成型坯体 green body; green compact
5.1 Introduction
1. The goal of compaction Forming processes take a mix, slip, or plastic material and form it into a consolidated body with a certain geometry.
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1 iPhone X demands more than 1000 MLCC.
Tape casting (Dorctor blade method)
Tape casting equipment
Example 3：Ceramic radom
Slip casting
The primary goal：(primary property of green compact) Higher density ？ homogeneity?
1. The goal of compaction
The primary goal is to obtain a compact as homogeneous as possible.
Chapter 5. Forming of Ceramics
Content 5.1 Introdution 5.2 Addictives in ceramic forming 5.3 Forming processes of ceramic Dry presssing Casting methods Plastic-forming methods 5.4 Solid freeform fabrication
Contrary to what has been thought for a long time (and is still often heard) maximum density is not the primary goal.
2. Clasification of Forming methods Example 1： electric porcelain insulator
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Dry pressing
Suspension processing
Paste processing
Hand throwing
（1） Pressing Pressing is accomplished by placing the powder into a die and applying pressure to achieve compaction.
Focus 1. Understand the goal of forming 2. Familiar with forming processes of ceramic 3. Understanding the principle and key technology of ceramic molding 4. Understanding the principle and basic method of 3D printing for ceramic materials
Extrusion
Injection moulding
Screen printing
（3）Casting (suspension processing)
Casting includes slip casting , tape casting ,gel casting and ….. The feed material for these processes is a suspension, i.e. a colloidal solution, containing a solvent, a deagglomerated stabilised powder , some additives.
Example 4：Ceramic cores
hot press casting 热压铸成型
Products of hot press casting
Example 5：
Spark plug
Silicon nitride turbine rotor and blades
Small ceramic parts
Homogeneity in packing of the particles (coordination number), pore size distribution and density.
Higher densities are helpful in sintering process but the benefits of higher densities are only fully realised in homogeneous compacts. Another goal of Shape-forming is to form a certain shape with sufficient strength and also sufficient contact points between the powder particles, necessary for the sintering process.
表示陶瓷成型的词汇 Forming of Ceramics Shaping processes Molding compaction Forming processes
常用陶瓷成型方法
pressing；dry pressing；isostatic pressing
slip casting; tape casting; gel casting; hot press casting extrusion; injection molding
3. Selection of forming method
Selection of a forming process depends on size, Shape, microstructural characteristic, dimensional tolerances, the levels of reproducibility, cost.
先进陶瓷制备与加工 （先进陶瓷工艺学）
Advanced Ceramics Processing
Chapter 5. Forming of Ceramics
Powder preparation Forming into a greenshape Drying & debinder Sintering Post treatment After powder process compaction is the second step in the ceramic fabrication process.
•Injection moulding
注射成型
Schematic of injection molding
Products by injection molding
Example 6: ceramic honeycomb support
Extrusion
classification of forming methods
Isostatic pressing + Green machining
•Isostatic pressing
Cutting tools
Ceramic component for automobile engine
Small parts formed by dry pressing
Example 2：multi-layer ceramic capacitor
Forming methods for mobile phone shell
Forming method Feed materials Shape of green body binder conte nt high
Injection Granulated small, molding mixture of intricate powder shapes and binder Tape Slurry Thin, sheet high casting Die Powder or Small, Simple low pressing granules shapes Isostatic Powder or Larger, low pressing granules intricate shapes
（2）plastic forming (paste processing )
plastic forming is based on the changes in the viscosity during the formation process. The compacts are shaped from a mixture that is deformable under an applied pressure, containing a ceramic powder and various additives. (with plastic behaviour)