Introduction

In the field of high-end equipment manufacturing, iron-nickel controlled expansion precision alloy, as a key material, directly determines the reliability and service life of the equipment. Leveraging its profound R&D expertise and advanced manufacturing processes, Qingchuan New Materials (Zhengzhou) Co., Ltd. has achieved technological breakthroughs in the field of iron-nickel controlled expansion alloys, providing high-performance material solutions for industries such as aerospace and energy power.

Technical strength: Full-chain innovation ranging from composition design to process control

The technical team of Qingchuan New Materials has developed a series of iron-nickel controlled expansion alloys, such as 4J42 and 4J44, by precisely controlling alloy compositions. Their coefficient of thermal expansion (CTE) can be stably controlled within the range of 5.5-11.2×10⁻⁶/℃ from 20 to 400℃, enabling precise matching with specific glass or ceramic substrates. For instance, by optimizing the nickel content (44.5%-45.5%), the 4J44 alloy maintains excellent oxidation resistance and mechanical strength even at 900℃, with a tensile strength of ≥600 MPa, a yield strength of ≥380 MPa, and an elongation of ≥25%, meeting the long-term usage requirements under extreme operating conditions.

In terms of process control, Qingchuan employs a combined process of Vacuum Induction Melting (VIM) + Electroslag Remelting (ESR) to ensure the purity and compositional uniformity of the master alloy. For high-end applications, its directional solidification and single-crystal technologies enable a high yield rate of blade-grade castings, while the Hot Isostatic Pressing (HIP) technology effectively eliminates microshrinkage, allowing the alloy to maintain excellent ductility and fatigue performance after long-term aging. For instance, through a solution + aging heat treatment regime, the size of the γ' strengthening phase in K418 alloy is controlled at the nanoscale, resulting in an over 30% increase in endurance strength at 1000°C.

Technology Layout: Deep Integration from Materials to Solutions

Qingchuan New Materials does not merely supply materials but builds core competitive barriers through a "materials + processes + solutions" model. Its product matrix covers equiaxed crystals (K418/K419), directional/single-crystal alloys, and a full range from solution strengthening to age strengthening, directly aligned with international standards (e.g., Inconel 713C corresponding to K418). For instance, in the field of aviation turbine blades, Qingchuan's K418 alloy, through investment casting technology, enables the direct molding of hollow blades with complex internal cooling channels. Compared to forging processes, this achieves a 15% improvement in thermal efficiency and a 10% increase in thrust-to-weight ratio.

For the energy and power sector, Qingchuan has developed an integrated solution combining heat-resistant and corrosion-resistant coatings with substrate materials. For instance, in heavy-duty gas turbine blades, its specialized alloy enhances sulfuration and chloride ion corrosion resistance by 50% at 650°C, extending service life to over 20,000 hours. In the automotive industry, the K418 alloy is mass-applied in turbocharger impellers, enabling stable, large-scale, and cost-effective supply through precision casting capabilities, reducing costs by over 30% and shortening delivery cycles by 40%.

Application Experience: Successful Practice from Laboratory to Industrialization

Qingchuan New Materials' technological achievements have been widely applied in multiple fields. In the aerospace sector, its 4J42 alloy is used to manufacture encapsulation housings for electrical vacuum devices such as microwave tubes and magnetrons. Through pre-oxidation treatment, a dark blue-gray oxide film of 3-7 μm is formed, enabling hermetic sealing with glass and achieving a gas leakage rate below 1×10⁻¹⁰ Pa·m³/s. In the semiconductor packaging field, the 4J45 alloy serves as a critical sealing pin for ceramic or glass packaging of devices like crystal oscillators and integrated circuits. During thermal cycling tests from -55°C to 150°C, the packaged components exhibit no cracking, with reliability improved by 200%.

Taking a certain aero-engine project as an example, the K419 single-crystal turbine blades produced by Qingchuan through directional solidification technology achieved a lasting strength of 400 MPa at a high temperature of 1050°C, with creep resistance 15% superior to that of imported materials, successfully replacing imports and achieving a breakthrough in localization. In a certain land-based gas turbine project, its heat-resistant corrosion coating technology extended the blade lifespan from 8,000 hours to 15,000 hours, reducing maintenance costs by 40%.

Conclusion

Qingchuan New Materials (Zhengzhou) Co., Ltd. has propelled iron-nickel constant expansion precision alloy from laboratory research to industrial application through continuous technological innovation and full-chain quality control. Its "materials + processes + solutions" model not only addresses the reliance of high-end equipment on imported materials but also provides the industry with cost-effective and highly reliable material options by leveraging in-depth process know-how and the advantages of a localized supply chain. In the future, Qingchuan will continue to delve deeper into the field of superalloys, driving materials science toward higher performance and greener development.