High-Voltage Applications for Macor Glass Ceramics
The use of glass ceramics like Macor leads to more compact capacitor designs and new industrial and medical applications. Read on to find out more.
A capacitor is an electric component that stores energy as an electrostatic field. The storage material is known as a dielectric and is fixed between metal contacts, which are often gold in the case of micro components. Macor, a glass ceramic, is used to make capacitor designs more compact. Read on for more information.
A capacitor is used to stabilize, buffer or couple the current flow and voltage in electric power conversion systems. These are systems that may convert the power from alternating current (AC) to direct current (DC) or vice versa, or just change the frequency or voltage of the power flow, or some combination of these.
There is an increasing demand for high-voltage capacitors in applications such as excimer lasers in both medical and industrial applications and in X-ray equipment used in the medical sector, as well as high-voltage power supplies to various industrial sectors, including power grids used for renewable energy distribution.
The problem is that the higher the voltage and amperage in a system, the higher the thermal load. Many ceramics based on polypropylene that are used for high-voltage applications are limited to those where temperatures do not exceed 90 degrees Celsius. They lose their capacitance at higher temperatures.
Macor is a unique machinable glass ceramic with a very high heat resistance. It is able to withstand temperatures of up to 1,000 degrees Celsius without deformation and can be used at constant temperatures of up to 800 degrees C.
These properties make Macor a superior material to use as a high-voltage insulator, as its dielectric strength is high, as is its electrical resistivity. A further advantage is that Macor has zero porosity and so will not shrink.
The combination of a pore-free and highly homogeneous structure that creates a high dielectric strength means that the material can be used in a capacitor whose storage density may be ten times that of current storage capacitors.
A knock-on effect of this is that capacitors of a very large storage capacity can be built with a smaller size and a lighter weight.
This means that the material will have further potential applications in transducers used for high-voltage networks and as capacitors used in filtering, testing and resonant circuits. It is also well suited for applications involving extremely high frequencies.
If you would like more information about Macor and its uses or have any queries, contact us or visit our website. www.multi-lab.co.uk or contact Mr Jules.Blain@multi-lab.co.uk