Abstract
A plasma‐sprayed thermal barrier coating consisting of a NiCoCrAlY bond coat and Ce‐stabilized zirconia ceramic coating was heat‐treated at 400°C for 1000 h. Microhardness measurements were used to evaluate microstructural variations throughout the coating. One hundred and twenty measurements were performed at both the bond coat and ceramic coating positions within the thermal barrier coating system. Both data sets were analyzed to assess whether they could be described as Gaussian (i. e., “normal”) or Weibull distributions. The influence of the sample size, i. e., the number of microhardness tests for a group, on the mean hardness value was also evaluated by a Monte Carlo simulation procedure. The mean value, the standard deviation, the coefficient of variation, and the Weibull modulus for the subsets of data were calculated to assess these effects. The confidence for the mean value was also considered. The results indicated that the reliability of the microhardness test improved as the sample size increased. At least 20 measurements were needed to distinguish differences in micro‐hardness between the bond coat and the ceramic coating at a 95% confidence level.
| Original language | English |
|---|---|
| Pages (from-to) | 1406-1410 |
| Number of pages | 5 |
| Journal | Journal of the American Ceramic Society |
| Volume | 78 |
| Issue number | 5 |
| DOIs | |
| Publication status | Published - 1995 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Ceramics and Composites
- Materials Chemistry
Cite this
Simulation of Hardness Testing on Plasma‐Sprayed Coatings. / Lin, Chung‐Kwei ‐K; Lin, Chung‐Chieh ‐C; Berndt, Christopher C.
In: Journal of the American Ceramic Society, Vol. 78, No. 5, 1995, p. 1406-1410.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Simulation of Hardness Testing on Plasma‐Sprayed Coatings
AU - Lin, Chung‐Kwei ‐K
AU - Lin, Chung‐Chieh ‐C
AU - Berndt, Christopher C.
PY - 1995
Y1 - 1995
N2 - A plasma‐sprayed thermal barrier coating consisting of a NiCoCrAlY bond coat and Ce‐stabilized zirconia ceramic coating was heat‐treated at 400°C for 1000 h. Microhardness measurements were used to evaluate microstructural variations throughout the coating. One hundred and twenty measurements were performed at both the bond coat and ceramic coating positions within the thermal barrier coating system. Both data sets were analyzed to assess whether they could be described as Gaussian (i. e., “normal”) or Weibull distributions. The influence of the sample size, i. e., the number of microhardness tests for a group, on the mean hardness value was also evaluated by a Monte Carlo simulation procedure. The mean value, the standard deviation, the coefficient of variation, and the Weibull modulus for the subsets of data were calculated to assess these effects. The confidence for the mean value was also considered. The results indicated that the reliability of the microhardness test improved as the sample size increased. At least 20 measurements were needed to distinguish differences in micro‐hardness between the bond coat and the ceramic coating at a 95% confidence level.
AB - A plasma‐sprayed thermal barrier coating consisting of a NiCoCrAlY bond coat and Ce‐stabilized zirconia ceramic coating was heat‐treated at 400°C for 1000 h. Microhardness measurements were used to evaluate microstructural variations throughout the coating. One hundred and twenty measurements were performed at both the bond coat and ceramic coating positions within the thermal barrier coating system. Both data sets were analyzed to assess whether they could be described as Gaussian (i. e., “normal”) or Weibull distributions. The influence of the sample size, i. e., the number of microhardness tests for a group, on the mean hardness value was also evaluated by a Monte Carlo simulation procedure. The mean value, the standard deviation, the coefficient of variation, and the Weibull modulus for the subsets of data were calculated to assess these effects. The confidence for the mean value was also considered. The results indicated that the reliability of the microhardness test improved as the sample size increased. At least 20 measurements were needed to distinguish differences in micro‐hardness between the bond coat and the ceramic coating at a 95% confidence level.
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U2 - 10.1111/j.1151-2916.1995.tb08505.x
DO - 10.1111/j.1151-2916.1995.tb08505.x
M3 - Article
VL - 78
SP - 1406
EP - 1410
JO - Journal of the American Ceramic Society
JF - Journal of the American Ceramic Society
SN - 0002-7820
IS - 5
ER -