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Silicified graphite is a kind of composite material which is coated with silicon carbide layer on the surface of graphite material. The hardness of silicified graphite is actually the hardness of SiC, which is only inferior to that of diamond, boron nitride and boron carbide, which is higher than that of tungsten carbide and three aluminium oxide two. The production methods of silicified graphite are 3 methods, such as chemical vapor deposition (CVD), chemical vapor reaction (CVR) and liquid silicon infiltration reaction. Chemical vapor deposition (CVI) method The gas containing silicon and carbon is decomposed by high temperature graphite matrix, and SiC is deposited on the surface of graphite matrix. The raw material is three methyl silane (CH3SiC 3), four…
Quartz crucible, with high purity, strong heat resistance, large size high precision, good heat insulation, energy saving, stable quality and other advantages, more and more widely used. The inspection of the quartz crucible is a very important step, and the detection of the quartz crucible is developing towards the field! 1. quartz crucible can be used below 1450 degrees, divided into two kinds of transparent and opaque. The translucent quartz crucible fabricated by arc method is the basic material for drawing large diameter monocrystalline silicon and developing large-scale integrated circuits. Today, the world's semiconductor industry developed countries have replaced the small transparent quartz crucible with this crucible. He has high purity and strong heat resistance, large size high precision, good…
The process of graphite impregnation is to fill the pores of carbon graphite materials with different forms of carbon. The purpose of the dense and impregnated graphite impregnation process is to produce high density products, High density of liquid penetration. However, the densification is limited, it is impossible to require all the pores of dense products, but only A layer that is not dense enough for the product. Deposited on the surface of the graphite carbon covered layer, can significantly change the performance of another, because The deposited carbon layer becomes another working surface. The characteristics of the dense carbon layer will be described below. Two, the need to dip the product of 1 small size graphite electrode and joint…
