Product Selection Criteria

Structural Components

CerCo -- Diamonite Products Selection Criteria

CerCo -- Diamonite Products Selection Criteria

 

 Properties

 

Units

 

Aluminum Oxide

Nominal Aluminum Oxide Content

 

Percent Alumina

 

87

 

92

 

94

 

94

 

96

 

99.5

Density (Apparent Specific Gravity)

 

gm/cc

 

3.48

 

3.57

 

3.67

 

3.7

 

3.75

 

3.90-3.94

Phases

 

Major
Minor
Trace

 

alpha Al203
Amorphous
__

 

alpha Al203
Amorphous
__

 

alpha Al203
Amorphous
__

 

alpha Al203
Amorphous
__

 

alpha Al203
Spinel
__

 

alpha Al203
__
Ca, Mg

Hardness HV5 (KHN5)

 

kg/mm2

 

985
(880)

 

1050
(880)

 

1120
(970)

 

1100
(990)

 

1255
(1,185)

 

1530
(1,400)

Flexural Strength (3 Point)

 

kpsi
MPa

 

42
290

 

46.5
320

 

47
324

 

50
345

 

50
345

 

55
379

Weibull Modulus

 

__

 

6

 

11

 

9

 

16

 

12

 

10

Tensile Strength (ACMA Test #4)

 

kpsi
MPa

 

18.0
124

 

18.5
127

 

24.0
165

 

28.5
196

 

22.0
151

 

31.2
215

Compressive Strength (ASTMC-733-74)

 

kpsi
MPa

 

235
1600

 

280
1900

 

350
2400

 

350
2400

 

325
2241

 

260
1800

Fracture Toughness, Kic (Indentation)

 

MPa m 1/2

 

3.9

 

__

 

3.9

 

4.5

 

3.7

 

4.3

Young' s Modulus (Ultrasonic)

 

psi

 

3.60E+07

 

4.25E+07

 

4.00E+07

 

4.61E+07

 

4.50E+07

 

4.80E+07

Shear Modulus (Ultrasonic)

 

psi

 

1.50E+07

 

1.75E+07

 

1.65E+07

 

1.90E+07

 

1.80E+07

 

1.90E+07

Poisson's Ratio
(ASTMC-623)

 

 

 0.20

 

 0.21

 

0.21 

 

0.21 

 

0.25 

 

 0.26

Coefficient of Linear Thermal Expansion
(x per degree C) (ASTM-32)

 

25-200C
25-500C
25-800C
25-1000C

 

5.10E-06
6.50E-06
7.50E-06
8.00E-06

 

5.10E-06
6.70E-06
7.50E-06
7.80E-06

 

3.60E-06
6.70E-06
7.70E-06
8.10E-06

 

5.20E-06
7.30E-06
8.00E-06
8.50E-06

 

5.40E-06
7.40E-06
8.10E-06
8.50E-06

 

5.10E-06
7.40E-06
8.10E-06
8.50E-06

Thermal Conductivity W/m/degree K

 

25C
400C
800C
1000C

 

21.0
__
__
__

 

17.0
__
__
__

 

28.1
__
__
__

 

20.0
__
__
__

 

28.5
10.1
6.3
5.4

 

35.4
12.1
7.5
6.4

Dielectric Strength (ASTMD-149 6.35mm)

 

V/mil

 

__

 

211

 

204

 

212

 

207

 

215

Dielectric Constant at 25 degrees C (ASTMD-116)

 

1KHz
1MHz
1GHz

 

__
__
__

 

__
8.8
__

 

__
9.2
__

 

__
9.3
__

 

__
9.5
__

 

__
9.8
__

Dissipation Factor at 25 degrees C (ASTMD-116)

 

1KHz
1MHz
1GHz

 

__
__
__

 

__
0.008
__

 

__
0.007
__

 

__
0.002
__

 

__
0.016
__

 

__
0.002
__

Volume Resistivity Ohm-cm
(ASTMC-257)

 

100C
300C
500C
700C

 

__
__
__

__

 

__
1.00E+13
1.00E+10

__

 

9.50E+14
1.20E+12
1.20E+09
2.50E+07

 

