低温固相反应法合成片状六铝酸镧

材料导报

2019, Vol. 33

Issue (Z2): 154-157

无机非金属及其复合材料

低温固相反应法合成片状六铝酸镧

万俊, 王周福, 王玺堂, 刘浩, 马妍

武汉科技大学省部共建耐火材料与冶金国家重点实验室,武汉 430081

Synthesis of Platelet-like Lanthanum Hexa-aluminate Powder by Low-temperatureSolid State Reaction Method

WAN Jun, WANG Zhoufu, WANG Xitang, LIU Hao, MA Yan

The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081

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摘要以九水合硝酸铝、六水合硝酸镧为原料,柠檬酸为络合剂,采用低温固相反应法制备出六铝酸镧前驱体,再通过煅烧的方式合成了六铝酸镧粉体。利用FTIR和TG-DSC分析了前驱体的组成和热分解过程,采用XRD、SEM和TEM分析了合成粉体的物相组成和形貌。结果表明:经1 300 ℃煅烧后,六铝酸镧开始形成;随着煅烧温度的升高,六铝酸镧晶体形貌逐渐发育成规则的六方片状;经1 500 ℃煅烧后可获得纯相的六铝酸镧粉体;在1 600 ℃时合成的六铝酸镧粉体粒径呈双峰分布,平均粒径为7.25 μm。

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关键词: 低温固相反应法六铝酸镧晶体双峰分布

Abstract: The lanthanum hexa-aluminate precursor was synthesized by low-temperature solid state reaction using aluminum nitrate nonahydrate and lanthanum nitrate hexahydrate as starting materials, and the citric acid as complex former. Lanthanum hexa-aluminate powders were formed by calcining the precursor. The composition and the thermo-decomposing process of the precursor were investigated by FTIR and TG-DSC. The phase constitution and morphology of as-synthesized powders were characterized by XRD, SEM and TEM. The results show that lanthanum hexa-aluminate crystal begin to form at 1 300 ℃. With the increase of calcination temperature, the morphology of lanthanum hexa-aluminate gra-dually develops into hexagonal platelet structure. Pure lanthanum hexa-aluminate powders can be synthesized at 1 500 ℃. At 1 600 ℃, the ave-rage grain size of as-synthesized lanthanum hexa-aluminate powders are about 7.25 μm,which display a bimodal distribution.

Key words: low temperature solid state reaction lanthanum hexa-aluminate crystal bimodal distribution

出版日期: 2019-11-25 发布日期: 2019-11-25

ZTFLH:

TQ 174.1

基金资助: 国家自然科学基金(51672195;51474166);湖北省自然科学基金创新群体项目(2017CFA004)

通讯作者: whwangzf@126.com

作者简介: 万俊,武汉科技大学硕士研究生,主要研究方向为先进耐火材料设计与制备技术。王周福,武汉科技大学教授,博士研究生导师。其中2007—2008年到英国谢菲尔德大学材料研究所进行访问、合作研究。在国内外学术期刊上发表论文80余篇,申请国家发明专利41项,其中授权22项。其团队主要研究方向包括:高技术陶瓷粉体;耐火材料微结构设计与性能调控;冶炼新技术用耐火材料;先进隔热材料。主持完成科研项目40多项,包括国家“863”项目、国家科技支撑计划等。获国家科技进步二等奖一项,省科技进步一等奖两项、科技进步二等奖三项。已培养博士5名,硕士50余名。

引用本文:

万俊, 王周福, 王玺堂, 刘浩, 马妍. 低温固相反应法合成片状六铝酸镧[J]. 材料导报, 2019, 33(Z2): 154-157.
WAN Jun, WANG Zhoufu, WANG Xitang, LIU Hao, MA Yan. Synthesis of Platelet-like Lanthanum Hexa-aluminate Powder by Low-temperatureSolid State Reaction Method. Materials Reports, 2019, 33(Z2): 154-157.

链接本文:

http://www.mater-rep.com/CN/ 或 http://www.mater-rep.com/CN/Y2019/V33/IZ2/154

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