Laser Cutting Technology for Thermoplastic Carbon Fiber Composites-ShangHai RunQia Electronics Technology Co.,Ltd.

Laser Cutting Technology for Thermoplastic Carbon Fiber Composites

In the field of advanced manufacturing, the adoption of 2μm band lasers (typically thulium-doped fiber lasers) for cutting thermoplastic carbon fiber composites (TP-CFRP) is emerging as a groundbreaking technical solution.

I. Technical Principle: Why Choose 2μm Fiber Lasers

Traditional 1μm lasers (such as ytterbium-doped fiber lasers) face challenges in processing carbon fiber materials, with the core contradiction lying in the difference in component absorption rates.

1. Differential Absorption Effect

Carbon fiber composites consist of carbon fibers and a resin matrix (thermoplastics such as PEEK, PPS, and PA6):

1)Carbon fiber: Extremely high absorptivity for lasers of all wavelength bands.

2)Thermoplastic resin: Almost transparent to 1μm lasers (ultra-low absorptivity), yet features a prominent absorption peak for 2μm lasers. This is because the 2μm wavelength better matches the vibrational energy levels of C-H and O-H molecular bonds in polymers.

2. Heat-Affected Zone (HAZ) Control

During 1μm laser cutting, energy is almost entirely absorbed by carbon fibers, and heat is then transferred to the resin via conduction. This causes overheating and scorching of fibers, while insufficient resin absorption leads to extensive matrix recession or delamination.

The 2μm laser achieves synchronous ablation: both fibers and resin absorb energy simultaneously. As the resin can directly capture photon energy, the heat conduction time during cutting is shortened, significantly reducing the heat-affected zone (HAZ).

3. Special Behavior of Thermoplastic Materials

Unlike non-meltable thermoset carbon fiber composites, thermoplastic carbon fiber materials melt when heated. The precise heat input of the 2μm laser enables:

Automatic section edge sealing: Molten resin re-coats fibers at the cutting edge, preventing fiber exposure and burring.

High-efficiency sublimation: The high power density of the laser instantaneously vaporizes the material, reducing the accumulation of molten residue.

II. Comparative Technical Advantages

III. Market Application Scenarios

With the further upgrading of lightweight and sustainable development requirements in 2026, this technology holds great potential in the following fields:

1. Aerospace (Secondary Load-Bearing Parts & Interior Components)

Thanks to recyclability and impact resistance, TP-CFRP is widely applied to brackets, access panels and cabin seat frames of civil aircraft. The 2μm laser meets the stringent aviation standards for edge strength and delamination control.

2. New Energy Vehicles (High-Performance Components)

2.1Battery pack housings: Leveraging the impact resistance and flame retardancy of thermoplastic composites, laser cutting delivers high-precision assembly holes and edge trimming.

2.2Anti-collision beams and chassis reinforcements: In mass production lines, fiber-delivered 2μm lasers are easily integrated into multi-axis robots for flexible processing of complex curved surfaces.

3. Consumer Electronics (High-End Shells)

Ultra-thin and lightweight carbon fiber is increasingly used in high-end laptops and foldable phone frames. The 2μm laser processes ultra-fine micropores and special-shaped edges with a kerf width below 0.1 mm, eliminating the need for subsequent polishing.

4. Hydrogen Energy Industry (Hydrogen Storage Tank Trimming)

In the manufacturing of Type IV/V hydrogen storage tanks (plastic liner + carbon fiber winding), precision trimming is required for composite materials at the tank end. The 2μm laser cuts without damaging the thermoplastic plastic interface of the inner liner, ensuring excellent sealing performance.

5. Medical Devices

Prosthetics and orthotic braces: TP-CFRP features good biocompatibility and plasticity. Custom laser processing enables precise fitting according to patient physical characteristics.

IV. Summary and Prospect

The 2μm fiber laser cutting technology fills the gap of absorption mismatch of traditional lasers in composite material processing. Although the current cost of lasers in this wavelength band is slightly higher than that of general-purpose lasers, with the mass production of domestic thulium-doped fibers and core components, its market penetration in thermoplastic composite proce

Solution