Effect of ZnO-precursors on properties of calcium aluminate cement bonded corundum based castables

doi:10.3969/j.issn.1001-1935.2021.05.015

Refractories ›› 2021, Vol. 55 ›› Issue (5): 444-447.DOI: 10.3969/j.issn.1001-1935.2021.05.015

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Effect of ZnO-precursors on properties of calcium aluminate cement bonded corundum based castables

Guo Liu(), Zhao Zongqiang, Ma Junhua, Chen Liugang()

Henan Key laboratory of High Temperature Functional Ceramics,School of Materials Science and Engineering,Zhengzhou University,Zhengzhou 450052,Henan,China

Received:2021-07-31 Online:2021-10-15 Published:2021-10-25
Contact: Chen Liugang

ZnO前驱体对铝酸钙水泥结合刚玉质浇注料性能的影响

郭柳(), 赵宗强, 马俊花, 陈留刚()

郑州大学材料科学与工程学院河南省高温功能材料重点实验室河南郑州 450052

通讯作者: 陈留刚
作者简介:郭柳:女,1997年生,硕士研究生。E-mail: 1015011940@qq.com
基金资助:
国家自然科学基金资助项目(51802287);先进耐火材料国家重点实验室开放基金(SKLAR202005)

Abstract

Abstract:

Calcium aluminate cement (CAC) bonded corundum based castables were prepared using tabular corundum and activated alumina as the starting materials,CAC as the binder,zinc hydroxide (Zn(OH)₂) and basic zinc carbonate (BZC) as the ZnO precursors.The effects of the two ZnO precursors on the phase composition and microstructure of the CAC bonded corundum based castable matrix were analyzed,and the reasons affecting the hot performance of the castables were studied.The results show that Zn(OH)₂ with a smaller particle size (d₅₀=1.26 μm) is prone to agglomerate during sample preparation and generates ZnAl₂O₄ spinel grains after firing,hindering the growth of CA₆,thus decreasing the mechanical strength of the castables.BZC with a larger particle size (d₅₀=2.91 μm),which shows a sound dispersity,in-situ generates nano-sized ZnO after firing,and ZnO or Zn²⁺ diffuses into calcium aluminates,promoting the sintering of CA₂ and CA₆,there by enhancing the hot properties of the CAC-bonded corundum based castables.

Key words: calcium aluminate cement, corundum based castables, zinc hydroxide, basic zinc carbonate, zinc oxide, hot properties

摘要：

以板状刚玉、活性氧化铝为原料,铝酸钙水泥(CAC)为结合剂,选取氢氧化锌和碱式碳酸锌两种ZnO前驱体,制备了CAC结合刚玉质试样,研究了两种前驱体对CAC结合刚玉质浇注料基质的相组成和显微结构的影响,分析了影响浇注料高温性能的原因。结果表明:粒度较小的氢氧化锌(d₅₀=1.26 μm)在试样制备过程中容易发生团聚,热处理后生成颗粒状的锌铝尖晶石,阻碍了CA₆的生长,降低了浇注料的强度;粒度较大的碱式碳酸锌(d₅₀=2.91 μm),分散性较好,浇注料经热处理后,碱式碳酸锌生成原位纳米级ZnO,ZnO或Zn²⁺扩散入铝酸钙相中,促进了CA₂之间和CA₆之间的烧结,显著提高了CAC结合刚玉质浇注料的高温性能。

关键词: 铝酸钙水泥, 刚玉质浇注料, 氢氧化锌, 碱式碳酸锌, ZnO, 高温性能

CLC Number:

TQ175

Guo Liu, Zhao Zongqiang, Ma Junhua, Chen Liugang. Effect of ZnO-precursors on properties of calcium aluminate cement bonded corundum based castables[J]. Refractories, 2021, 55(5): 444-447.

郭柳, 赵宗强, 马俊花, 陈留刚. ZnO前驱体对铝酸钙水泥结合刚玉质浇注料性能的影响[J]. 耐火材料, 2021, 55(5): 444-447.

Figures/Tables 6

References 13

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原料		w/%
原料		CZ0	CZ1-0.3	CZ1-0.45	CZ1-0.6	CZ2-0.33	CZ2-0.5	CZ2-0.66
板状刚玉	6~3、3~1、1~0.5、≤0.5 mm	73	73	73	73	73	73	73
板状刚玉	≤0.045 mm	14	13.7	13.55	13.4	13.67	13.5	13.34
活性氧化铝	CL370	8	8	8	8	8	8	8
CAC		5	5	5	5	5	5	5
氢氧化锌		0	0.3	0.45	0.6	0	0	0
碱式碳酸锌(BZC)		0	0	0	0	0.33	0.5	0.66
FS10(外加)		0.15	0.15	0.15	0.15	0.15	0.15	0.15
加水量(外加)		4.2	4.2	4.2	4.2	4.2	4.2	4.2

原料		w/%
原料		CZ0	CZ1-0.3	CZ1-0.45	CZ1-0.6	CZ2-0.33	CZ2-0.5	CZ2-0.66
板状刚玉	6~3、3~1、1~0.5、≤0.5 mm	73	73	73	73	73	73	73
板状刚玉	≤0.045 mm	14	13.7	13.55	13.4	13.67	13.5	13.34
活性氧化铝	CL370	8	8	8	8	8	8	8
CAC		5	5	5	5	5	5	5
氢氧化锌		0	0.3	0.45	0.6	0	0	0
碱式碳酸锌(BZC)		0	0	0	0	0.33	0.5	0.66
FS10(外加)		0.15	0.15	0.15	0.15	0.15	0.15	0.15
加水量(外加)		4.2	4.2	4.2	4.2	4.2	4.2	4.2

Effect of ZnO-precursors on properties of calcium aluminate cement bonded corundum based castables

ZnO前驱体对铝酸钙水泥结合刚玉质浇注料性能的影响

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