资源描述
LOGOCeramic Materials School of materials science and engineeringCeramic Materials School of m1 Introduction1.1 what is Ceramics?A product obtained through the action of fire upon earthy materialsInorganic,nonmetallic solids,usually oxides,nitrides,or carbides.Ceramics are typically crystalline in nature and are compounds formed between metallic and non-metallic elements.2Company name1 Introduction1.1 what is Cera1.2 Typical propertiesl Moderate density l Low electrical conductivity insulators l Strong compressive strength tensile strength l Low-moderate thermal conductivity insulators l Brittle l Hard Very high hardnessl raw materials are plentiful and inexpensivel many ceramics transparent to lightl translucent,or opaquel High elastic modulus-greater than metalsl Excellent wear resistance because of high compressive strength and hardnessl Good resistance to chemical attack3Company name1.2 Typical properties ModeMain limitation:very brittle and they are flaw sensitive Cracks and other flaws are always present4Company nameMain limitation:4Company name1.3 Classification advanced ceramics also known as engineering or technical ceramics,refer to materials which exhibit superior mechanical properties,corrosion/oxidation resistance,and thermal,electrical,optical or magnetic properties.5Company name1.3 Classification advanced c6Company name6Company name7Company name7Company name2 Nature of Ceramics8Company name2 Nature of Ceramics8Company n2.1 Porosity and Density9Company name2.1 Porosity and Density9Compa10Company name10Company name11Company name11Company name2.2 Structure of CeramicsCrystal phase,glass phase,pore12Company name2.2 Structure of CeramicsCryst13Company name13Company name3 Ceramic Processing14Company name3 Ceramic Processing14Company Chemical Processes:Sol-gel processingsolid-phase sinteringliquid-phase sinteringmechanical processingPhysical vapor deposition(PVD)Chemical vapor deposition(CVD)15Company nameChemical Processes:Sol-gel pr16Company name16Company namevA common technique for consolidating ceramic powdersvAtomic diffusion mass transfer(particles to open spaces)tremendous amount of shrinkage cracking,distortion&/or residual stressesvReaction formed nonoxide ceramicsSintering of ceramic powders17Company nameA common technique for consoliProperties of Ceramics18Company nameProperties of Ceramics18Compan19Company name19Company nameMechanical properties 20Company nameMechanical properties 20CompanStrong:high compressive strength HardInelastic:do not bend like metalshigh elastic modulusFracture toughness:depends on the geometry of both the object and the crack,the applied stress,and the length of the crackChemical property:durable(resistant to corrosion)Physical properties:low density and high melting point structural applications Weakness:brittle compositesto improve the toughness21Company nameStrong:high compressive strenApplications of Ceramics22Company nameApplications of Ceramics22Comp23Company name23Company nameGlassesnA glass(amorphous material)is quite different from a crystalline metal or ceramic.In a glass,there is no long-range crystalline order.Glass transitionnThe temperature above which the glass becomes soft and viscous enough to work is related to the glass transition temperature,Tg.nBelow the glass transition temperature,the material is relatively hard and stiff;above it,it becomes more viscous.24Company nameGlassesGlass transition24Compa25Company name25Company name26Company name26Company name27Company name27Company name28Company name28Company name29Company name29Company name30Company name30Company name写在最后写在最后成功的基成功的基础在于好的学在于好的学习习惯The foundation of success lies in good habits31写在最后成功的基础在于好的学习习惯31谢谢大家荣幸这一路，与你同行ItS An Honor To Walk With You All The Way讲师：XXXXXX XX年XX月XX日 32谢谢大家讲师：XXXXXX 32
展开阅读全文