DE173066C - - Google Patents
Info
- Publication number
- DE173066C DE173066C DENDAT173066D DE173066DA DE173066C DE 173066 C DE173066 C DE 173066C DE NDAT173066 D DENDAT173066 D DE NDAT173066D DE 173066D A DE173066D A DE 173066DA DE 173066 C DE173066 C DE 173066C
- Authority
- DE
- Germany
- Prior art keywords
- carbide
- carbon
- boron
- silicon
- crystals
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 17
- 229910052799 carbon Inorganic materials 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 9
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 9
- 229910052580 B4C Inorganic materials 0.000 claims description 8
- INAHAJYZKVIDIZ-UHFFFAOYSA-N Boron carbide Chemical compound B12B3B4C32B41 INAHAJYZKVIDIZ-UHFFFAOYSA-N 0.000 claims description 8
- HBMJWWWQQXIZIP-UHFFFAOYSA-N Silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 8
- 238000000137 annealing Methods 0.000 claims description 5
- 150000001247 metal acetylides Chemical class 0.000 claims description 5
- 229910052710 silicon Inorganic materials 0.000 claims description 4
- 239000010703 silicon Substances 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 3
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims description 2
- 229910052796 boron Inorganic materials 0.000 claims description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims 1
- 239000003245 coal Substances 0.000 description 5
- 239000003610 charcoal Substances 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 238000000227 grinding Methods 0.000 description 2
- 229910021417 amorphous silicon Inorganic materials 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000001143 conditioned Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000000615 nonconductor Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
- C04B35/56—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbides or oxycarbides
- C04B35/565—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbides or oxycarbides based on silicon carbide
- C04B35/573—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbides or oxycarbides based on silicon carbide obtained by reaction sintering or recrystallisation
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
- C04B35/56—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbides or oxycarbides
- C04B35/563—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbides or oxycarbides based on boron carbide
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Ceramic Products (AREA)
Description
PATENTAMT.PATENT OFFICE.
KAISERLICHESIMPERIAL
. Vorliegende Erfindung betrifft, ein Verfahren zur Herstellung von Formstücken, welche aus Siliziumcarbid oder Borcarbid· bestehen. Das Verfahren besteht darin, daß man zunächst aus reiner Kohle bestehende Körper formt, diese in fein gepulvertes Siliziumcarbid oder Borcarbid einbettet und einem Glühprozeß unterwirft.. The present invention relates to a method for the production of shaped pieces, which consist of silicon carbide or boron carbide. The procedure is that first of all, bodies consisting of pure charcoal are formed and then finely powdered Embeds silicon carbide or boron carbide and subjects it to an annealing process.
Die fraglichen Carbide wurden bekanntlichThe carbides in question became known
ίο bisher in der Weise hergestellt, daß man Kohle und Silizium durch Glühen des Gemisches der betreffenden Elemente direkt vereinigte. Dabei ergaben sich Kristalle von geringer Größe, welche mit keramischen oder anderen Bindemitteln-versetzt und gebrannt wurden, wenn sie z/B. zu Schleifrädern oder, dergl. 'geformt werden sollten. Aus den dichten Carborundurnkristallen lassen sich nicht etwa so ohne weiteres /homogene Körper formen, welche im Verhältnis zu den Kristallen groß sind und trotzdem ein dichtes Gefüge besitzen. Man hat vorgeschlagen, die Kristalle im elektrischen Ofen zusammenzuschmelzen; Dabei aber ergibt sich der große Mißstand, daß die zusammen^-1 geschmolzenen Carborundumkörper sich wegerj ihrer außerordentlichen Härte nicht oder doch nur außerordentlich schwierig bearbeiten lassen. '■■'■■ ; ; . ■ ■ :' ό.'..-/ .■;.;■'·.: ■/■ ίο hitherto manufactured in such a way that carbon and silicon were directly combined by annealing the mixture of the elements concerned. This resulted in crystals of small size, which were mixed with ceramic or other binders and fired if they were, for example,. should be shaped into grinding wheels or 'the like'. The dense carborundum crystals cannot be easily formed into homogeneous bodies which are large in relation to the crystals and nevertheless have a dense structure. It has been proposed to melt the crystals together in an electric furnace; Here, however, there is the great grievance that the co ^ - 1 molten Carborundum body does not wegerj their extreme hardness or leave but only process extremely difficult. '■■' ■■ ; ; . ■ ■ : 'ό .'..- /. ■;.; ■' ·. : ■ / ■
Gemäß einem anderen bekannten Verfahren wird ein aus zusammengebackenen Carbidkristallen bestehender Überzug auf einem Kern aus kleinkörniger Kohle oder einem Kohlenstab, der als Widerstand für elektrische Reduzieröfen dient, in der Weise gebildet, daß der Kern oder Kohlenstab mit kristallinischem' Siliziumcarbid oder Borcarbid oder den zur Erzeugung dieser Carbide dienenden Rohmaterialien umgebet! und dann zwecks Zusammenbackens oder zur Erzeugung der Carbide gleichzeitig mit der zu reduzierenden Beschickung geglüht wird. Der Überzug hat den Zweck, den Kohlewiderstand vor der Einwirkung der schmelzenden Masse zu schützen; er hat ein dichtes Gefüge, welches noch die einzelnen Kristalle, aus denen er zusammengesetzt ist, erkennen läßt; er ist Nichtleiter der Elektrizität, und die Form dieses Überzuges'entsteht im Ofen selbst und kann nicht vorher willkürlich bestimmt werden.According to another known method, one is made from caked Coating consisting of carbide crystals on a core of small-grain coal or a carbon rod, which serves as a resistor for electric reducing furnaces, in the manner formed that the core or carbon rod with crystalline 'silicon carbide or boron carbide or the raw materials used to produce these carbides! and then is calcined for the purpose of caking or to produce the carbides at the same time as the feed to be reduced. The purpose of the coating is to reduce the carbon resistance from the action of the melting Mass protect; it has a dense structure, which still contains the individual crystals, from which it is composed, reveals; he is a non-conductor of electricity, and the shape of this coating arises in the furnace itself and cannot be arbitrarily determined beforehand will.
