Production of stainless steel filters by liquid phase activated Gravity sintering

Danninger, Herbert; Jangg, G.; Giahi, Masoud

doi:10.1002/mawe.19880190607

Cited by 13 publications

(17 citation statements)

References 2 publications

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“…For gravity sintered filters it has been shown that even relative large amounts of boride eutectic do not do any harm as long as they are isolated, i.e. concentrated at the sintering necks [22]. As soon as however this boride eutectic forms a continuous network in the sintered body, severe embrittlement occurs.…”

Section: Mechanisms Of Sintering Activation and Drawbacksmentioning

confidence: 99%

Embrittling Components in Sintered Steels: Comparison of Phosphorus and Boron

Danninger

Vassileva

Gierl‐Mayer

2017

Powder Metallurgy Progress

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Section: Mechanisms Of Sintering Activation and Drawbacksmentioning

confidence: 99%

Embrittling Components in Sintered Steels: Comparison of Phosphorus and Boron

Danninger

Vassileva

Gierl‐Mayer

2017

Powder Metallurgy Progress

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“…9). The presence of nitrogen inhibits eutectic reactions between iron and iron boride, but enhances the reactions between boron and nitrogen, resulting in the formation of an inert phase that does not improve the sintering rate (on the other hand, BN is used for the activation of sintering in vacuum [9]). There was therefore no improvement in measured mechanical properties.…”

Section: Sintering In Nitrogen Atmospherementioning

confidence: 99%

Characterization of the distribution of the sintering activator boron in powder metallurgical steels with SIMS

et al. 2004

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Powder metallurgy is a well-established method for manufacturing ferrous precision parts. A very important step is sintering, which can be strongly enhanced by the formation of a liquid phase during the sintering process. Boron activates this process by forming such a liquid phase at about 1200 degrees C. In this work, the sintering of Fe-B was performed under the protective atmospheres of hydrogen, argon or nitrogen. Using different grain sizes of the added ferroboron leads to different formations of pores and to the formation of secondary pores. The effect of boron was investigated by means of Secondary Ion Mass Spectrometry (SIMS) supported by Scanning Electron Microscopy (SEM) and Light Microscopy (LM). To verify the influence of the process parameters on the mechanical properties, the microstructure (pore shape) was examined and impact energy measurements were performed. The concentrations of B in different samples were varied from 0.03-0.6 weight percent (wt%). Higher boron concentrations are detectable by EPMA, whereas the distributions of boron in the samples with interesting overall concentration in the low wt% range are only detectable by means of SIMS. This work shows that the distribution of boron strongly depends on its concentration and the sintering atmosphere used. At low concentration (up to 0.1 wt%) there are boride precipitations; at higher concentration there is a eutectic iron-boron grain boundary network. There is a decrease of the impact energy observed that correlates with the amount of eutectic phase.

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“…The compaction pressure was applied normally to compound. [11,12,13] In a few investigations only, elemental the dilatometry direction, i.e., the direction along which boron was used. [9,10,14] German et al, [14] as an example, used dimensional changes were measured.…”

Section: Introductionmentioning

confidence: 99%

Dilatometry study of the sintering behavior of boron-alloyed Fe-1.5 pct Mo powder

Molinari

Gialanella

Straffelini

et al. 2000

Metall Mater Trans A

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The effect of different boron concentrations on the sintering behavior of an Fe-1.5 pct Mo (wt pct) prealloyed powder was investigated. Sintering was carried out in a dilatometer so that all dimensional changes involved with the densification process could be followed. Several transformations were found to occur by heating powder compacts to 1200 ЊC and then cooling them to room temperature. At high temperatures, boron promoted the formation of liquid phases that, through a more-efficient sintering kinetics, promoted a satisfactory densification. Faster heating rates also had beneficial effects on the density of the final products. From a microstructural point of view, boron tended to destabilize the ferritic phase and to form iron and molybdenum borides. These borides can be found both in the intergranular regions, with a typical eutectic morphology, and dispersed in the ferritic matrix, in the form of nanometer-sized precipitates. This feature, having a significant effect on the hardness of the bulk material, has been ascribed to a bainite-like precipitation of borides from an undercooled austenitic phase.

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Production of stainless steel filters by liquid phase activated Gravity sintering

Cited by 13 publications

References 2 publications

Embrittling Components in Sintered Steels: Comparison of Phosphorus and Boron

Embrittling Components in Sintered Steels: Comparison of Phosphorus and Boron

Characterization of the distribution of the sintering activator boron in powder metallurgical steels with SIMS

Dilatometry study of the sintering behavior of boron-alloyed Fe-1.5 pct Mo powder

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