#sic coating

Discovered nearly simultaneously by two different ways, by two different scientists, from two different countries, silicon carbide was the accidental artificial crystalline compound of Silicon and Carbon which, as we know today, is one of the most powerful semiconductors. It’s found naturally at extremely low concentration (in the form of Moissanite), artificially, it is synthesized in the laboratory/factory by passing current through a mixture of pure silica sand and carbon in the form of finely ground coke.

Silicon carbide, also popularly known as SiC is essentially one of the hardest synthetic material known and its economic value lies in the fact that if Silicon carbide coating is carried out over the materials that are vulnerable to corrosion, then the maintenance costs of such materials lower down significantly. Silicon carbide coating in India is quite affordable and unquestionably highly effective. High purity silicon carbide coating is beneficial for the industries that deploy metals in high temperature and humidity conditions.

One of the very economically important and highly used silicon carbide coated element is graphite, which is attractive due to its light weight, high strength and modulus, excellent thermal shock resistance, and accessibility. SiC coated graphite is highly oxidation resistant, as opposed to its bare counterpart which starts to oxidize at 500°C.

It’s sturdily is known for a fact, because of which, other than the above uses it is being used for making tools like sandpapers, grinding wheels, cutting tools, hard ceramics, automobile parts, refractory linings, high-temperature bricks, heating elements, jewelry, wear-resistant parts for pumps and rocket engines, SiC coating is used in solar cells, toys, motorcars, and electronic devices as well. Silicon Carbide coated Graphite is highly purifying in nature and is used in the most advanced water purifying techniques.

Additionally, both graphite and silicon carbide have a high thermal conductivity, making them apt to be used in susceptors of various types of semiconductors. Silicon carbide coated susceptors are highly effective and corrosion-resistant, consequently of high economic value.

Thick, high-quality epitaxial layers of SiC coating have been grown for use in devices and are continually being improved.

If susceptors or semiconductors required are to be of well-defined crystal size, isotropic structure and of low surface roughness, then a specially designed process of Silicon Carbide coating for MOCVD is to be followed which includes CVD technology.

According to the dictionary definition, the susceptor is essentially a material that can be used on account of its ability to absorb electromagnetic energy from the surrounding environment and convert it to heat radiations. Susceptor essentially is an absorbing metal that highly capable of changing the form of energy.  It might as well be designed in order to make the heat rays be re-emitted as infrared thermal radiation. The electromagnetic energy belongs most of the times to radiofrequency or microwave radiation. It is most similar to the technology of microwaves, which we use almost daily.

SiC coated susceptors are used in industrial heating processes, and sometimes in culinary microwave ovens as well. The name of susceptors is derived from susceptance, an electrical property of materials that measure their tendency to convert electromagnetic energy to heat.

Silicon Carbide Coated Susceptors are a typical example of SiC coating for MOCVD. If susceptors or semiconductors required are to be of well-defined crystal size, isotropic structure and of low surface roughness, then a specially designed process of Silicon Carbide coating for MOCVD is to be followed which includes CVD technology. Silicon Carbide Coated Susceptors are highly relevant to the methods and apparatus of semiconductor processing, more individually speaking, they are used in performing atomic layer epitaxy.

In the design of rapid thermal processing chambers (which are common in most huge processing units), one of the major challenges to overcome is the temperature non-uniformity. In this context, temperature non-uniformity can be defined as the difference between a maximum temperature measured at any coordinate of the substrate and the minimum temperature present simultaneously on any other coordinate of the same substrate.

The substrate may be heated using conductive heating appliances or radiation in laboratories or industries, traditionally various methods are used to control temperature uniformity of a substrate during the processing, like the use of reflective and absorptive shields, liners, especially convoluted coil layout (inside the heater), and power supply control. Despite these measures, temperature uniformity still remains a major issue for the manufacturers as the root cause for non-uniformity is the differential heating of a substrate from the heater beneath.