纳米TiO_(2)加入量对镁钙砂性能的影响  

Influence of nano TiO_(2) addition on properties of magnesia-calcia clinkers

作　　者：臧伟楠 栾舰 王春艳 李佳 韩昊鹏 Zang Weinan;Luan Jian;Wang Chun-yan;Li Jia;Han Haopeng(School of Materials and Metallurgy,University of Science and Technology Liaoning,Anshan 114051,Liaoning,China;不详)

机构地区：[1]辽宁科技大学材料与冶金学院,辽宁鞍山114051

出　　处：《耐火材料》2025年第1期45-49,共5页Refractories

基　　金：辽宁省教育厅一般项目(LJKFZ20220196)。

摘　　要：为了改善镁钙材料的抗水化性能并进一步提高其他性能,以白云石粉和轻烧镁粉为主要原料,外加纳米TiO_(2),以酚醛树脂为结合剂,在100 MPa下成型,经1 650℃煅烧3 h制成镁钙砂试样,研究了TiO_(2)外加量(外加质量分数分别为0、2%、4%、6%和8%)对其性能的影响。结果表明:纳米TiO_(2)的引入可使材料内产生固溶体,促进晶粒长大,同时材料内会有新相CaTiO_(3)和Ca_(4)Ti_(3)O_(10)生成,提高颗粒间结合程度,但过量的新相生成会阻碍材料内气体排出,影响烧结过程。随着纳米TiO_(2)外加量的增加,试样中CaTiO_(3)和Ca_(4)Ti_(3)O_(10)的含量增加,体积密度逐渐降低,显气孔率逐渐增大,常温抗折强度、常温耐压强度和抗水化性能以及热震后的常温抗折强度先增大后减小。当纳米TiO_(2)外加量为2%(w)时,试样的强度、抗热震性和抗水化性能最高。In order to improve the hydration resistance of magnesia-calcia materials and further enhance other properties,magnesia-calcia clinker samples were prepared using dolomite powder and light-burned magnesia powder as the main raw materials,phenolic resin as the binder,extra adding nano TiO_(2),molding at 100 MPa,and calcining at 1 650 ℃ for 3 h.Effect of TiO_(2) additions(0,2%,4%,6%,and 8%,by mass) on the properties of the samples was investigated.The results show that the introduction of nano TiO_(2) can generate solid solution in the materials and promote grains growth,while new phases CaTiO_(3) and Ca_(4)Ti_3O_(10) are generated to improve the bonding degree of particles;but the excessive generation of the new phases will hinder the gas discharge in the materials and affect the sintering process.With the increase of the nano TiO_(2) addition,the content of CaTiO_(3) and Ca_(4)Ti_3O_(10) in the samples increases,the bulk density decreases gradually,the apparent porosity increases,and the cold modulus of rupture,the cold crushing strength and the hydration resistance,as well as the cold modulus of rupture after thermal shock firstly increase and then decrease.The strength,the thermal shock resistance and the hydration resistance of the samples are the highest when the nano TiO_(2) addition is 2%.

关 键 词：镁钙材料 纳米TiO_(2) 力学性能 抗水化性 

分 类 号：TQ175[化学工程—硅酸盐工业]