The relationship between erosion and wear of various

 

material quality

Alumina Al2O3

Zirconia ZrO2

silicon carbide

Silicon nitride Si3N4

density

3.8

5. 95

3.2

3.2

Elastic modulus × 104kg/mm2

3.8

3. 0

4.6

3.1

Bending strength MPa

255. 0

980.7

392.3

588.4

Hardness Hv

one thousand and five hundred

one thousand and four hundred

three thousand

one thousand and eight hundred

Coefficient of thermal expansion × 10-6/℃

7.9

8.8

4.3

3. 0

Bondability

Ions

Ions

Covalent

Covalent

Bond strength Kal/mol

Al-O, 122 four

Zr O, 181 six

Si-C, 104 ± 5

Si-N, 105 ± 9

Interatomic bonding and grain boundary bonding forces in grains

The Al O bond is firmly bonded and there are cracks on the grain boundaries

Low hardness; Phase transformation toughening and strengthening grain boundaries

Strong Si-C bonding with high porosity on grain boundaries

Strong Si-N bonding strength, uniform and dense grain boundaries

characteristic

High strength, good wear resistance, high temperature chemical stability

Good strength, toughness, high-temperature chemical stability

Good corrosion resistance, similar to silicon nitride

Good wear resistance, high temperature strength, high heat resistance, and good impact resistance

Surface damage behavior

Low angle 15 °

Micro cutting

Plow cutting

Grain peeling (slight)

Micro cutting

High angle 90 °

Brittle delamination

Plastic rheological intergranular exfoliation

Intergranular exfoliation

Grain boundary fracture

Evaluation of erosion and wear performance of materials from different angles

Suitable for low angle erosion and poor high angle erosion

Extremely poor resistance to low angle wear; The resistance to high angle grinding is better

Excellent resistance to low angle wear; Poor resistance to high angle wear

Suitable for low angle erosion and poor high angle erosion