硝酸铁负载方式对氮化制备Si_(3)N_(4)复合MgO-C材料的影响  

Effect of ferric nitrate loading mode on properties of Si_(3)N_(4) composite MgO-C refractories prepared by nitridation

作　　者：陈洋 邓承继[2] 丁军[2] 余超[2] 娄晓明[1] 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;不详)

机构地区：[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

出　　处：《耐火材料》2022年第6期477-480,共4页Refractories

基　　金：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);湖南省教育厅重点项目(18A428)联合资助。

摘　　要：为了探明催化剂负载方式对氮化制备Si_(3)N_(4)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Si_(3)N_(4)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Si_(3)N_(4)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-Si_(3)N_(4)参与反应生成β-Si_(3)N_(4)和MgSiN_(2),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。In order to investigate the effect of the catalyst loading mode on the mechanical properties of Si_(3)N_(4) 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 Si_(3)N_(4) 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-Si_(3)N_(4) in the reaction to generate β-Si_(3)N_(4) and MgSiN_(2),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.

关 键 词：MGO-C耐火材料 催化剂载体 Si_(3)N_(4) 力学性能 

分 类 号：TQ175[化学工程—硅酸盐工业]