Products

SINTERED ALUMINA

Features

  • Temporarily fired alumina is pressure-formed on a briquetting machine, dried, and sintered at high temperature near its melting point (2050°C) in a rotary kiln.
  • It is a polycrystalline sintered body of corundum having a dense internal structure. It is high-purity SINTERED ALUMINA containing 99.5% of Al2O3.
  • This product has the following advantageous chemical and physical properties:
    • High mechanical strength
    • High thermal conductivity
    • High resistance to thermal shock
    • High melting point
    • High electric insulation
    • High chemical stability
    • High resistance to wear

Product lineup

We manufacture 2 types of SINTERED ALUMINA, A-37 and A-S, having respective unique features.

A-37

SINTERED ALUMINA A-37

SINTERED ALUMINA A-37

We developed this SINTERED ALUMINA in 1971 by our original manufacturing method. By adding a slight amount of MgO, it is controlled to suppress abnormal crystalline growth and have the uniform structure of 20 – 40μm.

A-S

SINTERED ALUMINA A-S

SINTERED ALUMINA A-S

This SINTERED ALUMINA is highly stable in volume at high temperature. Special attention is directed so that the invasion of even an infinitesimal quantity of impurities can be prevented.
MgO is not added.

Product information

Standard quality

  A-37 A-S
Coarse/medium grain product Ball mill crushed product Coarse/medium grain product Ball mill crushed product
Chemical composition (%) Al2O3 99.56 99.53 99.68 99.67
SiO2 0.02 0.03 0.02 0.02
Fe2O3 0.02 0.03 0.02 0.03
TiO2 Tr. Tr. Tr. Tr.
CaO 0.03 0.03 0.03 0.03
MgO 0.09 0.10 Tr. Tr.
K2O 0.01 0.01 Tr. Tr.
Na2O 0.27 0.27 0.25 0.25
Ig.loss Tr. Tr. Tr. Tr.
Total 100.00 100.00 100.00 100.00
Physical property Apparent specific gravity 3.82 - 3.79 -
Bulk specific gravity 3.74 - 3.61 -
Water absorption (%) 0.5 - 1.3 -
Apparent porosity (%) 1.9 - 4.8 -
True specific gravity 3.94 - 3.94 -
True porosity (%) 5.3 - 7.6 -
Coefficient of thermal expansion
(×10-6)
20-800°C 8.6 - 8.6 -
20-1500°C 8.6 - 8.7 -

Guaranteed quality

  A-37 A-S
Coarse/medium grain product Ball mill crushed product Coarse/medium grain product Ball mill crushed product
Chemical composition (%) Al2O3 Min. 99.5 Min. 99.0 Min. 99.5 Min. 99.0
SiO2 Max. 0.10 Max. 0.20 Max. 0.10 Max. 0.20
Fe2O3 Max. 0.10 Max. 0.15 Max. 0.10 Max. 0.15
CaO + MgO Max. 0.25 Max. 0.25 Max. 0.10 Max. 0.10
K2O + Na2O Max. 0.30 Max. 0.30 Max. 0.30 Max. 0.30
Physical property
(6-10 mesh crushed product)
Bulk specific gravity Min. 3.60 - Min. 3.55 -
Apparent porosity (%) Max. 5.0 - Max. 8.0 -

If you have any inquiry, please contact the following:

[Ceramics Sales Dept.]
12-8, Shiokusa-cho, Seto-shi, Aichi 489-0895, Japan
Tel: +81-561-21-5670  Fax: +81-561-21-4124

→For the inquiry form, click here.

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