High-Speed EMU(300-350km/h&350km/h+)Non-Dovetail Powder Metallurgy Brake Pads-Technical Specifications

1.Product Overview

Application:Designed for high-speed EMUs(Electric Multiple Units)operating at 300-350km/h and above(e.g.,CR400"Fuxing"series,Shinkansen E5/E6).

Mounting Type:Non-dovetail(flat-back)design,compatible with knuckle-type brake calipers(e.g.,Knorr-Bremse KB-15).

Material:Powder metallurgy(PM)friction material,sintered under high pressure/temperature for superior thermal stability.

2.Key Performance Data

Parameter Specification Test Standard

Friction Coefficient(μ)0.28–0.35(stable at 550°C)UIC 541-5

Max Operating Temp 750°C(instant 900°C)EN 14535-2

Wear Rate≤0.05 cm3/MJ JIS E 4307

Shear Strength≥40 MPa ISO 6312

3.Material Technology

Base Composition:

Copper-based matrix(60-70%)+Iron powder(15-20%)

Lubricants:Graphite(5-8%)+MoS?(2-3%)

Reinforcements:Silicon carbide(SiC,3-5%)

Sintering Process:Hot-pressed at 850–950°C under 25–30MPa.

Advantages vs.Traditional Pads:

?30%higher thermal conductivity(reduced heat cracking)

?15%longer service life(avg.150,000–200,000 km)

?Noise reduction(<75 dB at 300km/h)

4.Structural Design

Flat-back interface:Eliminates dovetail stress concentrations,improving fatigue resistance.

Asymmetric slots:Laser-cut cooling grooves reduce thermal deformation.

Integrated wear sensor:RFID-enabled for real-time thickness monitoring.

5.Maintenance&Certification

Replacement Threshold:

Minimum thickness:10mm(new)→5mm(replacement limit)

Cracks:Depth>2mm or length>15mm requires immediate replacement.

Certifications:

China:CRCC Certification(Q/CR 546-2016)

Europe:TSI 1302/2014(Interoperability)

Japan:JIS E 4307(Shinkansen compliance)

6.Comparative Analysis

Feature Non-Dovetail PM Pads Traditional Dovetail Pads

Heat Dissipation Superior(copper matrix)Moderate(organic composite)

Installation Faster(bolt-on)Requires dovetail machining

Cost 20–30%higher Lower initial cost

Note:Compatible with ventilated brake discs(e.g.,forged steel,32–36mm thickness).

For extreme cold climates(–40°C),low-temperature pre-sintered variants are available(friction coefficient stabilized at±5%variance).

Data based on OEM specifications from CRRC,Knorr-Bremse,and Hitachi Rail.Actual performance may vary by operating conditions.