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China Power Brake Sales and Supply for High-Speed Train Brake Pads
Key Engineering Insights
- Thermal Shock Resistance: Formulated to maintain a stable friction coefficient under extreme thermal loads during emergency braking at 350 km/h.
- Field-Proven Compliance: Meets and exceeds TJ/CL 307-2019 standards and CRCC-09W-014:2019 certifications.
- Optimized Wear Rate: Low specific wear rate (0.142 cm³/MJ) extends service life and reduces maintenance overhead for global operators.
When operating a high-speed EMU train at velocity exceeding 300 to 350 km/h, the kinetic energy that must be dissipated during deceleration is immense. The entire safety of passengers relies on the friction interaction between the brake disc and the brake pad. In modern high-speed railway networks, powder metallurgy brake pads are critical safety components that must withstand aggressive mechanical strain, sudden thermal shocks, and adverse environmental conditions.
In actual high-speed revenue service—such as on China's CR400AF and CR400BF Fuxing trainsets—brake pads experience surface temperatures rapidly spiking over 350°C. Maintaining a predictable, fade-free friction coefficient across dry, wet, and dragged braking modes is essential. A sudden drop in friction coefficient at high speeds significantly extends braking distance, posing severe operational risks.
railway parts
To evaluate the mechanical and thermal performance of the PRF1110 (Dovetail Type I-C) powder metallurgy brake pad, dynamic full-scale tests were conducted at the CRCC Railway Components Inspection Station (Changzhou) Co., Ltd. utilizing the ZJZ (JP) 190 1:1 Full-Scale Brake Dynamometer. The testing program followed strict criteria outlined in the TJ/CL 307-2019 Interim Technical Conditions for EMU Brake Pads.
The following experimental data summarizes full-scale dynamometer test results across multiple operating speeds and clamping forces. Key parameters have been slightly adjusted to preserve proprietary formulations while strictly demonstrating full compliance with national railway standards.
| Test Condition | Initial Speed | Clamping Force | Mean Friction ($\mu_{mean}$) | Braking Distance | Peak Disc Temp | Standard Compliance |
|---|---|---|---|---|---|---|
| Dry High-Speed Stop | 350 km/h | 23 kN | 0.382 | 3,820 m | 385 °C | Pass (TJ/CL 307-2019) |
| Dry Standard Stop | 250 km/h | 23 kN | 0.388 | 2,640 m | 338 °C | Pass (<5% fluctuation) |
| Heavy Pressure Emergency | 250 km/h | 32 kN | 0.375 | 1,930 m | 362 °C | Pass (No Thermal Fade) |
| Wet Condition Stop | 200 km/h | 23 kN | 0.341 | 1,885 m | 235 °C | Pass (Requirement ≥ 0.250) |
| Continuous Drag Braking | 80 km/h (20 min) | 30 kW Const. | 0.428 (Avg) | N/A | 358 °C | Pass (Min/Max Within Range) |
| Static Friction (Hot/Cold) | 0 km/h (Static) | 63 kN | 0.468 / 0.485 | N/A | N/A | Pass (Requirement ≥ 0.350) |
| Specific Wear Rate | Full Sequence | Standard Pressure | 0.142 cm³/MJ | N/A | N/A | Pass (Limit ≤ 0.35 cm³/MJ) |
'During 1:1 full-scale dynamometer evaluation in Changzhou, the PRF1110 brake pad demonstrated exceptional thermal stability. From initial velocities of 50 km/h up to 350 km/h, friction attenuation was minimal, while specific wear was held at 0.142 cm³/MJ—significantly superior to the 0.35 cm³/MJ standard threshold. Furthermore, post-test inspection following IEC 61373 Category 2 shock and vibration sequences showed zero micro-cracking, debonding, or mechanical backing plate separation.'
Modern fast train systems require components engineered to brake train sets with absolute predictability. By balancing copper-based metallic matrices with specialized lubricant and friction-modifying ceramic phases, Puranrail ensures optimal power brake sales and supply for high-speed networks worldwide.
Frequently Asked Questions (FAQ)
1. Why are high-speed train brake pads so critical in railway operations?
At operational speeds of 350 km/h, high-speed trains carry tremendous kinetic energy. Brake pads are the primary component responsible for transforming this energy into heat during stopping. They must withstand extreme thermal shocks above 350°C to 500°C without thermal fading or structural disintegration, making them vital for overall train safety.
2. Why are Puranrail powder metallurgy brake pads so stable?
Puranrail utilizes a proprietary matrix featuring high thermal conductivity and balanced self-lubricating graphite phases. Combined with a multi-block flexible backplate structure (Dovetail Type I-C), our brake pads maintain uniform contact with the brake disc even during intense thermal expansion, eliminating friction fluctuation and vibration.
3. Why can Puranrail supply high-performance brake pads to global customers?
China operates the world's largest 350 km/h high-speed rail network spanning extreme climates from -40°C arctic freezing to 45°C high-temp desert environments. Puranrail's products are field-proven across millions of kilometers of revenue service, backed by scalable manufacturing and robust quality control.
4. Does Puranrail possess complete Chinese Railway CRCC certification?
Yes, Puranrail holds complete CRCC certification across multiple speed ratings (200-250 km/h and 300-350 km/h) and structural types (Dovetail Type I-A, I-B, I-C), making them fully compatible with Fuxing CR400AF/BF, Harmony CRH series, and international standard gauge high-speed trains.
5. Can Puranrail produce customized brake pads for global high-speed railways?
Absolutely. We engineer customized friction formulations, backplate mounting geometry, and specialized thermal dissipation profiles based on global client axle loads, maximum braking speeds, and environmental requirements.
