SiC惰性氧化对Al2O3-SiO2浇注料线变化率的影响

doi:10.3969/j.issn.1001-1935.2022.03.013

耐火材料 ›› 2022, Vol. 56 ›› Issue (3): 235-240.DOI: 10.3969/j.issn.1001-1935.2022.03.013

SiC惰性氧化对Al₂O₃-SiO₂浇注料线变化率的影响

望伊涛(), 刘国威, 徐威, 张普杰

濮阳濮耐高温材料(集团)股份有限公司河南濮阳 457100

收稿日期:2021-08-16 出版日期:2022-06-15 发布日期:2022-06-24
作者简介:望伊涛:男,1985年生,硕士,工程师。E-mail: wangyitao@punai.com

Effect of inert oxidation of SiC on linear change rate of Al₂O₃-SiO₂ castables

Wang Yitao(), Liu Guowei, Xu Wei, Zhang Pujie

Puyang Refractories Group Co.,Ltd.,Puyang 457100,Henan,China

Received:2021-08-16 Online:2022-06-15 Published:2022-06-24

摘要/Abstract

摘要：

以三级矾土(5~0.088、≤0.088 mm)、特级矾土(1~0.088、≤0.088 mm)、碳化硅(≤0.074 mm)为主要原料,以铝酸钙水泥为结合剂,加入适量的α-Al₂O₃微粉、SiO₂微粉和减水剂制备了Al₂O₃-SiO₂浇注料。对经1 400 ℃空气气氛保温24 h烧后试样的线变化率、显气孔率、化学组成、物相组成和微观结构进行分析,探讨了SiC加入量(w)分别为3%、6%、8%、10%时SiC的惰性氧化对试样线变化率的影响。结果表明:1)SiC惰性氧化产物SiO₂可以填充气孔,降低显气孔率,但SiO₂生成后并不会立即与Al₂O₃发生反应形成莫来石;2)二次莫来石化是试样线变化率提高的主要因素,过量SiC抑制了自身的惰性氧化,氧化产物SiO₂相对减少,不利于试样的烧结以及二次莫来石化的持续进行;3)全组分试样中SiC加入量(w)为6%时,可以使试样在线变化率最大化的同时保持相对均匀的内、外部组织结构。

关键词: SiC, 惰性氧化, Al₂O₃-SiO₂浇注料, 线变化率, 膨胀

Abstract:

Al₂O₃-SiO₂ castables were prepared using three-grade bauxite (5-0.088 and ≤0.088 mm ),special-grade bauxite ( 1-0.088 and ≤0.088 mm ) and silicon carbide (≤0.074 mm ) as main raw materials,calcium aluminate cement as the binder,and adding an appropriate amount of α-Al₂O₃ micropowder,SiO₂ micropowder and water reducing agent.The linear change rate,the apparent porosity,the chemical composition,the phase composition and the microstructure of the samples fired at 1 400 ℃ for 24 h in air atmosphere were analyzed,and the influence of inert oxidation of SiC on the linear change rate of the samples was discussed when the SiC addition was 3%,6%,8% and 10%,by mass,respectively.The results show that:(1)the product SiO₂ of SiC inert oxidation can fill the pores and reduce the apparent porosity,but it does not react with Al₂O₃ to form mullite immediately after formation;(2)secondary mullitization is the main factor for the increase of the linear change rate of the samples;excessive SiC inhibits its own inert oxidation,leading to a relative reduction of the oxidation product SiO₂,which is not conducive to the sintering and the continuous secondary mullitization of the samples;(3)when the SiC addition is 6% in the full-component sample,the sample has the maximum linear change rate,while maintaining relatively uniform microstructures.

Key words: silicon carbide, inert oxidation, alumina-silica castable, linear change rate, expansion

中图分类号:

TQ175.7

望伊涛, 刘国威, 徐威, 张普杰. SiC惰性氧化对Al₂O₃-SiO₂浇注料线变化率的影响[J]. 耐火材料, 2022, 56(3): 235-240.

