Silicon carbide powder has strong hygroscopicity and is very prone to moisture agglomeration in the air

Silicon carbide occupies an important position in the abrasive industry due to its stable properties. Silicon carbide is also an important auxiliary material for the R & D and manufacturing of new materials. The recently developed Saifei new material silicon carbide fiber project mainly produces, develops and sells ceramic precursors, silicon carbide fibers and other high-temperature resistant ceramic materials, which are widely used in various high-end products.

The types of silicon carbide include green silicon carbide and black silicon carbide. Green silicon carbide is green, high hardness, strong cutting ability, stable chemical properties and good thermal conductivity. The abrasive tool made of it is suitable for processing materials with high hardness and brittleness. Black silicon carbide, different in color from green silicon carbide; Hardness, it is much harder than glass and can be used as a glass knife. The manufacturing method of green silicon carbide is the same as that of black silicon carbide, but the purity of raw materials is required to be high. It is also formed at a high temperature of about 2200 ° C in a resistance furnace. It is green, translucent and hexagonal. Its SiC content is higher than that of black. Its physical properties are similar to that of black silicon carbide, but its properties are slightly brittle than that of black. It also has good thermal conductivity and semiconductor properties. Black silicon carbide is made of quartz sand, petroleum coke and high-quality silica by high-temperature smelting in resistance furnace. Its hardness is between corundum and diamond, and its mechanical strength is higher than that of corundum. It is brittle and sharp.

Many people know that silicon carbide raw materials are commonly used in abrasives. In fact, silicon carbide can also be used to produce silicon carbide protective tubes. The produced silicon carbide protective tubes are a kind of linear resistance, which can convert electric energy into heat energy. The resistance of this silicon carbide rod is difficult to measure at room temperature and is heated by itself. In addition, the moisture absorption of silicon carbide is very strong, so pay special attention to moisture-proof when storing silicon carbide, and try to avoid removing the moisture-proof film for storage; This can avoid moisture and shorten the drying time. The feeding environment shall be sealed as far as possible, so that it is not easy to fall into large particles with the air flow.

Silicon carbide is prone to problems when preparing slurry. What's the matter? It should be traced back to the inherent characteristics of silicon carbide Province:

1. Silicon carbide powder is easy to extrude and agglomerate in the process of packaging, transportation and storage; This requires workers to pay special attention in the process of preparing mortar pouring: pour slowly and control it to a bag for 2.5-5 minutes, so as to avoid that the micro powder will sink to the bottom and agglomerate, and the mixing will not work, which will be inconsistent with the actual ratio and affect the cutting.

2. Silicon carbide powder has strong hygroscopicity. It is very easy to be damp and agglomerate in the air, and the dispersion is reduced, which reduces the viscosity of the slurry. At the same time, false particles and agglomerates are formed in the slurry, resulting in the decline of cutting efficiency and cutting quality. Therefore, the exposed leakage of micro powder should be avoided for a long time in the air.

3. In areas with high environmental humidity, before using silicon carbide, it is best to put it in a 60-80 degree oven and bake it for more than 8 hours to optimize the indicators of silicon carbide powder. Such advantages: ① enhance the molecular activity of silicon carbide powder; ② It has stronger adaptability to cutting fluid; ③ The adsorption of powder particles is stronger, which increases the amount of steel wire belt mortar and enhances the cutting ability; ④ Micro powder has better fluidity and dispersion and reduces agglomeration.

4. The operator is required to: ① check whether the material bag is damaged. If it is damaged, it must be stored separately and not used again; ② Before feeding, remove the floating sand on the bag mouth and bag surface to avoid sundries brought by dumping