| Brown Fused Alumina |
Brown fused alumina is made from high quality bauxite by fusing in an electric arc furnace at high temperature. It has good toughness and high hardness. It is suitable for manufacturing of vitrified and resin bonded tools, and for lapping,polishin, and sand blasting and sand cleaning.
It can be also used to make superior refractory products. |
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| Chemical & Physical Properties |
Crystal Form |
Alpha alumina trigonal system |
Chemical nature |
Amphoteric |
Reaction with acids |
Subject to mild attack by aqua and/or hydrofluoric acid |
Reaction with Alkalies |
Very slight with strong hot solution only |
Oxidation-reduction effects |
None |
True Density(g/cm3) |
3.97 |
Hardness |
Knoop(kg/cm2) |
2000-2200 |
Moh¡¯s |
9.0 |
Color |
Dark Brown |
Color after firing |
Light blue |
Melting point |
2000¡ãC |
Max Usable temperature |
1900¡ãC |
Specific heat¡¡(cal/g.¡ãC) |
0.26(20-29¡ãC) |
Coefficient of thermal conductivity (cal/cm2.sec.¡ãC) |
Room temperature |
900¡ãC |
0.047 |
0.013 |
Electrical resistivity (Wcm) |
30¡ãC |
300¡ãC |
900¡ãC |
1600¡ãC |
1016 |
1013 |
105 |
104 |
Coefficient of liner expansion (x10-6) |
7-9(0-1600¡ãC) |
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| Chemical Composition (% by weight) |
Grit
Item |
10 ¨C 90 |
100 ¨C 180 |
220 - 220 |
230-400 |
500-1200 |
Al2O3 |
94.5 - 97.0 |
93.5 min |
92.5 min |
91.0 min |
89.0 min |
TiO2 |
1.5 - 3.8 |
1.5 - 3.8 |
1.5 - 3.8 |
4.0 max |
4.0 max |
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| Magnetic Matters Contents (% by weight) |
Grit No. |
Magnetic Matters Content |
16#-30 |
<0.0380 |
36#-60# |
<0.0280 |
70-120# |
<0.0230 |
150#-220# |
<0.0170 |
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| Available grain sizes |
| Grit No. |
Micron |
Grit No. |
Micron |
Grit No. |
Micron |
| 10 |
2360 ~ 2000 |
30 |
710 ~ 600 |
80 |
212 ~ 180 |
| 12 |
2000 ~ 1700 |
36 |
600 ~ 500 |
90 |
180 ~ 150 |
| 14 |
1700 ~ 1400 |
40 |
500 ~ 425 |
100 |
150 ~ 125 |
| 16 |
1400 ~ 1180 |
46 |
425 ~ 355 |
120 |
125 ~ 106 |
| 20 |
1180 ~ 1000 |
54 |
355 ~ 300 |
150 |
106 ~ 75 |
| 22 |
1000 ~ 850 |
60 |
300 ~ 250 |
180 |
90 ~ 63 |
| 24 |
850 ~ 710 |
70 |
250 ~ 212 |
220 |
75 ~ 53 |
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| Available mircron powder sizes |
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Standard werte der Mikro-F-Reihe
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| Brown Fused Alumina Refractories (% by weight) |
Group Sizes of BFA |
Mixed Sizes of BFA |
Sizes
(mm) |
Chemical Content
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Sizes
(mm) |
Chemical Content
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8-5
5-3
3-1
1-0 |
Al2O3>94.50
SiO2<1.2
Fe2O3<0.2
TiO2<3.8
CaO<0.5
MgO<0.4 |
25-0
10-0
5-0
3-0 |
Al2O3>94.50
SiO2<1.2
Fe2O3<0.2
TiO2<3.8 |
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| Application |
Vitrified tools |
Lapping |
Resinoid tools |
Blasting |
Polishing |
Scrubing |
Tumbling |
Deburring |
Self-tumbling |
Non-slip |
Lapping compound |
Wire saw |
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Tel/Fax: + 86 755 83660116, info@kaiteindustry.cn, szkaite@hotmail.com
Copyright Kaitexin All rights reserved. |
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