Die vorliegende Erfindung befaßt sich hingegen nicht allein' mit der Herstellung von Überzügen und besonders nicht aus solchen aus zusammengebackenen Kristallen, da diese :' den beabsichtigten Zweck nicht erfüllen. Es ' handelt sich hier darum, den zu erzeugenden Körpern die genaue Form, die sie besitzen sollen, vorher, ehe sie dem Prozesse unterworfen werden, zu geben, da dadurch eine 6b sehr weitgehende Anwendung der Erfindung bedingt wird. Diese Form und die genaue Struktur der Stücke soll genau beibehalten werden und in keiner Weise durch den Prozeß beeinflußt werden. Es sollen nicht Überzüge allein auf Kohle erzeugt werden, sondern es sollen die Stücke vollständig durqh und durch in Siliziumcarbid oder Borcarbid übergeführt werden, da dies für viele Anwendungen unbedingt erforderlich ist.The present invention, however, is not only concerned with the production of Coatings and especially not from those made of caked crystals, since these : 'do not serve the intended purpose. It is a question here of the one to be generated Bodies the exact shape they should have before they are subjected to the process are to be given, as this makes a very extensive application of the invention is conditioned. This shape and the exact structure of the pieces is intended to be precisely maintained and will not be affected in any way by the process. It shouldn't Coatings are produced solely on charcoal, but rather the pieces should be completely through and through into silicon carbide or boron carbide, as this is for many Applications is absolutely necessary.
Während das vorstehend beschriebene Verfahren auf der bekannten Tatsache beruht, daß die Carbidkristalle in hoher Glut zusammenbacken, beruht das vorliegende Ver-'5 fahren auf der Erkenntnis, daß die Siliziumoder Bordämpfe in hochglühendem Zustande in die hochglühende Kohle eindringen, 'While the method described above is based on the known fact that the carbide crystals stick together in high embers, is based on the present ver-'5 drive on the knowledge that the silicon or board vapors are in a highly glowing state penetrate into the glowing coal, '
Zur Ausführung dieses Verfahrens werden Formgegenstände dadurch hergestellt, daß to zunächst die Körper aus reiner Kohle" ge-' formt und dann, in fein gepulvertes Siliciumcarbid oder Borcarbid eingebettet, einem Glühprozeß unterworfen werden, welcher je nach dem Umfang der Stücke kürzere oder längere Zeit dauert. ■; .: ■■"To carry out this process, molded articles are produced in that First the bodies were "formed" from pure charcoal and then, in finely powdered silicon carbide or embedded boron carbide, subjected to an annealing process, whichever takes a shorter or longer period of time depending on the size of the pieces. ■; .: ■■ "
; Durch das Glühen entsteht nach Auffassung des Erfinders auf den Kohlenstycken eine harte, unverbrennbare Schjchijuis Carbid, ;die bei fortgesetztem Glühen von außen nach 20/innen wächst, so daß bei genügend langem i Glühen die gesamte Kohle der Formstücke j in Carbid umgewandelt wird.; According to the inventor, glowing occurs on the carbon sticks a hard, incombustible Schjchijuis carbide, ; which grows from the outside to the inside as the glow continues, so that if it is long enough i annealing the entire carbon of the fittings j is converted into carbide.
Man verwendet am besten fein gepulvertes, amorphes Siliziumcarbid oder Borcarbid, da diese an Silizium bezw. Bor reich und trotzdem wohlfeil zu beschaffen sind.It is best to use finely powdered, amorphous silicon carbide or boron carbide, because these respectively to silicon. Boron are rich and yet can be obtained cheaply.
Die erhaltenen Stücke, welche also bereits ihre spätere Form besitzen, können z. B. als Schleifscheiben für die Zwecke der Feinmechanik und auch als nicht verbrennbare Körper überall da Anwendung finden, wo etwa Kohle in glühendem Zustande verwendet wird und mit der Zeit verbrennt, !wie z. B. bei Elektroden für elektrochemische ^5 Zwecke und dergl.The pieces obtained, which therefore already have their later form, can, for. B. as Grinding wheels for the purposes of precision mechanics and also as non-combustible bodies can be used wherever e.g. coal is used in a glowing state and burns over time, ! such as B. in electrodes for electrochemical purposes ^ 5 and the like.