Wang Yitao, Liu Guowei, Xu Wei, Zhang Pujie. Effect of inert oxidation of SiC on linear change rate of Al₂O₃-SiO₂ castables[J]. Refractories, 2022, 56(3): 235-240.

图/表 10

表1 不同原料的化学组成

Table 1 Chemical composition of raw materials

原料	w/%
原料	Al₂O₃	Fe₂O₃	SiO₂	CaO	TiO₂	SiC	R₂O
三级矾土	61.7	1.3	32.7		2.6		0.7
特级矾土	80.8	2	12.6		3.2		0.4
碳化硅	3.4	2.1				91.1
α-Al₂O₃微粉	98.8
SiO₂微粉			94.7				0.7
铝酸钙水泥	66		1.4	31.3

表2 试样配比

Table 2 Formulations of specimens

原料		w/%
原料		试样SC3	试样SC6	试样SC8	试样SC10	试样SC3M	试样SC6M	试样SC8M	试样SC10M
三级矾土	5~1 mm	40	40	40	40	0	0	0	0
	1~0.088 mm	18	15	13	2	30	25	21.7	3.3
	≤0.088 mm	22	9	0	0	36.7	15	0	0
特级矾土	1~0.088 mm	4	7	9	18	6.6	11.6	15	30
特级矾土	≤0.088 mm	0	10	17	17	0	16.7	28.3	28.3
碳化硅	≤0.074 mm	3	6	8	10	5	10	13.3	16.7
α-Al₂O₃微粉+SiO₂微粉		10	10	10	10	16.7	16.7	16.7	16.7
铝酸钙水泥		3	3	3	3	5	5	5	5
外加剂(外加)		0.26	0.26	0.26	0.26	0.43	0.43	0.43	0.43

图1 SiC加入量对试样线变化率的影响

Fig.1 Effect of SiC addition on linear change rate of specimens

图2 全组分试样烧后横截面照片

Fig.2 Cross section of fired full-component specimens

图3 基质试样烧后横截面照片

Fig.3 Cross section of fired matrix specimens

表3 烧后试样内、外部区域SiO2含量、SiC残余量和显气孔率

Table 3 Apparent porosity,SiO2 content and residue SiC content of interior/exterior zone in fired specimens

试样编号	内部区域			外部区域			内外部SiO₂含量、SiC残余量差的绝对值(w)/%
	w/%		显气孔率/%	w/%		显气孔率/%	SiO₂	SiC
	SiO₂	SiC	显气孔率/%	SiO₂	SiC	显气孔率/%	SiO₂	SiC
SC3	33.4	0	22.6	33.2	0	24.0	0.2	0
SC6	33.4	0	19.4	33.5	0	20.9	0.1	0
SC8	32.3	0.67	18.1	33.4	0	17.1	1.1	0.7
SC10	28.4	3.5	21.6	33.2	0	15.2	4.8	3.5
SC3M	33.1	0	28.6	33.4	0	29.1	0.3	0
SC6M	33.2	0	23.1	33.6	0	22.9	0.4	0
SC8M	25.5	5.51	28.0	31.1	1.5	17.9	5.6	4.0
SC10M	21.7	8.08	28.6	28.9	3	19.6	7.1	5.1

图4 全组分试样烧后内外部区域的XRD图谱

Fig.4 XRD patterns of interior/exterior zone in fired full-component specimens

图5 基质试样烧后内外部区域的XRD图谱

Fig.5 XRD patterns of interior/exterior zone in fired matrix specimens

图6 全组分试样SC6、试样SC10烧后内、外部区域的SEM照片

Fig.6 SEM images of interior/exterior zone in fired full-component specimens (SC6、SC10)

图7 全组分试样SC6、试样SC10烧后外部区域的放大照片

Fig.7 Enlarged SEM images of exterior zone in fired full-component specimens (SC6、SC10)

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SiC惰性氧化对Al₂O₃-SiO₂浇注料线变化率的影响

Effect of inert oxidation of SiC on linear change rate of Al₂O₃-SiO₂ castables

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