High strength retention and dimensional stability of silicone/alumina composite panel under fire

Xiong, Yuanlu; Shen, Qiang; Fei, Chen; Luo, Guoqiang; Yu, Kan; Zhang, Lianmeng

doi:10.1002/fam.1107

Cited by 30 publications

(21 citation statements)

References 18 publications

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“…Ceramization effect is based on sticking mineral particles dispersed in polymer matrix together in different processes, generally in the presence of fluxing agent [1][2][3][4][5][6][7][8]. Even without the addition of inorganic filler of relatively low softening point temperature (fluxing agent like glass oxide frits), the effect of fire char formation can be observed, but its durability and shape preservation leave much to be desired, especially when ceramization occurs at quite low temperature (550-800°C) [9][10][11][12][13][14][15]. Polymer materials (especially based on fully organic thermoplastics or elastomers) exposed to fire undergo strong thermal degradation and destruction [16][17][18][19][20][21] very often accompanied by the effect of burning drops, which can significantly increase the spread of flames [22].…”

Section: Introductionmentioning

confidence: 99%

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Influence of surface-modified montmorillonites on properties of silicone rubber-based ceramizable composites

Anyszka

Bieliński

Pędzich

et al. 2014

J Therm Anal Calorim

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Ceramizable (ceramifiable) silicone rubberbased composites are modern elastomeric materials for fire protection application. The most important sector of economy using such materials is cable industry because there are special types of electric circuits that have to keep working in the case of fire. These kinds of composites can create ceramic phase protecting copper wire from melting under high temperature. When temperature increases, polymer matrix degrades (creating silica residue as one of the products) and mineral particles dispersed in silicone rubber matrix stick together creating stiff, durable, insulating and porous ceramic skin. In this paper, the influence of surface modification of montmorillonite with quaternary ammonium salts on ceramization of their silicone rubber composites is presented. Filler modification was studied, determining changes to its surface energy and thermal stability. Mechanical properties, flammability and thermal stability of composites were determined. Ceramization of the composites was discussed from the point of view of their mechanical properties and structure of ceramic phase after heat treatment, determined by compression stress tests, porosimetry and scanning electron microscopy adequately. Results show that type of modifier applied strongly affects properties of silicone rubber-based ceramizable composites before and after ceramization. Samples containing surface-modified montmorillonite produce significantly less heat during their thermal decomposition than composite filled with unmodified montmorillonite. Moreover, incorporation of montmorillonite modified with ammonium salt of linear organic chain causes the creation of nano-porous structure after ceramization. On the one hand, it facilitates heat insulation, but on the other hand, high total volume of pores adversely affects mechanical endurance of the ceramic phase.

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Section: Introductionmentioning

confidence: 99%

“…The composites exposed to flames and elevated temperature create ceramic phase protecting wire and ensure electric integration of the circuit up to 120 min. The family of these materials is still increasing, being the result of more and more research devoted to this issue [1][2][3][4][5][6][7][8][9][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Influence of surface-modified montmorillonites on properties of silicone rubber-based ceramizable composites

Anyszka

Bieliński

Pędzich

et al. 2014

J Therm Anal Calorim

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“…Wang J. et al developed a glassy frit facilitating ceramification of remarkably low softening point temperature of 400°C [15]. Whereas Xiong et al proposed a solid-state sintering mechanism as an explanation of highly loaded silicone composites ceramification [16]. Many studies describe effects of incorporation of different additives on properties of ceramifiable silicone composites, such as organic and mineral fibers [17], carbon fibers [18], organo-modified montmorillonites (O-MMT) [19], cenospheres covered with iron [20,21] or silsesquioxanes [22,23].…”

Section: Introductionmentioning

confidence: 99%

“…(2) Sintering of mineral filler particles due to condensation of hydroxyl groups present on their surface [16,40]. (3) Synthesis of new mineral phases as a result of reaction between refractory filler particles and silica produced caused by thermooxidative degradation of silicone matrix.…”

