Ceramic Lined Wear-resistant Centrifugal Fan

Overview

Ceramic composite relies on hard alumina to resist abrasive cutting; hardness is far above a hardfaced deposit, but the material is brittle and sensitive to how it is fixed. The design problem is not the ceramic itself but the anchoring and the joints that keep blocks from detaching.

Composite Areas and Typical Figures

Liners suit low velocity, blunt angle wear zones, while high velocity impeller areas usually use hardfacing or spraying, so the two are often combined.

Location	Process	Typical figure
Volute inner wall	Alumina ceramic composite liner	Alumina content 92%-95%
Inlet cone	Ceramic tiles or composite liner	Hardness typically HRA 88-92
Impeller front plate	Local ceramic composite	Applied to the wear pattern
Duct bends	Replaceable ceramic liner	Severe blunt angle wear zone
Joints and edges	Resin or dedicated adhesive sealing	Prevents peeling from the edge

Anchoring and Anti-detachment

Location	Process	Typical figure
Block layout	Blocks shaped to the flow path with expansion gaps	Releases thermal and vibration stress
Anchoring	Welded anchors combined with adhesive bonding	Improves overall reliability
Adhesive control	Controlled bond line thickness and curing	Ensures bond strength
Edge protection	Corner strip or retaining batten at edges	Stops high velocity flow lifting the edge
Inspection	Tap testing for voids at intervals	Finds detachment risk early

Applications

Applications include aggregate crushing, cement grinding, foundry sand handling, ceramic and glass polishing and mineral powder conveying.

Where the medium contains fluorides the glass phase of the ceramic is attacked, so a ceramic liner alone is not suitable and the material combination has to be reconsidered.

Liners should be designed as replaceable parts so that blocks can be renewed by wear measurement without damaging the main structure.

Acceptance and Verification

Standard	Title	Purpose
GB/T 4340.1	Metallic materials - Vickers hardness test - Part 1	Coating and hardened layer hardness
ASTM G65	Standard test method for measuring abrasion using the dry sand/rubber wheel apparatus	Relative abrasive wear resistance
GB/T 24186	High strength abrasion resistant steel plates for construction machinery	Wear plate material acceptance
GB/T 1236	Industrial fans - Performance testing using standardized airways	Air flow, pressure and efficiency testing
GB/T 9239.1 / ISO 21940-11	Mechanical vibration - Balance quality requirements for rigid rotors	Impeller balancing grade

Please provide particle size, dust concentration, inlet velocity and medium temperature. Size and motor power are calculated for the actual duty.

FAQ

Can ceramic liners be blown off?

Detachment usually starts at joints and edges. Block layout with expansion gaps, welded anchors combined with adhesive, edge protection and periodic tap testing keep the risk within acceptable limits.

Is ceramic or hardfacing more wear resistant?

For pure abrasive wear, alumina ceramic is harder and lasts longer, but it does not tolerate impact or fluoride bearing media and performs worse than hardfacing under coarse particle impact or strong vibration. Practical schemes often combine both.

Can liners be replaced locally?

Yes, that is the advantage of composite lining. Replacement by wear measurement keeps the main structure intact, and common sizes should be included in the spare parts list at the design stage.

Related pages: Wear-resistant fan range  Wear-resistant centrifugal fan  Dust collection and wear protection