ISRO has achieved a significant milestone by successfully testing a domestically developed Satellit (KC20WN)

ISRO has successfully conducted tests on an indigenous Stellite (KC20WN) alloy divergent nozzle for the fourth stage of the PSLV, replacing the previously imported Columbium (C103) and achieving a remarkable 90% reduction in costs.

What is a Divergent Nozzle?

The divergent nozzle is the expanded section of a rocket engine that accelerates exhaust gases to produce thrust. It endures significant thermal and mechanical stress during rocket operations, often exceeding temperatures of 1100°C.

Why is the Divergent Nozzle Important?

This component is essential for controlling the direction and speed of thrust, which is vital for stabilizing and guiding the rocket during its ascent. Any material failure in this area could result in critical mission losses.

Previous Material Used: Columbium (C103), a rare and heat-resistant metal, was previously imported for use in the PSLV’s fourth-stage nozzle.

New Material Developed:

Stellite (KC20WN), a cobalt-based alloy enhanced with Chromium, Nickel, Tungsten, and Iron, has been developed and tested domestically at ISRO’s Propulsion Complex in Mahendragiri.

Significance of Using Stellite:

Self-reliance: This development reduces reliance on expensive foreign imports.

Cost Efficiency: It offers up to 90% savings compared to nozzles made from Columbium.

Strategic Autonomy: This advancement strengthens India’s aerospace supply chain and supports the Atmanirbhar Bharat initiative in space technology.

Future Missions: It sets the stage for the use of indigenous components in launch vehicles, satellites, and deep-space exploration missions.