scholarly journals Particulate Scale Numerical Investigation on the Compaction of TiC-316L Composite Powders

2020 ◽  
Vol 2020 ◽  
pp. 1-13 ◽  
Author(s):  
Defeng Wang ◽  
Xizhong An ◽  
Peng Han ◽  
Haitao Fu ◽  
Xiaohong Yang ◽  
...  
Keyword(s):  
Relative Density ◽  
Numerical Investigation ◽  
Compaction Pressure ◽  
Green Compact ◽  
Densification Process ◽  
Compaction Process ◽  
Composite Powders ◽  
Packing Structure ◽  
Die Compaction ◽  
Initial Packing

This paper presents a numerical investigation on the 2D uniaxial die compaction of TiC-316L stainless steel (abbreviated by 316L) composite powders by the multiparticle finite element method (MPFEM). The effects of TiC-316L particle size ratios, TiC contents, and initial packing structures on the compaction process are systematically characterized and analyzed from macroscale and particulate scale. Numerical results show that different initial packing structures have significant impacts on the densification process of TiC-316L composite powders; a denser initial packing structure with the same composition can improve the compaction densification of TiC-316L composite powders. Smaller size ratio of 316L and TiC particles (R316L/RTiC = 1) will help achieve the green compact with higher relative density as the TiC content and compaction pressure are fixed. Meanwhile, increasing TiC content reduces the relative density of the green compact. In the dynamic compaction process, the void filling is mainly completed by particle rearrangement and plastic deformation of 316L particles. Furthermore, the contacted TiC particles will form the force chains impeding the densification process and cause the serious stress concentration within them. Increasing TiC content and R316L/RTiC can create larger stresses in the compact. The results provide valuable information for the formation of high-quality TiC-316L compacts in PM process.

scholarly journals Numerical Simulation of Densification of Cu–Al Mixed Metal Powder during Axial Compaction

Metals ◽  
2018 ◽  
Vol 8 (7) ◽  
pp. 537 ◽  
Author(s):  
Wenchao Wang ◽  
Hui Qi ◽  
Pingan Liu ◽  
Yuanbo Zhao ◽  
Hao Chang
Keyword(s):  
Numerical Simulation ◽  
Stress Distribution ◽  
Relative Density ◽  
Metal Powder ◽  
Dwell Time ◽  
Compaction Pressure ◽  
Diameter Ratio ◽  
Al Content ◽  
Die Compaction ◽  
Initial Packing

The densification mechanism of Cu–Al mixed metal powder during a double-action die compaction was investigated by numerical simulation. The finite element method and experiment were performed to compare the effect of the forming method, such as single-action die compaction and double-action die compaction, on the properties of compact. The results showed that the latter could significantly raise the densification rate and were in good agreement with Van Der Zwan–Siskens compaction equation. The effects of the different initial packing structures on the properties of the compact were studied. The results showed that a high-performance compact could be obtained using a dense initial packing structure at a given compaction pressure. Additionally, the effects of the Al content and compaction pressure on the relative density and stress distribution were analyzed. It was observed that, with an increase in the Al content at a given compaction pressure, the relative density of the compact increased, whereas the stress decreased. Furthermore, when the Al content was fixed, the relative density and stress increased with increasing compaction pressure. The relationship between the relative density and the compaction pressure under different friction conditions was characterized and fitted according to the Van Der Zwan–Siskens compaction equation. The influence mechanisms of die wall friction on the compaction behavior were investigated. It was revealed that friction is a key factor that causes the inhomogeneity of the powder flow and stress distribution. Finally, the effects of the dwell time and height–diameter ratio on the densification behavior were analyzed, and it was found that an increase in the dwell time promoted the densification process, whereas an increase of the height–diameter ratio could hinder the process.

scholarly journals FEM modeling on the compaction of Fe and Al composite powders

2015 ◽  
Vol 51 (2) ◽  
pp. 163-171 ◽  
Author(s):  
P. Han ◽  
X.Z. An ◽  
Y.X. Zhang ◽  
Z.S. Zou
Keyword(s):  
Relative Density ◽  
Flow Behavior ◽  
Compaction Pressure ◽  
Pressure Effects ◽  
Von Mises Stress ◽  
Composite Powders ◽  
Al Content ◽  
Ejection Force ◽  
Al Composite ◽  
The Relationship

The compaction process of Fe and Al composite powders subjected to single action die compaction was numerically modeled by FEM method. The relationship between the overall relative density and compaction pressure of the compacts with various Al contents was firstly identified, and the influences of Al content on the local relative density, stress, and their distributions were studied. Then the compaction pressure effects on the above properties with fixed Al content were discussed. Furthermore, detailed flow behaviors of the composite powders during compaction and the relationship between the compaction pressure and the ejection force/spring back of the compact were analyzed. The results show that: (1) With each compaction pressure, higher relative density can be realized with the increase of Al content and the relative density distribution tends to be uniform; (2) When the Al content is fixed, higher compaction pressure can lead to composite compact with higher relative density, and the equivalent Von Mises stress in the central part of the compact increases gradually; (3) Convective flow occurs at the top and bottom parts of the compact close to the die wall, each indicates a different flow behavior; (4) The larger the compaction pressure for each case, the higher the residual elasticity, and the larger the ejection force needed.

