Processing, properties and applications of advanced ceramic materials
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1 Processing, properties and applications of advanced Dr. Vaclav Pouchly Advanced Ceramic Materials, Central European Institute of Technology
2 Outline: 1. Definition of ceramics 2. Ceramic processing 2.1. Powder synthesis and processing 2.2. Shaping 2.3. Sintering 3. New trends in sintering (pressure-assisted sintering, electric field assisted sintering) 4. Example bio- 5. Conclusions
3 Outline: 1. Definition of ceramics 2. Ceramic processing 2.1. Powder synthesis and processing 2.2. Shaping 2.3. Sintering 3. New trends in sintering (pressure-assisted sintering, electric field assisted sintering) 4. Example bio- 5. Conclusions
4 Traditional ceramics Advanced ceramics Raw materials without or with partial treatment Different crystals with glassy phase Synthetic powder Controlled microstructure Better mechanical properties
5 Metallic Materials classification Non-metallic Organic Inorganic (nonmetallic) C, H (O, N, P, S, )
6 Bonds in Ionic Covalent Mixed (ionic-covalent) different electronegativity of atoms near electronegativity of atoms portion of ionic bonding increases with increasing difference between electronegativities Bonding in ceramics is responsible for the specific properties of ceramics and diferences between ceramics and metals
7 Covalent bond Ionic bond Material CaF 2 MgO NaCl Al 2 O 3 SiO 2 Si 3 N 4 ZnS SiC Proportion of ionic bonding 89% 73% 67% 63% 51% 30% 18% 12%
8
9 The term ceramics is often limited to inorganic materials of non-metallic nature predominately in crystalline state and prepared from powder material using sintering at high temperatures. We will distinguish: ceramics (according to the limited definition) and glass, (non-metallic single crystals and carbon products)
10 Technology of non-metallic materials classification into materials groups Polycrystalline ceramics Ceramic single crystals Glass Plastics Composites
11 Monocrystal Polycrystal Amorphous
12 Polycrystalline ceramics Advantages: high melting point strength in pressure hardness wear resistance chemical resistance intermediate and lower density Restrictions: brittle behaviour sensitivity to thermal shock difficult preparation and expensive machining
13 Polycrystalline ceramics Advantages: high melting point strength in pressure hardness wear resistance chemical resistance intermediate and lower density Restrictions: brittle behaviour sensitivity to thermal shock difficult preparation and expensive machining
14 What is dislocation
15 Movement of dislocation
16 Cause of brittlness: restricted motion of dislocations Low mobility Low manoeuvrability High Peierls-Nabarro stress in covalent and complex ionic crystals Example: MgO can be partially ductial as a single crystal low P-N stress von Mises criterion is not fulfilled for plastic deformatio of polycrystals (5 independent slip systems) Polycrystalline MgO can be ductile above 1700 C other slip system are initiated
17 Outline: 1. Definition of ceramics 2. Ceramic processing 2.1. Powder synthesis and processing 2.2. Shaping 2.3. Sintering 3. New trends in sintering (pressure-assisted sintering, electric field assisted sintering) 4. Example bio- 5. Conclusions
18
19 Synthesis methods Mechanochemical synthesis Solid-state reaction Sol-gel synthesis Spray-pyrolysis Hydrothermal (HT) synthesis Sonospray synthesis Ultrasound (US) precipitation synthesis Microwave (MW) precipitation synthesis Ultrasound and microwave precipitation synthesis
20
21 agglomerate vs. aggregate
22
23
24 Outline: 1. Definition of ceramics 2. Ceramic processing 2.1. Powder synthesis and processing 2.2. Shaping 2.3. Sintering 3. New trends in sintering (pressure-assisted sintering, electric field assisted sintering) 4. Example bio- 5. Conclusions
25 Requirements on shaping 1. Homogeneous structure of ceramic green body 2. Minimum defect size in ceramic green body (bubbles, craks, deformation) 3. Minimum requirements on machining of final sintered body 4. Automatization capability, harmless and enviromentally safe
26 Shaping methods Dry shaping Wet shaping uniaxial pressing isostatic pressing slip casting (incl. centrifugation, EPD) methods of direct consolidation tape casting Plastic shaping injection moulding extrusion calandering 3D printing Solid free-form fabricatition direct jet printing stereolithography robocasting fused deposition
27 Shaping methods Dry shaping Wet shaping uniaxial pressing isostatic pressing slip casting (incl. centrifugation, EPD) methods of direct consolidation tape casting Plastic shaping injection moulding extrusion calandering 3D printing Solid free-form fabricatition direct jet printing stereolithography robocasting fused deposition
28 Uniaxial pressing
29 One-sided pressing Two-sided pressing
30 Two-sided pressing with segmented punch
31 Spray dryer
32
33 Shaping methods Dry shaping Wet shaping uniaxial pressing isostatic pressing slip casting (incl. centrifugation, EPD) methods of direct consolidation tape casting Plastic shaping injection moulding extrusion calandering 3D printing Solid free-form fabricatition direct jet printing stereolithography robocasting fused deposition
