Development of a technology of compaction of increased-density parts using gas drainage methods

Mamedov, A. T.

doi:10.1007/bf00559525

Cited by 2 publications

(1 citation statement)

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“…The general design and operation principles of the porous die are discussed in detail elsewhere. 20 In order to ensure the effective operation of the developed system, the porous die material should have the following characteristics: a relatively high open porosity with a large amount of the small open pores, a low friction coefficient and high structural strength and high antiscuff properties. The composition used for the production of the porous die was Fe-(0 .…”

Section: Experimental Methodsmentioning

confidence: 99%

New technological approach to fabrication of high density PM parts by cold pressing sintering

Mamedov¹,

Mamedov²

2004

Powder Metallurgy

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A new technological approach to the fabrication of high density powder metallurgy (PM) parts via single pressing sintering, allowing cold compaction to be performed without admixed lubricants, has been studied. The influence of in pore gas on the compacts' green density and their sintered properties were evaluated. A mathematical expression relating in pore gas pressure in the compacts to the green density was developed. The expression showed that in order to reduce the negative influence of gases trapped in the pores it is necessary to ensure effective air drainage from the compaction zone. In order to ensure sufficient air evacuation during cold compaction, a new design of porous die was developed. The behaviour of powder mixes with different lubricants during cold compaction in porous die was investigated. All the test conditions were evaluated in terms of green and sintered properties, including the ejection force, green and sintered densities, tensile strength and surface hardness. In the context of the experimental work, compaction in porous die promoted the improved combination of green and sintered properties compared with compaction in conventional dies. PM/1116Professor A. T. Mamedov is the Head of the Casting and Welding Manufacture

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