Time：2023.05.17Browse：1
Electric spark processing is a new type of processing process in the mechanical manufacturing industry. Electric spark processing can process many metals with large hardness and can be processed. Copper materials can also use graphite materials. Graphite materials used for electrical electrodes used for electrical sparks must have the following conditions:
(1) The structure is dense and uniform in tissue, and there should be no coarse particles and large pores;
(2) There is a high mechanical strength and good processing performance. It can process complex shapes or sharp corners and thin slices;
(3) Graphite tool electrodes, there are certain losses during the processing of electricity, this loss should be as low as possible;
(4) The discharge characteristics are stable and the processing speed is fast. Therefore, graphite machining is generally used with graphite structure graphite or exquisite particle structure graphite. It is best to have the same sex in physical properties. Therefore, the current Chinese electro -spark processing graphite material market is more used in the same -sex graphite of the fine particle structure.
In 2005, it was estimated to be 4000T in China in China. Among them, about 25%of the high -end graphite were used, and about 75%of the low -grade graphite were used. In the future, a 10%annual increase may increase. Import high
2023-04-20Graphene already exists in nature, but it is difficult to peel off a single layer structure. Graphene is stacked layer by layer to form graphite, with a thickness of 1 millimeter containing approximately 3 million layers of graphene. A pencil lightly scratches on paper, leaving traces that may be several or even just one layer of graphene.
SiO2, C, and SIC's reaction freedom can see Table 1.The freedom of reaction between SIO2, C and SICThe reaction of carbon and silicon is shown in Figure 2 with changes in temperature.The reaction of carbon and silicon changes with the temperatureThe thermal treatment temperature of graphite matrix materials (reflects its graphite), thermal expansion coefficient, pore rate and pore diameter size and distribution have a great impact on the seepage process. In order to obtain a good performance of siliconized graphite, the thermal expansion coefficient of graphite matrix materials should be as close to SIC as much as possible. It is best to use the same -sex graphite. The open air pores should be 12%to 15%. The above methods can be carried out according to the needs. For example, first use the CVR method, and then use the CVD method to process it, so that the obtained siliconized graphite is not breathable and free of free silicon. Silicon goblin has the characteristics of carbon and sil2023-06-06The characteristics of high performance of silica graphite
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