Section: Introductionmentioning

confidence: 99%

Effect of mineral filler additives on flammability, processing and use of silicone-based ceramifiable composites

et al. 2017

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The aim of this work is to describe the changes in the properties of ceramifiable silicone rubber-based composites caused by the incorporation of novel alternative minerals in comparison to other popular, widely utilized fillers. TiO 2 , calcined kaolin and calcium-based minerals mix (CbMix) consisting of CaO (6.26 wt%), CaCO 3 (26.18 wt%) and Ca(OH) 2 (67.56 wt%) have not been considered as a dispersed phase of ceramifiable silicone composites destined for wire covers yet. Mineral fillers: TiO 2 (anatase), mica (phlogopite), CbMix, CaCO 3 , Al(OH) 3 , kaolin and calcined kaolin affect the processing and the various properties of silicone rubber-based composites destined for wire covers differently. The propertiesflammability, smoke intensity, micromorphology and mechanical durability after ceramification-are assessed by measuring: the kinetics of vulcanization, stress at different levels of elongation, tensile strength and the elongation at break of the materials. Although the curing process of the composites is disturbed by the addition of CbMix, it benefits from an increase in oxygen index value, which reaches 31.4%. What is more, also its flammability parameters measured by cone calorimetry improve, such as the total heat released (THR) reaching 9.3 MJ/m 2 . Samples containing kaolin and calcined kaolin exhibit the best mechanical properties before ceramification, whereas composites filled with calcium-based powders (CbMix, CaCO 3 ) mechanically display the strongest mineral char after heat treatment, possibly due to a more homogenous micromorphology and the creation of calcium silicates at elevated temperature. Significant amounts of wollastonite, parawollastonite and pseudowollastonite are visible in their structure after ceramification.

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“…Creation of the ceramic structure can take place in several ways: (1) formation of a continuous and porous structure involving amorphous fluxing agent, which softens in elevated temperature and sticks thermally stable mineral particles together [10], (2) creation of silica connections between particles of mineral filler during thermooxidative degradation of silicone matrix [11,12] and (3) creation of silicon oxycarbide (SiOC) ceramic phase due to deposition, crosslinking and volatilization of siloxane macromolecules on the surface of reinforcing silica particles dispersed in silicone matrix in the presence of platinum complex [13]. showed that also boro-siloxanes can be used as efficient fluxing agent even for organic polymers [15].…”

Section: Introductionmentioning

confidence: 99%

Effect of carbon fibers on thermal properties and mechanical strength of ceramizable composites based on silicone rubber

Imiela

Anyszka

Bieliński

et al. 2015

J Therm Anal Calorim

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Ceramizable (ceramifiable) silicone composites are one of the most important elastic technical materials produced industrially. These composites are commonly used to increase flame retardancy of electrical cables and to ensure integrity of electricity network during fire by their ability to create a continuous ceramic structure. In this paper, ceramizable silicone composites filled with different contents of carbon fibers were tested. The research was focused on the characterization of ceramic structure created during heat treatment of the composites and thermal properties of the composites. For this purpose, morphology (SEM) and compression strength of the ceramic structures were studied. To describe process of ceramic structures creation, TG/DSC analysis was done. These tests have demonstrated that, the increase in carbon fibers amount improves the mechanical properties of ceramic structure regardless of heat treatment conditions.

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High strength retention and dimensional stability of silicone/alumina composite panel under fire

Cited by 30 publications

References 18 publications

Influence of surface-modified montmorillonites on properties of silicone rubber-based ceramizable composites

Influence of surface-modified montmorillonites on properties of silicone rubber-based ceramizable composites

Effect of mineral filler additives on flammability, processing and use of silicone-based ceramifiable composites

Effect of carbon fibers on thermal properties and mechanical strength of ceramizable composites based on silicone rubber

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