Mikrostruktura kompozytów silikonowych po ceramizacji

• Autorzy: Pędzich Z. , Bieliński D.

Warianty tytułu

EN

Microstructure of ceramized silicone composites

• Języki publikacji: PL

Abstrakty

PL

Opisano różnice mikrostrukturalne powstające po ceramizacji komercyjnych kompozytów silikonowych stosowanych na ognioodporne pokrycia przewodów elektrycznych. Z punktu widzenia zastosowania tych materiałów bardzo istotne jest, aby powstająca w trakcie degradacji polimerowego składnika warstwa ceramiczna była w stanie zapewnić odpowiednią wytrzymałość osłony oraz jej integralność (ciągłość). Zbadano mikrostruktury powstające w trakcie ceramizacji kompozytów w zakresie wartości temperatury 600-1050°C oraz oszacowano wytrzymałość tworzyw po ceramizacji.

EN

The paper describes microstructural differences created during ceramization of commercially manufactured silicone composites used for fire resistant shields of electrical cables. From application point of view is crucial that degradation of polymer component has to result in the creation of ceramic layer, which could prevent adequate strength and integrity of cable shield. Microstructures of the composites subjected to ceramization in the temperature range 600-1050°C were determined, as well as strength of the ceramized materials estimated. It was recognized that the way of polymer decomposition, determined the porosity of ceramized structure. The lowest porosity after ceramization at 600 and 800°C showed polymer with the higher temperature of decomposition temperature. Microstructural observations confirmed differences came from the different mineral composition of investigated materials. Porosity in all investigated samples evolved in different way with the increase of ceramization temperature. Analyses showed that in samples A and B porosity has changed significantly after firing at 1050°C. The total porosity was reduced about 50% when compared with porosity after firing at 600°C. Porosity in sample E was much more stable with temperature, and contrary to A and B, at the highest firing temperature the total volume of open porosity was increased. Results of performed investigations indicate that the suitable ceramized layer could be achieving by a few methods (different composition of the material). Performed experiments suggest that the range of temperature of 600-800°C is decisive for the integrity of ceramized material. At this range the ultimate degradation of polymer component takes place and ceramic phases present in the composite are not bounded so fast. In composites with increased polymer matrix degradation temperature, the microstructure of ceramized structure shows the lowest porosity and the highest strength what is profitable for application of such materials.

Słowa kluczowe

PL

kabel; palność; kompozyt silikonowy; ceramizacja; wytrzymałość mechaniczna

EN

cable; flammability; silicone composite; ceramization; mechanical strength

• Wydawca: Wydawnictwo Politechniki Częstochowskiej
• Czasopismo: Kompozyty
• Rocznik: 2010
• Tom: R. 10, nr 3
• Strony: 249--254
• Opis fizyczny: Bibliogr. 3 poz., rys., tab.

Twórcy

autor

Pędzich Z.

autor

Bieliński D.

• Akademia Górniczo-Hutnicza, Wydział Inżynierii Materiałowej i Ceramiki, Katedra Ceramiki Specjalnej,

Bibliografia

• [1] Processable silicone composite materials having high temperature resistance, US Patent 5552466, 03.08.1996.
• [2] Hamdani S., Longuet C. Perrin D., Lopez-Cuesta J.-M., Ganachaud F., Flame retardancy of silicone-based materials, Polymer Degradation and Stability 2009, 94, 465-495.
• [3] Hayashida K., Tsuge S., Othani H., Flame retardant mechanism of polydimethylsiloxane material containing compound studied by analytical pyrolysis techniques and alkaline hydrolysis gas chromatography, Polymer 2003, 44, 5611-5616.