How to identify the quality problems of silicon carbide products

 

With the development of science and technology, China's cement industry is also improving its skills, so the requirements for refractory materials are also improving. Silicon carbide products are widely used in the cement industry because of their high temperature resistance. How to distinguish the quality of silicon carbide products?

 

Generally, the method to check the quality of silicon carbide products is very simple, that is, knock the middle of silicon carbide products with a hammer and distinguish them according to the sound. If there is a voiced sound in the sound, it can indicate that there is a gap or delamination in the middle of the silicon carbide product, which can not be used to build a cement kiln; If the sound is even but accompanied by residual sound, this situation can indicate that the internal structure of silicon carbide products is intact and can be put into processing and use; If the sound is crisp, just like the sound made by metal, it can show that the internal sintering degree of silicon carbide products is very high and it will be very difficult to process.

 

Some chemical compositions of silicon carbide products also determine its special properties. For example, under the conditions of constant and rapid temperature change, it is still intact. It can withstand great pressure during shear and is not easy to deform at very high temperature, which means that it has strong resistance to high temperature.

 

Main formula of silicon carbide products

 

China's industrial silicon carbide products are divided into black silicon carbide and green silicon carbide. When making silicon carbide products, whether to use black silicon carbide or green silicon carbide, the following silicon carbide product manufacturers will give you a detailed analysis of this problem.

 

Silicon carbide products have two common substrates, black silicon carbide and green silicon carbide, which belong to - SiC.

 

1. Black silicon carbide contains about 95% SiC, and its toughness is higher than that of green silicon carbide. It is mainly used for processing materials with low tensile strength, such as glass, ceramics, stone, refractory, cast iron and non-ferrous metals.

 

2. Green silicon carbide contains more than 97% sic97% and has good self sharpening property. It is mainly used for machining cemented carbide, titanium alloy and optical glass, honing cylinder liner and grinding high-speed steel tools. In addition, there is cubic silicon carbide, a yellow green crystal made by special technology. The abrasive tools made with it are suitable for ultra precision machining of bearings, and the surface roughness can be machined from RA32 ~ 0.16 μ m to ra0.5 μ m at one time 04 ~ 0.02 microns.

 

Types and uses of silicon carbide products

 

1. Application of nonferrous metal smelting industry

 

Silicon carbide has high temperature resistance, high strength, good thermal conductivity and impact resistance. It can be used as high temperature indirect heating materials, such as hard packed distillation furnace. Distillation furnace tray, aluminum reduction cell, copper smelting furnace lining, arc plate for zinc powder furnace, thermocouple protection tube, etc.

 

2. Application in iron and steel industry

 

The corrosion resistance, thermal shock resistance and wear resistance of silicon carbide are used. It has good thermal conductivity and can be used for large blast furnace lining to improve its service life. Making use of its characteristics of high thermal conductivity, high heat dissipation and high thermal strength to make thin plate kiln furniture can not only reduce the production capacity of kiln furniture, but also improve the production capacity and product quality of kiln furniture and shorten the production cycle. It is an ideal indirect material for firing and sintering ceramic glaze.

 

3. Application of metallurgical beneficiation industry

 

The hardness of silicon carbide is second only to diamond and has strong wear resistance. It is an ideal material for wear-resistant pipes, impellers, pump chambers, cyclones and hopper liners. Its wear resistance is 5-20 times that of cast iron and rubber. It is also one of the ideal materials for aviation runway.