DM308 Exam Materials Part 4

Questions and Answers

How is the ice in freeze casting treated to produce porous ceramic pre-forms?

Mixed with plastic forming clay

Allowed to sublimate at low pressure (correct)

Heated to high temperature

Melted and poured into molds

What is the purpose of physical vapour deposition (PVD) in relation to ceramics?

To create thick coatings

To achieve low porosity and a refined surface finish (correct)

To make ceramics resistant to high temperatures

To increase porosity

How are ceramic coatings applied using plasma spraying?

By mixing with plastic forming clay

By feeding ceramic powder through plasma created by passing an electric arc (correct)

By heating and melting the ceramics

By evaporating the ceramics in a vacuum

What method allows for the production of highly porous ceramics suitable for filters and catalysts?

Freeze casting Signup and view all the answers

What happens to ceramic powder during physical vapour deposition (PVD)?

It is evaporated and transported onto the substrate Signup and view all the answers

What method is effective for reducing porosity in products made using additive manufacturing techniques?

HIP-ing Signup and view all the answers

Which technique involves pouring a ceramic mixture into a plaster mould and leaving behind a viscous layer?

Slip casting Signup and view all the answers

What allows the mass production of ceramics with complex relief patterns?

Slip casting Signup and view all the answers

Which process involves the use of a monomer binder that polymerizes to form a gel binding ceramic particles?

Gel-casting Signup and view all the answers

Which technique utilizes a suspension of ceramic particles in water for processing?

Freeze casting Signup and view all the answers

Which process ensures the cohesion of ceramic powder in green parts?

Binder Signup and view all the answers

What is the main function of a dispersant when mixed with ceramic powder?

Decrease viscosity Signup and view all the answers

Which stage involves removing the binding agent from technical ceramics?

Sinter firing Signup and view all the answers

What is the purpose of green machining in technical ceramic production?

To shape raw components Signup and view all the answers

Which process involves adjusting the viscosity of the ceramic mixture?

Plasticising Signup and view all the answers

What is the main reason for using Titanium nitride (TiN) in various applications?

Biocompatibility Signup and view all the answers

Which material can be formed when clay is fired?

Silica and Alumina Signup and view all the answers

What mineral is commonly found in clay besides Kaolinite?

Iron Oxide Signup and view all the answers

What microstructure is largely responsible for the properties of porcelain?

Mullite Signup and view all the answers

What kind of coatings can Titanium nitride (TiN) be used for in the industry?

Wear-resistant tool coatings Signup and view all the answers

What microstructure does mullite form when the processing and composition are right?

Interlocking needles Signup and view all the answers

Apart from clay, what other materials can be used to produce mullite-containing ceramics?

Pure silica and alumina Signup and view all the answers

In what specific applications are ALON ceramics predominantly used?

Military applications such as transparent armor Signup and view all the answers

What unique property of SiAlONs makes them phosphorescent in UV light when doped?

High chemical stability Signup and view all the answers

What outstanding properties do ceramics, as mentioned in the text, possess?

High hardness and good high-temperature properties Signup and view all the answers

Study Notes

HIP-ing is a method used to reduce porosity in products made through additive manufacturing techniques.
Slip casting involves pouring a ceramic mixture (slip) into a plaster mold, allowing it to dry, and then removing the ceramic for further processing.
Tape casting is used to produce thin ceramic tapes or sheets by flowing a ceramic slurry onto a carrier film and adjusting thickness with a doctor blade.
Gel-casting involves mixing ceramic powder with water and a binder to create a gel that can be used to fill complex molds for precise ceramic forming.
Freeze casting uses a suspension of ceramic particles in water to create porous ceramic pre-forms for filters, catalysts, and medical applications.
ALON ceramics are known for high hardness, high melting point, and transparency, widely used in military applications for armor and sensor windows.
SiAlON ceramics are valued for their hardness, use temperature, chemical stability, and are used in various applications like cutting tools and colored phosphors.
The processing of technical ceramics involves steps like material preparation, molding, sintering, and finishing, with a focus on quality control throughout the production stages.

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Description

Test your knowledge on the processing stages involved in technical ceramics production, from powder material preparation to quality control. Learn about steps like pulverising, moulding, sintering, finishing, and more.