High Alumina Balls for Ceramic Grinding Media

Data&Item

Hight Frequency Ceramic

75%alumina Ceramic

95%  alumina Ceramic

99% alumina Ceramic

Titanium Oxide

Zirconia

Mullite

Content

steatite 85%

alumina≥75%

alumina≥95%

alumina≥99%

Titanium Oxide≥90%

Zirconia≥90%

3ALz032si02

Fring temperature(°C)

1350±20

1400-1450

1650-1680

1780-1800

1450±20

1550-1600

1260-1540

Bulk density(fired) (g/cm)

2.8

3.2

≥3.6

≥3.8

≥3.7

>6

3.25

Dielectric Strength(kv/mm)

15

13

15

15

15

Water absorption(%)

<0.02

<0.015

<0.01

<0.01

<0.01

<0.01

<0.01

Compressive Strength

560

2200

2400

3700

7200

5000

Hardness(HRA)

≥75

≥75

≥82

≥88

≥80

≥85

65-70

Volume Resistance  (cm) 25°C

≥1012

>1012

>1012

>1012

<1012

>1012

≥1012

Bending Strength(MPA)

126

280

320

400

150

700

180

Thermal Expansion(*10) 25°C-700°C

6-7.5

6

6.2-8.5

6.8-8

9-10

4-4.4

Permittivity(MHZ)

6

5.5

8.5

9.5

7

Roughness(Ra)

≤0.8

≤0.8

<0.1

Mirror Polish

<0.3

≤0.1

≤0.05

≤0.03