White aluminium oxide (WA)

White aluminium oxide (WA) is produced by bayer alumina in an electric arc furnace at high temperatures. The product shows higher hardness and lower toughness than that of brown aluminium oxide. The materials are used to grind high carbon steel, high speed steel and chilled steel. It can also be used as polishing materials and precision founding sand, spraying and coating materials, catalyst carrier, special ceramics and super refractory materials.

 

Grain Usages and Types

Usage

For vitrified wheels

For organic wheels

For coated abrasives

For refractory materials

Type

WA

WA-B

WA-P

WA-R

 

 

Physical Characteristics

Item

Basic mineral

Crystal system

Crystal color

Mohs hardness

Density

White aluminum oxide

α- Al2O3

Hexagonal

White

9

≥3.90g/cm3

Item

Micro hardness

Electrical resistivity

Grinding ability(compared
with diamond as one)

Linear expansion coefficient
(when 900℃ α•10-6k-1)

White aluminium oxide

HV2200-2300

1014-1016Ω•cm

0.12

8.3

 

 

Chemical Composition ( GB/T 2479-2008 )

Type

Grit

Chemical composition (%, by weight)

Al2O3

Na2O

WA

F4-F80

≥99.10

≤0.35

F90-F150

≥99.10

≤0.40

F180-F220

≥98.60

≤0.50

F230-F800

≥98.30

≤0.60

F1000-F1200

≥98.10

≤0.70

WA-B

F4-F80

≥99.00

≤0.50

F90-F150

≥99.00

≤0.60

F180-F220

≥98.50

≤0.60

WA-P

P12-P80

≥99.10

≤0.35

P100-P150

≥99.10

≤0.40

P180-P220

≥98.60

≤0.50

P240-P800

≥98.30

≤0.60

P1000-P1200

≥98.10

≤0.70

P1500-P2500

≥97.50

≤0.90

WA-R

0-1mm

≥99.00

≤0.50

1-3mm

≥99.00

≤0.50

3-5mm

≥99.00

≤0.50

5-8mm

≥99.00

≤0.50

 Note: Special requirement on chemical composition can be satisfied through discussion.

 



White Aluminium Oxide (WA)