Effect of pressing process parameters on the thermal conductivity of cold-pressed porous powder composites

Gruzdev, V. A.; Zarichnyak, Yu. P.; Kovalenko, Yu. A.

doi:10.1007/bf00794789

Cited by 5 publications

(4 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The MnAl powder compacts used in our experiments are coldpressed powder materials. Therefore, in keeping with Gruzdev's findings [12], the large discrepancy observed in our study is not surprising.…”

Section: Resultssupporting

confidence: 87%

“…Depending on the method of manufacture of the powders, the individual powder is in a stressed condition with a large number of defects, which lowers its thermal conduc tivity. A similar observation existed in the investigation by Gruzdev et al [12]. With the aim of developing a method to predict the thermal conductivity of coldpressed porous powder materials (CPPMs), the following conclusions were reached.…”

Section: Resultsmentioning

confidence: 56%

See 1 more Smart Citation

Determination of Thermal Conductivity of Mn-Al Powder Compacts using An Inverse Heat Transfer Procedure

Argyropoulos²

2012

High Temperature Materials and Processes

View full text Add to dashboard Cite

The effective thermal conductivities of various MnAl powder compact compositions were measured using an Inverse Heat Transfer Procedure, and extensive validation work was also carried out. Specially fabricated cylindrical compact specimens were used equipped with two thermocouples at strategic locations. The porosity of these specimens was also measured.The estimated effective thermal conductivities of various MnAl compacts were in the range of 5.5 to 10.5 W m −1 °C −1 , which are much lower than that of Al (237 W m −1 °C −1 ), and close to that of Mn (7.8 W m −1 °C −1 ). The effective thermal conductivities of MnAl powder com pacts decreased with an increase in the compact's Mn composition and porosity. Within the examined tempera ture range of 250 to 600 °C, the effect of temperature on the effective thermal conductivity was minimal. A purely theoretically derived prediction of MnAl compact thermal conductivity is substantially higher than the estimates of using the IHTP.

show abstract

Section: Resultssupporting

confidence: 87%

Section: Resultsmentioning

confidence: 56%

Determination of Thermal Conductivity of Mn-Al Powder Compacts using An Inverse Heat Transfer Procedure

Argyropoulos²

2012

High Temperature Materials and Processes

View full text Add to dashboard Cite

show abstract

“…This is actually not a surprising conclusion. The plastic behaviour of materials constituting the particles of very fine powders does not necessarily have to be identical to that of the bulk materials, despite having the same composition [36]. Depending on the powder manufacturing method, and its thermal and mechanical history as compared to that of tested bulk materials, the material of a particle is in a stressed (quenched) or relaxed condition that could affect its plasticity.…”

Section: Discussionmentioning

confidence: 99%

On the compressibility of metal powders

et al. 2018

View full text Add to dashboard Cite

A new equation relating the porosity of green compacts and the applied external pressure during the cold die compaction of metal powders is proposed. All of the parameters in the model have a clear physical meaning. These parameters are those related to the plastic behaviour of the material, as well as to the 'structural resistance' of the powder mass. Also the friction between the powders and die walls is considered, as a kind of constraint that diminishes the local pressure borne by the fully dense material. The model includes, as a key parameter, the tap porosity of the powders (an extremely useful property that contains the morphometric information of the powder). The proposed model has been experimentally checked with the compressibility curves obtained with five metal powders of different types. The agreement between the model and experimental data is reasonable over the tested pressure range.

show abstract

“…However, these limits cannot be applied to powdered materials, since their maximum porosity is always much lower than 1. Only the expressions of Loeb [65], McLachlan [70], Gruzdev et al [71], Pabst and Gregorová [74], Solonin and Chernyshev [75] and Montes et al [72,[76][77][78] take this upper limit of porosity into account, being therefore applicable in the high porosity range of powdered materials. In addition, the expressions of McLachlan [70] and Montes et al [72,[76][77][78] are specific cases of Equation (1).…”

Section: G R Equation Formmentioning

confidence: 99%

Influence of the Total Porosity on the Properties of Sintered Materials—A Review

Fernández

Rosa

Urban

et al. 2021

Metals

View full text Add to dashboard Cite

Porosity is a characteristic present in most sintered materials, full densification only being achieved in special cases. For some sintered materials, porosity is indeed a desired characteristic, serving for the intended application of the material. In any case, the porosity present in materials can have a strong effect on some of their properties, both structural and functional. In this paper, some of the expressions proposed to describe the influence of the total porosity on the effective properties of sintered materials are examined. Moreover, a universal expression (with two fitting parameters) valid to satisfactorily represent all the analysed behaviours is proposed. One of these parameters can be assimilated to the tap porosity of the powders used to manufacture the material. The properties examined were elastic moduli, ultimate strength, thermal and electrical conductivities, magnetic characteristics, and other properties directly related to these ones. The study is valid for sintered materials, both metallic and ceramic, with a homogeneous and non-texturised microstructure.

show abstract

Effect of pressing process parameters on the thermal conductivity of cold-pressed porous powder composites

Cited by 5 publications

References 1 publication

Determination of Thermal Conductivity of Mn-Al Powder Compacts using An Inverse Heat Transfer Procedure

Determination of Thermal Conductivity of Mn-Al Powder Compacts using An Inverse Heat Transfer Procedure

On the compressibility of metal powders

Influence of the Total Porosity on the Properties of Sintered Materials—A Review

Contact Info

Product

Resources

About