The Innovation Path of CJL Technology in Single-Piece Samarium–Cobalt Magnet Manufacturing
In the high-end segment of the permanent magnet industry, the R&D and production of large-size, high-performance samarium–cobalt (SmCo) magnets have long been constrained by substantial technical barriers, becoming a bottleneck that limits upgrades in many advanced equipment systems. CJL Technology, dedicated to the development and manufacturing of single-piece (monolithic) SmCo magnets, has broken through the core technologies required for large-size fabrication through independent innovation. Today, CJL is among the very few companies worldwide capable of mass-producing ultra-large, single-piece SmCo magnets, redefining industry standards and driving multi-sector development through precise strategic positioning.
Breakthrough in Single-Piece Molding Technology
SmCo magnets, known for their exceptional high-temperature stability and magnetic properties, are ideal for extreme-environment applications. However, as magnet dimensions increase, the requirements for material formulation, molding pressure, and magnetic-field control rise exponentially. Historically, global mass production of single-piece SmCo magnets was limited to small sizes. Large-size products frequently suffered from cracking, internal stress issues, and uneven magnetic performance, leading to stagnation in technical progress. CJL has now successfully resolved these long-standing challenges.
After years of intensive development, CJL has established unique technological barriers in single-piece SmCo magnet manufacturing, achieving global-leading parameters and exclusive supply capabilities:
- Single-piece dimension along the magnetization direction: 100–200 mm
- Single-piece dimension perpendicular to the magnetization direction: 100–300 mm
- Individual magnet weight: no less than 15 kg
These breakthroughs overturn the long-held belief that “SmCo magnets cannot be made large in one piece.”
Despite the significant size increase, the magnets maintain outstanding performance: intrinsic coercivity Hcj ≥ 25 kOe, knee-point coercivity Hk ≥ 16 kOe, and stable long-term operation at 350–550°C. This rare combination of large size + high performance, all achieved in a single non-spliced structure, positions CJL as a global leader in large single-piece SmCo magnets.
CJL’s hardened capability is supported by full-chain mastery—spanning materials research, process design, manufacturing, and final testing. This complete system allows large single-piece magnets to transition from laboratory prototypes to true mass production, marking a major milestone in CJL’s development.
Large Single-Piece Advantages Enable Multi-Sector Applications
CJL’s single-piece large SmCo magnets—combining ultra-large dimensions, high-temperature resistance, and strong magnetic performance—perfectly match the needs of many high-end industries. They enable equipment designs that were previously impossible due to size and assembly limitations, injecting new momentum into industrial upgrading.
Aerospace:
Critical components such as satellite attitude-control systems and missile guidance units must endure extreme space temperature cycles while requiring strict dimensional stability. CJL’s single-piece SmCo magnets eliminate splicing, avoiding magnetic inconsistencies and reliability risks inherent in assembled magnets. With 550°C thermal resistance and 25 kOe coercivity, they are ideal for harsh aerospace operating conditions.
New energy & industrial equipment:
In 800V EV traction motors, large single-piece magnets increase motor power density, reduce assembly parts, and enable more compact, efficient structures. In wind turbines, the magnets’ >350°C thermal resistance addresses high-temperature challenges and extends service intervals. In petrochemical and metallurgical equipment, their ability to operate stably in harsh environments lowers maintenance costs and enhances operational efficiency.
Medical & precision sensing:
MRI systems require large, highly uniform magnetic fields. CJL’s single-piece (non-assembled) SmCo magnets avoid field discontinuities caused by splicing, while Hk ≥ 16 kOe improves imaging accuracy. In high-precision magnetic sensors, stable magnetic-field output ensures reliable measurement, supporting advancements in medical diagnostics and industrial inspection.
Continuous Innovation Drives Long-Term Growth
As a pioneer in large single-piece SmCo magnet manufacturing, CJL follows the principle of “technological innovation drives industry progress.” Its R&D team—composed of specialists in rare-earth materials and powder metallurgy—has established a full-chain innovation system, overcoming dozens of technical challenges including large-mold design and sintering stress control, and securing multiple core invention patents.
While ensuring technological leadership, CJL places equal emphasis on quality. Every single magnet undergoes stringent testing—covering magnetic performance, thermal resistance, dimensional precision, and more—to meet high-specification requirements.
With its innovation-driven and quality-focused development model, CJL continues to break through technical barriers and make steady progress in R&D. Looking ahead, the company will remain market-oriented, deepen its presence in the permanent-magnet industry, and explore optimized technologies and broader application scenarios.
