Long-Term Stability of WC-C Peritectic Fixed Point

Khlevnoy, B. B.; Grigoryeva, Irina

doi:10.1007/s10765-014-1808-9

Cited by 10 publications

(6 citation statements)

References 5 publications

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“…More studies are needed to understand the source of the instability of the Re-C point and to quantify its limits. In parallel, studies of the alternative HTFP from the WC-C peritectic should be pursued [54], which provides a higher temperature than Re-C, to see if it is more stable.…”

Section: Resultsmentioning

confidence: 99%

Thermodynamic temperature assignment to the point of inflection of the melting curve of high-temperature fixed points

Woolliams

Anhalt

Ballico

et al. 2016

Phil. Trans. R. Soc. A.

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The thermodynamic temperature of the point of inflection of the melting transition of Re-C, Pt-C and Co-C eutectics has been determined to be 2747.84 ± 0.35 K, 2011.43 ± 0.18 K and 1597.39 ± 0.13 K, respectively, and the thermodynamic temperature of the freezing transition of Cu has been determined to be 1357.80 ± 0.08 K, where the ± symbol represents 95% coverage. These results are the best consensus estimates obtained from measurements made using various spectroradiometric primary thermometry techniques by nine different national metrology institutes. The good agreement between the institutes suggests that spectroradiometric thermometry techniques are sufficiently mature (at least in those institutes) to allow the direct realization of thermodynamic temperature above 1234 K (rather than the use of a temperature scale) and that metal-carbon eutectics can be used as high-temperature fixed points for thermodynamic temperature dissemination. The results directly support the developing mise en pratique for the definition of the kelvin to include direct measurement of thermodynamic temperature.

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Section: Resultsmentioning

confidence: 99%

Thermodynamic temperature assignment to the point of inflection of the melting curve of high-temperature fixed points

Woolliams

Anhalt

Ballico

et al. 2016

Phil. Trans. R. Soc. A.

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“…As it was shown in [18], the long-term instability of the WC-C cell (small cell of the same design and the same producer than the cell we used) might be estimated as 0.12 K per 140 melts. The cell used in this investigation was rather new and went through approximately 20 melts.…”

Section: Temperature Measurement Of Htfpmentioning

confidence: 83%

“…The temperature differences measured were −0.51 K, −0.50 K and −0.46 K, respectively. The average difference was −0.49 K. The melting temperature of the large-cell WC-C fixed point blackbody was defined as 3020.11 K using the average value of the WC-C fixed point, 3020.60 K, based on available measured values for small cells [17,18,27,28]. In future, after the Real-K project [12], the value of the WC-C fixed point might be updated.…”

Section: Large-area Wc-c Blackbody Temperature Measurementmentioning

confidence: 99%

“…For WC-C small-cell blackbody, the average value of the published measured thermodynamic temperatures (POI) is 3020.6 K (u = 0.35 K, k = 1) [18]. However, the temperature of cell may vary from cell to cell.…”

Section: Temperature Measurement Of Htfpmentioning

confidence: 99%

“…The 3 mm diameter WC-C HTFP blackbodies are generally used in radiation thermometry [13,14], or in radiometry for traceability to temperature scale [15,16]. After development and investigation of small WC-C cells with cavity diameters of 3 mm and 5 mm [17,18], VNIIOFI developed a large area fixed-point cell blackbody with the cavity diameter of 14 mm [19]. The large-area cell has longer phase-transition melting plateau and relatively high radiation flux compared to a small-area HTFP cell of the same type (figure 1).…”

Section: Introductionmentioning

confidence: 99%

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Spectral irradiance scale realization and uncertainty analysis based on a 14 mm diameter WC–C fixed point blackbody from 250 nm to 2500 nm

Dai

Wang

et al. 2022

Metrologia

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Spectral irradiance scale in the wavelength range from 250 nm to 2500 nm was realized at National Institute of Metrology (NIM) on the basis of a large area tungsten carbide–carbon (WC-C) high temperature fixed point blackbody, which is composed of a 14 mm diameter WC-C fixed point cell and a variable temperature blackbody BB3500MP as a furnace. A series of 1000 W FEL tungsten halogen lamps were used as transfer standards. The new spectral irradiance scale was compared with the scale based on a variable-temperature blackbody BB3500M, and the divergence between these two methods varied from -0.66% to 0.79% from 280 nm to 2100 nm. The measurement uncertainty of spectral irradiance scale based on fixed-point blackbody was analyzed, and the expanded uncertainty was estimated as 3.9% at 250 nm, 1.4% at 280 nm, 0.43 % at 400 nm, 0.27% at 800 nm, 0.25% at 1000 nm, 0.62% at 1500 nm, 0.76% at 2000 nm, and 2.4% at 2500 nm respectively. In the range from 300 nm to 1000 nm the fixed-point scale was improved obviously: the uncertainty decreased by more than 25% compared to the uncertainty based on the variable temperature blackbody. Below 300 nm, the uncertainty became higher because the signal to noise ratio was poor. Above 1100 nm, the contribution of temperature measurement to the uncertainty of spectral irradiance decreases, therefore the uncertainties of two methods are almost at the same level. The fixed-point blackbody was also used to realize the correlated colour temperature and distribution temperature of a tungsten filament lamp, the deviation from the variable temperature blackbody method was -0.5 K and -2.9 K, respectively.

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Radiation Thermometry of Blackbodies

Sapritsky

Prokhorov²

2020

Blackbody Radiometry

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Long-Term Stability of WC-C Peritectic Fixed Point

Cited by 10 publications

References 5 publications

Thermodynamic temperature assignment to the point of inflection of the melting curve of high-temperature fixed points

Thermodynamic temperature assignment to the point of inflection of the melting curve of high-temperature fixed points

Spectral irradiance scale realization and uncertainty analysis based on a 14 mm diameter WC–C fixed point blackbody from 250 nm to 2500 nm

Radiation Thermometry of Blackbodies

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