Dependence of the density of metal-powder compacts on compaction pressure

1968 ◽  
Vol 7 (8) ◽  
pp. 596-603
Author(s):  
L. A. Shofman
Keyword(s):  
Metal Powder ◽  
Compaction Pressure ◽  
Powder Compacts

Effects of Impurity Elements on Green Strength of Powder Compacts

2010 ◽  
Vol 654-656 ◽  
pp. 811-814 ◽  
Author(s):  
Ju Beom Lim ◽  
Colleen J. Bettles ◽  
Barry C. Muddle ◽  
Nho Kwang Park
Keyword(s):  
Surface Deformation ◽  
Surface Condition ◽  
Compaction Pressure ◽  
Bending Test ◽  
Solid Solution Strengthening ◽  
Green Strength ◽  
Metallic Compounds ◽  
Powder Particles ◽  
Indirect Tensile ◽  
Powder Compacts

The green strength of a powder compact results from the mechanical interlocking of the irregularities on the particle surfaces. During compaction, particle rearrangement, plastic deformation and particularly surface deformation of powders occur. Titanium powder is susceptible to interstitial element contamination, which may lead to solid solution strengthening of the particles and/or the formation of non-metallic compounds on the surface. However, the influence of these various impurities, namely oxygen and nitrogen, on the green strength has not been investigated. This work investigates and quantitatively evaluates the factors influencing the green strength of the powder compacts. The indirect tensile test was applied for the determination of the green strength of the powder compacts, and test results were compared to that of a more conventional 3-point bending test. The substantial dependence of green strength on both the amount of impurity element in the core of the powder particles and the compaction pressure is demonstrated. The effect of the surface condition of the powder particles on green strength is also reported.

FACTORS AFFECTING THE RADIAL AND AXIAL SHRINKAGE IN SOFT-METAL POWDER COMPACTS

1968 ◽  
Vol 11 (21) ◽  
pp. 63-72 ◽  
Author(s):  
I. A. EL-SHANSHOURY ◽  
M. Y. NAZMY
Keyword(s):  
Metal Powder ◽  
Factors Affecting ◽  
Soft Metal ◽  
Powder Compacts

Densification Behavior of Metal Powder Under Uniaxial Cold Compaction

2010 ◽  
Author(s):  
Mostafa Darroudi ◽  
Hojat Ghassemi ◽  
Mahmoud Akbari Baseri
Keyword(s):  
Finite Element ◽  
Metal Powder ◽  
Volume Fraction ◽  
Compaction Pressure ◽  
Solid Volume Fraction ◽  
Powder Compaction ◽  
Wall Friction ◽  
Isotropic Hardening ◽  
Spherical Powder ◽  
Von Mises

Metal powder compaction is a quite important process in Powder Metallurgy (PM) industry and it is widely applied in the manufacturing of key components in different fields. During metal powder compaction, the solid volume fraction changes and many mechanical characteristics become different. The Finite Element simulation provides a flexible and efficient approach for the researches of this process and its complicated mechanical behaviors. In this paper, several 2D finite element spherical powder compaction models are generated. Different particle arrangements are build up and different friction coefficients are set to the inter-particle contacts and die wall contact for a certain arrangement. The Von Mises yield surface with isotropic hardening plasticity model is applied in the simulation and the displacement controlled load is used to compress the structure up to 25% of die height. Results show that the die wall friction increases compaction pressure but inter-particle friction has negligible effect.

scholarly journals Density Distribution in Metal Powder Compacts

JOM ◽  
1956 ◽  
Vol 8 (2) ◽  
pp. 215-215 ◽  
Author(s):  
G. C. Kuczynski ◽  
I. Zaplatynskyj
Keyword(s):  
Density Distribution ◽  
Metal Powder ◽  
Powder Compacts
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