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DU-B
Material Specifications |
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DUB flanged bushes, PTFE lined, BRONZE backing, self lubricating dry bearings
Sintered PTFE and Bronze on Bronze Backing (Maintenance-free Material)
PTFE / Fibre + Bronze + Bronze Backing
Features
Suitable for dry running, low coefficient of friction, lower wear, good sliding characteristics, the transfer film created can protect the mating metal surface, suitable for rotary and oscillating movement. Very high chemical resistance, low absorption of water and swelling, also performs very good lubrication feature, the bronze backing provides the improved corrosion resistance comparing with SBU bearings.
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Structures
1. PTFE/fibre mixture thickness 0.01~0.03mm, provides an excellent initial transfer film, which effectively coats the mating surfaces of the bearing assembly, forming an oxide type solid lubricant film.
2. Sintered bronze powder thickness 0.20-0.35mm, provides max. thermal conductivity away from the bearing surface, also serves as a reservoir for the PTFE/Fibre mixture.
3. Bronze backing, provides exceptionally high load carrying capacity, excellent heat dissipation and very good corrosion resistance.
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Technical Data
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Physical and Mechanical Properties
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Usage
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Thermal Conductivity λ
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60
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W/mK
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dry
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very good
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Maximum Operating Temperature Tmax
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280
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°C
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oil lubricated
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good
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Minimum Operating Temperature Tmin
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-200
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°C
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grease lubricated
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fair
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Compressive Yield Strength σc
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300
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N/mm2
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water lubricated
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good
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Maximum Static Load Psta,max
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140
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N/mm2
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process fluid lubricated
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fair
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Maximum Dynamic Load Pdyn,max
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140
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N/mm2
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Maximum Sliding Speed V-dry
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2.5
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m/s
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Maximum PV Factor-dry, continuous operation
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1.8
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N/mm2 * m/s
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Maximum PV Factor-dry, intermittent operation
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3.5
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N/mm2 * m/s
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Coefficient of friction f-dry
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0.02-0.25
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Coefficient of friction f-oil lubricated
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0.02-0.12
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Typical Applications
This material meets the demanding criteria for long life and trouble-free performance with or without lubricant, of high safety factor even.
The bronze backing provides a high corrosion resistance, anti magnetic properties and a good thermal conductivity, The bearings are particularly appropriate for high temperature environment where no oil is efficient and the machine must be under successive long period working condition.
The typical applications covered Steel metallurgy industry such as bushes for roller grooves of successive casting machines, cement grouting pumps and screw conveyers for cement and so on.
Other Standard SBU-B Shapes
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