Graphite crucible is an indispensable medium material f […]
Graphite crucible is an indispensable medium material for metallurgy and chemical industry. Graphite crucible is corrosion-resistant, acid-alkali-resistant, and does not react with production materials, and has been well received by the market. So what is the difference between pure graphite crucible and clay graphite crucible?
First, pure graphite crucibles are essentially different from clay graphite crucibles. The production methods and formulations are different. Pure graphite crucibles are generally machined and processed by graphitized graphite electrodes, and the graphite content reaches above; while clay graphite crucibles are only made by roasting a certain proportion of graphite powder doped clay, the graphite content is around, and there is no After graphitization, strictly speaking, it cannot be a graphite crucible, and it should be called a clay crucible.
Second, there is a difference in color. The color of pure graphite crucible is black and has metallic luster. Because graphite is processed, graphite crucible has all the characteristics of graphite; the color of clay crucible is gray-brown, without metallic luster and rough surface. At this time, some friends will ask that the clay graphite crucible I have seen is black. Here, I want to emphasize that it is moisture-proof paint.
Third, the method of use is different. Clay graphite crucibles are generally used at room temperature and exposed to air to heat with charcoal fire. Pure graphite crucibles are used in electric furnaces.
Fourth, the cost is different. The production cost of pure graphite crucibles is about twice that of clay graphite crucibles, and the price is proportional to the value. Such a gap also verifies the market economy.
Flake graphite is used in many fields of industry. Different productions have different requirements for flake graphite itself. When flake graphite is used in wear-resistant materials, it pays more attention to the hardness value of flake graphite. Good effect.
1. What is the hardness of flake graphite.
The ability of a solid material to resist a hard object from crushing its surface is called hardness. Hardness is an aspect of the mechanical properties of solid materials.
Hardness is closely related to other physical and mechanical properties such as density and strength, as well as temperature. Due to the large anisotropy of the thermal expansion coefficient of flake graphite crystals, after cooling from high temperature, it will produce greater stress inside the grains. At low temperatures, the strength of flake graphite is lower, which is caused by the superposition of external stress and internal stress However, when heated to a certain temperature, the internal stress gradually decreases, so the hardness increases with increasing temperature.
2. The method for determining the hardness of flake graphite.
The methods for measuring the hardness of flake graphite include Brinell hardness, Rockwell hardness, Shore hardness, micro hardness, linear scale hardness and other methods.
The above is the relevant content about the hardness measurement method of flake graphite. When purchasing flake graphite products, you must clearly specify the specific requirements for use. The characteristics of flake graphite are required. Only when you have a clear demand, you can purchase the correct graphite products and develop your own.