Time：2023.03.22Browse：1
1. Broken: Graphite mold directly contacts the matrix powder containing diamond. The contact surface is in a high pressure state. The hardness of diamond and graphite mold is too poor. The surface of the mold that is in contact with diamond tool head will produce concave pits.
Second, the type of damage: During the sintering process, the matrix powder infiltrates into the oxidation gap of the graphite mold under the melting state, resulting in the adhesion between the tool head and the mold, making it difficult for molding. The repeated attack of the mold can remove the mold, which causes the lack of edges and metal pit in the mold.
Third, the wear size of graphite molds is very poor: some substrate powder will be squeezed out of the mold surface in the melting state to attach to the graphite material. Before using the mold next time, metal residues must be removed manually, which causes the shape and size of the mold to exceed the tolerance.
Fourth, surface oxidation and cracking: Because there is no protection of the atmosphere during the hot -pressing sintering process, the graphite and the air are directly contacting, and the surface oxidation will inevitably occur at high temperature. The higher the temperature, the faster the oxidation speed; Only leave some carbon and gray points, stones can be found at the actual production site. After a period of time, the surface of the mold will produce pores and carbon powder.
V. Fracture: The cause of this damage is that the side plate of the diamond knife head is not tightly clamped, resulting in an unbalanced pressure drop on the head, leading to the horizontal shear force.
2023-12-12Raw material cost: The price of graphite molds is influenced by the cost of raw materials. The main raw material for graphite molds is graphite material, and its price fluctuations will directly affect the price of graphite molds. The rise or fall in raw material prices can lead to fluctuations in graphite mold prices.
Graphite plays a pivotal role in battery technology. As a negative electrode material for lithium-ion batteries, graphite has become a key component of modern battery technology due to its excellent lithium storage performance and cycle stability.
1、 Fast speed;Graphite discharge is 2-3 times faster than copper, and the material is not easily deformed. It has obvious advantages in the processing of thin ribbed electrodes. Copper has a softening point of around 1000 degrees, which is prone to deformation due to heating. The sublimation temperature of graphite is around 3650 degrees, and compared to copper, the thermal expansion coefficient of graphite material is only 1/30 of that of copper material;2、 Lightweight;The density of graphite is only 1/5 of that of copper. When using large electrodes for discharge machining, it can effectively reduce the burden on machine tools (EDM) and is more suitable for the application of large molds;3、 Low loss;Due to the presence of C atoms in spark oil, during discharge machining, high temperatures cause the C atoms in spark oil to decompose, forming a protective film on the surface of the graphite electrode, compensating for the loss of the graphite electrode;4、 No burrs;After the copper ele2024-03-19The key role of graphite in battery technology
2023-10-26Graphite electrode materials have the following six advantages
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