Classification of Tungsten Alloy Fasteners (Part Two)

Tungsten alloy fasteners, owing to their excellent physicochemical properties, are designed as specialized connectors to meet the demands of specific working conditions. Based on functional requirements, the classification of these components falls into three major categories—high-temperature resistance, corrosion resistance, and high precision—and each category has been optimized through special processes to adapt to extreme environments and high-reliability scenarios.

I. High-Temperature Resistant Tungsten Alloy Fasteners

High-temperature resistant tungsten alloy fasteners are specifically designed for ultra-high-temperature conditions, with process optimization helping maintain performance stability under significant thermal stress.

Coating-Reinforced Fasteners: These feature a surface application of ceramic or intermetallic compound coatings to enhance anti-oxidation and heat resistance, suitable for component connections in aviation engine combustion chambers or high-temperature metallurgical furnaces. The coating process requires careful control of thickness to effectively isolate high-temperature oxidation while reducing the risk of peeling due to excessive thickness, thereby creating conditions for long-term stability.

Composition-Optimized Fasteners: By doping with high-melting-point elements (such as rhenium or tantalum), these fasteners improve the alloy's high-temperature strength and creep resistance. They perform exceptionally in the fixation of nuclear reactor control rods or connections in high-temperature gas turbines, capable of withstanding sustained thermal loads, reducing deformation and fatigue failure, and thus supporting the reliable operation of critical components.

II. Corrosion-Resistant Tungsten Alloy Fasteners

Corrosion-resistant tungsten alloy fasteners are designed for acidic, alkaline, or salt spray corrosive environments, with surface treatments enhancing corrosion resistance:

Surface-Passivated Fasteners: Through chemical treatment, a dense oxide protective layer is formed, boosting resistance to strong acids and alkalis, making them suitable for chemical equipment applications. This treatment not only enhances corrosion resistance but also helps maintain the mechanical strength of tungsten alloys, providing support for long-term stability of connectors in harsh chemical environments.

Composite-Coated Fasteners: Featuring surface plating with corrosion-resistant alloys (such as nickel-based or chromium-based coatings), these form a multi-layer protective system combined with the excellent chemical stability of tungsten alloys, ideal for marine engineering applications.

III. High-Precision Tungsten Alloy Fasteners

High-precision tungsten alloy fasteners are tailored for scenarios with stringent dimensional and performance requirements, supporting the needs of precision instruments and high-end manufacturing:

Ultra-Precision Screws: With thread and shank dimensional tolerances controlled at the micron level, these are suitable for fixing reticle plates in semiconductor photolithography equipment, helping ensure positioning accuracy in wafer processing.

Lightweight High-Precision Bolts: Designed with hollow or irregular structures to reduce weight while maintaining strength, this feature makes them ideal for lightweight components in spacecraft, such as satellite antenna bracket connections. Bolts require non-destructive testing to confirm internal structural integrity, reducing the risk of failure due to micro-defects in vacuum or high-pressure environments.

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