Product Overview

FeNi50 iron-nickel fixed expansion precision alloy, produced by Qinchuan New Materials (Zhengzhou) Co., Ltd., is a high-purity fixed expansion precision seal alloy in the iron-nickel series. The alloy is precisely formulated and melted to form a stable single austenitic structure. The FeNi50 alloy features an ultra-low thermal expansion coefficient, achieving precise thermal expansion matching with soft glass and alumina ceramics, effectively resolving industry challenges such as cracking, micro-leakage, and failure of metal-to-glass/ ceramic seals under temperature alternating conditions.

Main Product Features

• Precise determination of expansion characteristics, excellent sealing and mating suitability
• Highly stable organization, excellent airtight performance
• Mechanical properties balanced, excellent precision machining performance
• Wide applicability in welding and process compatibility, strong mass production stability

Product Detailed Parameters

Application Scope

FeNi50 iron-nickel precision alloy with definite expansion is widely used in the following fields:

• Electro-vacuum Device Sealing Component
• Semiconductor and Microelectronics Packaging
• Aerospace Precision Instruments
• High-end precision instruments and equipment
• Special industrial airtight equipment

Frequently Asked Questions (FAQ)

• Q: What is the coefficient of thermal expansion for FeNi50 alloy?

  A: The thermal expansion coefficient of FeNi50 alloy is 9.2–10.0×10⁻⁶/℃ from 20 to 300℃, and 9.2–9.9×10⁻⁶/℃ from 20 to 400℃.

• A: What application fields are suitable for FeNi50 alloy?

  A: FeNi50 alloy is suitable for a wide range of applications, including electrical vacuum devices, semiconductor packaging, precision instruments for aerospace, and high-end sealed components.

• A: How are the welding properties of FeNi50 alloy?

  A: The welding process performance of FeNi50 alloy is excellent, enabling various welding techniques such as brazing, spot welding, and TIG welding.