NEN EN 821-1 : 1995

Foreword
1. Scope
2. Normative references
3. Definitions
4. Principle
5. Apparatus
6. Test pieces
7. Procedure
8. Calculation of results
9. Reporting of results
10. Test report
ANNEXES
A (normative) Calibration of apparatus (direct-
    measuring instruments)
B (normative) Calibration of apparatus (differential
    type)
C (informative) Thermal expansion reference data
D (informative) Bibliography
TABLES
1. Requirements for accuracy levels A and B
2. Thermal expansion reference data
FIGURES
1. Schematic diagrams of apparatus arrangements
2. Suitable constructions of test piece holders in
    silica and alumina
3. Silica ball test piece support and carrier
4. Example of arrangement of differential thermocouples
    to monitor temperature distribution in the test
    piece, where T1, T2, are differential temperatures
5. Test pieces with a) rounded ends for use with flat
    plate and push rod surfaces and b) flat square ends
    for use with rounded end plate and push rod surfaces
    in a conventional horizontal dilatometer

Describes the method for the determination of the linear thermal expansion characteristics of advanced monolithic technical ceramics up to a maximum temperature of 1500 degrees C and to specified level of accuracy. Describes general principles of calibration, construction and operation of suitable apparatus.