(a)
Interpretation:
The given material cobalt/tungsten carbide has to be classified as ceramic-ceramic or ceramic-metal and or ceramic polymer.
Concept introduction:
Ceramic composites:
Materials which are inorganic, non-molecular solids, crystalline (quartz) and amorphous (glass) are known as ceramics. Ceramics are brittle in nature and susceptible to break. They are hardened by combining ceramic powder before sintering with fibers such as boron and silicon carbide. The obtained hybrid materials are known as ceramic composites.
Ceramic-metal composites:
Similar to ceramic composites but in this composite fiber and matrix are made of ceramic and metal. Example: Aluminum-strengthened boron fiber.
Ceramic-polymer composites:
Similar to ceramic composites but in this composite fiber and matrix are made of ceramic and
(b)
Interpretation:
The given material silicon carbide/zirconia has to be classified as ceramic-ceramic or ceramic-metal and or ceramic polymer.
Concept introduction:
Ceramic composites:
Materials which are inorganic, non-molecular solids, crystalline (quartz) and amorphous (glass) are known as ceramics. Ceramics are brittle in nature and susceptible to break. They are hardened by combining ceramic powder before sintering with fibers such as boron and silicon carbide. The obtained hybrid materials are known as ceramic composites.
Ceramic-metal composites:
Similar to ceramic composites but in this composite fiber and matrix are made of ceramic and metal. Example: Aluminum-strengthened boron fiber.
Ceramic-polymer composites:
Similar to ceramic composites but in this composite fiber and matrix are made of ceramic and polymers. Example: carbon-epoxy.
(c)
Interpretation:
The given material boron nitride/epoxy has to be classified as ceramic-ceramic or ceramic-metal and or ceramic polymer.
Concept introduction:
Ceramic composites:
Materials which are inorganic, non-molecular solids, crystalline (quartz) and amorphous (glass) are known as ceramics. Ceramics are brittle in nature and susceptible to break. They are hardened by combining ceramic powder before sintering with fibers such as boron and silicon carbide. The obtained hybrid materials are known as ceramic composites.
Ceramic-metal composites:
Similar to ceramic composites but in this composite fiber and matrix are made of ceramic and metal. Example: Aluminum-strengthened boron fiber.
Ceramic-polymer composites:
Similar to ceramic composites but in this composite fiber and matrix are made of ceramic and polymers. Example: carbon-epoxy.
(d)
Interpretation:
The given material boron carbide/titanium has to be classified as ceramic-ceramic or ceramic-metal and or ceramic polymer.
Concept introduction:
Ceramic composites:
Materials which are inorganic, non-molecular solids, crystalline (quartz) and amorphous (glass) are known as ceramics. Ceramics are brittle in nature and susceptible to break. They are hardened by combining ceramic powder before sintering with fibers such as boron and silicon carbide. The obtained hybrid materials are known as ceramic composites.
Ceramic-metal composites:
Similar to ceramic composites but in this composite fiber and matrix are made of ceramic and metal. Example: Aluminum-strengthened boron fiber.
Ceramic-polymer composites:
Similar to ceramic composites but in this composite fiber and matrix are made of ceramic and polymers. Example: carbon-epoxy.
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General Chemistry: Atoms First
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- (a) Pure iron has a change in crystal structure from BCC to FCC when heating up above 912°C. If the atomic radius of an Fe atom is 0.124 nm, calculate the volumes of the FCC and BCC unit cells. (b)Recall that there are two atoms per BCC unit cell, and four atoms per FCC unit cell. With this information in mind, calculate the percent change in volume of a sample of pure Fe as it transforms from an FCC to a BCC structure upon cooling below 912°C. Specify if this percent change manifests as an increase or decrease in volume of the sample.arrow_forwardWhich of these statements is false?(a) As you go down column 4A in the periodic table, the elementalsolids become more electrically conducting. (b) Asyou go down column 4A in the periodic table, the band gapsof the elemental solids decrease. (c) The valence electroncount for a compound semiconductor averages out to fourper atom. (d) Band gap energies of semiconductors rangefrom ∼0.1 to 3.5 eV. (e) In general, the more polar the bondsare in compound semiconductors, the smaller the band gap.arrow_forwardDefine a semiconductor? Describe the two main types of semiconductorswhen it is doped with(a) group 13 element, (b) group 15 element.arrow_forward
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