The aerospace field has extremely stringent requirements for the performance of materials. Silicone rubber, due to its unique combination of properties, plays an irreplaceable and crucial role in this field. However, it also faces a series of technical challenges.
In the sealing systems of aerospace vehicles, silicone rubber is one of the core materials. When aircraft fly at high altitudes, they face extreme temperature changes (from dozens of degrees below zero to the high - temperature aerodynamic heating environment), strong ultraviolet radiation, and high - vacuum and other harsh conditions. Silicone rubber seals, with their excellent high - and low - temperature resistance, can maintain good elasticity and sealing performance within such extreme temperature ranges, ensuring the sealing of key parts such as the aircraft cabin, fuel system, and hydraulic system, preventing gas and liquid leakage, and ensuring the safe operation of the aircraft. For example, at the connection of the fuel pipeline of an aircraft engine, the silicone rubber seal can withstand the erosion and vibration of high - temperature fuel, ensuring the stability of fuel delivery. In the door sealing of spacecraft, silicone rubber seals can still maintain a tight sealing state in a high - vacuum environment, preventing the space environment from affecting the equipment and personnel inside the cabin.
In the protection of aerospace electronic equipment, silicone rubber also has important applications. Electronic equipment needs to resist various adverse factors such as vibration, impact, moisture, and electromagnetic interference during flight. Silicone rubber has good shock - absorbing and buffering properties and can effectively absorb the vibration and impact energy received by the equipment, protecting the internal precision electronic components from damage. At the same time, its excellent electrical insulation performance can provide reliable electrical isolation for electronic equipment, preventing the impact of electromagnetic interference on the performance of the equipment. For example, in the packaging of satellite electronic equipment, silicone rubber is widely used for filling and sealing, protecting electronic components from the space environment and ensuring the stable operation of satellites in complex cosmic rays and electromagnetic environments.
However, the application of silicone rubber in the aerospace field also faces many technical challenges. First, in the extreme space radiation environment, the molecular structure of silicone rubber may change, leading to a decline in performance. Therefore, it is necessary to develop silicone rubber materials with higher radiation resistance. By optimizing the molecular structure and adding special radiation - protection additives, the stability of silicone rubber in the space radiation environment can be improved. Second, as aerospace technology develops towards higher performance and lighter weight, the requirements for the mechanical properties and lightweight of silicone rubber are also increasing day by day. How to further improve its strength and reduce its density on the basis of ensuring the original excellent properties of silicone rubber has become an urgent problem to be solved. In addition, in some special application scenarios, such as the thermal protection system of hypersonic aircraft, silicone rubber needs to withstand higher temperatures and more complex thermal stresses, which poses higher challenges to the high - temperature resistance and thermal stability of silicone rubber and requires innovative material formulations and preparation processes to deal with.
Medical Grade Liquid Silicone Rubber – MY-LSR95 AB
