Stainless steel foams made through powder metallurgy route using NH4HCO3 as space holder

2015 ◽  
Vol 88 ◽  
pp. 430-437 ◽  
Author(s):  
D.P. Mondal ◽  
Hemant Jain ◽  
S. Das ◽  
A.K. Jha
Keyword(s):  
Stainless Steel ◽  
Powder Metallurgy ◽  
Space Holder ◽  
Powder Metallurgy Route

scholarly journals Comparative analysis of characteristics of stainless steel cellular material prepared through powder metallurgy using accicular and crushed urea as spaceholder

2019 ◽  
Vol 16 (2) ◽  
pp. 183-188
Author(s):  
Shailendra Joshi
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Powder Metallurgy ◽  
High Strength ◽  
Metallic Foam ◽  
Space Holder ◽  
Excellent Mechanical Property ◽  
Circular Holes ◽  
Steel Foam ◽  
Damping Capability

Stainless steel has an excellent mechanical property as well as high corrosion resistance. Stainless steel foams, therefore, seemed like an attractive material for impact energy absorption applications where damping capability is required such as in vehicles and buildings. Also when stainless steel foam is produced as stainless steel foam, the material density will be reduced thus the resulting foam will be a combination of light weight and high strength that can also be used in high strength applications. In our analysis, we tried to produce stainless steel foam through powder metallurgy in order to control mechanical properties in a better manner compared to the casting method. Also, we try to compare the pore morphology in foams on changing the space holder from accicular urea to crushed urea using FE-SEM. The properties of stainless steel foam, to a large extent, are found to depend on the arrangement of the pores which is decided by the space holder utilized during its synthesis using powder metallurgy route. The stainless steel obtained using acicular carbamide as space holder is found to possess acicular or irregular pores whereas those produced with crushed urea as space holder possesses nearly circular holes. Also, the previous foams are found to have better mechanical properties contributing towards more useful metallic foam.

Porous Copper Fabricated through Powder Metallurgy Route Using NaCl Space Holder

2013 ◽  
Vol 446-447 ◽  
pp. 335-338 ◽  
Author(s):  
Nor Amalina Nordin ◽  
Muhammad Hussain Ismail ◽  
Nik Muhammad Faiz Nik Jafar
Keyword(s):  
Sodium Chloride ◽  
Powder Metallurgy ◽  
Volume Fraction ◽  
Water Leaching ◽  
Space Holder ◽  
Dimensional Changes ◽  
Porous Copper ◽  
Hot Compaction ◽  
Feedstock Material ◽  
Powder Metallurgy Route

Porous Copper (porous Cu) with varying porosities was prepared using sodium chloride (NaCl) particles as space holder through powder metallurgy route. Pre-alloyed copper that was used as a feedstock material were mixed with the varying proportion (0%, 20%, 40% and 60% of volume fraction) of laboratory grade NaCl prior to hot compaction. The green compacts were subjected to water leaching process in order to remove NaCl particles and consequently being sintered at 850°C. The resultant porous Cu were examined in terms of density, porosities, microstructures and dimensional changes. The effect of space holder on the occurrence of pores in sintered article was investigated. It was found that the amount and shape of the space holder particle greatly affect the percentage of porosities and the shape of the pore of the sintered article.

The Effect of Different Composition of Stainless Steel (SS316L) Foam via Space Holder Method

2016 ◽  
Vol 1133 ◽  
pp. 310-313 ◽  
Author(s):  
Murni Faridah Mahammad Rafter ◽  
Sufizar Ahmad ◽  
Rosdi Ibrahim
Keyword(s):  
Stainless Steel ◽  
Powder Metallurgy ◽  
Sintering Process ◽  
Wear Performance ◽  
Space Holder ◽  
Powder Metallurgy Process ◽  
Lower Porosity ◽  
Steel Foam ◽  
Cold Pressed ◽  
Metallurgy Process

