Combustion synthesis of C/MgAl2O4 composite powders and their microstructure evolution

doi:10.3969/j.issn.1001-1935.2021.05.007

Refractories ›› 2021, Vol. 55 ›› Issue (5): 405-409.DOI: 10.3969/j.issn.1001-1935.2021.05.007

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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,Shanxi,China

Received:2021-07-13 Online:2021-10-15 Published:2021-10-25
Contact: Xiao Guoqing

燃烧合成C/MgAl₂O₄复合粉及其显微结构演变

吕李华¹⁾^,²⁾(), 丁冬海²⁾, 肖国庆²⁾()

1) 山西工程技术学院土木与建筑工程系山西阳泉 045000
2) 西安建筑科技大学材料科学与工程学院陕西西安 710043

通讯作者: 肖国庆
作者简介:吕李华:女,1986年生,博士研究生,讲师。E-mail: hjllh1986@126.com
基金资助:
国家自然科学基金项目(51772236);陕西省重点研发计划项目(2018ZDXM-GY-128)

Abstract

Abstract:

This work aims at solving the problems of difficult dispersion,easy oxidation and high cost of nano carbon during application.C/MgAl₂O₄ composite powders were synthesized using MgC₂O₄,MgO₂,Al₂O₃ powder,and Al powder as raw materials by combustion synthesis.The results indicate that the with the maximum MgC₂O₄ 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 is generated from the 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

摘要：

为解决纳米碳在应用过程中难分散、易氧化、成本高等问题,以草酸镁(MgC₂O₄)、过氧化镁、Al₂O₃粉和Al粉为原料,燃烧合成碳/镁铝尖晶石(C/MgAl₂O₄)复合粉。结果表明,当MgC₂O₄的最大掺量是33.34%(w)时,C/MgAl₂O₄复合粉中碳含量为1.17%(w),碳夹杂于尖晶石晶粒间。复合粉中镁铝尖晶石具有粒状及棒状两种形貌。粒状镁铝尖晶石由MgO与Al₂O₃相互扩散形成,棒状镁铝尖晶石由Mg蒸气与原料Al₂O₃以气-固生长机制主导形成。

关键词: C/MgAl₂O₄复合粉, 燃烧合成法, 燃烧波淬熄技术, 显微结构演变

CLC Number:

TQ175

Lyu Lihua, Ding Donghai, Xiao Guoqing. Combustion synthesis of C/MgAl₂O₄ composite powders and their microstructure evolution[J]. Refractories, 2021, 55(5): 405-409.

吕李华, 丁冬海, 肖国庆. 燃烧合成C/MgAl₂O₄复合粉及其显微结构演变[J]. 耐火材料, 2021, 55(5): 405-409.

Figures/Tables 13

Table 1 Formulations of C/MgAl2O4 powder synthesized by combustion

试样编号	w/%
试样编号	过氧化镁	Al₂O₃粉	Al粉	草酸镁
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 in quenched sample C3

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

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

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

区域	x/%
区域	O	Mg	Al
点1	52.61	37.10	10.29
点2	52.60	35.25	12.15
点3	51.30	45.98	2.72
点4	48.82	45.00	6.18

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

Table 3 EDS results of points in Fig.9

区域	x/%
区域	O	Mg	Al	C
点1	55.47	31.87	12.66	—
点2	54.97	26.26	18.77	—
点3	50.82	12.12	21.08	15.98
点4	46.30	10.20	26.37	23.13

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

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