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Applications of CB752 in Aviation Fuel System Components – Superior Corrosion and Wear Resistance Compared to Pure Metals

Aerospace fuel systems are the "energy transmission pipelines" of aircraft, responsible for the storage, transportation, and distribution of fuel. Their components are in constant contact with corrosive media such as aviation fuel and hydraulic oil, while also enduring high and low temperature cycles (-55℃ to 120℃), vibration, and pressure shocks. This places stringent requirements on the corrosion resistance, wear resistance, fatigue resistance, and sealing performance of materials. While pure metals, as traditional materials for fuel system components, possess certain mechanical strength and processing properties, they have significant shortcomings in corrosion resistance and wear resistance. Long-term use can easily lead to corrosion, wear, and leakage, affecting the normal operation of the fuel system and even causing safety hazards. CB752, with its superior corrosion resistance, wear resistance, and comprehensive mechanical properties, is gradually replacing pure metals and becoming the preferred material for aviation fuel system components, opening up a niche trading market for aviation fuel materials for metal trading companies.

The shortcomings of pure metals in aviation fuel system component applications, particularly in corrosion resistance and wear resistance, are particularly prominent, making it difficult to meet the requirements for long-term stable service. Pure steel is a common material for fuel system pipes, valves, and other components due to its high strength, good sealing performance, and low procurement cost. However, pure steel has extremely poor corrosion resistance. In media such as aviation fuel and hydraulic oil, it is prone to electrochemical and chemical corrosion, leading to wear and thinning of the inner walls of components, and even leakage. This necessitates frequent component replacement, increasing aviation maintenance costs. Furthermore, pure steel has moderate wear resistance; under long-term exposure to fuel erosion and component friction, it is prone to wear, affecting component sealing performance and service life. Therefore, it can only be used for low-end auxiliary components in fuel systems, resulting in very low trade added value.

Pure copper possesses good thermal conductivity and sealing properties, making it suitable for fuel system pipe joints, valve cores, and other components. However, pure copper lacks sufficient corrosion resistance and is prone to corrosion in aviation fuel, forming corrosion products such as verdigris. This not only affects fuel purity but also leads to component wear and failure. Additionally, pure copper has poor wear resistance; under long-term exposure to friction and fuel erosion, it is prone to wear, leading to decreased sealing performance and fuel leakage. Therefore, it can only be used for small, low-pressure fuel system components, limiting its trade applications.

Pure aluminum has a low density and good machinability, making it suitable for lightweight components such as fuel tank shells in fuel systems. However, it lacks strength, has poor wear resistance, and only moderate corrosion resistance; its surface oxide film is prone to peeling off, and it easily corrodes in fuel media. It cannot withstand the pressure shocks of fuel systems and is only suitable for low-load, non-corrosive auxiliary components. Pure titanium has excellent corrosion resistance and can be used for core components in fuel systems. However, its poor wear resistance makes it prone to wear under long-term fuel erosion and component friction. Furthermore, its high processing cost, with a purchase price far exceeding that of pure steel, pure aluminum, and pure copper, hinders large-scale application. Pure niobium has good corrosion resistance but poor wear resistance and fatigue resistance. It is prone to oxidation at high temperatures, requiring additional protective measures and increasing usage costs, thus limiting its trade competitiveness. Pure tungsten and pure molybdenum are brittle and difficult to process, making it impossible to manufacture complex-shaped fuel system components; they are only suitable for niche precision accessories.

Compared to various pure metals, CB752, through the synergistic effect of multiple alloying elements, achieves comprehensive optimization of corrosion resistance, wear resistance, fatigue resistance, and strength. It is perfectly suited to the harsh operating conditions of aviation fuel system components, and its core advantages far surpass those of pure metals, making it the preferred material for downstream aviation manufacturing companies. In terms of corrosion resistance, CB752, with high-purity niobium as its matrix, inherits the excellent corrosion resistance properties of pure niobium. It exhibits extremely strong resistance to corrosive media such as aviation fuel, hydraulic oil, atmospheric humidity, and salt spray. Actual test data shows that after immersing CB752 in aviation fuel for 30 days, there was no obvious corrosion or discoloration on the surface, and the component strength did not decrease significantly. In contrast, pure steel and pure copper corroded and rusted rapidly under the same conditions, and pure aluminum showed oxidation and flaking.

Furthermore, the zirconium element in CB752 can form a dense oxide film on the material surface. Combined with a silicon-based protective coating, this further enhances corrosion resistance, effectively resisting the erosion of fuel media and high-temperature environments, preventing corrosion and wear of components, and significantly extending the service life of components. In terms of wear resistance, the tungsten in CB752 has high hardness, which significantly improves the alloy's wear resistance. Its annealed hardness is 130-160 HV, and in the cold-rolled state it reaches 230-260 HV. After siliconizing treatment, the hardness jumps to 850-1050 HV. Its wear rate is only 1/3 that of pure niobium, 1/2 that of pure titanium, 1/3 that of pure steel, and 1/4 that of pure aluminum. This effectively reduces wear caused by fuel scouring and component friction, preventing seal failure and fuel leakage due to wear, and improving the reliability of the fuel system.

In terms of fatigue resistance and strength, CB752 also has significant advantages. The room temperature annealed tensile strength of CB752 is ≥420 MPa, capable of withstanding the pressure impact of the fuel system and ensuring the structural stability of components. Its excellent fatigue resistance, with fatigue life more than 45% higher than pure titanium and more than 60% higher than pure steel, allows it to withstand long-term high and low temperature cycles and vibration loads, reducing component replacement frequency and lowering aviation maintenance costs. Furthermore, CB752 possesses excellent machinability, allowing it to be manufactured into various fuel system components such as fuel lines, fuel nozzles, valves, and fuel tank connectors through conventional processes like forging, rolling, and machining. It boasts high machining precision and excellent sealing, requiring no complex specialized equipment, and its processing cost is more than 35% lower than that of pure titanium or pure tungsten, significantly reducing production costs for downstream manufacturers.

Currently, CB752 is widely used in the fuel systems of high-end fighter jets and civilian airliners, including core components such as fuel lines, fuel nozzles, valves, and fuel tank connectors. Its reliability and stability have been proven through long-term flight testing, its service life is 3-5 times longer than pure metal components, and maintenance costs are reduced by more than 45%, making it a necessity for downstream aerospace manufacturers. For metal trading companies, the application of CB752 in the aviation fuel system field not only broadens their trading application scenarios but also leverages its high added value and high reliability to meet the fuel system procurement needs of aerospace manufacturers, optimize their trading product portfolio, escape the predicament of homogeneous competition in the low-to-mid-end pure metal market, and achieve diversified and high-end development of their trading business.

AlloyHit specializes in producing CB752 products in various specifications, such as CB752 Sheets, CB752 Rods, CB752 Wires and CB752 Tubes.