Tungsten Copper Alloy Throat Insert
Tungsten-copper alloy throat inserts are key lining materials for the throat of solid rocket motor nozzles. Belonging to the category of metal alloy composite materials, they are primarily used in the aerospace field. Their core function is to withstand the impact of high-temperature, high-speed exhaust gas flow, maintain throat shape stability, and ensure engine thrust and efficiency. Tungsten-copper throat inserts are typically manufactured using a tungsten-copper infiltration process, combining the excellent properties of both tungsten and copper. Tungsten provides a high melting point (approximately 3410℃), high strength, and a low coefficient of thermal expansion, while copper contributes high thermal conductivity and ductility. During operation, the copper evaporates and vaporises upon heating, carrying away a significant amount of heat, while the remaining tungsten framework maintains structural integrity, enabling it to withstand instantaneous high temperatures exceeding 2000℃ and the scouring environment containing Al₂O₃ droplets. Compared to graphite and ceramic matrix composites, tungsten-copper alloys exhibit superior resistance to ablation and thermal shock, making them suitable for the extreme conditions of high-energy propellants. For example, tungsten-copper infiltrated composites can maintain a strength of 44 kg/mm² at 1900℃.