34 Electrostatic forces Steric forces Depletion forces
35 Slip casting
36 Direct consolidation Principle: Liquid ceramic suspension is transformed to the solid body without removal of a liquid medium Consolidation Physical bonds between ceramic particles DCC Chemical reaction of additives forms a gel Gelcasting
37 Shaping methods Dry shaping Wet shaping uniaxial pressing isostatic pressing slip casting (incl. centrifugation, EPD) methods of direct consolidation tape casting Plastic shaping injection moulding extrusion calandering 3D printing Solid free-form fabricatition direct jet printing stereolithography robocasting fused deposition
38 Injection moulding Schematic diagram: Use: Mass production of complex parts Limitations: Defects in thick-wall and fineparticle bodies Injection moulding defects Binder removal defects
39 Injection moulding
40 Extrusion
41 Extrusion
42 Shaping methods Dry shaping Wet shaping uniaxial pressing isostatic pressing slip casting (incl. centrifugation, EPD) methods of direct consolidation tape casting Plastic shaping injection moulding extrusion calandering 3D printing Solid free-form fabricatition direct jet printing stereolithography robocasting fused deposition
43 Principle: Computer controlled selective binding of layers of free powder by binder jet printing colloidal SiO 2 polymer solution Layer thickness ~0,1 mm Accuracy of the method: 0.05 mm
44
45 Outline: 1. Definition of ceramics 2. Ceramic processing 2.1. Powder synthesis and processing 2.2. Shaping 2.3. Sintering 3. New trends in sintering (pressure-assisted sintering, electric field assisted sintering) 4. Example bio- 5. Conclusions
46 Sintering = compaction of particle body at high temperature Driving force of sintering is the decrease of total interface energy by means of replacement of ceramics/ atmosphere interface with higher energy by ceramics/ceramics interface (grain boundary) with lower energy Sintering is realized using a mechanism of vacancy diffusion
47
48 Dilatometry
49 Dilatometry Relative elongation [ ] Temperature
50 Dilatometry Relative elongation [ ] Temperature
51 Dilatometry Relative elongation [ ] Temperature
52 Dilatometry Relative elongation [ ] Temperature
53 Outline: 1. Definition of ceramics 2. Ceramic processing 2.1. Powder synthesis and processing 2.2. Shaping 2.3. Sintering 3. New trends in sintering (pressure-assisted sintering, electric field assisted sintering) 4. Example bio- 5. Conclusions
54
55 Hot Isostatic Press
56 Hot Isostatic Press - Advantages External pressure Isostatic distribution of pressure Any shape Disadvantages None?
57 Hot Isostatic Press - Advantages External pressure Isostatic distribution of pressure Any shape Disadvantages Too expensive Capsulation needed
58 Our results
59 Electric Field During Sintering
60 Spark Plasma Sintering - Advantages external pressure rapid heating rate direct heating pulse heating Disadvantages only easy shapes
61 Outline: 1. Definition of ceramics 2. Ceramic processing 2.1. Powder synthesis and processing 2.2. Shaping 2.3. Sintering 3. New trends in sintering (pressure-assisted sintering, electric field assisted sintering) 4. Example bio- 5. Conclusions
62 Material Advantages Disadvantage Polymers Resiliant Weak Tough Low E Easy to fabricate Not usually bioactive Low density Not resorbable Metals Strong Can corrode in human body Wear resistence High E Tough High density Easy to fabricate Not usually bioactive Not resorbable Ceramics Biocompatible Low tensile strength Wear resistant Difficult to fabricate Can be lightweight Low toughness Not resiliant
63 Alumina nad zirconia nearly inert No chemical change during long-time use By 2006 >10 6 alumina balls for femoral head
64 Material Advantages Disadvantage Polymers Resiliant Weak Tough Low E Easy to fabricate Not usually bioactive Low density Not resorbable Metals Strong Can corrode in human body Wear resistence High E Tough High density Easy to fabricate Not usually bioactive Not resorbable Ceramics Biocompatible Low tensile strength Wear resistant Difficult to fabricate Can be lightweight Low toughness Not resiliant
65 Fracture toughness of t-zro 2 nanoceramics
66 Fracture toughness of t-zro 2 nanoceramics density 99. 6%t.d grain size 85nm structural ceramics, bioceramics
67 Hydroxyapatite Generally A 10 (BO 4 ) 6 X 2, A=Ca, B=P,X=OH Dense Particles Porous Augmentation of alveolar ridge Filler in bony defects Filler in bony defects Orthopedic surgery
68 Bioceramic coatings Protect the substrate against corrosion Make the implant biocompatible Turn a non-bioactive surface into bioactive one Usual combinations Polycrystalline ceramics on ceramics Glass on ceramics Polycrystalline ceramic on metal
69 Thank you for your attention NF-CZ07-ICP : Formation of research surrounding for young researchers in the field of advanced materials for catalysis and bioapplications
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