French
A battery material manufacturer reported an unusual problem:
Over a period of eight months, multiple SSiC roller rods failed in nearly the same kiln location.
The rollers came from different production batches and were installed at different times.
Despite replacement with new rollers, failures continued to occur.
The customer initially suspected inconsistent material quality.
However, the repeated failure pattern suggested a different root cause.
The failed rollers showed:
- Similar crack locations
- Comparable fracture patterns
- Consistent failure positions within the kiln
Notably, adjacent kiln zones showed no unusual wear or damage.
Temperature measurements revealed that the affected zone experienced larger thermal fluctuations during startup and shutdown.
Additional inspection identified:
- Slight support misalignment
- Uneven contact loading
- Increased thermal gradient near the transition section
The investigation concluded that the failures were system-driven rather than material-driven.
The combination of:
- Thermal cycling
- Support-induced contact stress
- Localized temperature variation
created a stress concentration zone that repeatedly damaged rollers.
The customer implemented:
- Support alignment correction
- Improved temperature control
- Periodic monitoring of contact interfaces
After these changes, roller life increased significantly.
When failures repeatedly occur in the same kiln location, the system itself is often the primary cause.
Replacing rollers without addressing kiln conditions rarely solves the problem.
Why Most SiC Roller Failures Are System-Driven Rather Than Material-Driven
Why Small Temperature Differences Can Destroy SiC Rollers?
Why Small Installation Errors Can Destroy SiC Rollers?