Mechanical Response of Porous Copper Manufactured by Lost Carbonate Sintering Process

2007 ◽  
Vol 539-543 ◽  
pp. 1863-1867 ◽  
Author(s):  
X.F. Tao ◽  
Li Ping Zhang ◽  
Y.Y. Zhao
Keyword(s):  
Particle Size ◽  
Flexural Strength ◽  
Relative Density ◽  
Mechanical Response ◽  
Compaction Pressure ◽  
Absorption Capacity ◽  
Energy Absorption Capacity ◽  
Three Point Bending ◽  
Porous Copper ◽  
The Impact

This paper investigated the mechanical response of porous copper manufactured by LCS under three-point bending and Charpy impact conditions. The effects of the compaction pressure and K2CO3 particle size used in producing the porous copper samples and the relative density of the samples were studied. The apparent modulus, flexural strength and energy absorption capacity in three-point bending tests increased exponentially with increasing relative density. The impact strength was not markedly sensitive to relative density and had values within 7 – 9 kJ/m2 for the relative densities in the range 0.17 – 0.31. The amount of energy absorbed by a porous copper sample in the impact test was much higher than that absorbed in the three-point bending test, impling that loading strain rate had a significant effect on the deformation mechanisms. Increasing compaction pressure and increasing K2CO3 particle size resulted in significant increases in the flexural strength and the bending energy absorption capacity, both owing to the reduced sintering defects.

Research on the Manufacture of some Tungsten-Copper Composite after Vacuum Sintering

2011 ◽  
Vol 672 ◽  
pp. 311-314
Author(s):  
Cristina Ileana Pascu ◽  
Alexandru Stanimir ◽  
Ioan Vida-Simiti
Keyword(s):  
Sintering Temperature ◽  
Tungsten Powder ◽  
Compaction Pressure ◽  
Great Power ◽  
Densification Process ◽  
Vacuum Sintering ◽  
Infiltration Temperature ◽  
High Tension ◽  
Copper Composite ◽  
Electrical Apparatus

The paper presents the results of the experimental research carried out in order to obtain pseudoalloys WNiCu used in electrical industry, for the electrical apparatus of high tension and great power. As a result it was compulsory to study the parameters that influence the densification process and the sintered properties, depending on the grain-size distribution of tungsten powder, compaction pressure and sintering temperature in vacuum. Therefore, it has been studied the influence of these parameters on the density, hardness and microstructures changes for the composites with 78%W-2%Ni-20%Cu, (% wt). The better results were obtained for the value of 1350 0C for the copper infiltration temperature.

Characteristics of FeCuAl Powder Compacts Formed through Uniaxial Die Compaction Route

2017 ◽  
Vol 264 ◽  
pp. 103-106 ◽  
Author(s):  
M.M. Rahman ◽  
M.A. Ismail ◽  
H. Y. Rahman
Keyword(s):  
Electrical Resistivity ◽  
Relative Density ◽  
Bending Strength ◽  
Axial Loading ◽  
Homogeneous Distribution ◽  
Volumetric Expansion ◽  
Different Temperatures ◽  
Die Compaction ◽  
Powder Compacts ◽  
Interconnected Pores

This paper presents the development of FeCuAl powder compacts through uniaxial die compaction process. Iron powder ASC 100.29 was mechanically mixed with other elemental powders, i.e., copper (Cu), and aluminum (Al) for 30 minutes at a rotation of 30 rpm. The feedstock was subsequently shaped at three different temperatures, i.e., 30°C, 150°C, and 200°C through simultaneous upward and downward axial loading of 325 MPa. The as-pressed samples termed as green compacts were then sintered in argon gas fired furnace at 800°C for three different holding times, i.e., 30, 60, and 90 min at a rate of 10°C/min. The sintered samples were characterized for their relative density, electrical resistivity, and bending strength. The microstructure of the sintered samples was also evaluated through scanning electron microscopy (SEM). The results revealed that the sample formed at 150°C and sintered for 30 min obtained the best final characteristics, i.e., higher relative density, lower volumetric expansion and electrical resistivity, and higher bending strength. Microstructure evaluation also revealed that the sample formed at 150°C and sintered for 30 min obtained more homogeneous distribution of grains and less interconnected pores compared to the other samples.