Man könnte nach vorliegender Erfindung die Kohle auch nach der. Behandlung mit den Carbiden in geeigneter Weise entfernen. Will man z. B." beliebig: dicke oder dünne Röhren oder andere Hohlkörper, beliebigen Profils erzeugen, so kann man in der Weise vorgehen, daß man die Kohlenkörper in· ihrer vorläufigen Form nur so weit behandelt, daß ein innerer Kern aus Kohle vorhanden bleibt, der dann herausgebrannt wird.One could according to the present invention the coal even after the. Remove treatment with the carbides in a suitable manner. Do you want to z. B. "Any: thick or thin tubes or other hollow bodies, any To produce a profile, one can proceed in such a way that the carbon bodies are in · their provisional form only treated so far that an inner core of coal remains, which is then burned out.
Die' äußere Carbidschicht ist sehr feuerfest und fast unverbrenhbär, während der Kohlenkern schon bei Rotglut langsam verbrennt. Man braucht also das aus ' der äußeren Carbidschicht und dem inneren Kohlenkern bestehende Stück nur so lange zu glühen, bis der innere Kern verbrannt ist. Da das Verbrennen naturgemäß von, außen nach innen geschieht, so braucht der'Kohlenkern überhaupt nur teilweise verbrannt zu werden, um dann aus dem Rohr herausgeschoben werden zu können. ' .The 'outer carbide layer is very refractory and almost unburnable, while the coal core Burns slowly even when it is red heat. So you need that from the outside Carbide layer and the inner carbon core to glow only so long, until the inner core is burned. Since the burning naturally comes from the outside happens inside, the coal core only needs to be partially burned, so that it can then be pushed out of the pipe. '.
Claims (1)
Publications (1)
Publication Number | Publication Date |
---|---|
DE173066C true DE173066C (en) |
Family
ID=437907
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DENDAT173066D Active DE173066C (en) |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE173066C (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE923655C (en) * | 1951-10-26 | 1955-02-17 | Norton Ges M B H Deutsche | Process for cladding carbonaceous objects with silicon carbide |
DE1088863B (en) * | 1958-04-03 | 1960-09-08 | Wacker Chemie Gmbh | Process for the production of shaped bodies from silicon carbide |
DE1118079B (en) * | 1957-08-22 | 1961-11-23 | Carborundum Co | Process for the production of bodies from graphite and metal carbides |
DE1139427B (en) * | 1958-02-21 | 1962-11-08 | Carborundum Co | Process for siliconizing refractory bodies |
-
0
- DE DENDAT173066D patent/DE173066C/de active Active
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE923655C (en) * | 1951-10-26 | 1955-02-17 | Norton Ges M B H Deutsche | Process for cladding carbonaceous objects with silicon carbide |
DE1118079B (en) * | 1957-08-22 | 1961-11-23 | Carborundum Co | Process for the production of bodies from graphite and metal carbides |
DE1139427B (en) * | 1958-02-21 | 1962-11-08 | Carborundum Co | Process for siliconizing refractory bodies |
DE1088863B (en) * | 1958-04-03 | 1960-09-08 | Wacker Chemie Gmbh | Process for the production of shaped bodies from silicon carbide |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
DE2056567C3 (en) | Process for the manufacture of a carbon-containing, refractory product | |
DE173066C (en) | ||
DE1904381C3 (en) | Process for producing carbon bodies | |
DE1238376B (en) | Ceramic materials resistant to temperature changes | |
DE1250333B (en) | Refractory articles and processes for their manufacture | |
DE282748C (en) | ||
DE849669C (en) | Process for the production of dense, space-stable fireclay and refractory bricks | |
DE2736442C2 (en) | Process for the production of chemically bonded, carbonaceous, refractory bricks | |
DE174637C (en) | ||
DE666039C (en) | Process for the production of refractory masses and articles | |
DE1446978B2 (en) | Heat-resistant, elongated, rod-shaped or tubular body with silicon carbide framework and process for its production | |
AT22083B (en) | Process for the production of porous resistor bodies made of silicon carbide or boron carbide. | |
DE320247C (en) | Method for burning charcoal | |
DE76629C (en) | Process for the preparation of a crystalline carbon silicon compound | |
DE440745C (en) | Ceramic bodies with metal inserts in the form of wires, fabrics or perforated sheets | |
DE405236C (en) | Method of manufacturing refractory bodies | |
DE901391C (en) | Thermal protection for the autogenous surface hardening | |
DE437106C (en) | Process for the production of highly refractory magnesite masses | |
DE936738C (en) | Silicon carbide refractory body and process for its manufacture | |
DE971588C (en) | Zirconium boride refractory bodies and process for their manufacture | |
DE396690C (en) | Fireproof mass | |
DE154975C (en) | ||
DE1771738A1 (en) | Process for the production of graphite and charcoal bodies | |
DE908713C (en) | Process for the production of temperature-resistant, highly porous heat insulating bricks | |
DE175055C (en) |