What Is Abrasive Wear? Definition, Types & Why It Matters for Materials
What Is Abrasive Wear?
Abrasive wear is the progressive removal of material from a surface caused by the mechanical action of hard particles or asperities cutting, scratching, or plowing across it. It is one of the most common and economically significant wear mechanisms — responsible for the majority of material degradation in earthmoving equipment, mining machinery, agricultural implements, conveyor systems, cutting tools, and tribological components across virtually every materials-intensive industry.
Understanding abrasive wear — its mechanisms, measurement methods, and material resistance factors — is essential for engineers selecting materials for wear-critical applications and for quality laboratories qualifying wear-resistant materials and coatings.
Mechanisms of Abrasive Wear
Two-Body Abrasion
Two-body abrasion occurs when hard asperities or particles fixed to one surface slide against a softer mating surface — like sandpaper scratching wood. The hard contact points cut microgrooves (scratches) and displace material as ribbons or chips. Material removal rate is governed by the hardness ratio between abrasive and substrate.
Three-Body Abrasion
Three-body abrasion occurs when loose abrasive particles are free to roll and slide between two moving surfaces — acting as multiple micro-cutting tools simultaneously. This mechanism is prevalent in:
- Mineral processing equipment handling ore pulp
- Gear teeth with abrasive contamination in lubricant
- Pneumatic conveying of abrasive powders
- Slurry pump impellers
Three-body abrasion is typically 10–100× less severe than two-body abrasion at the same particle hardness and contact stress — because the particles roll as well as slide, reducing the effective cutting angle.
Erosive Wear (Solid Particle Erosion)
Erosive wear is caused by a stream of solid particles impacting a surface at high velocity at various impact angles. Low-angle impacts (<30°) produce cutting wear (similar to two-body abrasion); high-angle impacts (>60°) produce deformation-dominated wear. Ductile materials wear fastest at low angles (cutting dominant); brittle materials wear fastest at high angles (impact fracture dominant).
Gouging Abrasion
Large, hard rock fragments or particles cut deep grooves into softer surfaces under high contact stress — dominant in jaw crushers, ball mills, and rock cutting equipment. Gouging severity distinguishes between “low stress” abrasion (fine particle abrasion) and “high stress” abrasion (particle fracture and deep gouging).
Key Material Properties Governing Abrasive Wear Resistance
Hardness: The most important single property — harder materials resist scratching by abrasive particles more effectively. Empirically, abrasive wear rate is approximately inversely proportional to material hardness for pure metals and steels. Microstructure: The distribution, size, and hardness of carbides, nitrides, and hard phases in high-hardness alloys (white cast iron, hard-facing alloys, cemented carbides) determine wear resistance beyond bulk hardness. Fracture toughness: For materials harder than the abrasive, wear resistance is governed by toughness — susceptibility to microchipping and fracture at hard phase boundaries.
Abrasive Wear Testing Methods
ASTM G65 — Dry Sand/Rubber Wheel Abrasion Test
ASTM G65 is the primary low-stress abrasion wear test for metals. A specimen is pressed against a rotating rubber wheel while dry sand is metered between them. Weight loss after a defined number of wheel rotations characterises abrasion resistance under low-stress conditions relevant to sliding abrasion in agricultural and mining applications.
ASTM G75 — Miller Slurry Abrasion Test
ASTM G75 measures wear resistance in wet abrasion (slurry) conditions — relevant for slurry pumps, pipelines, and mineral processing equipment.
ASTM B611 — Wear Resistance of Carbide Composites
Used for cemented carbide and hardmetal materials, applying a rotating hardened steel wheel under a slurry of abrasive particles.
DIN Abrasion (ISO 4649)
For rubber and elastomeric materials — described in Blog 99 of Series 1.
Pin-on-Disk Test (ASTM G99)
Measures two-body sliding wear rate and friction coefficient — provides fundamental tribological data for bearing and seal material selection.
Industrial Applications
Mining equipment faces extreme abrasive wear — crusher liners, grinding mill liners, and slurry pump impellers are replaced on cycles of weeks to months. Selecting optimal materials (high-chromium white cast iron, wear-resistant steels, rubber, or composite materials) based on ASTM G65 and G75 data significantly extends component life. In the cutting tool industry, ASTM B611 carbide wear data guides selection of WC-Co grades with optimal hardness-toughness balance for machining abrasive workpieces.
Why Choose Infinita Lab for Abrasive Wear Testing?
Infinita Lab provides ASTM G65, ASTM G75, ASTM G99, and DIN abrasion testing through our nationwide accredited tribology testing laboratory network.
Looking for a trusted partner to achieve your research goals? Schedule a meeting with us, send us a request, or call us at (888) 878-3090 to learn more about our services and how we can support you.
Frequently Asked Questions (FAQs)
What is the most important material property for resisting abrasive wear? Hardness is the primary material property governing abrasive wear resistance — harder materials resist scratching and cutting by abrasive particles more effectively. However, at very high hardness levels (>700 HV), fracture toughness becomes equally important — brittle high-hardness materials may wear rapidly through microchipping despite high scratch hardness.
How does particle hardness relative to material hardness affect abrasive wear rate? Abrasive particles cause significant wear only when they are harder than the material surface. When particle hardness Hp < 0.8 × material hardness Hm, the particles are too soft to scratch the surface and wear rate drops to near zero ("no wear" regime). When Hp > Hm, wear rate increases rapidly with the hardness ratio.
What is the difference between abrasive wear and adhesive wear? Abrasive wear is caused by hard particles or asperities cutting material from a surface — producing scratches and chips. Adhesive wear occurs when opposing surfaces in sliding contact form adhesive junctions (cold welds) that fracture — transferring material fragments between surfaces. Both can occur simultaneously in real tribological contacts but respond differently to material selection and lubrication.
Why is the ASTM G65 test called a "low stress" abrasion test? In ASTM G65, sand particles pass between the specimen and a soft rubber wheel under relatively low contact stress — the abrasive particles do not fracture during the test. This "low stress" condition simulates abrasion in applications where particles slide across the surface without impact fracture (agricultural soil tillage, chute liners). "High stress" abrasion tests simulate conditions where particles fracture under contact (crushing, grinding), creating sharper abrasive faces and higher wear rates.
Can rubber provide better abrasive wear resistance than steel in some applications? Yes. In slurry and particle handling applications, soft rubber absorbs particle impact elastically — the rubber deforms around particles rather than being cut by them. This elastic resilience mechanism makes high-quality rubber liners highly effective in slurry pumps, pipelines, and cyclone classifiers handling fine abrasive particles at low to moderate particle size. Steel outperforms rubber for large, angular particles and cutting abrasion under high stress.
