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Alpha Alumina Powder

Product Description
Alpha-alumina powder is a technologically important material that has been extensively used in industry for its mechanical properties and its high chemical stability in a wide range of temperatures. Our products - BL325F & BL825F offer advantages of high purity, very small crystal diameter, low sintered temperature, high sintered density, high strength, high wear and corrosion resistant and high hardness. Thus, their application is expanding and enlarging in high-tech as the main raw material for producing electronic ceramics, functional ceramics and structural ceramics.


  Application:

Typical Forming Method:
 
  • Composition Parts
  • Polishing Materials
  • Special Ceramics
  • Tool/knife
  • Fluorescence Lamp-house
  • Casting
  • Crush
  • Dry Pressing
  • Equal Static Pressure
  • Rolling
  • Injection
Product Specification

Designation BL325F BL825F
Chemical Composition Higher purity √  

Ordinary purity

  √

Low-soda

√  

Middle-soda

  √
Crystal Diameter

Very small

√ √

Small

   

Ordinary

   

Large

   

BET

Large

√

Ordinary

   

Small

   

Loosed Density

Large

   

Ordinary

   

Small

√ √
Sintering Temperature Large √ √
Ordinary    
Small    

Designation BL325F BL825F BL3012U BL12MJ
Chemical Composition (%) Moiture ≤ 0.4 0.4 0.3 0.3
Loss on Ignition ≤ 0.05 0.05 0.05 0.05
AL2O3 ≥ 99.9 99.8 99.6 99.7
MgO ≤        
Fe2O3 ≤ 0.03 0.05 0.03 0.03
SiO2 ≤ 0.03 0.03 0.03 0.03
Na2O ≤ 0.03 0.08 0.04 0.1

A Crystal Diameter (μm)

 ≤ 0.25 ＜1 1.0 ～ 1.5
Specific Gravity (g/cm3) 3.94 ～ 3.98

Ungrounded

Particle Size (D50, μm)

 16 ～ 20 17 ～ 20 36 ～ 40

BET (m2/g)

3.7 3.7 2.06 2.2

Loosed density (g/cm3)

 0.52 0.52 0.54 0.98
Super Grounded SiO2 ≤ 0.03 0.03 0.04 0.04
* Particle Size (D50, μm) 0.5 ～ 0.8 0.5 ～ 0.8 4 ～ 5 1.8 ～ 2.0
BET (m2/g) (4.89) (4.89)   (2.4)
Loosed Density (g/cm3) (0.84) (0.84)   (0.54)
Pressed Density (g/cm3) 2.01 2.01 / 1.71 ～ 1.87
Balls of 92% Al2O3 Sintering temperature (℃) / 1,560
Shrinkage (%,d) / 19.2 19.5
Sintered density (g/cm3) / 3.678 3.680
Self-abrasion (g/kg.h) / 0.067 0.041
Equivalent weight abrasion (g/kg.h) / 0.027 0.016
Pure Al2O3 Powder Sintering temperature (℃) 1,600
Shrinkage (%,d) 19.48 / 19.43 / /
Sintered density (g/cm3) 3.86 ～ 3.91 / /
Relative density (g/cm3) 97.0 ～ 98.1 / /
Pure Al2O3 Powder Sintering temperature (℃) 1,650
Shrinkage (%,d) 19.60 19.30 / 16.0 ～ 19.5
Sintered density (g/cm3) 3.89 ～ 3.92 / 3.68
Relative density (g/cm3) 97.9 ～ 98.4 / 92.5
Pure Al2O3 Powder Sintering temperature (℃) 1,700
Shrinkage (%,d) 19.7 18.3 / 17.9 / 21.1
Sintered density (g/cm3) 3.90 ～ 3.91 / /
Relative density (g/cm3) 97.9 ～ 98.1 / /
0.5% MgO added Sintering temperature (℃) / / 1,650
Shrinkage (%,d) / / 16.8 ～ 16.6 / 18.4 ～ 19.4
Sintered density (g/cm3) / / /
Relative density (g/cm3) / / /
95% Al2O3 Sintering temperature (℃) 1,600
Shrinkage (%,d) 17.0 ～ 18.8 16.1 ～ 17.4 / 16.9 ～ 18.0 / 22.2 ～ 23.8
Sintered density (g/cm3) 3.71 ～ 3.86 / 3.55 ～ 3.61
Relative density (g/cm3) 93.21 ～ 97.04 / 92.10 ～ 93.77
95% Al2O3 Sintering temperature (℃) 1,650
Shrinkage (%,d) / / 17.0 ～ 20.1 / 21.7 ～ 25.4
Sintered density (g/cm3) / / 3.63 ～ 3.69
Relative density (g/cm3) / / 94.4 ～ 97.3

* The particle size can be made according to customer's requirements.

 

 
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