Introduction

In the high-end manufacturing field, the thermal expansion matching of materials is directly related to the reliability and lifespan of products. Iron-nickel fixed expansion sealant alloys, as a type of special functional material, achieve thermal expansion coefficient matching with non-metallic materials such as glass and ceramics within a specific temperature range through precise control of the nickel content, and have become core materials in fields such as electrical vacuum devices and semiconductor packaging. Qinchuan New Materials (Zhengzhou) Co., Ltd., as an outstanding player in this field, has set a benchmark for the industry with its profound technical accumulation and extensive application experience.

I. Tech Strength of Qinchuan New Materials

Qingchuan New Materials is located in the Zhengzhou High-Tech Industrial Development Zone, featuring modern standard workshops and advanced production lines. It specializes in the research and manufacturing of high-purity metals, special alloys, and related products. The company is equipped with precision processing facilities and comprehensive analytical testing capabilities, ensuring that every stage from raw materials to finished products meets high-quality standards.

In the field of iron-nickel fixed expansion sealing alloys, Qinchuan New Materials has mastered the essence of alloy composition design through continuous technological innovation. Taking the 4J50 alloy as an example, its nickel content is precisely controlled at about 50%, and by adjusting the proportions of other elements, it achieves a stable performance with an average linear expansion coefficient of (9.4~9.8)×10⁻⁶/℃ within the temperature range of 20-400℃, highly matching with molybdenum group soft glass, meeting the requirements for high reliability gas sealing.

Chapter II: Technical Layout and Application Experience

Qinchuan New Materials focuses not only on the research and development of basic materials in the technical layout of iron-nickel fixed expansion sealing alloys, but also pays close attention to the processing technology and application performance of the materials. The company adopts a combined process of vacuum induction melting (VIM) + electroslag remelting (ESR) / vacuum consumable arc remelting (VAR), ensuring the purity and uniformity of the master alloy, providing high-quality basic materials for subsequent processing.

In terms of processing technology, Qinchuan New Materials has accumulated rich experience. For pre-bonding treatment, the company adopts a hydrogen annealing process, maintaining a temperature of 900°C±20°C for 1 hour, effectively eliminating stress and activating the surface, improving the wettability between the alloy and glass. At the same time, the company strictly controls oxidation issues during the processing process, ensuring the quality of the bonding interface through anti-oxidation measures and mild pickling of the oxidation scale.

3. Typical Application Cases

Qinchuan New Materials' iron-nickel fixed expansion sealing alloy finds extensive applications in aerospace, energy and power sectors. For instance, in the aerospace field, the company's 4J50 alloy is widely used in the electrode leads and metal-ceramic seals of microwave tubes such as traveling wave tubes, magnetron tubes, and klystrons, as well as in high-insulation and long-term gas-tightness components like vacuum capacitors and relays. These applications demand not only a high thermal expansion coefficient matching with glass but also the maintenance of structural integrity and sealing performance under extreme temperature variations. The alloy products from Qingchuan New Materials perfectly meet these requirements.

In the field of energy and power, Qinchuan New Materials' alloy products also play a significant role. For example, in the sealing of heavy-duty gas turbine blades, the company has effectively improved the durability and reliability of the blades through an integrated solution of heat-resistant and corrosion-resistant coatings with the matrix material, providing a strong guarantee for the efficient operation of energy equipment.

Four, Conclusion

Qinchuan New Materials has achieved remarkable success in the field of iron-nickel fixed expansion sealing alloys, thanks to its profound technical accumulation, extensive application experience, and continuous innovative spirit. The company not only provides high-quality products to the industry but also promotes the progress and development of the entire industry through technical exchanges and cooperation. In the future, Qingchuan New Materials will continue to adhere to the philosophy of "technology-driven, quality-oriented" to offer more high-quality and reliable special alloy material solutions for the high-end manufacturing field.