Aerospace composite curing — thermal cycling from –196°C to 1,000°C

Context

Fifth-generation airframe programmes rely on composite primary-structure sub-assemblies cured in autoclaves with precisely controlled thermal ramps. Tooling that fails to hold its dimensional profile across the thermal cycle introduces shape error into the composite part — unacceptable in airframe applications. Material options are few.

Challenge

The buyer required tooling that could survive repeated cycling between cryogenic ground operations (liquid-nitrogen adjacent environments) and sustained autoclave temperatures approaching 450°C in hot-working zones. Thermal-fatigue failure of commodity tooling had driven a search for a higher-qualification substitute.

Qualification pathway

Prof. Upadrasta Ramamurty’s metallurgy group at NTU Singapore characterised NP1 wire and derived tooling across 500+ thermal cycles spanning –196°C to 1,000°C. Lectromec — ISO/IEC 17025:2017 accredited and NASA-certified — issued aerospace-grade qualification aligned to the NAS 907 framework.

Deployment

GTX Custom Fabrication (GTX-CUSTOM) converted precision wire into engineered tooling assemblies cut, formed and spot-weld-bonded to the customer’s autoclave-cure tooling drawings. Every shipment accompanied by Certificate of Conformity and ASACERT UK specification stamp.

Performance outcome

Tooling held dimensional profile through the full thermal cycle; no thermal-fatigue failures observed across the qualification run. Programme transitioned from qualification to production supply under a multi-year framework agreement.

Citations

• NTU Singapore · Prof. Upadrasta Ramamurty · extreme-temperature cycling dataset.
• Lectromec · NASA-cert. aerospace material qualification · ISO/IEC 17025:2017.
• NAS 907 — Aerospace Standard · Wire, Electrical, Aerospace Quality.
• ASACERT UK · aerospace-wire specification conformance certificate.