Combustion Synthesis of C/MgAl2O4 Composite Powders and Their Microstructure Evolution

doi:10.19691/j.cnki.1004-4493.2021.04.002

China's Refractories ›› 2021, Vol. 30 ›› Issue (4): 7-11.DOI: 10.19691/j.cnki.1004-4493.2021.04.002

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Combustion Synthesis of C/MgAl₂O₄ Composite Powders and Their Microstructure Evolution

LYU Lihua¹^,², DING Donghai², XIAO Guoqing²

1) Department of Civil and Construction Engineering, Shanxi Institute of Technology, Yangquan 045000, China
2) School of Materials Science and Engineering, Xi’an University of Architecture and Technology, Xi’an 710043, China

Online:2021-12-15 Published:2021-12-10
About author:Lyu Lihua, born in 1986, got her PhD. degree in Xi’an University of Architecture and Technology in 2020. Since 2013 she has been working in the Department of Civil and Construction Engineering in Shanxi Institute of Technology.

Abstract

Abstract:

This work aims at solving the problems of difficult dispersion, easy oxidation and high cost of nano carbon during application, carbon/magnesium aluminate spinel (C/MgAl₂O₄) composite powders were prepared using MgC₂O₄·2H₂O, MgO₂, Al₂O₃powder, and Al powder as raw materials by combustion synthesis. The results indicate that with the maximum MgC₂O₄·2H₂O addition of 33.34 mass%, the prepared powder contains 1.17 mass% of carbon and carbon distributes among spinel grains. The MgAl₂O₄ spinel shows both granular and rod-like morphologies. The granular MgAl₂O₄ spinel is generated from mutual diffusion between MgO and Al₂O₃; while the rod-like MgAl₂O₄ spinel is mainly formed by the vapor-solid growth mechanism from Mg vapor and Al₂O₃.

Key words: C/MgAl₂O₄ composite powders, combustion synthesis, combustion front quenching test, microstructure evolution

LYU Lihua, DING Donghai, XIAO Guoqing. Combustion Synthesis of C/MgAl₂O₄ Composite Powders and Their Microstructure Evolution[J]. China's Refractories, 2021, 30(4): 7-11.

Figures/Tables 13

Table 1 Formulations of C/MgAl2O4 powders synthesized by combustion /mass%

Samples	MgO₂	Al₂O₃	Al	MgC₂O₄· 2H₂O
C1	27.27	18.19	27.27	27.27
C2	24.84	21.69	22.98	30.49
C3	22.22	22.22	22.22	33.34

Fig. 1 Combustion front quenching test

Fig. 2 XRD patterns of quenched samples

Fig. 3 Raman spectrum of quenched sample C3

Fig. 4 SEM images of quenched sample C3

Fig. 5 Different zones of quenched sample C3

Fig. 6 XRD patterns of different zones of quenched sample C3

Fig. 7 FESEM photograph of raw material zone of sample C3

Fig. 8 FESEM photographs of preheating zone of quenched sample C3

Table 2 EDS results of points in Fig. 8(c)

Point	Element content /atom%
Point	O	Mg	Al
1	52.61	37.10	10.29
2	52.60	35.25	12.15
3	51.30	45.98	2.72
4	48.82	45.00	6.18

Fig. 9 FESEM photograph of combustion wave front zone of quenched sample C3

Table 3 EDS results of points in Fig. 9

Point	Element content /atom%
Point	O	Mg	Al	C
1	55.47	31.87	12.66	—
2	54.97	26.26	18.77	—
3	50.82	12.12	21.08	15.98
4	46.30	10.20	26.37	23.13

Fig. 10 FESEM photographs of products zone of quenched sample C3

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