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
    end plate and push rod surfaces and b) flat square
    ends for use with rounded end plate and push rods
    surfaces in a conventional horizontal dilatometer

This part of EN 821 desribes the method for the determination of the linear thermal expansion characteristics of advanced monolithic technical ceramics up to a maximum temperature of 1500°C and to a specified level of accuracy A or B as defined in table 1. The method describes general principles of construction, calibration and operation of suitable apparatus. Specific details, including test piece dimensions, depend on the design of the apparatus. Methods of calibration are given in annexes A and B. Thermal expansion reference data are given in annex C.