-利用高铝粉煤灰合成堇青石陶瓷材料的制备研究本科学位论文.doc

第页利用高铝粉煤灰合成堇青石陶瓷材料的制备研究专业：材料科学与工程学生：张政指导老师：马立建摘要利用高铝粉煤灰（Al2O337.22%、SiO246%）为主要原料制备堇青石，添加适量的镁砂工业烧结镁砂（MgO98.2%），以及少量的硅微粉（SiO296%），按照堇青石的理论配方（MgO13.8%,Al2O334.9%,SiO251.3%）进行配比。试样通过压力成型机进行压制成型，成型压力为120MPa。烧结试样分别在1150℃,1200℃,1250℃,1270℃,1290℃,1310℃六个温度下进行。烧结试样删除通过对烧结试样的力学性能、热学性能和微观结构的分析，确定制备堇青石的最佳烧结工艺烧结工艺路线。实验结果表明：以粉煤灰、硅微粉和工业烧结镁砂为原材料，通过对烧结体进行X-射线衍射（XRD）和扫描电子显微镜（SEM）分析，发现成功合成了堇青石陶瓷材料。通过对烧结体进行X-射线衍射（XRD）和扫描电子显微镜（SEM）分析，结果表明:以高铝粉煤灰、工业烧结镁砂和硅微粉为原料,成功合成了堇青石陶瓷材料。烧结体中主要以β-堇青石和α-堇青石相存在，还有少量的镁铝尖晶石，蓝晶石，铁堇青石，印度石等矿物相生成。.抗压强度，体积收缩率，体积密度，随温度的升高而增大；气孔率，吸水率则随温度的升高而降低；线膨胀系数先随温度升高而降低，当烧结温度达到1200℃时，线膨胀系数略有提升。关键词：堇青石，微观结构，陶瓷材料，热膨胀系数AbstractUsehigh-aluminaflyash（Al2O337.22%、SiO246%）asthemainrawmaterialpreparationofcordierite,addappropriateamountofmagnesite(MgO98.2%),aswellasasmallamountofSiliconPowder(SiO296%)Inaccordancewith注意英语语法问题thetheoreticalformulationofcordierite(MgO13.8%,Al2O334.9%,SiO251.3%)totheratio,.Samplethroughpressuremoldingmachinepressing,moldingpressure120MPa.Andweresinteredat1150℃,1200℃,1250℃,1270℃,1290℃,1310℃sixtemperature.Sinteredsamplessinteredsamplesthroughmechanicalproperties,thermalpropertiesandmicrostructureanalysistodeterminetheoptimumsinteringprocesscordieriteExperimentalresultsshowthat:Flyash,silicafumeandindustrialsinteredmagnesiaasrawmaterial,throughthesinteredbodyX-raydiffraction(XRD)andscanningelectronmicroscopy(SEM)analysis,wefoundsuccessfullysynthesizedcordieriteceramicmaterial.Sinteredbodymainlyintheβ-α-cordieriteandcordieritephaseexists,thereisasmallamountofmagnesiumaluminatespinel,kyanite,ironcordierite,Indiastoneandothermineralphaseformation.strength,thevolumeshrinkageratio,bulkdensity,withtheincreaseofthesinteringtemperature;porosity,waterabsorptionwiththesinteringtemperatureisdecreased;linearexpansioncoefficientofthefirstwithtemperaturedecreaseswhenthesinteringtemperaturereaches1200℃,thelinearexpansioncoefficientofaslightincrease.KeyWords:cordierite,microstructure,ceramicmaterials,thethermalexpansioncoefficient目录Abstract不用体现在目录中TOC\o"1