工业炭黑加入量对复相结合碳化硅耐火材料性能的影响  

Effect of industrial carbon black addition on properties of multiphase bonded silicon carbide refractories

作　　者：常赪[1] 吕春江[1] 龚剑锋[1] 黄一飞 马昭阳 刘臻[1] Chang Cheng;Lyu Chunjiang;Gong Jianfeng;Huang Yifei;Ma Zhaoyang;Liu Zhen(Sinosteel Luoyang Institute of Refractories Research Co.,Ltd.,Luoyang 471039,Henan,China)

机构地区：[1]中钢集团洛阳耐火材料研究院有限公司先进耐火材料国家重点实验室,河南洛阳471039

出　　处：《耐火材料》2023年第5期412-416,共5页Refractories

摘　　要：为研究工业炭黑对复相结合碳化硅耐火材料性能的影响,以碳化硅颗粒(3~1、1~0.088 mm)与细粉(<0.088 mm)、硅粉(<0.088 mm)、工业炭黑(牌号N990)、SiO2微粉(d_(50)=0.26μm)和ρ-Al_(2)O_(3)微粉(d_(50)=6.0μm)等为主要原料,采用预制浇注成型,在氮气气氛中于1400℃热处理,制备了复相结合碳化硅试样。研究了N990加入量(w)分别为2.5%、3.0%、3.5%时试样的物理性能、物相组成与显微结构。结果表明:1)随N990加入量的增加,泥料的流动性改善,脱模强度及干燥强度提高。2)随N990加入量的增加,氮化后试样的显气孔率升高,体积密度和抗折强度均有下降,试样中游离C含量升高,α-Si_(3)N_(4)减少。3)随N990加入量的增加,因炭黑颗粒团聚的概率增加,氮化处理后试样显微结构的均匀性变差。Si-C和Si-N发生反应烧结,除连续的絮状基质外,局部还出现了致密孤岛状的β-SiC或O′-SiAlON相。综合分析认为,炭黑加入量(w)为3.0%的试样更能满足材料制备和性能的需要。In order to study the effect of industrial carbon black on properties of multiphase bonded silicon carbide refractories,the samples were prepared using silicon carbide particles(3-1 and 1-0.088 mm)and fine powder(<0.088 mm),silicon powder(<0.088 mm),industrial carbon black(N990),microsilica(d_(50)=0.26μm)andρ-Al_(2)O_(3)micropowder(d_(50)=6.0μm)as the main raw materials,casting molding and heat treating at 1400℃in nitrogen atmosphere.The physical properties,phase composition and microstructure of samples with N990 additions of 2.5%,3.0%,and 3.5%by mass were analyzed and compared.The results show that:(1)with N990 addition increasing,the flowability of the casting mud is improved,the demoulding and drying strengths are increased;(2)with the increase of N990 addition,the apparent porosity of the nitridized material increases,the bulk density and modulus of rupture both decrease,the content of free carbon increases,and theα-Si_(3)N_(4)content decreases;(3)with the increase of N990 addition,because the particles agglomerating probability of carbon black increases,the uniformity of the samples become worse after nitridizing.Reaction sintering occurs between Si-C and Si-N,in addition to the continuous flocculent matrix,dense island-likeβ-SiC or O’-SiAlON phases also appear locally.It is thought after comprehensive analysis that the sample with 3.0%carbon black addition can better meet the need of material preparation and properties.

关 键 词：工业炭黑 复相结合碳化硅 浇注成型 显微结构 

分 类 号：TQ75[化学工程]