Influence of application method and sintering temperature on porosity and thermal conductivity of two commercial silicon carbide based castables

Jussi  Silvonen; Viivi  Ruusila; Erkki Levänen; Mikko  Uusitalo

Influence of application method and sintering temperature on porosity and thermal conductivity of two commercial silicon carbide based castables

Jussi Silvonen
, Viivi Ruusila
, Erkki Levänen
, Mikko Uusitalo

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Scientific

Abstract

Information about thermal conductivity of refractory castables is
crucial in heat conducting structures. Two commercial castables
were studied to find out the effect of silicon carbide content (58-
67 %) and installation method on thermal conductivity. One cast-
able was designed to be installed by casting and the other one was
shotcrete castable. The shotcrete castable was casted and shot-
creted in to metal mold sized 200x200x50 mm. The other castable
was casted in laboratory conditions and on site. Porosities and
thermal conductivities were measured from samples after heat
treatment at 400, 600, 800 and 1000 ˚C. Thermal conductivities
were measured by transient plane source method, porosities were
measured by Archimedes’ method and microstructures were char-
acterized by scanning electron microscopy. Thermal conductivi-
ties varied from 6.8-16.3 W/mK and porosities 12.74-21.92 %.
Thermal conductivity of measured samples increased with SiC
content and higher heat treatment temperature as expected. Po-
rosities and thermal conductivities in castables casted in labora-
tory and on site varied only slightly. In shotcrete castable applied
by casting the porosity and thermal conductivity were higher than
in shotcreted sample. So the interconnection between low poros-
ity and high thermal conductivity was not as clear as expected.

Original language	English
Title of host publication	UNITECR2015 – 14th Biennial Worldwide Congress
Publication status	Published - 18 Sept 2015
Publication type	B3 Article in conference proceedings
Event	UNITECR Unified International Technical Conference on Refractories - , United Kingdom Duration: 1 Jan 1991 → …

Conference

Conference	UNITECR Unified International Technical Conference on Refractories
Country/Territory	United Kingdom
Period	1/01/91 → …

Cite this

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title = "Influence of application method and sintering temperature on porosity and thermal conductivity of two commercial silicon carbide based castables",

abstract = "Information about thermal conductivity of refractory castables is crucial in heat conducting structures. Two commercial castables were studied to find out the effect of silicon carbide content (58- 67 \%) and installation method on thermal conductivity. One cast- able was designed to be installed by casting and the other one was shotcrete castable. The shotcrete castable was casted and shot- creted in to metal mold sized 200x200x50 mm. The other castable was casted in laboratory conditions and on site. Porosities and thermal conductivities were measured from samples after heat treatment at 400, 600, 800 and 1000 ˚C. Thermal conductivities were measured by transient plane source method, porosities were measured by Archimedes{\textquoteright} method and microstructures were char- acterized by scanning electron microscopy. Thermal conductivi- ties varied from 6.8-16.3 W/mK and porosities 12.74-21.92 \%. Thermal conductivity of measured samples increased with SiC content and higher heat treatment temperature as expected. Po- rosities and thermal conductivities in castables casted in labora- tory and on site varied only slightly. In shotcrete castable applied by casting the porosity and thermal conductivity were higher than in shotcreted sample. So the interconnection between low poros- ity and high thermal conductivity was not as clear as expected.",

author = "Jussi Silvonen and Viivi Ruusila and Erkki Lev{\"a}nen and Mikko Uusitalo",

note = "EXT={"}Uusitalo, Mikko{"}; UNITECR Unified International Technical Conference on Refractories ; Conference date: 01-01-1991",

year = "2015",

month = sep,

day = "18",

language = "English",

isbn = "978-3-9815813-1-7",

booktitle = "UNITECR2015 – 14th Biennial Worldwide Congress",

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Influence of application method and sintering temperature on porosity and thermal conductivity of two commercial silicon carbide based castables. / Silvonen, Jussi ; Ruusila, Viivi ; Levänen, Erkki et al.
UNITECR2015 – 14th Biennial Worldwide Congress. 2015. Proceeding 224.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Scientific

TY - GEN

T1 - Influence of application method and sintering temperature on porosity and thermal conductivity of two commercial silicon carbide based castables

AU - Silvonen, Jussi

AU - Ruusila, Viivi

AU - Levänen, Erkki

AU - Uusitalo, Mikko

N1 - EXT="Uusitalo, Mikko"

PY - 2015/9/18

Y1 - 2015/9/18

N2 - Information about thermal conductivity of refractory castables is crucial in heat conducting structures. Two commercial castables were studied to find out the effect of silicon carbide content (58- 67 %) and installation method on thermal conductivity. One cast- able was designed to be installed by casting and the other one was shotcrete castable. The shotcrete castable was casted and shot- creted in to metal mold sized 200x200x50 mm. The other castable was casted in laboratory conditions and on site. Porosities and thermal conductivities were measured from samples after heat treatment at 400, 600, 800 and 1000 ˚C. Thermal conductivities were measured by transient plane source method, porosities were measured by Archimedes’ method and microstructures were char- acterized by scanning electron microscopy. Thermal conductivi- ties varied from 6.8-16.3 W/mK and porosities 12.74-21.92 %. Thermal conductivity of measured samples increased with SiC content and higher heat treatment temperature as expected. Po- rosities and thermal conductivities in castables casted in labora- tory and on site varied only slightly. In shotcrete castable applied by casting the porosity and thermal conductivity were higher than in shotcreted sample. So the interconnection between low poros- ity and high thermal conductivity was not as clear as expected.

AB - Information about thermal conductivity of refractory castables is crucial in heat conducting structures. Two commercial castables were studied to find out the effect of silicon carbide content (58- 67 %) and installation method on thermal conductivity. One cast- able was designed to be installed by casting and the other one was shotcrete castable. The shotcrete castable was casted and shot- creted in to metal mold sized 200x200x50 mm. The other castable was casted in laboratory conditions and on site. Porosities and thermal conductivities were measured from samples after heat treatment at 400, 600, 800 and 1000 ˚C. Thermal conductivities were measured by transient plane source method, porosities were measured by Archimedes’ method and microstructures were char- acterized by scanning electron microscopy. Thermal conductivi- ties varied from 6.8-16.3 W/mK and porosities 12.74-21.92 %. Thermal conductivity of measured samples increased with SiC content and higher heat treatment temperature as expected. Po- rosities and thermal conductivities in castables casted in labora- tory and on site varied only slightly. In shotcrete castable applied by casting the porosity and thermal conductivity were higher than in shotcreted sample. So the interconnection between low poros- ity and high thermal conductivity was not as clear as expected.

M3 - Conference contribution

SN - 978-3-9815813-1-7

BT - UNITECR2015 – 14th Biennial Worldwide Congress

T2 - UNITECR Unified International Technical Conference on Refractories

Y2 - 1 January 1991

ER -

Influence of application method and sintering temperature on porosity and thermal conductivity of two commercial silicon carbide based castables

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