高炉炼铁 英文版.ppt

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1、SiAlONCERAMICSFROMLOWCOST-Si3N4POWDER用廉价-Si3N4粉制备SiAlON陶瓷F.KARADept.MaterialScienceandEngineering,AnadoluUniversity,Eskisehir,TURKEYINTRODUCTION前言Si3N4andSiAlONceramicsaregenerallyproducedfromα-Si3N4powderstoachieveelongated（拉长,(使)伸长,延长）grainmorphgology（形态学、

2、形态论）whichprovideshighfracturetoughness（断裂韧性）Useofβ-Si3N4powdersmainlycausesequiaxed（由等轴晶粒组成的）grainmorphologywhichresultsinlowerfracturetoughness.*SIALON-Al2O3材料INTRODUCTION---前言Fineα-Si3N4powdersareexpensiveandthispreventswidescaleapplicationsofSiAlONceramicsβ

3、-Si3N4powderscanbecost-effectivedependingontheirproductionroutesandquality.UseofsuchpowdersmayopenuppossibilitiesofwiderapplicationsofSiAlONsAIMCanweusearathercoarseβ-Si3N4powderinordertoproducecost-effectiveα/β-SiAlONsforcommonapplications(wearplates,refracto

4、riesandothers)?PROCESSFLOWCHART工艺流程Si3N4+AlN＋Al2O3powders+additives（Si3N4+AlN粉和添加剂）DISTILLEDWATER蒸馏水ATTRITIONMILLING混磨DRYING干燥PRESSING成型GPSat1940C10-22barN2（GPS气氛加压烧结）GPS=gas-pressuresinteringHeattreatmentat1990C22barN2Characterisation特性ElementAğ.%Ca0.02Fe0.

5、04Al0.1O1Si0.5%-Si3N480Wt%Si55N35Fe1O3max-Powder(As-received)-Powder(As-received)AvailableSpecs.-Powder(As-received)Primaryparticlessize:4.7µmMilleddowntoD50=1.2µm-Powder(As-received)Primaryparticlesize:1.7µmUsedinas-receivedstate-Powder(As-recei

6、ved)-Powder(As-received)β-powder(YSmCa)α-powder(YSmCa)ObtainedphasecompositionApprox.50SiAlONDesignedphasecomposition:50:50SiAlONAdditionofα–powdertoβ-powder(Y-Sm-Ca)50%α-powder+50%β-powder50%β-powder+50%α-powderYSmCaβ-powder(YSmCa)CommercialHClβ-powderα-p

7、owderH2SO4β-powderα-powderCommercialCorrosionTestResults---抗侵蚀实验结果%WeightLossMediaCommercialSi3N4α/β-SiAlONfromα-powderα/β-SiAlONfromβ-powderHNO365%0.200.060.25HCl20%2.840.841.86H2SO495%0.060.0390.03NaOH50%0.210.770.42Citricacid50%0.510.431.69300hinsolutionCit

8、ricacid柠檬酸CONCLUSIONS---结论Rathercoarseβ-Si3N4powdercanbeusedtoobtaindenseα/β-SiAlONs.Comparedtoα-Si3N4derivedSiAlONs,microstructureiscoarseanddevelopmentoflargeneedle-likegrainsisr