硝酸铁负载方式对氮化制备Si3N4复合MgO-C材料的影响

doi:10.3969/j.issn.1001-1935.2022.06.004

耐火材料 ›› 2022, Vol. 56 ›› Issue (6): 477-480.DOI: 10.3969/j.issn.1001-1935.2022.06.004

硝酸铁负载方式对氮化制备Si₃N₄复合MgO-C材料的影响

陈洋^1,2), 邓承继²⁾, 丁军²⁾, 余超²⁾, 娄晓明¹⁾

1)湖南工学院新型建筑材料研究院湖南衡阳 421002
2)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

收稿日期:2021-01-13 出版日期:2022-12-15 发布日期:2022-12-26
作者简介:陈洋:男,1992年生,博士。E-mail:chenyang_9210@163.com
基金资助:
国家自然科学基金区域创新发展联合基金(U20A20239);湖北省自然科学基金面上项目(2020CFB692)和湖南省教育厅重点项目(18A428)联合资助。

Effect of ferric nitrate loading mode on properties of Si₃N₄ composite MgO-C refractories prepared by nitridation

Chen Yang, Deng Chengji, Ding Jun, Yu Chao, Lou Xiaoming

Research Institute of New Building Materials,Hunan Institute of Technology,Heng-yang 421002,Hunan,China

Received:2021-01-13 Online:2022-12-15 Published:2022-12-26

摘要/Abstract

摘要： 为了探明催化剂负载方式对氮化制备Si₃N₄复合MgO-C耐火材料力学性能的影响,以电熔镁砂、鳞片石墨、硅粉、酚醛树脂为主要原料,以硝酸铁为催化剂,经1 350 ℃氮化制备了Si₃N₄复合MgO-C耐火材料,研究了不同催化剂载体(硅粉、硅粉+酚醛树脂)对MgO-C耐火材料中Si₃N₄的形成和材料性能的影响。结果表明:采用硅粉+酚醛树脂为催化剂载体,会促进α-Si₃N₄参与反应生成β-Si₃N₄和MgSiN₂,并提高SiC生成量,但这种负载方式会导致试样内部产生较多气体而逸出,材料结构变得疏松,降低了材料的力学性能;相同条件下硅粉负载催化剂氮化制备MgO-C耐火材料显示出更高的致密度和力学性能。

关键词: MgO-C耐火材料, 催化剂载体, Si₃N₄, 力学性能

Abstract: In order to investigate the effect of the catalyst loading mode on the mechanical properties of Si₃N₄ composite MgO-C refractories prepared by nitridation,fused magnesia,flake graphite,silicon powder,and phenolic resin were used as the main raw materials,and ferric nitrate as the catalyst to prepare refractories by nitriding at 1 350 ℃.The effects of different catalyst supports (silicon powder,silicon powder+phenolic resin) on the formation of Si₃N₄ in MgO-C refractories and the properties of refractories were studied.The results show that the silicon powder+phenolic resin catalyst support promotes the participation of α-Si₃N₄ in the reaction to generate β-Si₃N₄ and MgSiN₂,and generates more SiC.However,this loading mode causes more gas to escape from the refractories and loosens the material structure,which reduces the mechanical properties.On the contrary,MgO-C refractories prepared by nitridation with silicon powder-supported catalysts under the same conditions show higher density and better mechanical properties.

Key words: magnesia-carbon refractories, catalyst support, silicon nitride, mechanical properties

中图分类号:

TQ175

陈洋, 邓承继, 丁军, 余超, 娄晓明. 硝酸铁负载方式对氮化制备Si₃N₄复合MgO-C材料的影响[J]. 耐火材料, 2022, 56(6): 477-480.

Chen Yang, Deng Chengji, Ding Jun, Yu Chao, Lou Xiaoming. Effect of ferric nitrate loading mode on properties of Si₃N₄ composite MgO-C refractories prepared by nitridation[J]. Refractories, 2022, 56(6): 477-480.

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硝酸铁负载方式对氮化制备Si₃N₄复合MgO-C材料的影响

Effect of ferric nitrate loading mode on properties of Si₃N₄ composite MgO-C refractories prepared by nitridation

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