Characteristic uses of corundum
White corundum is made of high quality aluminum oxide powder as raw material, refined and crystalline by electromelting, with high purity, good self-sharpness, acid and alkali corrosion resistance, high temperature resistance, and stable thermal performance. ,,
1 .WFA physical indicators
|
Item |
Index |
|
Colour |
White |
|
Crystal |
Six party system |
|
Mohs' scale of hardness |
≥9.0 |
|
Melting point(℃) |
2250 |
|
Temperature Max(℃) |
1900 |
|
True density (g/cm3) |
≥3.90 |
|
Linear expansion coefficient(0-1600℃) |
7-9 |
2 . WFA chemical composition
|
Purpose |
规格 |
Al2O3, |
Na2O |
SiO2 |
磁性物% |
CaO |
|
Abrasives |
F12#-80# |
≥99.0 |
≤0.5 |
- |
≤0.4 |
≤0.003 |
|
90#-150# |
≥98.5 |
≤0.6 |
≤0.003 |
|||
|
180#-240# |
≥98.2 |
≤0.7 |
- |
≤0.4 |
≤0.002 |
|
|
W1#-63# |
≥98.5 |
≤0.8 |
≤1.0 |
≤0.5 |
≤0.001 |
|
|
Refractory material |
0-1mm 1-3mm3-5mm5-8mm8-12mm |
≥99.0 |
≤0.5 |
- |
≤0.4 |
≤0.003 |
|
180#-0 200#-0 320#-0 |
≥98.5 |
≤0.3 |
≤0.5 |
≤0.001 |
3 . For Refractory:White Fused Alumina(WFA or WA)is made from chemical by Higgns furnace or Tilting furnace at high temperature.It is very important raw material for advanced refractories and abrasives.Its properties are as folowing.
|
Type Properties |
Lower sodium I |
Middle sodium II |
|||||||
|
Fraction(mesh) |
Fine(mesh) |
Fraction(mesh) |
Fine(mesh) |
||||||
|
Guarantee Value |
Typical value |
Guarantee Value |
Typical value |
Guarantee Value |
Typical value |
Guarantee Value |
Typical value |
||
|
Chemical Composition (%) |
α-Al2O3 |
≥99 |
99.3 |
≥98.5 |
99.23 |
≥99 |
99.14 |
≥98.5 |
98.75 |
|
SiO2 |
≤0.2 |
0.15 |
≤0.3 |
0.22 |
≤0.4 |
0.12 |
≤0.4 |
0.19 |
|
|
Fe2O3 |
≤0.2 |
0.04 |
≤0.25 |
0.04 |
≤0.2 |
0.01 |
≤0.25 |
0.05 |
|
|
Na2O |
≤0.15 |
0.12 |
≤0.25 |
0.18 |
≤0.4 |
0.35 |
≤0.5 |
0.23 |
|
|
Principal crystalline phase |
α-Al2O3 |
||||||||
|
Crystal system |
Hexzagon |
||||||||
|
Colour |
white |
||||||||
|
True density (g/cm3) |
≥3.95 |
||||||||
|
Packing density (g/cm3) |
1.75-1.95 |
||||||||
|
Mohs hardness |
9 |
||||||||
|
Linear expansion (1/°C) |
8.3×10-4 |
||||||||
|
Size(mm) |
8-5 5-3 3-1 1-0 |
||||||||
|
Fine(mesh) |
-80,-120,-240,-320 |
||||||||
|
Micropowder(um) |
3-5 5-10 |
||||||||
|
Test standard |
GB/T3044-89 |
||||||||
|
Packing |
25kg/bag 1000kg/big bag |
||||||||
|
Usage |
Refractories |
||||||||
4 . WFA for Abrasives Composition of the Grain Size Standard
(GB/T2481.1-1998)
|
Grain size |
Best Coarse |
Coarse |
Normal part |
Mixed part |
Fine part |
|||
|
100%pass these mesh NO. |
Not pass mesh NO |
Weight%short |
Not pass |
Weight%More than |
Not pass mesh NO |
Weight%More than |
