Sign in IET 130 Week 8 Ceramics [Protected View) PowerPoint File Home Insert Dra

Question

Sign in IET 130 Week 8 Ceramics [Protected View) PowerPoint File Home Insert Draw Design Transitions Animations Slide Show Review view 9 Tell me what you want to do PROTECTED VIEw Becarefuk-files from the Internet can contain viruses. Unless you need to edit, it' safer to stay in protected view. Enable Editing Class Activity/HW- Due: Tues., Mar. 14 1. What makes ceramics different from other engineering materials like metals and plastics 2. What type of crystal structure do ceramics have? 20 3. Spark plugs are mostly made from a ceramic. Why? 4. What is glass? What is glass made from? 5. What is metallic glass? How is metallic glass made? List an application of metallic glass. CMU CENTRAL MICHIGAN Slide 22 of 2.. 22 Note a Search the web and Windows 440 PM

Explanation / Answer

Ceramics are brittle materials exhibiting high melting point. Oxides or carbides of metals are known as ceramics.They are more heat and corrosion resistant than metals.
Ceramic materials are held together by a chemical bond( ionic or sometimes covalent bond). For metals, the chemical bond is called the metallic bond. The bonding of atoms together is much stronger in covalent and ionic bonding in comparison to metallic bonds. Thus explaining why ceramics have high melting point and are brittle than metals or plastic.

The differences are listed below

1. Metals are ductile whereas ceramics are not.
2. Metals and plastics have lower electrical resistivity than ceramics.
3. Metals are made of metallic elements, or compounds, alloys or mixtures of metallic elements with other materials; whereas ceramics are mixtures of glass, essentially and other materials.
4. Metals exhibit greater tensile force than ceramics.
5. Most metals are crystalline at the microscopic level whereas ceramics are not.
6. Metals are more chemically reactive compounds than ceramics.

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