AS9100D Certified
ISO 9001:2015
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US Manufacturing
Aerospace-grade C103 niobium alloy powder (Nb-10Hf-1Ti) engineered for rocket nozzles, thruster components, and extreme-temperature propulsion applications. C103 delivers exceptional strength-to-weight ratio and oxidation resistance at temperatures exceeding 1,400°C, making it the alloy of choice for liquid rocket engine combustion chambers and radiation-cooled nozzle extensions. We supply gas-atomized C103 powder in particle size distributions from 15–45µm for laser additive manufacturing to 45–150µm for PM-HIP near-net-shape consolidation. All C103 powder is American-produced, DFARS compliant, ITAR controlled, and certified under our AS9100D quality system with full heat-lot traceability.
AS9100D Certified
ISO 9001:2015
US Manufacturing
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ITAR-registered, domestic powder production. No export delays. Direct supply to US propulsion programs and defense contractors meeting DFARS requirements.
AS9100D, ISO 9001:2015, and AMS certifications. Full material traceability and compliance documentation for flight programs.
Particle size distribution tailored to your consolidation process—whether vacuum arc remelting, HIP, or additive manufacturing workflows.
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Direct technical collaboration on composition validation, coating strategy, and process qualification. Real sourcing expertise, not marketing.
C103 is the standard refractory for thrust chamber liners and nozzle extensions on next-generation liquid rocket engines. SpaceX, Aerojet Rocketdyne, and advanced hypersonics programs rely on this Nb-10Hf-1Ti composition for its exceptional high-temperature strength and thermal cycling performance. Apollo-era hardware validation continues to drive specification—but today’s thermal models are more aggressive, and silicide coating integration is non-negotiable. We supply the material that closes that gap: composition control tight enough to survive qualification testing, grain structure consistent enough for prediction models, and US origin to eliminate sourcing risk.
AMS 7857 compliance is baseline, not marketing. We control hafnium content to ±0.3%, titanium to ±0.15%, and interstitial levels (O, N, C) with precision. Why this matters: hafnium and titanium segregation drives grain boundary precipitation; loose composition control kills ductility and coating adhesion. Every lot is ASTM E2794 oxygen analysis verified, ASTM E1409 nitrogen checked, and carbon tracked via combustion. X-ray fluorescence validates major elements pre-consolidation. Your thrust chamber design loads don’t forgive batch-to-batch drift—ours don’t produce it.
C103 sourcing is not a commodity play. The supplier base is narrow—globally, single-digit producers of aerospace-grade powder. Lead times stretch. ITAR restrictions lock out many source options. We manage that complexity for you: long-term relationships with refractory powder specialists, advance planning on mill runs, direct insight into capacity constraints across the industry. When your program has a critical procurement on a 6-month schedule, we know where the material lives and how to move it without regulatory friction.
Our team will respond within 24 hours with pricing and availability information.
Nb-10Hf-1Ti (C103) was developed in the 1960s for Apollo-era lunar lander descent engines and remains the primary choice for liquid rocket engine thrust chambers and nozzle extensions. The alloy combines exceptional high-temperature strength (creep rupture strength >100 MPa at 1,900°C), superior thermal fatigue resistance, and reliable manufacturability via vacuum remelting and HIP consolidation. Melting point ~2,350°C allows sustained operation at 2,000–2,100°C with silicide coating protection. Hafnium (10%) strengthens grain boundaries and suppresses recrystallization; titanium (1%) refines grain structure and improves workability. Today, C103 remains the baseline for SpaceX Merlin and Raptor family engines, Aerojet Rocketdyne RS-25 and LEO thermal designs, and Blue Origin BE-4 variants. The alloy is also under active qualification for advanced hypersonic vehicle leading edges and control surfaces, where thermal cycling and oxidation resistance (particularly with R512E silicide coating) drive material selection. Its proven track record, absence of brittle-phase precipitation in the operating window, and predictable degradation kinetics under thermal cycling make it irreplaceable in the current vendor ecosystem.
C103 is AMS 7857 defined—but specification compliance alone does not guarantee program success. Hafnium content (target 10±0.3%) directly controls grain boundary coverage and beta-phase precipitation temperature; deviation above 10.5% introduces brittle Hf-Nb compounds; below 9.5% leaves grain boundaries unprotected. Titanium (target 1±0.15%) must stay within band to prevent excessive alpha-stabilization or loss of ductility. Interstitial elements (oxygen <150 ppm, nitrogen <100 ppm, carbon <50 ppm) are critical—elevated oxygen promotes secondary-phase formation and coating delamination under thermal cycling; excess nitrogen embrittles as Nb-nitride platelets. Every powder lot requires ASTM E2794 oxygen analysis, ASTM E1409 nitrogen determination, and combustion analysis for carbon. X-ray fluorescence validates major element composition pre-consolidation; scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM-EDS) confirms absence of hafnium segregation in consolidated ingots. Additive manufacturing (laser powder bed fusion, electron beam melting) qualification of C103 is emerging but remains limited—composition tolerance windows are tighter, recrystallization kinetics are less forgiving, and coating applicability post-AM is still being validated. Traditional vacuum remelting and HIP consolidation remain the proven path for thrust chamber applications.
C103 powder is not a catalog item. Global production is concentrated in 3–4 certified suppliers; US-origin domestic production is even more constrained. Lead times typically range 12–16 weeks from order to delivery; emergency sourcing can stretch timelines further. ITAR classification restricts export and limits supply chain flexibility—material produced in the US cannot legally serve non-US propulsion programs without State Department authorization, and overseas sourcing for US defense contracts is prohibited. This creates real scheduling pressure: programs cannot wait for foreign capacity without triggering DFARS non-compliance and supplier vetting delays. MetalPowderSupply holds strategic relationships across the refractory powder base and maintains visibility into mill schedules and capacity constraints. For programs on critical path—launch vehicle development, hypersonic test articles, advanced propulsion qualification—we manage procurement timing and regulatory requirements so you can hit your casting or consolidation milestones. When hafnium or niobium raw material markets tighten (which they do periodically), sourcing discipline separates on-schedule deliveries from program delays. Domestic, ITAR-compliant C103 powder is not abundant. Plan accordingly.
Ready to discuss your C103 alloy requirements? Our team provides fast RFQ turnaround, technical support, and competitive pricing on all niobium-hafnium alloy forms and specifications. Contact us today.