Stainless Steel materials (SS316L) generally known as a highly wear performance and resistant to corrosion. The purpose in this study is to produce the stainless steel foam and physical properties of sintered 316L stainless steel materials produced by powder metallurgy (P/M) method. In this paper, the method is based on using spherical urea as space holder was investigated. Then, the foams will be given to consider the properties of SS316L foam after sintering process. Powder metallurgy process needs to go through the mixing, pressing, sintering and analysis. The selected compositions of SS316L were varied from 50 wt % to 60 wt % SS316L, respectively while the remaining percentages are foaming agent. The SS316L powders were cold-pressed with 8 tons pressure and sintered at 1200°C via tube furnace. The SS316L foams were then characterised using Scanning Electron Microscopy (SEM) for morphological characterisation of the samples after sintering process. Lastly, porosity and density were tested for this sample. As a result, the composition with 60 wt % SS316L is provided higher bulk density and lower porosity which are 4.34 g/cm3 and 69.03 %, respectively.

Highly porous open cell Ti-foam using NaCl as temporary space holder through powder metallurgy route

2013 ◽  
Vol 47 ◽  
pp. 810-819 ◽  
Author(s):  
Nidhi Jha ◽  
D.P. Mondal ◽  
J. Dutta Majumdar ◽  
Anshul Badkul ◽  
A.K. Jha ◽  
...  
Keyword(s):  
Powder Metallurgy ◽  
Open Cell ◽  
Space Holder ◽  
Highly Porous ◽  
Powder Metallurgy Route

scholarly journals Production of Porous Stainless Steel using the Space Holder Method

2021 ◽  
Vol 50 (2) ◽  
pp. 507-514
Author(s):  
Koon Tatt Tan ◽  
Norhamidi Muhamad ◽  
Andanastuti Muchtar ◽  
Abu Bakar Sulong ◽  
Yih Shia Kok
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Elastic Modulus ◽  
Powder Metallurgy ◽  
Yield Strength ◽  
Sintering Temperature ◽  
Volumetric Shrinkage ◽  
Metallic Foams ◽  
Space Holder ◽  
Porous Stainless Steel

Metallic foams and porous materials can be produced by various methods. Among the methods that can produce metallic foams and porous materials, powder metallurgy is a promising method. This study investigates the production of a porous stainless steel by the space holder method in powder metallurgy. A novel space holder i.e. glycine and binder consisting of polymethylmethacrylate and stearic acid are used. Different amounts of glycine are added to the mixture of stainless-steel powder and binder. Subsequently, each mixture is cold-pressed at a pressure of 9-ton m-2. The samples are sintered at 1050 and 1150 °C with holding times of 30, 60, and 90 min. The microstructures and physical and mechanical properties of the sintered samples are investigated. A porous stainless steel with porosity ranging from 30.8 to 51.4% is successfully fabricated. Results show that the glycine content and sintering parameters influence the properties of the porous stainless steel. The sintering temperature significantly affects volumetric shrinkage. Volumetric shrinkage decreases as the volume fraction of glycine increases to 30% whereas sintering temperature 1150 °C and holding time 90 min will increase the volumetric shrinkage. The compressive yield strength and corresponding elastic modulus are in the ranges of 22.9 to 57.6 MPa and 6.3 to 26.8 GPa, respectively. The samples produced have potential biomedical applications because their mechanical properties, yield strength and elastic modulus match those of human bones.

Titanium foam through powder metallurgy route using acicular urea particles as space holder

2011 ◽  
Vol 65 (21-22) ◽  
pp. 3199-3201 ◽  
Author(s):  
M. Sharma ◽  
G.K. Gupta ◽  
O.P. Modi ◽  
B.K. Prasad ◽  
Anil K. Gupta
Keyword(s):  
Powder Metallurgy ◽  
Space Holder ◽  
Titanium Foam ◽  
Powder Metallurgy Route
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