Measurement of the melting temperature of ZrB 2 as determined by laser heating and spectrometric analysis
Measurement of the melting temperature of ZrB 2 as determined by laser heating and spectrometric analysis
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DOI：
10.1111/jace.17634
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发表时间：
2021-02
影响因子：
3.9
通讯作者：
A. Stanfield;D. Manara;D. Robba;G. Hilmas;W. Fahrenholtz
中科院分区：
文献类型：
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作者：
A. Stanfield;D. Manara;D. Robba;G. Hilmas;W. Fahrenholtz
采用激光诱导熔化法研究了两种不同ZrB 2陶瓷的熔化温度。反应热压法制备的低Hf含量ZrB 2的熔点为3546 K，工业级ZrB 2的熔点为3553 K。基于2-sigma和95%置信区间，温度测量的不确定度为绝对温度的1%，或两种材料的~35 K。虽然这些值与先前报道的ZrB 2熔化温度3518 K一致，但本研究能够测量Tm，其不确定性低于先前的研究（±45 K）。此外，该研究评估了Hf含量对熔化温度的影响，发现熔化温度对于1.75至0.01原子%的铪含量没有显著变化。本研究还测量了3000 K时ZrB 2的法向光谱发射率为0.34。在熔融温度下，发射率下降到0.28，然后，在液相中稳定在0.30。
The melting temperatures of two different ZrB2ceramics were studied using laser induced melting. ZrB2having a low Hf content, produced by reaction hot pressing, had a melting temperature of 3546 K and a commercial grade ZrB2had a melting temperature of 3553 K. Uncertainty of the temperature measurements was 1% of the absolute temperature, or ~35 K for both materials based upon 2‐sigma and a 95% confidence interval. While these values were consistent with the previously reported ZrB2melting temperature of 3518 K, this study was able to measureTmwith less uncertainty than previous studies (±45 K). Furthermore, this study assessed the effect of Hf content on melting temperature, finding that melting temperature did not change significantly for hafnium contents of 1.75 to 0.01 at%. This study also measured a normal spectral emissivity of 0.34 for ZrB2at 3000 K. The emissivity decreased to 0.28 at the melting temperature, then, stabilized at 0.30 in a liquid phase.