发泡法制备镁铝尖晶石空心球隔热材料

doi:10.3969/j.issn.1001-1935.2022.02.005

耐火材料 ›› 2022, Vol. 56 ›› Issue (2): 117-122.DOI: 10.3969/j.issn.1001-1935.2022.02.005

发泡法制备镁铝尖晶石空心球隔热材料

任威力(), 杨道媛(), 王瑞, 江桥, 付延旭, 刘皓

郑州大学材料科学与工程学院河南郑州 450001

收稿日期:2021-05-25 出版日期:2022-04-15 发布日期:2022-04-21
通讯作者: 杨道媛,女,1968年生,博士,教授。E-mail: 873906048@qq.com
作者简介:任威力:男,1996年生,硕士研究生。E-mail: 1537660454@qq.com
基金资助:
国家自然科学基金资助项目(51372229);科技部国家重点研发专项资助项目(2017YFB0310701);河南省科技创新杰出人才基金资助项目(17420051001);郑州市“智汇郑州”急需紧缺人才基金(第二批)资助项目;郑州市重大专项资助项目(2019CXZX0066)

Preparation of magnesium aluminate spinel hollow sphere heat insulation refractories by foaming method

Ren Weili(), Yang Daoyuan(), Wang Rui, Jiang Qiao, Fu Yanxu, Liu Hao

School of Materials Science and Engineering,Zhengzhou University,Zhengzhou 450001,Henan,China

Received:2021-05-25 Online:2022-04-15 Published:2022-04-21
Contact: Yang Daoyuan

摘要/Abstract

摘要：

以粒度分别为0.6~0.9和0.5~0.6 mm的镁铝尖晶石空心球以及d₅₀=2.38 μm 的Al₂O₃微粉为主要原料,氧化铝溶胶为结合剂,十二烷基硫酸钠为发泡剂,十二醇和羧甲基纤维素钠为稳泡剂,采用发泡法制备镁铝尖晶石空心球隔热材料,主要研究了镁铝尖晶石空心球粒度级配和氧化铝溶胶加入量对烧后试样致密度、强度、烧后线收缩率、重烧线变化、热导率、物相组成和显微结构等的影响。结果表明:1)随着0.5~0.6 mm空心球加入比例的增大,试样的显气孔率和烧后线收缩率逐渐减小,体积密度、重烧线变化、常温耐压强度和热导率逐渐增大。2)0.6~0.9 mm空心球加入量为0,0.5~0.6 mm空心球加入量为60%(w),每100 g主料中氧化铝溶胶加入量为13.972 7 g时,试样的体积密度为1.13 g·cm^-3,常温耐压强度为19.3 MPa,1 600 ℃保温3 h重烧线变化率为0.22%,1 200 ℃的热导率为0.517 W·m^-1·K^-1。3)随着氧化铝溶胶加入量的增加,试样的显气孔率和烧后线收缩率逐渐增大,体积密度、重烧线变化和常温耐压强度逐渐减小。4)0.5~0.6 mm空心球加入量为60%(w),每100 g主料中氧化铝溶胶加入量为16.188 7 g时,试样的显气孔率为69.7%,常温耐压强度为7.1 MPa,1 600 ℃保温3 h条件下的重烧线变化率为0.05%。

关键词: 发泡法, 隔热材料, 多孔材料, 镁铝尖晶石, 空心球

Abstract:

