Pink aluminium oxide (PA)

Pink aluminium oxide (PA) is produced by bayer alumina and right quantity oxidized chromium in an electric arc furnace at high temperatures. Compared with white aluminium oxide, the product shows similar hardness and lower toughness. The abrasive tools which made of PA have excellent durability and high processing cleanness. The materials are used to grind measuring and cutting tools, instruments, threading workpieces, etc. which demand low roughness on the surface.

 

Physical Characteristics

Item

Basic mineral

Crystal system

Crystal color

Mohs hardness

Density

Pink aluminium oxide

α- Al2O3

Hexagonal

Pink

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)

Pink aluminium oxide

HV2200-2300

1014-1016Ω•cm

0.12

8.3

 

 

Chemical Composition

Grit

Low chromium

Medium chromium

High chromium

Al2O3

Cr2O3

Na2O

Al2O3

Cr2O3

Na2O

Al2O3

Cr2O3

Na2O

F12-F80

≥98.50

0.20-0.45

≤0.50

≥98.20

0.45-1.00

≤0.55

≥97.40

1.00-2.00

≤0.50

F90-F150

≥98.50

≤0.55

≥98.20

≤0.60

≥97.00

≤0.60

F180-F220

≥98.00

≤0.60

≥97.80

≤0.70

≥96.50

≤0.70

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

 



Pink Aluminium Oxide (PA)