DE1471372A1 - Process for the production of hollow bodies from carbonaceous material - Google Patents

Description

Process for the production of hollow bodies from carbonaceous

material

The invention relates to a "method for producing - Shaped bodies made of carbonaceous substances.

In the German patent ...... (official file number of the application P 26 358) a process for the production of hard, shiny, essentially impermeable, vitreous, chemically resistant, almost entirely made of carbon 'body' is described, whereby a phenol -Aldehyde resin in a vacuum or in an inert or reducing atmosphere is heated in such a way that the polymer can convert into carbon without changing the original pore of the resin , the product obtained then consisting of carbon and a maximum of 3% by weight of hydrogen .

Dr Ha / Ma

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cool by itself to room temperature and then reheat in vacuo or in an inert or reducing atmosphere with a temperature gradient of; ^J U ° 0 per hour "to at least 16OU ° G and can schliesslicii cool down by itself to room temperature.

If tubular bodies made of coal are to be obtained, so of course you need the tubular body first from the phenol-aldehyde resin and then shape it like this ernaiteneii tubular body char.

s a preferred embodiment of the invention for the production of tubular bodies from carbon material is therefore a liquid jrhenol-aldehyde resin in a cylindrical yorm given that then at high speed is rotated so that the resin assumes a cylindrical shape as a result of the centrifugal force exerted, whereupon one heated to cure the resin and then the cured one tubular body is removed from the porm and finally charred.

The stages of the process according to the invention are shown in the drawing. The liquid resin from stage 1 is poured into a cylindrical mold 2 , from which, after hotation in 4 and heating in 3, it is in the form of a tube

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It has now been found that this method can also be used Manufacture of tubular bodies can be used. The procedure is therefore particularly valuable when Such objects made of non-metallic materials are desired will.

Geniäas of the invention, from a cirMUt kohleixaltigen material hollow body when nan a phenol-aldehyde resin initially 'au desired Jörn deformed and then charred during a predetermined rirhitzungszyklus. The carbonization is preferably carried out in accordance with the above-mentioned German patent ...... (official file number of the application 1> 26 358) so that the resin is first heated to about 600 ° with a temperature gradient of 5 G per hour C, then a gradient of 10 ⁰ O per hour to about Ö25 ° C, then with a temperature gradient of 20 ° G per hour to at least 14CO ⁰ C and preferably to at least 1600 G and this temperature is then maintained for 24 hours, whereupon the product obtained is slowly cooled with a temperature gradient of 2ü ° C per hour.

According to another Verkohlungsmethode, which is also described in the said German patent specification ...... (registration number of the application P 26 356), heated to the resin with a temperature gradient of 1 ⁰ O per hour at about 500 C and increases then the temperature gradient to about 5 ⁰ C per hour until a temperature of ⁰ 9QO O. Oann allowed to the products obtained

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is taken out of the cured resin in FIG. This Resin pipe is then charred in stage 6 and a liohr of impermeable charcoal is obtained in stage 7.

Up to now it has been difficult to find tubular bodies obtained unfilled phenolic resins; according to the According to the invention, such tubular bodies can now not only be easily produced, but "own" them also an essentially uniform wall thickness. In the tubular bodies produced so far were Casting methods used, which is why the mechanical Strength of such llohie was much less than in those obtained by the process according to the invention. Furthermore, the tubular ones obtained according to the invention have Bodies have the additional advantage that their insides are not exposed to solid foreign substances during their manufacture substances came into contact, which is particularly important when the tubular body is used to melt Semiconductor materials are to be used.

The cylindrical shape used to manufacture the tubular body expediently has both ends a closure with a central through-bore which allows a gas atom, e.g. filtered Air, through the mold during molding and curing

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enable.

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enable. The cylindrical shape can, for example, consist of stainless steel and is rotated at such a speed that the liquid resin assumes a cylindrical shape as a result of centrifugal force} For example, a rotation speed of 2000 revolutions per minute for a mold with a diameter of 1 / g inch proved sufficient.

The heat required to cure the resin can be supplied by a hot gas stream passed through the mold or by means of thermosetting external heating, for example by means of resistance heaters. In the latter case, an outside temperature of about 110 ° 0 is required so that the necessary curing temperature of about 90-10O ⁰ G is reached. The following example illustrates the invention.

example

In a stainless steel mold that is at each end is provided with closures, which are separated from the mold itself and from its interior by polytetrafluoroethylene aam gives so much resin that it can form a Eohra with Taaatiimter Dieka u & er ®i & © certain length sufficient «When measuring the amount of resin to be filled the shrinkage occurring during hardening must be taken into account will.

Saeh

After filling the resin into the above ^l orm, it is rotated at a speed of about 2000 revolutions per i'iinute. The porin is then heated to at üich known manner of from η se, wherein the Ausaentemperatur ^ü is about 110 G, which for heating the Ötahlform to 90 - sufficient 1OO ⁰ O. The resin is cured after about 5 to 15 hours, the interlockings of the poriu are removed and the resin pipe is pulled out of the ϊοπη, -this "ear can then be charred in the manner described above.

Patent claims

9813/101 1 *> ORIGINAL

Claims (1)

U71372 - 7 - P a t e η t a n B ρ r ü c Ii g 1) Process ' / ax production of Holilko'rx) er on charcoal, 'daüurch ^ ektmnzeiciinet that a ± ^J henol-Aldehydhar3 ΐ' / ιιη. ^:: , υ1ΐΗΐ iii. the ^ ewtiniiciite form brought urici drain liiicJi a preventive UrbityAin ^ ycylclus kolilt v / ird. rl) Veri'aliren aur Manufacture of tubular I bodies ons kohlelialti ^ eifi iimaterial, thereby gelcennz-eiolmet, dci'j'j one lets a liquid phenol-aldehydes run into a cylindrical shape, which is then rotated at high speed, the resin assumes a tube shape as a result of centrifugal force, whereupon the mold is heated to harden the resin, the uncured tube is removed and finally charred after a predetermined heating cycle. 809813 / $ 105