PH8201 Important Question Physics For Civil Engineering Regulation 2017 Anna University
The PH8201 Important Question Physics For Civil Engineering Regulation 2017 Anna University
PH8201 Important Question with answer:
The important question with answer are provided
What are metallic glasses?
Metallic glasses are amorphous metals (Glass metals). It is a non-crystalline alloy with molten liquid state it has the short range of atomic order. Metallic glasses share the properties of both glasses and metals, these are strong, ductile, malleable, opaque and brittle.
Define Glass transition temperature
It is the temperature at which liquid like structure is frozen into the solid. The glass transition temperature for metallic alloys in about 20OC to 30OC
How the metallic glasses are prepared? Mention the different methods.
Metallic glasses are usually prepared by rapid quenching, ie., cooling a metallic liquid so rapidly such that there is no enough time for ordered crystalline structure to develop. By this way we retained the liquid like structure into the solid. The cooling rate is in the order of 2 x 10 Kelvin per second
Methods of preparation
Twin roller system
Melt spinning system
The Melt Extraction system
Melt spinning system is the most commonly used method.
What are the types of metallic glasses?
Metallic glasses are classified into two types
Metal – Metal metallic glasses
These are combination of metals and metals Example: Ni-Nb, Mg-Zn, Cu-Zr, and Hf-V
Metal – Metalloid metallic glasses
These are combinations of metals and metalloids Example: Fe, Co, Ni and B, Si, C, P
PH8201 Important Question
What are the advantages of the metallic glasses used as core material?
Transformer core is used to get maximum magnetic flux (energy). Transformer core should have low hysteresis loss and low eddy current loss.
Metallic glasses are available in thin sheets therefore the size and weight of the transformer is reduced.
Hysteresis loss is directly proportional to the area of the hysteresis loop. The loop area of the metallic glasses is very small and also has high initial permeability. So the hysteresis loss is almost zero.
The eddy current in the core inversely proportional to the resistivity of the core material and directly proportional to the thickness of the lamination of the core. Since the resistivity of the metallic glasses is high and the thickness of the core laminated core is less. Therefore the eddy current loss is very less.
Thus metallic glasses used as core material due to small thickness, smaller area, less weight high resistivity soft magnetic with low hysteresis and eddy current losses.
What are the applications of metallic glasses?
Metallic glasses are used in
Reinforcing elements in concrete, plastic, rubber
Reinforcing filament in pressure vessels
Construction of flywheels for energy storage
Razor blades and different kinds of springs
Tape recorder heads, etc,
The PH8201 Important Question Physics For Civil Engineering Regulation 2017 Anna University
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