Expands combustion gas to generate thrust. The extension is the large bell below the throat.
What decides the purchase: Expansion ratio · exit diameter · contour type (bell, aerospike) · cooling method
Typical materials: Niobium C-103, Haynes 230, Inconel, silica-phenolic ablatives, carbon-carbon
Typical processes: Spin forming, tube-wall brazing, additive, ablative layup
What changes when it has to fly: Vacuum-optimised extensions have large expansion ratios and are often radiatively cooled, so material choice is driven by emissivity and creep at temperature.
Engineering reference written by us, not a supplier claim.
No Indian supplier in this index makes nozzle and nozzle extension, plus 3 international.
| Supplier | Location | Certifications | Evidence |
|---|---|---|---|
| ArianeGroup intl | international | — | stated capability |
| Frontier Aerospace intl | international | — | stated capability |
| Ursa Major intl | international | — | stated capability |
Certifications are as published by each company and unverified. "Product indexed" means we hold an actual product record; "stated capability" means the company says it does this.