__
1.00E+08
1.00E+07
__

 

1.80E+14
1.40E+10
5.80E+07
3.50E+06

 

1.50E+15
2.50E+11
5.50E+08
1.60E+07

Thermal Shock (Hasselman)

 

Degrees C

 

200

 

200

 

200

 

200

 

200

 

200

Porosity (Helium Mass Spectrometer)

 

Gas
Tight

 

Gas
Tight

 

Gas
Tight

 

Gas
Tight

 

Gas
Tight

 

Gas
Tight

Water Absorption

 

None

 

None

 

None

 

None

 

None

 

None

Color

 

Off White

 

White

 

White

 

Pink

 

White

Off White 

 


 

CerCo -- Diamonite Products Selection Criteria

 

 Properties

 

Units

 

Zirconia

 

Silicon Nitride

 

Direct Sintered Silicon Carbide

 

Nominal Aluminum Oxide Content

 

Percent Alumina

 

ZTA

 

TZP

 

Si3N4

 

SiC

Density (Apparent Specific Gravity)

 

gm/cc

 

4.48

 

6.05

 

3.2

 

3.12

Phases

 

Major
Minor
Trace

 

alpha Al203
t-ZrO2
M-ZrO2

 

t-ZrO2
__
M-ZrO2

 

__
__
__

 

alpha SiC
__
__

Hardness HV5 (KHN5)

 

kg/mm2

 

1650
(1,500)

 

1150
(1,035)

 

1180
(1,062)

 

2600
(2,400)

Flexural Strength (3 Point)

 

kpsi
MPa

 

110
756

 

120
825

 

100
692

 

72
500

Weibull Modulus

 

__

 

11

 

19

 

18

 

8

Tensile Strength (ACMA Test #4)

 

kpsi
MPa

 

70
481

 

85
584

 

__
__

 

__
__

Compressive Strength (ASTMC-733-74)

 

kpsi
MPa

 

425
2930

 

425
2930

 

__
__

 

362
2500

Fracture Toughness, Kic (Indentation)

 

MPa m 1/2

 

6.5

 

12.0

 

5.2

 

3.5-4.0

Young' s Modulus (Ultrasonic)

 

psi

 

4.03E+007

 

2.50E+007

 

4.00E+007

 

6.3E+007

Shear Modulus (Ultrasonic)

 

psi

 

1.65E+07

 

1.105E+07

 

__

 

__

Poisson's Ratio (ASTMC-623)

 

 

 0.22

 

 0.33

 

.28

 

.16

Coefficient of Linear Thermal Expansion
(x per degree C) (ASTM-32)

 

25-200C
25-500C
25-800C
25-1000C

 

7.80E-06
8.50E-06
9.10E-06
9.10E-06

 

5.90E-06
9.90E-06
1.07E-05
1.09E-05

 

__
__
__
3.00E-06

 

4.40E-06
__
__
__

Thermal Conductivity W/m/degree K

 

25C
400C
800C
1000C

 

15.8
__
__
__

 

2.9
__
__
__

 

16.7
__
__
__

 

50
__
__
__

Dielectric Strength
(ASTMD-149 6.35mm)

 

V/mil

 

__

 

__

 

__

 

__

Dielectric Constant at 25 degrees C (ASTMD-116)

 

1KHz
1MHz
1GHz

 

__
__
__

 

__
__
__

 

__
__
__

 

__
__
__

Dissipation Factor at 25 degrees C (ASTMD-116)

 

1KHz
1MHz
1GHz

 

__
__
__

 

__
__
__

 

__
__
__

 

__
__
__

Volume Resistivity Ohm-cm (ASTMD-257)

 

100C
300C
500C
700C

 

__
__
__

__

 

__
__
__

__

 

__
__
__
__

 

__
__
__
__

Thermal Shock (Hasselman)

 

Degrees C

 

250

 

320

 

__

 

300

Porosity (Helium Mass Spectrometer)

 

Gas
Tight

 

Gas
Tight

 

Gas
Tight

 

Gas
Tight

Water Absorption

 

None

 

None

 

None

 

None

Color

 

White

 

Gold

 

Gray

 

Gray

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