What is a ceramic capacitor?
Capacitors are classified based on the fixed capacitance and variable capacitance. A ceramic capacitor is an example of fixed capacitance. Ceramic capacitors are made by coating porcelain or ceramic on two sides of the disk with a silver which is stacked together to make a capacitor. It is an electrical device which is used for storing energy in the form of an electric field.
Therefore, a ceramic capacitor is defined as a capacitor which uses ceramic material as a dielectric material. Multi-layer ceramic capacitors and ceramic disc capacitors are the two most widely used ceramic capacitor. Ceramic capacitor are also known as Disc capacitors.
Classification of the ceramic capacitor based on temperature
A ceramic capacitor is classified into three types based on working temperature, tolerance, and temperature drift:
1. Class 1 ceramic capacitor: These capacitors are the most stable capacitor with respect to temperature. Magnesium titanate and Calcium titanate are the dielectric compounds that are used in the ceramic capacitor with positive temperature coefficient and negative temperature coefficient, respectively.
2. Class 2 ceramic capacitor: These capacitors find applications where volumetric efficiency is required. They are also used for coupling, decoupling, and bypass applications and all these processes don’t require accuracy. -50℃ to +85℃ is the temperature range while 2.5% is the dissipation factor.
3. Class 3 ceramic capacitor: These capacitors are also used for high volumetric efficiency where the accuracy is poor and the dissipation factor is also low. +10℃ to +55℃ is the temperature range while 3 to 5% is the dissipation factor. Barium titanate is the dielectric that is used in Class 3 ceramic capacitor.
Characteristics of the ceramic capacitor:
Following are the characteristics of a ceramic capacitor:
1. Tolerances and precision
2. An advantage in terms of size
3. High voltage and high power
A fabrication process of ceramic capacitors:
Following are the fabrication process of ceramic capacitors after layers of dielectric and electrode:
1. Printing of internal electrodes onto the dielectric sheets.
2. Arrangement of dielectric sheets.
3. Pressing of the dielectric sheets.
4. Cutting of the dielectric sheets.
6. Coating of external electrodes.
8. Measurements and packing
Applications of ceramic capacitor:
Following are the applications of the ceramic capacitor:
1. Ceramic capacitors find applications in the resonant circuit in transmitter stations.
2. Printed circuit boards and high-density applications use surface mount capacitors.
3. Capacitors from Class 2 find application in power circuit breakers, induction furnaces etc where a high voltage is used.
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