Thermal protection device for satellite, comprises thermal mattress with alternating sheets, and insulating material spacers, where sheets comprise thermoplastic film material, single metallization layer, and internal and external sheets

The thermal protection device comprises a thermal mattress (MLI) with alternating sheets (1INT, 1EXT, 2), and spacers (3) of insulating material. The sheets comprise a thermoplastic film material resistant to a temperature above 150[deg] C, single metallization layer, an internal sheet present in side of the satellite, an external sheet in opposite side of the satellite, and an intermediate sheet between internal and external sheets. The metallization layer is present on a surface opposite to the surfaces of the satellite. The external sheet has a specularity of lower than 70%. The thermal protection device comprises a thermal mattress (MLI) with alternating sheets (1INT, 1EXT, 2), and spacers (3) of insulating material. The sheets comprise a thermoplastic film material resistant to a temperature above 150[deg] C, single metallization layer, an internal sheet present in side of the satellite, an external sheet in opposite side of the satellite, and an intermediate sheet between internal and external sheets. The metallization layer is present on a surface opposite to the surfaces of the satellite. The external sheet has a specularity of lower than 70%. The thermoplastic material allows flow of electrostatic charges for protection of thermal mattress, and has a volume resistivity of lower than 10 1>7>omega cm and a tear resistance of greater than 4 N/mm for a thickness of 50 mu m. The sheets are connected by thermo-adhesion or other thermal process. L'invention a pour objet de permettre la fabrication de matelas de protection thermique (MLI) pour satellite présentant des caractéristiques nettement supérieures à celles des matelas de type « MLI » actuels en termes de résistance à la déchirure, de spécularité, et d'écoulement des charges électrostatique, tout en autorisant un fonctionnement à des températures extrêmes, notamment supérieures à 150 °C. A cet effet, l'invention propose la fabrication de matelas de protection thermique (MLI) dont les feuilles (1 INT, 1 EXT, 2) sont constituées d'un film en matériau thermoplastique et d'au moins une couche de métallisation.