Effect of Iron Silicon Addition in the Sintering Behavior of Silicon Nitride

Fh., Jamil Duailibi; Bressiani, José Carlos

doi:10.4028/www.scientific.net/kem.89-91.253

Cited by 2 publications

(2 citation statements)

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“…Fe and Al impurities in the Si powder were reported to promote the formation of β-Si 3 N 4 . [13][14][15] The chemical contents of Fe, Al, and Ca in the 2 mm Si particles were 0.33, 0.13, and 0.04 wt% higher than those in the 7 mm powder, respectively. Consequently, the enhancement of the α-to-β phase transformation in the specimens containing fine Si powder was believed to be caused by impurities such as Fe and Al.…”

Section: Resultsmentioning

confidence: 95%

“…In addition, 0.1 -0.5 wt% of Fe was reported to promote the α-to-β phase transformation. 14,15) The incorporation of sintering additives from the milling media during the fine grinding of Si particles is another reason for the enhanced phase transformation. The crushed Si powder contained 0.25 wt% of sintered Si 3 N 4 , originated from the milling balls and jar.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Densification of Reaction Bonded Silicon Nitride with the Addition of Fine Si Powder - Effects on the Sinterability and Mechanical Properties

Lee¹,

Cho²,

Park³

et al. 2013

Journal of the Korean Ceramic Society

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The densification behavior and strength of sintered reaction bonded silicon nitrides (SRBSN) that contain Lu 2 O 3-SiO 2 additives were improved by the addition of fine Si powder. Dense specimens (relative density: 99.5%) were obtained by gas-pressure sintering (GPS) at 1850 o C through the addition of fine Si. In contrast, the densification of conventional specimens did not complete at 1950 o C. The fine Si decreased the onset temperature of shrinkage and increased the shrinkage rate because the additive helped the compaction of green bodies and induced the formation of fine Si 3 N 4 particles after nitridation and sintering at and above 1600 o C. The amount of residual SiO 2 within the specimens was not strongly affected by adding fine Si powder because most of the SiO 2 layer that had formed on the fine Si particles decomposed during nitridation. The maximum strength and fracture toughness of the specimens were 991 MPa and 8.0 MPa•m 1/2 , respectively.

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Section: Resultsmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 99%