Evidence-first editorial standard
This guide separates observed facts, engineering assumptions and data that still require confirmation. It does not promise a universal service life or replace the exact product data and project specification.
Both materials answer sliding abrasion, but they fail in different ways
Chromium carbide overlay plate is a mild steel base with a hard, carbide-rich weld deposit; alumina ceramic is a hard, brittle tile fixed to the steel. Overlay wears progressively and can be welded, bent and repaired on site; ceramic wears more slowly under fine abrasive flow but can crack under heavy impact or let go if its fixing fails. The choice is therefore a question of which failure the zone can tolerate.
Fine abrasive flow at low impact favours ceramic
Where fine or medium material slides steadily — chute bottoms, hopper walls, cyclone bodies, pipe bends — alumina keeps its surface longer per millimetre of thickness than a carbide overlay, because the whole surface is hard rather than a matrix with hard carbides in it. Laboratory abrasion tests such as ASTM G65 rank materials under one condition only; confirm the ranking against the measured wear of the zone.
Impact, heat and distortion favour overlay
Where large lumps strike from height, where the steel runs hot, or where the structure flexes, overlay plate copes better than tile: it does not crack as a unit, its fixing is the weld itself, and it tolerates temperatures at which adhesives cannot be used. Overlay deposits do show surface check cracks by design; those are normal and are not a reason for rejection. Where impact and abrasion combine, toughened ceramic in IC IMPACT is the ceramic option to compare.
Fabrication and repair change the total cost
Overlay plate can be cut, rolled and welded into a chute body in the workshop, and patched on site with the right consumable. Ceramic needs prepared steel, a fixing system and installers who know it, and repairs mean replacing tiles. On a geometry with many cuts and penetrations, the labour difference can outweigh the wear difference; on a large, simple surface the reverse is often true. The cost lines are set out in what a ceramic lining costs.
The usual best answer is to zone, not to choose once
Many transfer chutes perform best with overlay plate or a material bed in the impact zone and ceramic on the sliding faces downstream, or with ceramic tiles on overlay backing where both mechanisms meet. Mapping the zones first, as described in chute liner selection and sizing, avoids paying for ceramic where it will crack and for overlay where it will wear through. The wider comparison of liner families is in wear-resistant liner families.
What to send to compare both options
Send the drawing, the wear map with depths, the material and lump size, the drop heights, the steel temperature and the current liner history. Induscoat can then propose ceramic zones in IC TILE or shaped IC CUSTOM parts alongside the zones where overlay or steel remains the better answer. The equipment approach is on our page on impact and transfer point linings.