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煅烧棕刚玉 Calcined Grains of BFA For abrasives
  煅烧棕刚玉通过高温1100℃二次煅烧:
    ①可将硅铁合金从刚玉颗粒分裂出来,以利加磁选效果。
    ②可提高磨料的强度和亲水性、增加韧性。
    ③煅烧使棕刚玉中的低价钛氧化成高价钛有利于消除磨具烧成时的"反常膨胀"避免"网状裂纹"。
   实践证明煅烧棕刚玉磨料是加工高档磨具的最佳配料。
棕刚玉磨料煅烧前后韧性值比较
磨料粒度
未煅烧
1000℃煅烧
1350℃煅烧
24#
46
63
73
30#
56
67
74
36#
71
83
88
46#
67
79
88
60#
54
66
68
80#
78
83
85

 

It is one kind of Brown Aluminium Oxide grains with blocky grain shape and high bulk density. To get this kind of product, we calcine the regular grains at a high temperature to give a blue colour, the purpose is to renovate the crack on the surface and interior of crystal and then to improve the toughness and durability of the grains.
As an abrasive, It is mainly used in making vitrified and organic bonded grinding wheels for working in heat sensitive metals and alloys.

  Typical Chemical Analysis  
Al2O3 Fe2O3 TiO2 SiO2 CaO
95.70% 0.12% 2.66% 0.98% 0.22%
  Physical Properties  
Color Dark brown
Shape Blocky, tough and sharp
Crystal Form Alpha-alumina trigonal system
True Specific Gravity
3.96 g/cm3
Hardness
2090 Knoop scale; 9.0 Mohs scale
Melting Temperature

About 2050 ℃

Magnetic Material 0.0076%
Toughness 63.17
Hydrophilic 75.00
  Bulk Density Test Value (g/cm3)
Grit No F12 F14 F16 F20 F22 F24 F30 F36 F40 F46
B.D 1.98 1.97 1.96 1.91 1.91 1.91 1.90 1.85 1.80 1.80
Grit No F54 F60 F70 F80 F90 F100 F120 F150 F180 F220
B.D 1.75 1.75 1.75 1.74 1.73 1.73 1.73 1.70 1.69 1.64
  Grit Size Available (F)
8 12 14 16 20 22 24 30 36 40 46 54 60 70 80 90 100
120
150 180 220 240 280 320 360 400 500 600 800 1000 1200 1500 2000
  Particle Size Distribution (PSD)
PSD According to ISO, ANSI, FEPA and JIS.
  Packing Way Selection
a. In 25kg plastic woven bags.
b. In 1000kg big bag.
c. 40 x 25kg plastic woven bags in one big bag.
d. 40 x 25kg plastic woven bags on pallet.
e. 40 x 25kg paper bags on pallet.
f. According to client’s special requirement.
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