Analysis of Density of Sintered Iron Powder Component Using the Response Surface Method

Abstract

The continued growth of ferrous powder metallurgy in automobile and others engineering application is largely de-pendent on the development of higher density materials and improved mechanical properties. Since density is a predominant factor in the performance of powder metallurgy components, it has been primarily considered for the present investigation. An experimental investigation have been undertaken in order to understand the variation of density with respect to the variation of process parameters viz., compaction load, sinter temperature and sintering time. The relation among the various process parameters with density has been observed. A mathematical model has been developed using second order response surface model (RSM) with central composite design (CCD) considering the above mentioned process parameters. The developed mathematical model would help in predicting the variation in density with the change in the level of different parameters influencing the density variation. This model also can be useful for setting of optimum value of the parameters for achieving the target density

Medium-Frequency Electrical Resistance Sintering of Soft Magnetic Powder Metallurgy Iron Parts

“…Three 3.5 g-12 mm diameter compacts were conventionally consolidated, i.e., cold compacted at 500 MPa (die wall lubrication) and vacuum furnace sintered at 1175 • C for 30 min. The final porosity of these compacts was about 0.15 ± 0.01, an adequate value to be compared with the MF-ERS compacts (porosities under 0.08-0.09 can be reached with conventional processing by using reducing atmospheres with specially designed Fe powder [20,21]). As happening with the electrically consolidated compacts, two series were prepared to measure different properties because of the need of cutting the specimens.…”

Medium-Frequency Electrical Resistance Sintering of Oxidized C.P. Iron Powder

“…With the best result, the final porosity of the compacts could not be below 15%. Although lower porosities of about 8-9% or less can be reached with certain Fe powders and the use of reducing atmospheres during particular press and sinter cycles [12,13], it is interesting for comparison purposes not to use reducing atmospheres, since the MF-ERS experiments were carried out with different current intensities and heating times. Tested intensities were 6, 8, and 10 kA, and heating times of 400, 700, and 1000 ms were chosen.…”

Medium-frequency Electrical Resistance Sintering of Oxidized c.p. Iron Powder

“…With the best result, the final porosity of the compacts could not be below 15 %. Although lower porosities of about 8-9 % or less can be reached with certain Fe powders and the use of reducing atmospheres during particular press and sinter cycles [12,13], it is interesting for comparison purposes not to use reducing atmospheres, since the MF-ERS process is carried out in air, without reducing atmosphere.…”