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NIST Structural Ceramics Database (SCD) Database

NIST Standard Reference Database 30

Last Update to Data Content: 2002

DOI: http://dx.doi.org/10.18434/T4F30D

SCD Citation Number: Z00319

Bibliographic Information

Reference:
"Chemical and Physical Parameters Influence on Aluminium Nitride Based Ceramics Thermal Diffusivity," J.P. Michelet, A. Hafidi, J.P. Lecompte, J. Jarrige, M. Billy, C. Martin, and J. Mexmain, Euro-Ceramics, Vol. 2, pp. 52-56 (1989), edited by G. de With, R.A. Terpstra, and R. Metselaar, published by Elsevier Applied Science.
Language: English
Notes: Subtitle: Properties of Ceramics

General Materials Processing Notes

SCD Citation Number: Z00319
"Aluminium nitride powder [Starck Co, Berlin grade B] was prepared by the reduction process of alumina with carbon in nitrogen atmosphere. ...sintering additives such as calcia or yttria were added to aluminium nitride. Three sintering methods have been applied to the mixed powder: 
     Pressureless sintering (PS):
After uniaxial pressing with free die at 150 MPa, the compact bodies were sintered in an aluminium nitride crucible at 1800 °C during 5 hours in nitrogen atmosphere 
     Hot Pressing (HP):
The powder was hot pressed into 8 mm diameter compacts in a boride nitride coated die under a pressure of 25 MPa during one hour between 1700 °C and 1800 °C in nitrogen flowing 
     Hot Isostatic Pressing (HIP):
It was carried out on four hot pressed compacts (80% density) capsuled in quartz. The pressure and the temperature are gently applied to respectively 170 MPa and 1700 °C during one hour."

Measurement Methods

Laser flash technique
"Thermal diffusivity was measured by a laser flash method using a neodynium-doped glass laser operating at 1.06 µm with pulse length of 400 ms, and a liquid nitrogen cooled In-Sb detector. The pulse energy was 70 J. The specimen discs of 8 mm diameters were cut and polished to about 4 mm thick. Both specimen surfaces were coated with carbon to assure complete absorption of the flash, and avoid laser shine-through. The thermal diffusivity "a" has been deduced from a = 0.1399 e2/t1/2 where t1/2 (s) is the time required for the back surface to reach half of the maximum temperature value and e (cm) is the thickness of the sample."

Index of Materials and Properties

Material Number 1: AlN·xCaO·yY2O3

Material Specification and Properties for AlN·xCaO·yY2O3

Material number 1 of 1
in SCD Citation Number: Z00319
Chemical Class: Nitride
Chemical Family: Al-N
Formula: AlN·xCaO·yY2O3
Informal Name: aluminum nitride
Structure Type: Polycrystalline
Manufacturer: In-House
Process:

AlN·xCaO·yY2O3

Material number 1 of 1
in SCD Citation Number: Z00319
Elemental Composition
Amount of
Element
( formula units ) 		Element
 
( no unit )
1 Al
1 N

Measurement Method: Reported Formula
Evaluation Status: Unevaluated

AlN·xCaO·yY2O3

Material number 1 of 1
in SCD Citation Number: Z00319
Sintering Aids
Sintering Aid
 
( no unit )
CaO
Y2O3

Measurement Method: Reported Formula
Evaluation Status: Unevaluated

AlN·xCaO·yY2O3

Material number 1 of 1
in SCD Citation Number: Z00319
Density (mass)
Temperature
 
( °C ) 		Mass Fraction
of Y2O3
( % ) 		Mass Fraction
of CaO
( % ) 		Process
Type
  		Density
 
( g cm-3 )
23 0 1 PS 3.211
23 2 0 PS 3.257
23 8 0 PS 3.303
23 0 0 HP 3.23
23 0 1 HP 3.17
23 2 0 HP 3.26
23 8 0 HP 3.36
23 0 0 HIP 3.26
23 0 1 HIP 3.23
23 2 0 HIP 3.28
23 8 0 HIP 3.38

Measurement Method: Unknown
Evaluation Status: Unevaluated
Cautions:
No measurement details were noted. PS = pressureless sintered. HP = hot pressed. HIP = hot isostatically pressed.

AlN·xCaO·yY2O3

Material number 1 of 1
in SCD Citation Number: Z00319
Porosity
Process
Type
  		Temperature
 
( °C ) 		Thermal
Diffusivity
( cm2 s-1 ) 		Density
 
( g/cm3 ) 		Porosity
 
( % )
HP 23 0.226 ± 0.005 3.23 0.9
HP 23 0.226 ± 0.005 3.20 1.8
HP 23 0.220 ± 0.006 3.15 3.4
HP 23 0.221 ± 0.007 3.13 4.1
HP 23 0.216 ± 0.004 3.11 4.6
HP 23 0.208 ± 0.005 3.04 6.8
HP 23 0.196 ± 0.004 3.01 7.7

Measurement Method: Unknown
Evaluation Status: Unevaluated
Cautions:
No measurement details were noted. The material is AlN with no addition. HP = hot pressed. The density values in this table assume the maximum theoretical density for pure AlN is 3.26 g/cm3.

AlN·xCaO·yY2O3

Material number 1 of 1
in SCD Citation Number: Z00319
Thermal Diffusivity
Temperature
 
( °C ) 		Mass Fraction
of Y2O3
( % ) 		Mass Fraction
of CaO
( % ) 		Process
Type
  		Thermal
Diffusivity
( cm2 s-1 )
23 0 1 PS 0.25
23 2 0 PS 0.28
23 8 0 PS 0.37
23 0 0 HP 0.23
23 0 1 HP 0.22
23 2 0 HP 0.22
23 8 0 HP 0.33
23 0 0 HIP 0.25
23 0 1 HIP 0.23
23 2 0 HIP 0.23
23 8 0 HIP 0.33
23 0 0 HP 0.227 ± 0.006
410 0 0 HP 0.13 ± 0.03
490 0 0 HP 0.11 ± 0.02
575 0 0 HP 0.092 ± 0.006
680 0 0 HP 0.079 ± 0.008

Measurement Method: Laser flash technique
Evaluation Status: Evaluated by acceptance criteria
Cautions:
PS = pressureless sintered. HP = hot pressed. HIP = hot isostatically pressed. Digitized data were obtained from Figure 2 of the paper. See Property:Density for corresponding values of density at room temperature.