Method for short-term production of isotropic superfine structure isostatic pressing formed graphite

An isotropic and fine-structure technology, which is applied in the field of isostatic graphite with isotropic ultra-fine structure in a short process, can solve the problems of high discharge consumption, low pass rate, high cost, etc., and achieve excellent use effect and uniform temperature Improvement of performance and shortening of manufacturing process

Inactive Publication Date: 2017-06-27
辽宁丹炭科技集团有限公司
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Problems solved by technology

Domestically produced 8μm EDM graphite has an isotropy of 1.15--1.25, a flexural strength of 45--53MPa, a compressive strength of 98--108MPa, a Shore hardness of 53-62, and a resistivity of 13-14μΩm , high discharge consum

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  • Method for short-term production of isotropic superfine structure isostatic pressing formed graphite

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Embodiment Construction

[0014] Attached below in conjunction with the instructions figure 1 The present invention is further explained.

[0015] A short-process method for producing isostatically pressed graphite with homogeneous ultrafine structure. The processing process is: crushing mixed coke, primary grinding → batching → pitch melting → mixing and cooling → secondary grinding → bagging vacuum → isostatic Compression molding→primary roasting→high pressure impregnation→secondary roasting→graphitization.

[0016] Asphalt melting uses high-temperature modified asphalt as a binder.

[0017] The primary grinding particle size is 8μm, and it is formed on a Φ1500mm*4200mm isostatic press. The size of the green body is 1660mm*830mm*390mm, and the green body density is 1.53---1.55g / cm 3 .

[0018] The primary roasting adopts positive pressure roasting in a trolley furnace, the qualification rate of primary roasting reaches 99.5%, and the density of the first roasted product reaches 1.66---1.68g / cm 3 , The compr...

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Abstract

The invention relates to a method for short-term production of isotropic superfine structure isostatic pressing formed graphite. The method comprises the following steps: crushing mixed coke, performing primary powder milling, blending materials, melting asphalt, kneading and cooling, performing secondary powder milling, bagging and vacuuming, performing isostatic pressing formation, performing primary roasting, performing high-pressure soaking, performing secondary roasting, and performing graphitization, wherein the step of melting asphalt refers to that high-temperature modified asphalt is adopted as an adhesive. The preparation procedures of the method are greatly shortened, the production period is shortened by 90 days when being compared with that of a conventional domestic production procedure, and a short-term process is achieved. Unique positive pressure roasting of a bogie hearth furnace is adopted for the primary roasting, the temperature uniformity of the positive pressure roasting is greatly improved when being compared with that of conventional negative pressure roasting of an annular furnace, the pass percentage of the primary roasting is as high as 99.5%, and meanwhile the yield of the primary roasting is up to 94% or greater.

Description

Technical field [0001] The invention creates a technology for manufacturing isostatic ultrafine structure isostatic graphite of a new type of special graphite material, and is a method for producing isostatic ultrafine structure isostatic graphite in a short process. Background technique [0002] With the rapid development of nuclear power, photovoltaics, optical fiber manufacturing, semiconductor manufacturing, rocket and missile launching, EDM and other fields, the demand for special graphite-isostatic graphite with isotropic ultrafine structure is increasing, especially It is the high-end ultra-fine structure isostatic graphite that all relies on imports. The reason is that the raw materials, process technology and equipment systemization technology have not broken through. Among them, the raw materials and stand-alone equipment can also be imported from abroad at a high price, but the manufacturing process is used by foreign carbon giants. Seal the lock tightly. Domestic man...

Claims

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Application Information

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IPC IPC(8): C01B32/205C01B32/21
Inventor 蒋莉
Owner 辽宁丹炭科技集团有限公司
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