Porous Steel
Fabrication and Mechanical Properties
** outline**
Porous metals
Fabrication method
Mechanical properties
Future research
** Applications of Porous Metals **
Heat exchangers
Diesel particulate filters
Gas and liquid filters
Sound absorbers
Energy absorbers
Capillary pumping systems
** Existing Methods for Making Porous Metals **
Porous metals are currently produced using a range of techniques:
Melt-gas injection
Powder foaming
Melt infiltration
Investment casting
Metal deposition
Sintering hollow metal spheres
** Lost Carbonate Sintering (LCS) process for manufacturing porous metals **
Mixing steel + carbonate powders
Moisturising with ethanol
Cold pressing
Sintering at 850℃ for 4 hrs
Dissolving carbonate in water or decomposing carbonate at high temperatures
Drying
** Characteristics of LCS **
Suitable for metals with high melting points.
Open cells
Controllable pore size and shape
Controllable density and porosity
Low cost
** Process Conditions **
Percentage of Steel Powder (%)
25, 30, 35, 40, 45
Carbonate Particle Size (μm)
<250, 250~410, 410~710, 710~1000,1000~1500
Compacting Pressure (MPa)
100, 150, 200, 250, 300.
Sintering Time is 4 hours at 850℃ for normal melting and 4hours at 850℃ plus 0.5hour at 950℃ for decomposing.
** Investigation of Mechanical Properties **
Rockwell Test
Compressive Test
Tensile Test
Three Point Bending Test
** Rockwell Test **
** Compressive Tests **
Porous steel
Porous steel with pipe (sintered together)
Mild steel pipe only
Porous steel with mild steel pipe
** Stress and Strain Static Compression **
** Three Point Bending Test **
Sintered solid steel
Porous steel only
Porous Steel with Two Steel Sheets
** Comparing sandwich porous steel with solid steel sintered by powder **
** Three Point Bending Test **
Fe 25% -- 45% K2CO3 710~1000 With Two Steel Sheets
** Future Research Areas **
Effect of compact pressure on mechanical properties
Investigate impact properties
Improvement for sintering process
** Thank You **
Supervisor：
Dr. Yuyuan Zhao
Dr. G Schleyer