Performance indicators of structural ceramics for electronic components

Serial number

project

Test Conditions

Units and symbols

Ceramic material

Talc porcelain

75% Al2O3 porcelain

90% Al2O3 porcelain

95% Al2O3 porcelain

99% Al2O3 porcelain

1

Bulk density

g/cm³

>2.70

>3.20

>3.40

>3.60

>3.70

2

Flexural strength

kgf/cm³

1400

2000

2300

2800

3000

3

Linear expansion coefficient

20~100℃

×10^-6mm/℃

≤8

≤6

-

-

-

20~500℃

×10^-6mm/℃

-

-

6.3~6.7

6.5~7.5

6.5~7.5

20~800℃

×10^-6mm/℃

-

-

6.3~6.7

6.5~8

6.5~8

4

Thermal Conductivity

cal/cm·s·℃

-

-

-

-

-

5

Dielectric coefficient

1MHz 20℃

≤7.5

<9

9~10

9~10

9~10.5

     500℃

-

-

-

9~10

-

10GHz 20℃

-

-

9~10

9~10

9~10.5

6

Dielectric loss tangent

1MHz 20℃

×10^-4

≤8

≤10

≤6

≤4

≤2.5

     500℃

×10^-4

-

-

-

30~40

-

10GHz 20℃

×10^-4

-

-

-

≤10

≤6

7

Volume resistivity

100℃

Ω·cm

>10¹²

>10¹²

>10¹³

>10¹³

>10¹³

300℃

Ω·cm

-

-

>10¹⁰

>10¹⁰

>10¹⁰

500℃

Ω·cm

-

-

-

>10⁸

>10⁹

8

Breakdown strength

kV/mm

20

20

15

15

15

9

Chemical stability

1:9HCL

mg/cm²

-

-

-

≤7.5

≤0.7

10%NaOH

mg/cm²

-

-

-

≤0.2

≤0.1

10

Porosity

%

-

-

-

-

-