Effects of lubricant on green strength, compressibility and ejection of parts in die compaction process

2013 ◽  
Vol 233 ◽  
pp. 22-29 ◽  
Author(s):  
Ravi K. Enneti ◽  
Adam Lusin ◽  
Sumeet Kumar ◽  
Randall M. German ◽  
Sundar V. Atre
Keyword(s):  
Compaction Process ◽  
Green Strength ◽  
Die Compaction

Effect of Sintering Schedule to the Alloyability of FeCrAl Powder Mix Formed at above Ambient Temperature

2015 ◽  
Vol 1115 ◽  
pp. 199-202
Author(s):  
Mujibur M. Rahman ◽  
A.A.A. Talib
Keyword(s):  
Experimental Investigation ◽  
Elevated Temperature ◽  
Ambient Temperature ◽  
Axial Loading ◽  
Xrd Analysis ◽  
Compaction Process ◽  
Argon Gas ◽  
Fecral Alloy ◽  
Powder Mass ◽  
Die Compaction

This paper presents the outcomes of an experimental investigation on the effect of sintering schedule to the alloyability of FeCrAl powder mix formed through warm powder compaction process. A lab-scale uni-axial die compaction rig was designed and fabricated which enabled the compaction of powder mass at elevated temperature. Iron (Fe) powder ASC 100.29 was mechanically mixed with other alloying elements, namely chromium (Cr), and aluminum (Al) for 60 minutes and compacted at 150°C by applying 130 kN axial loading to generate green compacts. The defect-free green compacts were subsequently sintered in an argon gas fired furnace for different holding times. The sintered samples were then undergone XRD analysis. The results revealed that the alloyability of sintered products were affected by the holding time during sintering. The sample sintered at 800°C for 60 minutes showed the highest intensity of FeCrAl alloy.

DEVELOPMENT OF A HYBRID SOIL PRESSURE SENSOR AND ITS APPLICATION TO SOIL COMPACTION

2020 ◽  
Author(s):  
Mark Talesnick ◽  
Moti Ringel ◽  
Kyle Rollins
Keyword(s):  
Pressure Sensor ◽  
Soil Compaction ◽  
Compaction Pressure ◽  
Confining Pressure ◽  
Soil Pressure ◽  
Compaction Process ◽  
Vibratory Compaction ◽  
Soil Strain ◽  
The Relationship

A new soil pressure sensor based on a combination of the deflecting membrane and fluid filled approaches has been developed. The advantages of this combined approach are that issues of sensor compliance are eliminated without reducing the effectiveness of the sensor to be used for dynamic measurements. Calibration and verification testing performed under controlled laboratory conditions illustrate these benefits. The new system was implemented in a full-scale field trial which involved the construction of a compacted engineered fill 1.8 m in height. As each layer of fill was placed and compacted vertical in-soil pressure and vertical in-soil strain were continuously measured. During the vibratory compaction process both vertical soil pressure and vertical soil strain histories were captured in each layer. The data collected allowed for the determination of fill stiffness for both static and dynamic conditions. The results illustrate the effect of both confining pressure and strain level on fill stiffness. The relationship between compaction pressure and depth is clearly defined.

Cold Compaction of Composite Powders

1999 ◽  
Vol 122 (1) ◽  
pp. 119-128 ◽  
Author(s):  
K. T. Kim ◽  
J. H. Cho ◽  
J. S. Kim
Keyword(s):  
Experimental Data ◽  
Tungsten Powder ◽  
Cold Isostatic Pressing ◽  
Metal Powders ◽  
Composite Powders ◽  
Cold Compaction ◽  
Isostatic Pressing ◽  
Proposed Model ◽  
Theoretical Predictions ◽  
Die Compaction

Densification behavior of composite powders was investigated under cold compaction. Experimental data were obtained for mixed copper and tungsten powders with various volume fractions of tungsten powder under cold isostatic pressing and die compaction. A model was also proposed for densification of mixed—soft and hard—metal powders under cold compaction. Theoretical predictions from the proposed model and models in the literature were compared with experimental data. The agreements between experimental data and theoretical predictions from the proposed model are very good for composite powders at initial stage under cold isostatic pressing. Theoretical predictions, however, underestimate experimental data under cold die compaction. [S0094-4289(00)01901-0]

Densification of TiCN Matrix Cermets by Microwave Sintering

2011 ◽  
Vol 216 ◽  
pp. 579-582 ◽  
Author(s):  
Si Wen Tang ◽  
Hou An Zhang ◽  
Jian Hui Yan
Keyword(s):  
Relative Density ◽  
Sintering Temperature ◽  
Microwave Sintering ◽  
Protective Atmosphere ◽  
Densification Process ◽  
Sintering Time ◽  
Vacuum Microwave ◽  
Prepared Material ◽  
Higher Temperature ◽  
Reduce Energy Consumption

TiCN matrix cermets were prepared by using traditional sintering and microwave sintering. The effect of sintering methods, sintering temperature and protective atmosphere to the densification process of as prepared material were discussed. The results show that microwave sintering can short the sintering time than the traditional sintering, but it need higher temperature to obtain approximate density. At 1500°C,holding 5min, vacuum microwave sintering can gain relative density of 99.5%. The relative density of TiCN matrix cermets under argon shield is lower than vacuum microwave sintering, and the microscopic particles is more small, but the uniformity of pore is reduced. Microwave sintering can greatly reduce energy consumption.

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