More than 3% pass these mash NO. |
|
|
F4 |
5/16 |
31/2 |
20 |
4 |
40 |
4 5 |
70 |
6 |
|
F5 |
0.265 |
4 |
20 |
5 |
40 |
5 6 |
70 |
7 |
|
F6 |
31/2 |
5 |
20 |
6 |
40 |
6 7 |
70 |
8 |
|
F7 |
4 |
6 |
20 |
7 |
40 |
7 8 |
70 |
10 |
|
F8 |
5 |
7 |
20 |
8 |
45 |
8 10 |
70 |
12 |
|
F10 |
6 |
8 |
20 |
10 |
45 |
10 12 |
70 |
14 |
|
F12 |
7 |
10 |
20 |
12 |
45 |
12 14 |
70 |
16 |
|
F14 |
8 |
12 |
20 |
14 |
45 |
14 16 |
70 |
18 |
|
F16 |
10 |
14 |
20 |
16 |
45 |
16 18 |
70 |
20 |
|
F20 |
12 |
16 |
20 |
18 |
45 |
18 20 |
70 |
25 |
|
F22 |
14 |
18 |
20 |
20 |
45 |
20 25 |
70 |
30 |
|
F24 |
16 |
20 |
25 |
25 |
45 |
25 30 |
65 |
35 |
|
F30 |
18 |
25 |
25 |
30 |
45 |
30 35 |
65 |
40 |
|
F36 |
20 |
30 |
25 |
35 |
45 |
35 40 |
65 |
45 |
|
F40 |
25 |
35 |
30 |
40 |
40 |
40 45 |
65 |
50 |
|
F46 |
30 |
40 |
30 |
45 |
40 |
45 50 |
65 |
60 |
|
F54 |
35 |
45 |
30 |
50 |
40 |
50 60 |
65 |
70 |
|
F60 |
40 |
50 |
30 |
60 |
40 |
60 70 |
65 |
80 |
|
F70 |
45 |
60 |
25 |
70 |
40 |
70 80 |
65 |
100 |
|
F80 |
50 |
70 |
25 |
80 |
40 |
80 100 |
65 |
120 |
|
F90 |
60 |
80 |
20 |
100 |
40 |
100 120 |
65 |
140 |
|
F100 |
70 |
100 |
20 |
120 |
40 |
120 140 |
65 |
200 |
|
F120 |
80 |
120 |
20 |
140 |
40 |
140 170 |
65 |
230 |
|
F150 |
100 |
140 |
15 |
200 |
40 |
200 230 |
65 |
325 |
|
F180 |
120 |
170 |
15 |
200 230 |
40 |
200 230 270 |
65 |
|
|
F220 |
140 |
200 |
15 |
230 270 |
40 |
230 270 325 |
65 |
|
|
F240 |
170 |
200 |
5 |
230 270 |
8 |
230 270 325 |
38 |
|
5 . Feature :
Its hardness is slightly higher than brown corundum, slightly lower toughness, high purity, good self-sharpness, strong grinding ability, small heat value, high efficiency, acid and alkali corrosion resistance, high temperature and thermal stability.
The white Fuesd Alumina has a Mohs hardness of 9.0, a packing density of 1.55-1.95g/cm3, a true density of 3.95 g/cm3, and a volume density of 3.60 . The hardness of white corundum is slightly higher than brown corundum, but the toughness is slightly poor grinding easy to cut into the workpiece, good sharpness, small heat, grinding ability, high efficiency .
6 . Application :
Suitable for grinding high hardness of steel, such as high speed steel, high carbon steel, quenching steel, alloy steel, etc.
suitable for grinding high carbon steel, high speed steel and stainless steel and other fine-grained abrasive materials can also be used in precision casting and advanced refractory materials.
Contact us
Tina
Qinyuan Fuda New Material Technology Co., Ltd
Address: Qinyuan, Shanxi Province
Mob.: +86 18636559668
Email:tina@fudanewmaterial.com
http://www. fudanewmaterial.com
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