In:
Journal of the American Ceramic Society, Wiley, Vol. 98, No. 9 ( 2015-09), p. 2689-2691
Abstract:
The effect of Hf additions on the thermal properties of ZrB 2 ceramics was studied. Reactive hot pressing of ZrH 2 , B, and HfB 2 powders was used to synthesize (Zr 1− x ,Hf x )B 2 ceramics with Hf contents ranging from x = 0.0001 (0.01 at.%) to 0.0033 (0.33 at.%). Room‐temperature heat capacity values decreased from 495 J·(kg·K) −1 for a Hf content of 0.01 at.% to 423 J·(kg·K) −1 for a Hf content of 0.28 at.%. Thermal conductivity values decreased from 141 to 100 W·(m·K) −1 as Hf content increased from 0.01 to 0.33 at.%. This study revealed, for the first time, that small Hf contents decreased the thermal conductivity of ZrB 2 ceramics. Furthermore, the results indicated that reported thermal properties of ZrB 2 ceramics are affected by the presence of impurities and do not represent intrinsic behavior.
Type of Medium:
Online Resource
ISSN:
0002-7820
,
1551-2916
DOI:
10.1111/jace.2015.98.issue-9
Language:
English
Publisher:
Wiley
Publication Date:
2015
detail.hit.zdb_id:
2008170-4
detail.hit.zdb_id:
219232-9