Test method for evaluating aging behavior of tetragonal zirconia polycrystallines
1 Scope
This standard specifies the terms and definitions, principle, apparatus and instruments, test procedures and result calculation regarding the test method for evaluating aging behavior of tetragonal zirconia polycrystallines.
This standard is applicable to tetragonal zirconia polycrystallines.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 10586 Specifications for damp heat testing chambers
JJG/T 629 Verification regulation for polycrystalline X-ray diffractometer
3 Terms and definitions
For the purposes of this standard, the following terms and definitions apply.
3.1
aging behavior Vm-75
degree of transition from tetragonal phase to monoclinic phase in tetragonal zirconia polycrystallines occurred when placed at a temperature of 75°C and a relative humidity of 95% for 168h
3.2
accelerated aging behavior Vm-200
degree of transition from tetragonal phase to monoclinic phase of tetragonal zirconia polycrystallines occurred when placed at a temperature of 200°C under atmospheric water vapor flow for 24h
4 Principle
After the tetragonal zirconia polycrystalline samples were placed under certain temperature and humidity conditions for a period of time, the surface phase content was measured with an X-ray diffractometer, and the monoclinic phase volume fraction was used as a measure of the aging behavior.
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Apparatus and instruments
6 Test procedures
7 Calculation of aging behavior
8 Test report
