The interaction of iron during the hot-pressing of silicon nitride

A. D. Stalios; J. Luyten; C. D. Hemsley; Frank L. Riley; Richard J. Fordham

doi:10.1016/0955-2219(91)90003-I

The interaction of iron during the hot-pressing of silicon nitride

A. D. Stalios, J. Luyten, C. D. Hemsley, Frank L. Riley, Richard J. Fordham

Research output › peer-review

Abstract

Microstructural analysis of a commercial hot-pressed silicon nitride containing the equivalents of 1·2 mass % MgO and 2·7 mass % Fe₂O₃, shows the existence of intergranular-phase forsterite-fayalite solid solution (olivine), together with iron silicides. The results of modelling hot-pressing experiments carried out at 1500°C with iron(III) oxide and iron additions suggest that the function of iron compounds during hot-pressing is complex, and includes the formation of low-melting transient liquids in the FeO-MgO-SiO₂ system which can be very effective densification aids. Metallic iron appears to yield readily an equally effective iron silicide liquid.

Original language	English
Pages (from-to)	75-81
Number of pages	7
Journal	Journal of the European Ceramic Society
Volume	7
Issue number	2
DOIs	https://doi.org/10.1016/0955-2219(91)90003-I
State	Published - 1991

Funding

This work has been partly supported by the Commission of the European Communities through Stimulation Action Contract ST2J-0146-UK(CD) and through EURAM programme MA1E-0037-C(A). Dr E. Gilbart provided assistance with hotpressing facilities.

Funders	Funder number
Not added	ST2J-0146-UK
Not added	MA1E-0037-C

ASJC Scopus subject areas

Ceramics and Composites
Materials Chemistry

Access to Document

10.1016/0955-2219(91)90003-I

Cite this

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title = "The interaction of iron during the hot-pressing of silicon nitride",

abstract = "Microstructural analysis of a commercial hot-pressed silicon nitride containing the equivalents of 1·2 mass % MgO and 2·7 mass % Fe2O3, shows the existence of intergranular-phase forsterite-fayalite solid solution (olivine), together with iron silicides. The results of modelling hot-pressing experiments carried out at 1500°C with iron(III) oxide and iron additions suggest that the function of iron compounds during hot-pressing is complex, and includes the formation of low-melting transient liquids in the FeO-MgO-SiO2 system which can be very effective densification aids. Metallic iron appears to yield readily an equally effective iron silicide liquid.",

author = "Stalios, {A. D.} and J. Luyten and Hemsley, {C. D.} and Riley, {Frank L.} and Fordham, {Richard J.}",

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T1 - The interaction of iron during the hot-pressing of silicon nitride

AU - Stalios, A. D.

AU - Luyten, J.

AU - Hemsley, C. D.

AU - Riley, Frank L.

AU - Fordham, Richard J.

PY - 1991

Y1 - 1991

N2 - Microstructural analysis of a commercial hot-pressed silicon nitride containing the equivalents of 1·2 mass % MgO and 2·7 mass % Fe2O3, shows the existence of intergranular-phase forsterite-fayalite solid solution (olivine), together with iron silicides. The results of modelling hot-pressing experiments carried out at 1500°C with iron(III) oxide and iron additions suggest that the function of iron compounds during hot-pressing is complex, and includes the formation of low-melting transient liquids in the FeO-MgO-SiO2 system which can be very effective densification aids. Metallic iron appears to yield readily an equally effective iron silicide liquid.

AB - Microstructural analysis of a commercial hot-pressed silicon nitride containing the equivalents of 1·2 mass % MgO and 2·7 mass % Fe2O3, shows the existence of intergranular-phase forsterite-fayalite solid solution (olivine), together with iron silicides. The results of modelling hot-pressing experiments carried out at 1500°C with iron(III) oxide and iron additions suggest that the function of iron compounds during hot-pressing is complex, and includes the formation of low-melting transient liquids in the FeO-MgO-SiO2 system which can be very effective densification aids. Metallic iron appears to yield readily an equally effective iron silicide liquid.

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