder using a single mathematical model proposed by Jan Brandt are presented. For the calculations we used experimentally determined shear stresses and volumetric compression modulus under hydrostatic compression and uniaxial compression. The friction conditions between the surfaces of the rolls and the powder were determined as a function of the change in the Coulomb coefficient of friction on the relative sliding speed of the surfaces of the roll and the workpiece. An analysis of the results allows a quantitative assessment of the influence of the technology parameters of the compaction and sintering processes on the change in the stress state and relative density in the volume of products at the stages of production processes. It is shown that the application of the von Mises density and stress diagrams for the correction of the sintering regime allows avoiding the appearance of defects (insufficiently uniform density of the sintered material and the presence of microcracks) during intense heating of the metal in the furnace. The development of sintering modes based on the Brand-Nielson model simplifies the improvement of technology in the sintering of bulk bodies, which is a more time-consuming process than sintering of thin plates. This model can be used in the development of sintering regimes for various materials since it takes into account the influence of basic phenomena in this process. By varying the technology parameters it is possible to achieve targeted effects on product quality indicators and prevent the formation of microcracks in them.

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Compaction of Ceramic Microspheres, Spherical Molybdenum Powder and Other Materials to 3 GPa

Cited by 2 publications

References 8 publications

Compaction of Expancel Microspheres and Epoxy Foam to 3 GPa

Compaction of Expancel Microspheres and Epoxy Foam to 3 GPa

Comprehensive finite-element study of processes for the production of titanium strips by asymmetric cold rolling of a powder followed by sintering

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