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Composite Brake Pads for Railway Passenger Coaches-Technical Specifications

Material Composition&Structure

Friction Material:

Matrix:Thermoset phenolic resin(15-25%)

Reinforcements:

?Aramid fibers(10-15%)

?Glass fibers(8-12%)

Friction modifiers:

?Graphite(5-8%)

?Antimony trisulfide(3-5%)

Fillers:

?Alumina(15-20%)

?Calcium carbonate(10-15%)

Backing Plate:

?Material:S355JR high-strength steel

?Thickness:6-8mm

?Surface treatment:Zinc-aluminum coating(50μm)

Design Features

Standard dimensions:200×80×30mm(typical)

Surface geometry:

?Cross-drilled cooling holes(?5mm)

?Laser-cut grooves(depth 2mm,width 3mm)

?Chamfered edges(45°)

Working Principle

When braking is initiated:

Hydraulic pressure(15-20MPa)activates caliper

Pads contact disc at 0.8-1.2N/mm2pressure

Kinetic energy converts to heat(peak 400-600°C)

Friction coefficient maintains 0.38±0.03

Technical Advantages

|Characteristic|Performance Data|

|Friction Stability|μvariation<5%(50-350km/h)|

|Wear Resistance|≤0.08cm3/MJ(UIC 541-5)|

|Noise Level|<72dB(A)80km/h|

|Environmental|Asbestos-free,RoHS compliant|

|Weight Saving|40%lighter vs cast iron|

Maintenance Protocol

Inspection:

Visual check every 10,000km

Thickness measurement(minimum 5mm)

Thermal imaging for hot spots

Replacement:

Standard interval:80,000-120,000km

Must use matched pairs(LR/HR)

Installation:

Clean mounting surface(Sa2.5)

Apply copper-free antiseize compound

Torque bolts to 85±5Nm

Certification&Standards

EN 14535-1:2015(Railway applications)

UIC 541-4 Brake performance

ISO 26865:2013 Noise testing

Note:Optimal performance requires:

Proper bedding-in(200-300 brake applications)

Compatible brake disc material(EN 15663)

Regular brake fluid replacement(DOT 4+)

Current technical evolution includes:

Embedded RFID chips for wear monitoring

Graphene-enhanced friction materials

Self-diagnosing sensor pads(IoT enabled)