Title: Summary Part Ceramic Processing

Choose the correct statement.

- Powder-processing of metals and ceramics involves the following general process steps: powder production, forming and pressing of the powder to produce a green body, sintering the part at high temperatures. (correct)
- Powder-processing of metals and ceramics involves the following general process steps: powder production, forming and pressing of the powder to produce a green body, machining the green body, sintering the part at high temperatures.
- Powder-processing of metals and ceramics involves the following general process steps: powder production, forming and pressing of the powder to produce the final part.

- Powder processes are net-shape or near-net-stape processes that require little or no post-sintering machining. Nevertheless, secondary operations may be performed if high geometric tolerances or improved properties are required. (correct)
- Powder processes always require post-sintering secondary machining to produce the final shape.

- Secondary and finishing operations in powder metallurgy to improve the mechanical and physical properties of the produced part include forging, heat treating, or infiltration with other metals. (correct)
- Secondary and finishing operations in powder metallurgy to improve the mechanical and physical properties of the produced part include forging, alloying and machining.

- For processes based on the sintering of powders, control of the powder shape and quality is an important consideration as it affects the flow, compaction and densification of the particles. (correct)
- For processes based on the sintering of powders, control of the powder shape and quality is an important consideration as it affects the compaction behavior and the temperature required for sintering, and hence the cost of the process.

- The green body, also called green compact or green part, is the compacted powder pressed or cast into the shape of the final product. It is very fragile. Upon sintering, the green body densifies due to coalescence of powder particles, thereby gaining mechanical strength. (correct)
- The green body, also called green compact or green part, is the compacted powder pressed or cast into a generic shape. It is very fragile. Upon sintering, the green body is shaped into the desired shape. Additionally, it densifies due to coalescence of powder particles, thereby gaining mechanical strength.

- Typical mechanisms for sintering of powder particles include solid-state diffusion, vapor-phase transport, and liquid-phase sintering. Which mechanism is dominant depends on the composition of the particles and the processing parameters. (correct)
- Typical mechanisms always active during sintering of powder particles include solid-state diffusion, vapor-phase transport, and liquid-phase sintering.

- During sintering, steps of densification include: neck formation between particles, neck growth until particles coalesce into grains, diffusion along grain boundaries to fill pores at grain boundaries, simultaneous grain growth. (correct)
- During sintering, steps of densification include: neck formation between particles, neck growth until particles coalesce into grains, diffusion along grain boundaries to fill pores at grain boundaries.
- During sintering, steps of densification include: neck formation between particles, neck growth until particles coalesce into grains, diffusion along grain boundaries to fill pores at grain boundaries, grain growth once all pores are filled.

- A ceramic slurry is a mixture of ceramic powder, binder and an immiscible solvent that does not dissolve the ceramic particles (usually water). In slip casting, the slurry is also referred to as slip. (correct)
- A ceramic slurry is a mixture of ceramic powder, binder and an solvent that dissolves the ceramic particles (usually water). In slip casting, the slurry is also referred to as slip.
- A ceramic slurry is a mixture of only ceramic powder and a solvent that does dissolve the ceramic particles (usually water). In slip casting, the slurry is also referred to as slip.

- Important forming processes for ceramic powder slurries include casting, forming, and pressing. (correct)
- Categories of forming processes for ceramic powder slurries include casting, plastic forming, and pressing. The latter includes injection molding, which is often used for high-technology applications.
- Categories of forming processes for ceramic powder slurries include casting, extrusion, rolling, and pressing. The latter includes injection molding, which is often used for high-technology applications.

- Because of their inherent brittleness, ceramics are processed with due consideration of distortion and cracking. (correct)
- Altghoug ceramics are inherently brittle, their low toughness is typically not an issue during sintering, as the sintering particles easily adjust to developing stresses.

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