“…An improvement of the strength of such a composite is also possible when using a fine powder of boron carbide which would effectively fill the space between the densely packed particles of the matrix alloy. The powder compressibility characterization has been performed by plotting the compaction curves ρ(P) obtained for the conditions of uniaxial quasi-static pressing with loading-reloading cycles and using an approximation by a logarithmic equation in a dimensionless form [7,8]: (2) where ρ is the relative density of the green body; P is the applied compaction pressure; P cr is the critical pressure (pressure enabling compaction up to full density of the powder material); b is a material constant defining densification pressure sensitivity. Due to the limitations on the values of the relative density ( 01 ), equation (2) is valid for a limited range of the values of the applied pressure:…”
Section: Optimization Of Powder Mixturesmentioning
Abstract. The modeling (and its experimental verification) of packing and deformation of the composites consisted of aluminum-magnesium alloy AMg6, B 4 C powder and W nano-powder has been performed. The powder compositions were determined using discrete element modeling of the composite particles packing based on the particle size distribution functions of real powders. The models of maximum mixture packing densities have been rendered.
“…An improvement of the strength of such a composite is also possible when using a fine powder of boron carbide which would effectively fill the space between the densely packed particles of the matrix alloy. The powder compressibility characterization has been performed by plotting the compaction curves ρ(P) obtained for the conditions of uniaxial quasi-static pressing with loading-reloading cycles and using an approximation by a logarithmic equation in a dimensionless form [7,8]: (2) where ρ is the relative density of the green body; P is the applied compaction pressure; P cr is the critical pressure (pressure enabling compaction up to full density of the powder material); b is a material constant defining densification pressure sensitivity. Due to the limitations on the values of the relative density ( 01 ), equation (2) is valid for a limited range of the values of the applied pressure:…”
Section: Optimization Of Powder Mixturesmentioning
Abstract. The modeling (and its experimental verification) of packing and deformation of the composites consisted of aluminum-magnesium alloy AMg6, B 4 C powder and W nano-powder has been performed. The powder compositions were determined using discrete element modeling of the composite particles packing based on the particle size distribution functions of real powders. The models of maximum mixture packing densities have been rendered.
“…Several mechanisms have been proposed for the densification or compaction of ceramic powders [24,25]. Some of the characteristics of ceramic powder compaction could be applied to the process of MC.…”
“…[15] and ceramic powders, e.g. [16,17]. It is pertinent to briefly consider here some features of ceramic powder compaction by using, for instance, a die and punch assembly.…”
Section: Densification Of the Particle Layermentioning
confidence: 99%
“…It should be noted that the van der Waals forces are undesirable in most fine powder die compaction processes because they significantly retard the mutual rearrangement of particles. This is, along with the above-mentioned effect of die-wall friction, another reason why densification of nanosized powders requires enormous pressures [16]. Similarly, in the UMCA coating process, attractive forces between TiN nanoparticles can impede their ability to rearrange.…”
Section: Consolidation Of Nanoparticlesmentioning
confidence: 99%
“…Therefore, in order to describe the compaction process quantitatively, we adopted the equation of Khasanov et al [16], which was verified experimentally for a die compaction of ceramic nanopowders. The equation reveals that the relative density of a compact, ρ, is dependent on the compaction pressure, P c as follows:…”
Section: Ball Impact On Precoated Surfacementioning
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