Graphite electrode refers to a kind of refractory made […]
Graphite electrode refers to a kind of refractory made of petroleum coke and bituminous coke as aggregate and coal tar as binder through raw material calcination, crushing and grinding, batching, kneading, molding, roasting, impregnation, graphitization and mechanical processing. High-temperature graphite conductive material is called artificial graphite electrode (abbreviated as graphite electrode), which is different from natural graphite electrode prepared by using natural graphite as raw material.
You will choose the right graphite electrode material
We all know that graphite has the characteristics that other metal materials cannot replace. As a selection material, graphite electrode materials often have a lot of confusing characteristics in the actual selection of materials. There are also many grounds for choosing graphite electrode materials, but the main ones are as follows: Four criteria:
For materials with the same average particle size, the material with a small resistivity will have a correspondingly lower strength and hardness than the material with a high resistivity. That is, the speed and loss of the discharge differ. Therefore, the inherent resistivity of graphite electrode materials is very important to select materials in practical applications. The choice of electrode material is directly related to the effect of discharge. To a large extent, the selection of materials is appropriate, which determines the discharge speed, processing accuracy and surface roughness.
In the special graphite industry, the universal hardness test standard is the Shore hardness measurement method, and its test principle is different from that of metals. Although in our subconscious understanding of graphite, it is generally considered to be a relatively soft material. However, actual test data and applications show that the hardness of graphite is higher than that of metal materials. Due to the layered structure of graphite, it has very superior cutting performance during cutting. The cutting force is only about 1/3 of that of copper. The surface after machining is easy to handle.
However, due to its higher hardness, the loss of the tool during cutting will be slightly greater than that of metal cutting tools. At the same time, high-hardness materials have better control of discharge losses. Therefore, the Shore hardness of graphite electrode materials is also one of the selection criteria for graphite electrode materials.