Magnesium aluminate spinel hollow sphere heat insulation refractories were prepared by the foaming method using magnesium aluminate spinel hollow spheres (0.6-0.9 and 0.5-0.6 mm) and alumina micropowder (d₅₀=2.38 μm) as main starting materials,alumina sol as the binder,sodium lauryl sulfate as the foaming agent,sodium carboxymethyl cellulose and lauryl alcohol as the foam stabilizer.The effects of the particle size distribution of magnesium aluminate spinel hollow spheres and the alumina sol addition on the bulk density,the strength,the linear change after heating,the linear change on reheating,the thermal conductivity,the phase composition and the microstructure of the specimens were mainly studied.The results show that:(1)with the increasing addition of the 0.5-0.6 mm hollow spheres,the apparent porosity and the linear shrinkage after heating of the specimens gradually decrease,the bulk density,the linear change on reheating,the cold crushing strength and the thermal conductivity gradually increase;(2)when the 0.6-0.9 mm hollow spheres addition is 0,the 0.5-0.6 mm hollow spheres addition is 60 mass% and alumina sol addition is 13.972 7 g per 100 g of the main starting materials,the bulk density of the specimen is 1.13 g·cm^-3,the cold crushing strength is 19.3 MPa,and the linear change on reheating (1 600 ℃×3 h) is 0.22%,the thermal conductivity at 1 200 ℃ is 0.517 W·m^-1·K^-1;(3) with the increase of the alumina sol addition,the apparent porosity and the linear shrinkage after heating of the specimens gradually increase,and the bulk density,the linear change on reheating and the cold crushing strength gradually decrease;(4)when the 0.5-0.6 mm hollow spheres addition is 60 mass% and the alumina sol addition is 16.188 7 g per 100 g of the main starting materials,the apparent porosity is 69.7%,the cold crushing strength is 7.1 MPa,and the linear change on reheating (1 600 ℃×3 h) is 0.05%.

Key words: foaming method, heat insulation refractories, porous materials, magnesium aluminate spinel, hollow sphere

中图分类号:

TQ175.7

任威力, 杨道媛, 王瑞, 江桥, 付延旭, 刘皓. 发泡法制备镁铝尖晶石空心球隔热材料[J]. 耐火材料, 2022, 56(2): 117-122.

Ren Weili, Yang Daoyuan, Wang Rui, Jiang Qiao, Fu Yanxu, Liu Hao. Preparation of magnesium aluminate spinel hollow sphere heat insulation refractories by foaming method[J]. Refractories, 2022, 56(2): 117-122.

图/表 7

表1 试样配比

Table 1 Experimental formulations

原料	m/g
原料	A20	A30	A40	A50	A60	B1	B2	B3	B4	B5
0.6~0.9 mm的MA空心球	40	30	20	10	0	0	0	0	0	0
0.5~0.6 mm的MA空心球	20	30	40	50	60	60	60	60	60	60
Al₂O₃微粉	40	40	40	40	40	40	40	40	40	40
十二烷基硫酸钠	0.014	0.014	0.014	0.014	0.014	0.014	0.014	0.014	0.014	0.014
十二醇	0.017 2	0.017 2	0.017 2	0.017 2	0.017 2	0.017 2	0.017 2	0.017 2	0.017 2	0.017 2
羧甲基纤维素钠	0.025 7	0.025 7	0.025 7	0.025 7	0.025 7	0.025 7	0.025 7	0.025 7	0.025 7	0.025 7
氧化铝溶胶	13.972 7	13.972 7	13.972 7	13.972 7	13.972 7	13.972 7	14.526 7	15.080 7	15.634 7	16.188 7
水	7.984 4	7.984 4	7.984 4	7.984 4	7.984 4	7.984 4	8.300 4	8.616 4	8.932 4	9.248 4

图1 不同空心球颗粒级配试样的XRD图谱

Fig.1 XRD patterns of samples prepared with hollow spheres of different particle size distributions

图2 空心球颗粒级配不同的试样截面的SEM照片

Fig.2 Cross-section SEM images of samples prepared with hollow spheres of different particle size distributions

图3 空心球颗粒级配不同的试样的各项性能

Fig.3 Properties of samples prepared with hollow spheres of different particle size distributions

图4 氧化铝溶胶加入量不同的试样的XRD图谱

Fig.4 XRD patterns of samples prepared with different alumina sol additions

图5 氧化铝溶胶加入量不同的试样截面的SEM照片

Fig.5 Cross-section SEM images of samples prepared with different alumina sol additions

图6 氧化铝溶胶加入量不同试样的各项性能

Fig.6 Properties of samples with different alumina sol additions

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发泡法制备镁铝尖晶石空心球隔热材料

Preparation of magnesium aluminate spinel hollow sphere heat insulation refractories by foaming method

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