b'Figure 4. Total hemispherical emissivity as a function of temperature measured using FTIR and LFA techniques. a) Comparison between measured values and reference range for carbon paint [4]; b) Comparison between measured values and reference range for oxidized INCONEL 600 alloy [5]ture. A novel inverse method wasa carbon painted Pyroceram 9606[2.]C. S. Kim, "Thermophysical developed to evaluate total emis- sample. The results are in veryproperties of stainless steels," sivity from transient laser flashgood agreement with the expectedArgonne National Laboraotry, measurements (thermograms). Thereference range [4]. The results onArgonne, 1975.method consists of a least squareINCONEL 600 show good agreement[3.]B. Cheng, B. Lane, J. Whiting and minimization scheme betweenwith the wide reference range [5]J. Chou, "A combined exper-measured and theoretical thermo- shown in Figure 4b. The slightlyimental-numerical method grams (calculated via finite elementhigher results obtained usingto evaluate powder thermal analysis). The logic scheme of theFTIR suggest the specimen usedproperties in laser powder bed method is described in Figure 3b.for the measurement was morefusion," Journal of Manufactur-Another method known as FTIRoxidized compared to the sampleing Science and Engineering, was applied at lower temperaturesmeasured via the LFA technique.vol. 140, pp. 1-8, 2018.(50C -600C). The equipment (seeSubsequently, measurements were Figure 3c) consists of a Hyperionperformed on a series of ATF clad- [4.]R. Brandt, C. Bird and G. Neuer, 3000, a high-resolution micro- ding specimens produced using"Emissivity reference paints for scope interfaced with the FTIRdifferent fabrication parameters. high temperature applications," Bruker VERTEX 70 spectrometer.Measurement, pp. 731-736, 2008.Spectral emissivity was measuredReferences:from 1.43 to 16.7 micrometers[1.]J. E. Daw, J. L. Rempe, D. L.[5.]R. Shurtz, "Total hemispherical at every temperature step andKnudson, K. G. Condie and J. C.emissivity of metals applicable subsequently integrated to obtainCrepeau, "Viability of pushrodto radiant heat testing," Sandia total hemispherical emissivity. dilatometry techniques for highNational Laboratories, Albu-temperature in-pile measure- querque, 2018.The measurements of total hemi- ments," Idaho National Labora-spherical emissivity via FTIR andtory, Idaho Falls, 2008.LFA are shown in Figure 4. Figure 4a shows the results obtained from 2023|AFC ACCOMPLISHMENTS 35'