AT53533B - Process for the production of refractory, electrically conductive bodies. - Google Patents

Description

  

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  Process for the production of refractory, electrically conductive bodies.



   According to the present invention, refractory bodies that have electrical conductivity in the cold and can be used as conductive or resistance bodies, heating elements and the like for electrical purposes and, because of their high specific resistance and fire resistance and hardness, for crucibles, grinding stones and many similar purposes can be used, produced in that a compound consisting of silicon, carbon and oxygen is used to bind the mass.



   The production can take place, for example, in such a way that silicon is added to the mass to be bonded and the mass is then shaped according to one of the known molding processes and then heated in an atmosphere of carbon dioxide or carbonic acid, which is advantageous to white heat, in such a way, that the mass absorbs coal and oxygen. A compound of the composition Si CO, which is known per se and has extraordinary hardness, strength and good conductivity, is formed.



   The molding of the mass is done, for example, by simply pressing the pulverized mass into a suitable shape, some binding agent, for example some rosin or paraffin or clay or another suitable binding agent being added to the mass.



   After taking up the carbon oxide, the finished mass has in many ways similar properties to the previously known silicon mass, which consists of carbon, silicon and nitrogen and is obtained in an analogous manner by using silicon in the presence of Kohienston for binding by heating in a nitrogen atmosphere becomes.



   In the present method, instead of carbonic acid and carbonic oxide, a mixture of carbonic acid and carbonic oxide or both with nitrogen can be used. However, care must then be taken that the nitrogen is not present in too large an amount, otherwise the silicon is no longer in the carbon oxide, but in the
The main thing is that it only absorbs nitrogen.



     Any suitable material can be used for the production of the refractory body, for example silicon carbide or clay or the like. However, the procedure can also be such that the connection of silicon with carbon or the like can be used. 'H) is at the same time basic mass and binding agent, in that the whole mass is binding. The procedure is then such that finely powdered silicon is formed and
 EMI1.1
   becomes.

   If you take coarse-grained silicon instead of finely powdered silicon, you can take appropriate precautionary measures to ensure that the individual silicon particles are only converted into the chemical compound with carbon oxide on their surface and that unchanged silicon remains inside.



   If carbonic acid is used instead of carbonic acid, besides the chemical compound of silicon with carbonic oxide, some silicic acid is also formed, which is completely or partially volatilized when heated very strongly and remains in the mass when heated less.



  It is possible that, in addition to or instead of the compound with the composition Si ('0, other similar compounds of silicon, carbon and oxygen are also formed. The previous investigation, however, always resulted in a composition that very approximately corresponds to the formula Si CO.

** WARNING ** End of DESC field may overlap beginning of CLMS **.

 

Claims (1)

PATENT CLAIM: Process for the production of refractory, electrically conductive bodies, characterized in that silicon is formed with or without the addition of other substances and the shaped bodies are heated to white heat in an atmosphere of carbon dioxide or carbonic acid. ** WARNING ** End of CLMS field may overlap beginning of DESC **.