PSI - Issue 40

M.V. Fedorov et al. / Procedia Structural Integrity 40 (2022) 145–152 Fedorov M.V., Vasilieva M.I. / Structural Integrity Procedia 00 (2022) 000 – 000

147

3

performed using the STA 449C Jupiter synchronous thermal analysis device (NETZSCH Pumps & Systems Ltd., Holywell, Wales). Quantitative analysis and processing of the results were carried out using the XPP method of the Software INCA Energy software. 4. Results and Discussions. The work consists of three stages: the first stage is the determination of the quantitative composition and identification of the phases of the initial UDP spinel; the second stage is the study of the processes occurring during the heating of the powder according to the modes: from room temperature to 600 ○ C; 1000 ○ C and 1450 ○ C; the third stage is a discussion of the results.

Fig. 1. A fragment with a magnification of 1000 times for Table 1.

Micro X-ray spectral and X-ray diffraction analysis showed the correspondence of the elemental composition of the initial sample of UDP spinel and the presence of impurities that are contained in the products of obtaining powder materials. Specifically, Figure 1 shows a fragment of the determination of the quantitative composition of the initial spinel powder with a magnification of 1000 times, and the results are presented in the form of Table 1. X ray phase analysis shows the spinel composition, consisting of spinel phases, periclase and phases of layered double hydroxides (Mg6Al2(OH)18•4.5H2O). The X -ray phase analysis results of UDP spinel are presented in a diffraction pattern in Figure 2.

Table 1. The chemical composition of the elements of initial UDP spinel. Spectrum In stats. Na

Mg

Al

Total

1 2 3 4

Yes Yes Yes Yes

1.83 0.50 1.35 1.48 1.29 0.57 1.83 0.50

62.85 29.66 27.29 45.82 41.40 16.50 62.85 27.29

35.32 69.84 71.36 52.70 57.31 16.92 71.36 35.32

100.00 100.00 100.00 100.00 100.00

Mean

Std.devition

Max. Min.

Made with FlippingBook - professional solution for displaying marketing and sales documents online