Ceramics Processing Flashcards
What are traditional ceramics?
Traditional ceramics are materials made from natural raw materials like clay, silica and feldspar commonly used for products such as pottery, tiles and bricks
What are the main steps involved in processing traditional ceramics?
1- Raw material preparation ( crushing/grinding)
2- Forming ( shaping)
3- Drying ( removal of water )
4- Firing (heating to achieve strength!through sintering)
5- Glazing ( for aesthetics and functionality)
Why is firing crucial in traditional ceramic processing?
Firing increases the mechanical strength by causing sintering, where particles bond together reducing porosity and improving density
What are new ceramics?
New ceramics are made from pure or synthesized materials, often used for high-performance applications such as electronics, aerospace and biomedical devices.
What distinguishes the processing of new ceramics from traditional ceramics?
New ceramics require more precise control of composition and microstructure.
What material is commonly used in new ceramics?
Alumina (Al2O3) ; Silicon Carbide (SiC); zirconia ( ZrO2)
What are cermets ?
Composite materials made of ceramics particles and metals matrix
What are the common applications of cermets?
They used in applications like cutting tools ; aerospace components and wear resistance coatings
How are cermets processed?
1- Powder preparation ( both ceramic and metal powders )
2- Mixing and blending
3- Compaction ( using pressing techniques)
4- sintering ( to bond the materials )
5- Finishing ( grinding or coating)
What challenges are encountered in processing cermets?
Maintaining uniform distribution of ceramic particles and achieving strong bonding between the metal and ceramics phases
Why is product design important for ceramics and cermets?
Proper design ensure that the material’s properties are fully utilized while minimizing risks like cracking brittleness or premature wear
What are some key design considerations for ceramic product ?
1- Avoid sharp corners( reduce stress concentration)
2- Thermal expansion management ( prevent cracks due to temperature changes)
3- Surface treatment ( improve wear resistance)
4- Porosity control ( ensure proper mechanical properties)
How does product design in cermets differ from ceramics ?
In cermets designers must account for different thermal and mechanical behaviors of the metal and ceramic phases to prevent delamination or failure under stress