Chemicals Thermal protection
ISRO has put on offer a bunch of technologies for thermal protection, for different specific applications.
- A low-density TPS based on silicone polymer, which is room temperature curable and which can be applied either by brushing or by spraying. ISRO calls this SSP P70. ISRO says that the remarkable features of this system are low density of 0.38 g/cc, lower thermal conductivity, high specific heat, good ageing resistance and compatibility with wide variety of substrates. The product can be applied to desired thickness, depending upon the thermal environment of the application. “Reasonable mechanical strength and adhesive properties with large number of substrates has been demonstrated by the system,” says ISRO. Further, the product retains its properties at temperatures up to 150 degrees C. As such, it can be tailored for use as coating on outdoor metal substrates. The coatings are also moisture and water impermeable.
- Another TPS technology that ISRO offers is a Medium Density Ablative composite, which was developed for providing thermal protection to re-entering space capsule, under moderate heat flux conditions (10-40 W/cm2). MDA, bonded to the Carbon Fibre Reinforced Plastics (CFRP) and aluminum substrates has been successfully used as thermal protection system (TPS) for the base region of the first Space Capsule Recovery Experiment. This proprietary TPS is based on an ablative polymer, reinforcing fibre and micro balloon fillers, mixed in a specified composition and cured under controlled compaction to achieve the required density (Final cure temperature: 180°C). This composite will be machined to the design requirements and bonded to the aero thermo structure (ATS) using. This product finds application in lightweight thermo-structural material for thermal protection & insulation.
- Yet another TPS technology is a process of thermal control coating for spacecraft subsystem component made of materials such as Anodized Aluminum, Chromated Aluminum, Bare Aluminum, Electroless Nickel Plated Invar, Bare Invar, Silver Plated Aluminum, Chromated Magnesium, Black Anodic Coated Magnesium etc for use in space industry but has application in other industries also. Black paint is utilized on the interior of spacecraft to facilitate radiant heat transfer among internal components. The process has wide commercial and special applications.
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For further details, contact:
Technology Transfer and Industrial Coordination Division
Vikram Sarabhai Space Centre (VSSC), ISRO
Ph:0471-256 4081/256 5133 Fax: 0471-2564134