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Zusammensetzung fuer hochtemperaturfeste, pyrolitisch keramisierende Beschichtungen

Composition giving high temperature-resistant coating converted to ceramic by pyrolysis - contains particulate inorganic fillers and fibres in matrix of di methyl-siloxane or polyurethane elastomer, useful for moulding, sheet material or coating on metal, ceramics or textile.
: Kuglstatter, W.; Wasmann, F.; Menke, K.; Huels, A.

Frontpage ()

DE 1997-19719876 A: 19970512
EP 1998-108559 A: 19980511
EP 878520 B1: 20030305
Patent, Electronic Publication
Fraunhofer ICT ()

Composition for coatings that are resistant to high temperatures, and are converted to ceramics by pyrolysis, contains 35-60, preferably 40-50 wt.% embedded inorganic fillers, embedded in an elastomer matrix of the dimethylsiloxane or polyurethane group. The fillers comprise 1-8, preferably 3-5 wt.% silicon carbide (SiC) with an average particle size of 1-15, preferably 1-5 mu m, 20-50, preferably 30-45 wt.% amorphous silicon dioxide (SiO2) with an average particle size of 2-50, preferably 5-15 mu m and 0.5-5.0 wt.% highly disperse, hydrophilic metal oxides selected from SiO2, titanium dioxide (TiO2) and zirconium dioxide (ZrO2) with an average particle size of 0.01-2.0 mu m and also 0.5-6 wt.% carbon, ceramic and/or silicate fibres with an average length of 0.5-10, preferably 1-5 mm. USE - The composition is used for making mouldings by casting, spraying or rotational moulding in moulds coated with release agent, sheet material or coatings adhering to metal or ceramic substrate; or ap plied to webs or prefinished textiles, e.g. fireproof gloves, by dipping, lamination or coating (all claimed). They are also useful for other protective clothing and protecting equipment, e.g. for coating metal and ceramic components exposed to hot gas streams for minutes. ADVANTAGE - Filled diphenyl- and phenylmethylsiloxane copolymers used in aerospace technology are costly and have limited mechanical properties. The present matrix materials are available commercially in large quantities at low cost but usually have low resistance to high temperature or burn easily. With suitable fillers, exposure to a flame converts them to a porous ceramic layer with high strength and high thermal insulation power.