Y_(2)Si_(2)O_(7)增强SiC质耐火材料抗高温水蒸气腐蚀性能研究  

High-temperature water vapor corrosion resistance of Y_(2)Si_(2)O_(7) reinforced SiC based refractories

作　　者：薛海涛[1] 刘星宇 陈定[2,3] 顾华志 李少飞[3] 黄奥 付绿平[2] 伍书军 Xue Haitao;Liu Xingyu;Chen Ding;Gu Huazhi;Li Shaofei;Huang Ao;Fu Lyuping;Wu Shujun(Wuhan Metallurgical Construction Research Institute Co.,Ltd.of MCC,Wuhan 430081,Hubei,China;不详)

机构地区：[1]中冶武汉冶金建筑研究院有限公司,湖北武汉430081 [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 [3]新疆兵团化工绿色过程重点实验室,新疆石河子832000

出　　处：《耐火材料》2025年第1期8-12,共5页Refractories

基　　金：国家自然科学基金面上项目(52172023);新疆兵团化工绿色过程重点实验室开放基金(KF202401)。

摘　　要：为解决高温水蒸气对垃圾焚烧炉用SiC质耐火材料产生的严重腐蚀,以SiC颗粒和细粉为主原料,硅溶胶为结合剂,Y_(2)O_(3)粉为添加剂,在150 MPa的压力下压制成140 mm×25 mm×25 mm的长条试样,经1 400℃保温3 h烧成制备Y_(2)Si_(2)O_(7)增强SiC质耐火材料,再经1 000℃保温100 h水蒸气腐蚀。研究Y_(2)O_(3)粉的添加量(添加质量分数分别为0、1.5%、3.0%、4.5%)对烧后试样和水蒸气腐蚀后试样的性能、物相组成和显微结构的影响。结果表明:添加Y_(2)O_(3)会造成烧后SiC质耐火材料的显气孔率上升,常温抗折强度下降;但是随着Y_(2)O_(3)添加量的增加,经1 000℃保温100 h水蒸气腐蚀后试样的体积密度和常温抗折强度增加,水冷热震5次后的常温抗折强度增加,因为1 400℃高温烧成过程中Y_(2)O_(3)和SiO_(2)原位反应生成Y_(2)Si_(2)O_(7)增强相,其与SiC基体结合紧密,且Y_(2)Si_(2)O_(7)在高温水蒸气条件下稳定性好,与SiC基体热膨胀系数接近,能够提高SiC质耐火材料的抗高温水蒸气腐蚀性能。To solve the serious high-temperature water vapor corrosion of SiC based refractories used in waste incinerators,SiC particles and powders were adopted as main raw materials,silica sol as the binder,and Y_(2)O_(3) as the additive to prepare strip samples of 140 mm×25 mm×25 mm under the pressure of 150 MPa.The strip samples were fired at 1 400 ℃ for 3 h to fabricate Y_(2)Si_(2)O_(7) reinforced SiC based refractories,and then the SiC based refractories were corroded under a water vapor atmosphere at 1 000 ℃ for 100 h.The effect of the Y_(2)O_(3) addition(0,1.5%,3.0%,4.5%,by mass) on properties,phase composition,microstructure of the fired and water vapor corroded samples were investigated.The results show that:the addition of Y_(2)O_(3) increases the apparent porosity of SiC based refractories and decreases the cold modulus of rupture;however,with the increase of the Y_(2)O_(3) addition,the bulk density and cold modulus of rupture of the samples after water vapor corrosion at 1 000 ℃ for 100 h increase,and the cold modulus of rupture increases after 5 water-cooled thermal shock cycles.This is because of the enhanced phase Y_(2)Si_(2)O_(7) formed by the in-situ reaction between Y_(2)O_(3) and SiO_(2) during firing at 1 400 ℃.It tightly bonds with SiC matrix,performs good stability in high-temperature water vapor,and has an approximate thermal expansion coefficient to SiC,which can improve the high-temperature water vapor corrosion resistance of the SiC based refractories.

关 键 词：SiC质耐火材料 Y_(2)Si_(2)O_(7) 水蒸气腐蚀 抗热震性 

分 类 号：TQ175[化学工程—硅酸盐工业]