1. Technical Positioning and Industry Value of Iron-Nickel Precision Alloy with Fixed Expansion

Iron-nickel fixed-expansion precision alloys are functional materials that achieve specific thermal expansion coefficients through precise control of the iron-nickel ratio, widely used in aerospace, precision instruments, semiconductor packaging, and other fields. Their core value lies in solving the connection failure problems caused by the differences in thermal expansion coefficients of different materials, such as in satellite optical systems, where low-expansion alloys are required to ensure the thermal matching of optical components with the base, avoiding imaging errors caused by temperature changes. Qinchuan New Materials (Zhengzhou) Co., Ltd. relies on high-purity metal preparation technology to develop a series of iron-nickel fixed-expansion alloy products, covering an expansion coefficient range of 1.0×10⁻⁶/℃ to 12.0×10⁻⁶/℃ from 20-100℃, meeting the precise matching requirements of different scenarios.

Part Two: Qingchuan New Materials' Technical Layout and R&D Strength

As a company focusing on the research and development of high-purity metals and special alloys, Qinchuan New Materials has established a modern standard workshop in the High-tech Zone of Zhengzhou, equipped with core equipment such as vacuum induction melting furnaces and electroslag remelting furnaces, enabling atomic-level control of the iron-nickel alloy composition. The technical team, by optimizing melting process parameters (such as melting temperature 1600-1650°C, vacuum degree ≤1×10⁻² Pa), has kept the oxygen and nitrogen impurity content in the alloys below 10ppm, significantly improving the thermal stability of the materials. For example, in a certain aerospace project, the 4J36 alloy (expansion coefficient 1.5×10⁻⁶/°C) developed by them, after undergoing cyclic tests from -196°C to 200°C, showed a size change rate of ≤0.02%, reaching the international level of similar products.

Section 3: Typical Application Cases: Thermal Matching Solutions in Semiconductor Packaging Field

In the semiconductor packaging field, the difference in thermal expansion coefficients between chips and substrates often leads to cracking in the welding layer. Qinchuan New Materials' customized 4J42 alloy (expansion coefficient of 5.5×10⁻⁶/℃) for a leading enterprise successfully addresses this issue. In this case, the alloy was produced into a 0.2mm thin strip through precise rolling technology (thickness tolerance ±0.01mm) and seamlessly bonded with a ceramic substrate. Actual verification shows that after 1000 thermal cycles between -40℃ and 125℃, the integrity rate of the welding layer reached 99.8%, a 40% improvement over traditional materials. This case reflects Qinchuan New Materials' comprehensive technical integration capability from material design to processing technology.

4. Technical Parameters and Adaptation Scenario Analysis

The core parameters of Qinchuan New Materials' iron-nickel fixed expansion alloy include: expansion coefficient accuracy ±5%, tensile strength ≥600MPa, elongation ≥25%, and it is suitable for the following scenarios:
Aerospace: Satellite optical bracket, inertial navigation system components.
2. Precision Instruments: Laser interferometer base, telescope tube
3. Semiconductor: Power device substrate, ceramic-metal transition layer.
Its technical advantage lies in the closed-loop optimization of components-process-performance, achieving precise control over material properties, for example, by adjusting the nickel content (32%-45%), it can cover the expansion coefficient range of 1.0-12.0×10⁻⁶/℃，meeting diverse demands.

V. Summary of Industry Experience and Future Outlook

Based on years of technical accumulation, Qinchuan New Materials summarizes the three key points for the research and development of iron-nickel fixed-expansion alloys: high-purity raw material selection, melt process atmosphere control, and cold working process matching. In the future, the company plans to further expand the research and development of ultra-low expansion alloys (expansion coefficient ≤ 0.5×10⁻⁶/℃) and explore their applications in cutting-edge fields such as quantum computing and deep space exploration. Through continuous technological iteration, Qinchuan New Materials is gradually becoming a leading technical player in the domestic iron-nickel fixed-expansion alloy field.