Types of Reaction Bonded Silicone Carbide (RBSiC/SiSiC)

Types of Reaction Bonded Silicone Carbide (RBSiC/SiSiC)

At present, there are a large number of the manufactures to provide the Reaction Bonded SIC products to the different industries. Shandong Zhongpeng Special Ceramics Co., Ltd should be one of the best suppliers with the diversified Reaction Bonded SIC products, such as Nozzle and others in the Electric power, ceramics, kiln, iron and steel, mine, coal, alumina, petroleum, chemical, wet desulphurization, machinery manufacturing, and other special industries in the world.

The Reaction Bonded SIC can be divided into reaction-bonded silicon carbide and reaction-formed silicon carbide, according to whether the starting blank contains silicon carbide particles.

Reaction-bonded silicon carbide

Reaction-bonded silicon carbide refers to the process to form a silicon carbide composite. It is in the situation that the starting blank contains silicon carbide powder. In the reaction process, carbon and silicon react to form new silicon carbide phase and combine with original silicon carbide. The preparation process is as follows, which is a commonly used method:

Mixing silicon carbide powder, carbon powder and organic binder;

Forming the mixture dry and debonded;

Finally, gaining the reaction-bonded silicon carbide through silicon infiltration.

The reaction-bonded silicon carbide produced by this method generally contains coarse silicon carbide crystal grains and a high content of free silicon. However, this method has a simple process and low cost. At present,

Reaction-formed silicon carbide

The starting blank of reaction-formed silicon carbide only contains carbide. The starting blank of porous carbon is reacted with silicon or silicon alloy to prepare silicon carbide composite material. This process was first invented by Hucke. The Hucke method also has its drawbacks. Its preparation process is more complicated. The cost of this method is higher. At the same time, a large amount of gas evolves during thermal cracking. This will lead to easy cracking of china. Therefore, this method is more difficult to produce large-size products.

In addition, petroleum coke is used as raw material to prepare all carbon slabs, and then silicon carbide is formed. However, the properties of the materials prepared are relatively low. Its strength is generally lower than 400mpa. The uniformity of the obtained silicon carbide is not good. Because of the low cost of petroleum coke, the cost of this method is relatively low.

Summary

Compared with other preparation methods of silicon carbide ceramics, reaction bonded method has its unique advantages. At present, the research in this area mostly focuses on the study of sintering process and the characterization of the structure and properties of the products. However, the research on blank forming is relatively few. Although there are many studies on the reaction mechanism between them, there are few studies on the permeability kinetics, the reaction mechanism and the composition of the material phase of the alloying process. There are few studies on the preparation of materials with controllable properties and structures by the combination of silicon infiltration and other materials. These aspects still need to be studied.