Effect of particle size distribution on explosive resistance of ρ-Al2O3 bonded corundum based castables

doi:10.3969/j.issn.1001-1935.2021.03.001

Abstract

Abstract:

Effect of aggregates and fine powder contents on the explosive resistance of hydratable alumina bonded corundum castables was investigated with fused white alumina particles and fine (5-3 mm,3-1 mm,≤1 mm and ≤0.074 mm),hydratable alumina (d₅₀=2.4 μm),reactive α-Al₂O₃ micropowder (d₅₀=1.198 μm) and microsilica (d₅₀=0.268 μm) as main raw materials.The mass ratio of aggregates to fine powder was changed from 60:30 to 70:20.The castables were heat treated at 1 400 ℃ for 3 h in air atmosphere.The cold mechanical properties,the air permeability,the pore size distribution and the explosive resistance were tested according to the relevant national standards.The results show that with the aggregate content increasing,the mechanical properties of the specimens after demoulding and drying at 110 ℃ gradually increase,while the cold mechanical properties of the specimens heat treated at 1 400 ℃ gradually decrease,the bulk density increases slightly,and the apparent porosity decreases;the air permeability after demoulding and drying at 110 ℃ increases at first and then decreases,the air permeability and the average pore size of the specimens after heat-treatment at 1 400 ℃ increase gradually; the explosive resistance of specimens increases at first and then decreases after curing at room temperature for 12 h.When the mass ratio of aggregates to fine powder is 68:22,the explosive resistance reaches the best values.

Key words: hydratable alumina, corundum based castables, explosive resistance, air permeability

摘要：

为了研究骨料与细粉含量对水合氧化铝结合刚玉质浇注料抗爆裂性能的影响,以5~3、3~1、≤1和≤0.074 mm的电熔白刚玉颗粒和细粉、d₅₀=2.4 μm的水合氧化铝微粉、d₅₀=1.198 μm的活性α-Al₂O₃微粉、d₅₀=0.268 μm的SiO₂微粉等为主要原料,骨料与细粉的质量比从60:30变为 70:20,制备了ρ-Al₂O₃结合刚玉质浇注料,并在空气气氛中于1 400 ℃保温3 h热处理。按照国家有关标准分别检测其常温力学性能、透气度、孔径分布和抗爆裂性。结果表明:随着骨料含量的增加,试样脱模及110 ℃烘后的力学性能逐渐增加,而 1 400 ℃ 烧后试样的常温力学性能逐渐降低,体积密度略有增加,显气孔率降低;脱模和110 ℃烘后的透气度先增加后降低,经1 400 ℃热处理后的透气度逐渐增加,且烧后试样的平均孔径逐渐增大;在室温养护12 h后,试样的抗爆裂性能则是先增加后降低。在骨料与细粉的质量比为68:22时,抗爆裂性能最好。

关键词: 水合氧化铝, 刚玉质浇注料, 抗爆裂性能, 透气度

CLC Number:

TQ175

Wang Huan, Wang Zhanmin, Feng Haixia, Liu Jun, Cao Yingnan, Xu Yingshun. Effect of particle size distribution on explosive resistance of ρ-Al₂O₃ bonded corundum based castables[J]. Refractories, 2021, 55(3): 185-189.

王欢, 王战民, 冯海霞, 柳军, 曹迎楠, 许应顺. 颗粒组成对ρ-Al₂O₃结合刚玉质浇注料抗爆裂性能的影响[J]. 耐火材料, 2021, 55(3): 185-189.

Figures/Tables 8

Table 1 Chemical composition of starting materials

原料	w/%
原料	Al₂O₃	SiO₂	Fe₂O₃	CaO	K₂O	Na₂O
电熔白刚玉	≥99.4	0.05	0.15			0.2
SiO₂微粉	0.4	≥96.77	0.1	0.2	0.26	0.29
α-Al₂O₃微粉	≥99.38	0.13				0.19

Table 2 Formulations of specimens

原料		w/%
原料		A	B	C	D	E	F
电熔白刚玉	5~3 mm	15	16	17	18	19	20
	3~1 mm	30	30	30	30	30	30
	≤1 mm	15	16	17	18	19	20
	≤0.074 mm	30	28	26	24	22	20
SiO₂微粉		2	2	2	2	2	2
α-Al₂O₃微粉		3	3	3	3	3	3
ρ-Al₂O₃		5	5	5	5	5	5
六偏磷酸钠(外加)		0.2	0.2	0.2	0.2	0.2	0.2
水(外加)		5.3	5.1	4.9	4.8	4.7	4.5

Fig.1 Pore size distribution and cumulative percentage of pore size of specimens with different aggregate contents after heat treatment at 1 400 ℃

Table 3 Air permeability of specimens after demoulding,drying and heat-treatment

项目		A	B	C	D	E	F
透气度×10¹⁵/m²	脱模后	0.10	0.09	0.12	0.22	0.17	0.08
	110 ℃ 保温24 h	0.17	0.16	0.21	0.26	0.23	0.12
	1 400 ℃ 保温3 h	90.78	94.55	98.29	124.87	136.41	164.42

Fig.2 Cold modulus of rupture and cold crushing strength of specimens with different aggregate contents after heat treatment at different temperatures

Fig.3 Bulk density,apparent porosity and linear change rate of specimens with different aggregate contents

Table 4 Anti-explosion test results of specimens with different aggregate contents at different temperatures

炉温/℃	A	B	C	D	E	F
550	××	××	××	××	××	××
500	××	O×	O×	OO	OO	××
450	OO	OO	OO	―	―	OO

Fig.4 Photographs of broken specimens with different aggregate contents after explosive spalling at different temperatures

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Effect of particle size distribution on explosive resistance of ρ-Al₂O₃ bonded corundum based castables

颗粒组成对ρ-Al₂O₃结合刚玉质浇注料抗爆裂性能的影响

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