Sol-gel Method
The base materials for the preparation of precursor sols can be the following materials.

Magnesium Nitrate and Aluminium tertiary butoxide.
Magnesium Nitrate and Boehmite particles
Magnesium Oxide and Boehmite particles
Magnesium Alkoxides and Aluminium Alkoxides

The sol is prepared with the action of nitric acid and the gel formed is dissolved in an alcoholic […]

Co precipitation Technique
In this method first mixture of Magnesium Nitrate or Magnesium chloride and Aluminium Nitrate are mixed in a ratio of 1:2 and 30% ammonium hydroxide is added to increase the pH of the system to level of pH 10 at a temperature of 60 to 80oC. In this stage reaction takes place […]

The spinel plays major role in applications like Super Refractory, Humidity Sensors, UV and IR Transparent Optics. These materials are Advanced Ceramic Engineering Materials and hence needs very high pure and ultra fine powder for the production applications. There are two major methods commercially available for preparation spinel powder.
1. Co precipitation Technique
2. Sol-gel Technique
The above preparation […]

Plasma Synthesis Process
In this process a mixture of reactant gases of SiH4, CH4 and H2 is injected in the tail flame of RF Plasma in presence of argon gas. The reaction after rapid cooling yields ultra fine and ultra pure silicon carbide powder.
The silicon verses carbon ratio can be modified as per our requirement by […]

Laser Synthesis Process
This method is used for the preparation of nanosized silicon carbide powder. In this process a mixture of reactant gases of SiH4 and C2H4 along with a carrier gas of argon is orthogonally injected in a special chamber under a laser beam. CO2 laser is used as the source of heating.
In the […]

Carbothermic Reduction of Silica Process
This process is most widely used for the preparation of Silicon carbide powder in large volumes of commercial scale production. In this process a mixture of silica and carbon is allowed to react in a special furnace under argon atmosphere at a temperature of 1500.C. The reaction yields a super fine […]

Acheson Process
Silicon carbide powder is commercially produced by this method. In this process a mixture of silica, carbon and small saw dust is heated in an electric furnace using a central core of graphite and coke as the electrical heating element.
The heating process is carried over at a maximum temperature of about 2700.C. The […]

Silicon carbide, a very important industrial application advanced ceramic raw material is prepared from silica and carbon. Silicon carbide exists in two modifications

Alpha form of hexagonal and rhombohedral poly types.
Beta form of cubic

Beta silicon carbide is considered as the low temperature phase and it converts into alpha form above 2000.C. However during […]

Plasma Synthesis Process
This process is used for the preparation of ultra fine and pure powder of silicon nitride. This process is very expensive however due to its advantage of producing ultra fine powder followed in most of the industries for producing silicon nitride powder.
In this process through a plasma arc chamber a mixture of SiH4 […]

Carbothermic reduction of Silica
In this process Silica powder and Carbon powder is heated in a special furnace under nitrogen atmosphere a temperature of 1300 to 1700.C so as to form silicon monoxide. Which is react with nitrogen to form silicon nitride.
The unreacted carbon is removed by oxidation by heating at 500.C in air. In […]