Spalva Ir Savybės Iš Silicis Karbidas

Color and properties of silicon carbidePure silicon carbide is colorless and transparent crystal, industrial silicon carbide has fog color, light yellow, light green, dark green, light blue, dark blue and even black, the degree of transparency decreases in turn. Silicon carbide is generally divided into black silicon carbide (commonly used code C in China) and green silicon carbide (code GC) two categories. Which from the fog color to the dark green SiC are classified into green silicon carbide; Dark blue to black are classified as black silicon carbide.The reason for the color of silicon carbide is not fully understood. It is generally believed that it is related to the existence of various impurities. When more carbon is dissolved in the crystal, the SiC crystal is black; Aluminum has a great influence on the color of SiC, which can make the crystal brownish-black or black; Boron can also make SiC crystal black; The presence of iron has no effect on the formation of green silicon carbide; Some rare earth oxides (such as Ce2O3, etc.) can be green or dark green in SiC crystals. In addition, the dispersion of nitrogen atoms in SiC crystals can make the crystals turn green. The higher the concentration of nitrogen atoms, the darker the color of SiC crystals. Color and properties of sicThere is a certain statistical relationship between the color of silicon carbide and the type of crystallization. Green silicon carbide is basically 6H type, some contain 5%~10% of 15R type; Black silicon carbide is also mainly 6H type, but contains more 15R and 4H type (see Table 2-3-1). Color and properties of silicon carbide.

Iš the chemical composition, it can be seen that black silicon carbide contains free Si, C (grafito tipo), Fe203, MgO, Al203 and other impurities are common higher than green silicon carbide (žr. Table 2-3-2). But this is not good, black silicon carbide in the SiC content is higher than green silicon carbide is also a common thing; colorless transparent silicon carbide is not ne ne high in SiC, ir dažnai yra daugiau SiO2. Silicis karbidas spalva ir charakteristikos

Juoda ir žalia silicis karbidas turi šiek tiek skiriasi mechaninės savybės. It yra paprastai tikima kad lyginama su dviem, žalia siliciu karbidu is kietesni ir daugiau trapu=2c ir juoda silicis karbidas is kietesnis ir šiek tiek minkštesnis. Yra yra a grupė of comparative data: green SiC Vickers microhardness 32000~34000MPa, microbrittleness index 7.5~9; Black SiC is 31000~328000 MPa and 6.2~8.0. Žalia SiC is different from black SiC manufacturing process characteristics are: ① the use of purer raw materials; ② salt is added to the ingredients. Silicon carbide refractories common use black silicon carbide as raw materials, one is its high toughness, and the other is cheaper than green silicon carbide in price. Žalia ir juoda silicis karbidas smulkūs milteliai is daugiausia identifikuota pagal cheminę analizę, the former SiO2, Fe203, low content, the latter is high. Color and properties of silicon carbide