A kind of preparation method of high-strength isostatic pressing graphite
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An isostatic pressing, high-strength technology, applied in the field of static pressing graphite, can solve the problem of not being able to guarantee the mixing of pitch mesocarbon microspheres and paste powder in a certain ratio, and achieve the effect of prolonging the tiling time.
Active Publication Date: 2022-07-01
SINOSTEEL NEW MATERIAL ZHEJIANG
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[0006] For above problem, the present invention provides a kind of preparation method of high-strength isostatic graphite, by in carbon microsphere mixing step, utilize the production raw material mixing equipment of high-strength isostatic graphite, paste powder and asphalt intermediate Phase carbon microspheres are uniformly mixed according to the ratio. During the mixing process, the pitch mesocarbon microspheres are preheated, so that the heated pitch mesocarbon microspheres are injected into the flat paste powder layer, and the asphalt mesocarbon microspheres are used. The heat carried by the mesocarbon microspheres is bonded to the asphalt in the paste powder layer to realize the mixing and bonding of the asphalt mesocarbon microspheres and the paste powder, which solves the problem that the traditional mixing equipment cannot guarantee the Technical Problems of Partial Mixing of Pitch Mesophase Carbon Microspheres and Paste Powder
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Embodiment 1
[0077] like figure 1 As shown, a preparation method of high-strength isostatic graphite includes the following steps:
[0078] Step 1, raw material selection, crushing the calcined petroleum coke or pitch coke raw material and grinding to obtain raw material powder with a median particle size D50 of 8-15um;
[0079] Step 2, kneading process, mix the raw material powder prepared in step 1 uniformly in the kneading pot and preheat to 150 ℃, add high temperature coal pitch with a softening point of 110-120 ℃ as a binder for kneading, at 190-200 ℃ After kneading at a temperature of ℃ for 60 minutes, the pot is taken out, and the paste is cooled and then ground for a second time to obtain a paste powder with a median particle size D50 range of 25-50um;
[0080] Step 3, carbon microspheres are mixed, and the paste powder prepared in step 2 is mixed with pitch mesocarbon microspheres with a median diameter of D50 ranging from 2-5um and a volatile content of 6-10% in a ratio of 10:1-...
Embodiment 2
[0127] like Figure 2 to Figure 5 As shown, a raw material mixing equipment for the production of high-strength isostatic graphite includes:
[0128] Mounting rack 1, the mounting rack 1 is arranged in a frame;
[0129] Reaction tank 2, the reaction tank 2 is set in an hourglass shape, and includes two tank bodies 21 in a funnel shape and facing each other. The tank body 21 located above is provided with a storage cavity 211. The storage cavity Raw material powder is stored in 211, and a receiving cavity 212 is arranged in the tank body 21 located below. A material pipe 213 is arranged on the flat side wall;
[0130] Feeding head 3, the feeding head 3 is arranged between the tanks 21, it includes an inner pipe 31 communicating with the tank 21 and a feeder 32 arranged around the inner pipe 31, the feeding The inner wall of the container 32 cooperates with the outer wall of the inner tube 31 to form a material cavity 33 for accommodating carbon microspheres, and a feeding po...
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Abstract
The invention relates to the technical field of high-strength isostatic pressing graphite preparation, in particular to a preparation method of high-strength isostatic pressing graphite, which comprises the following steps: raw material selection → kneading processing → carbon microsphere mixing → green body preparation → roasting → graphite The mixing of carbon microspheres includes feeding→preheating→laying raw materials→air flow→rotation switching→output. In the mixing step of carbon microspheres, the paste powder and pitch mesocarbon microspheres are uniformly proportioned according to the proportion. Mixing, in the mixing process, by preheating the pitch mesocarbon microspheres, the heated pitch mesocarbon microspheres are injected into the flat paste powder layer, and the heat carried by the pitch mesocarbon microspheres is used to interact with the mixture. The asphalt in the paste powder layer is bonded to realize the mixing and bonding of the asphalt mesocarbon microspheres and the paste powder, which solves the problem that the traditional mixing equipment cannot guarantee the asphalt mesocarbon microspheres and paste in each part even after mixing. The technical problem of mixing material and powder ratio.
Description
technical field [0001] The invention relates to the technical field of high-strength isostatic pressing graphite preparation, in particular to a preparation method of high-strength isostatic pressing graphite. Background technique [0002] Isostatically pressed graphite is a new type of carbon / graphite material with a series of excellent properties, such as high temperature resistance, corrosion resistance, high strength, good electrical conductivity, low thermal expansion coefficient, good thermal shock resistance, etc., and has isotropic properties It is widely used in the production of thermal field graphite parts of Czochralski single crystal furnaces, graphite thermal field parts of polycrystalline silicon smelting furnaces, heaters, crucibles and other components for compound semiconductor manufacturing, nuclear reactor core structures, EDM electrodes, metal Graphite molds for continuous casting, etc., have extremely high industrial application value. [0003] Existin...
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