催化剂种类对低碳MgO-C耐火材料常温性能的影响

doi:10.3969/j.issn.1001-1935.2022.03.004

耐火材料 ›› 2022, Vol. 56 ›› Issue (3): 197-201.DOI: 10.3969/j.issn.1001-1935.2022.03.004

催化剂种类对低碳MgO-C耐火材料常温性能的影响

李亚格¹⁾(), 王军凯²⁾, 段红娟¹⁾, 梁峰¹⁾, 张海军¹⁾()

1)武汉科技大学省部共建耐火材料与冶金国家重点实验室湖北武汉 430081
2)河南理工大学材料科学与工程学院河南省深地材料科学与技术重点实验室河南焦作 454003

收稿日期:2021-07-26 出版日期:2022-06-15 发布日期:2022-06-24
通讯作者: 张海军,男,博士,教授。E-mail: zhanghaijun@wust.edu.cn
作者简介:李亚格:男,1994年生,博士研究生。E-mail: 542631572@qq.com
基金资助:
国家自然科学基金面上资助项目(52072274);国家自然科学基金面上资助项目(51872210);省部共建耐火材料与冶金国家重点实验室开放基金(G201904);河南理工大学博士基金(B2019-40);河南省科技攻关计划(21210221589)

Effect of catalyst types on cold properties of low carbon MgO-C refractories

Li Yage¹⁾(), Wang Junkai²⁾, Duan Hongjuan¹⁾, Liang Feng¹⁾, Zhang Haijun¹⁾()

1)State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,Hubei,China

Received:2021-07-26 Online:2022-06-15 Published:2022-06-24
Contact: Zhang Haijun

摘要/Abstract

摘要：

以电熔镁砂、鳞片石墨和Si粉为原料,以掺入硝酸铁、硝酸钴和硝酸镍的酚醛树脂为结合剂,通过原位催化热解酚醛树脂的方法,在氩气气氛下,分别经800、1 100和1 400 ℃热处理,制备了低碳MgO-C耐火材料。研究了不同催化剂对低碳MgO-C耐火材料常温性能的影响,结果表明:硝酸铁为最佳的催化剂,硝酸铁的引入促进了碳纳米管(CNTs)和SiC晶须的原位生成,提高了耐火材料的力学性能。含硝酸铁的酚醛树脂加入试样时,经1 100 ℃热处理后其常温抗折强度和常温耐压强度最高。

关键词: 低碳MgO-C耐火材料, 碳纳米管, 碳化硅晶须, 力学性能

Abstract:

Low carbon MgO-C refractories were prepared through in-situ catalytic pyrolysis of phenolic resin,using fused magnesia,flake graphite and silicon powders as raw materials,and phenolic resin added with iron nitrate,cobalt nitrate or nickel nitrate as the binder,firing in argon atmosphere at 800,1 100 and 1 400 ℃,respectively.The effects of the catalyst types on the cold properties of the low carbon MgO-C refractories were studied.The results show that iron nitrate is the best catalyst,which promotes the in-situ formation of CNTs and SiC_w and improves the mechanical properties of refractories.With the phenolic resin containing iron nitrate,the sample after heat treatment at 1 100 ℃ has the highest cold modulus of rupture and cold compressive strength.

Key words: low carbon magnesia-carbon refractories, carbon nanotubes, silicon carbide whisker, mechanical properties

中图分类号:

TQ175.75

李亚格, 王军凯, 段红娟, 梁峰, 张海军. 催化剂种类对低碳MgO-C耐火材料常温性能的影响[J]. 耐火材料, 2022, 56(3): 197-201.

Li Yage, Wang Junkai, Duan Hongjuan, Liang Feng, Zhang Haijun. Effect of catalyst types on cold properties of low carbon MgO-C refractories[J]. Refractories, 2022, 56(3): 197-201.

图/表 9

表1 试样配比

Table 1 Composition of samples

原料		加入量(w)/%
	≤1 mm	20
电熔镁砂	3~1 mm	13
	5~3 mm	35
镁砂细粉	≤0.088 mm	25
Si粉	10 μm	3
鳞片石墨	150 μm	4
含有催化剂的酚醛树脂(外加)		4

图1 含不同催化剂的试样热处理后的XRD图谱

Fig.1 XRD patterns of samples fired at different temperatures

图2 含不同催化剂的试样经800 ℃热处理后的SEM图片

Fig.2 SEM images of samples fired at 800 ℃

图3 含不同催化剂的试样经1 100 ℃热处理后的显微结构

Fig.3 SEM images of samples fired at 1 100 ℃

图4 含不同催化剂的试样经1 400 ℃热处理后的显微结构

Fig.4 SEM images of samples fired at 1 400 ℃

表2 不同催化剂制备的试样经200 ℃保温24 h固化后的常温物理性能

Table 2 Physical properties of samples after 24 h curing at 200 ℃

项目	试样C	试样F	试样N	试样W
常温耐压强度/MPa	53.6	49.0	60.5	56.9
常温抗折强度/MPa	7.7	7.6	9.4	8.3
体积密度/(g·cm^-3)	2.85	2.89	3.05	3.10
显气孔率/%	8.3	8.7	7.4	7.6

表3 不同催化剂制备的试样经800 ℃热处理后的常温物理性能

Table 3 Physical properties of samples fired at 800 ℃

项目	试样C	试样F	试样N	试样W
常温耐压强度/MPa	17.7	21.2	21.4	21.5
常温抗折强度/MPa	2.1	2.5	2.4	2.0
体积密度/(g·cm^-3)	2.95	2.95	2.99	3.01
显气孔率/%	14.0	13.5	14.0	12.6
烧后线变化/%	0.14	0.21	0.29	0.21

表4 不同催化剂制备的试样经1 100 ℃热处理后的常温物理性能

Table 4 Physical properties of samples fired at 1 100 ℃

项目	试样C	试样F	试样N	试样W
常温耐压强度/MPa	67.8	69.2	65.8	60.5
常温抗折强度/MPa	8.0	8.8	8.4	8.5
体积密度/(g·cm^-3)	3.03	3.07	3.02	3.10
显气孔率/%	12.7	13.2	12.2	10.7
烧后线变化/%	0.14	0.04	0.07	0.21

表5 不同催化剂制备的试样经1 400 ℃热处理后的常温物理性能

Table 5 Physical properties of samples fired at 1 400 ℃

项目	试样C	试样F	试样N	试样W
常温耐压强度/MPa	69.2	53.1	62.2	47.8
常温抗折强度/MPa	10.9	7.0	9.4	7.7
体积密度/(g·cm^-3)	3.03	3.04	3.03	3.09
显气孔率/%	11.5	11.2	11.5	10.1
烧后线变化/%	0.50	0.43	0.36	0.64

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催化剂种类对低碳MgO-C耐火材料常温性能的影响

Effect of catalyst types on cold properties of low carbon MgO-C refractories

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