Bronze liner plates have carried sliding loads for a century, and on most machines they still do the job. The question that keeps coming back from maintenance teams is narrower: on which surfaces can a self-lubricating alloy plate take over, and where does it quietly fail because the duty was misread? The answer sits in three numbers and one habit.
Bronze is a solid copper alloy. It carries high surface pressure, tolerates temperature well above the range of self-lubricating alloys, and recovers from dirt ingress by embedding particles in the softer phase of its structure. On a heavily loaded trunnion, a mill housing liner under shock load, or any surface that runs hot, bronze is not the conservative choice, it is the correct one.
The weakness is lubrication dependence. A bronze liner running dry does not gently wear: friction rises, the surface picks up on the counterface, temperature climbs, and the pair can seize. Where grease lines are long, nipples are hard to reach, or intervals get stretched during production pushes, that is where bronze liners die.
YH-ML is a self-lubricating wear alloy supplied as liner plates. Its published envelope is continuous service to 120 C, surface pressure to 5 MPa and sliding speed to 40 m/s. Those limits define the switch:
| Temperature | 120 C continuous or below |
|---|---|
| Surface pressure | up to 5 MPa |
| Sliding speed | up to 40 m/s |
| Failure mode observed | Lubrication-related pickup, scoring, short oil starvation |
| Maintenance access | Poor, with long grease intervals |
When all of these hold, a YH-ML plate behaves like a bronze liner with insurance: it slides on its own film long enough to survive a missed grease cycle, and it renews by unbolting rather than re-machining a housing.
The pattern behind most disappointing replacements is the same: the plate is chosen for cost, then run at bronze duty. If the machine needs bronze, buy bronze.
Two things kill liner plates faster than alloy selection. The first is a backing face that is not flat: bolt a plate onto a high spot and the load concentrates on a fraction of the area, edge pressure cracks the plate, and the crack gets blamed on the material. The second is a scored counterface: a new plate running against a damaged surface wears out in days.
Groove layout belongs to the same conversation. Longitudinal grooves suit reciprocating travel, annular grooves suit rotation, and oil holes must meet the existing drilled passage in the housing. Machining grooves to the drawing, rather than to a generic pattern, is what puts lubricant where the load is.
Keep bronze where temperature, pressure or shock exceed the envelope. Use YH-ML where the surface runs at or below 120 C and 5 MPa, slides at up to 40 m/s, and the history of the part is lubrication trouble rather than overload. Check flatness and counterface before fitting, and the plate will outlast the maintenance interval it was bought to survive.
When the sliding face stays at or below 120 C, surface pressure stays under about 5 MPa, and failures trace back to lubrication rather than overload. If the part is failing by cracking or deformation under high load, bronze is the safer choice.
It has a lower allowable surface pressure. That is why the switch is condition-based: at matching pressure and speed it does the same job, but above roughly 5 MPa bronze distributes load better.
Yes. Normal grease supply is still the design case. Self-lubrication is the margin that keeps the surface from seizing when grease arrives late, not a reason to stop lubricating.
Counterface condition, backing face flatness, bolt pattern and groove layout. A new plate against a scored counterface or an uneven backing will fail early regardless of alloy.
Technical data, machining options and ordering by drawing or sample.
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