Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05C9/00—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important
  • B05C9/08—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material and performing an auxiliary operation
  • B05C9/12—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material and performing an auxiliary operation the auxiliary operation being performed after the application
• • 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

Definitions

• the invention relates to an apparatus and a method for silicating carbonaceous workpieces.
• the process of silicating substances is a refining process which serves to give carbonaceous workpieces increased stability.
• Basic reaction is the fusion of carbon and silicon within the workpiece to silicon carbide.
• a method for silicating carbon-containing materials is disclosed, for example, in EP 0 956 276 A1. According to that method, the carbonaceous material to be silicided is heated together with bound powdered silicon so that the molten silicon penetrates into the material and at least partially reacts inside with silicon carbide.
• this method is only batchwise feasible, which sets the commercial use of the method certain limits.
• the method disclosed therein is spatially distributed over several chambers, in each of which special temperature and pressure conditions prevail.
• the workpiece to be siliconized is positioned one after the other in the respective chambers in order to heat up, to react with the silicon and to cool down. If the workpiece has been transferred from one chamber to the next, then a new workpiece can be introduced again into the first chamber. Although this can improve the throughput, but only to a limited extent.
• a device for silicating carbonaceous workpieces comprises: a chamber having an inlet and an outlet, in the interior of which there is a silication device; and a conveying means having a stationary holding part extending between the inlet and the silicifying means and between the silicifying means and the outlet, and a conveying part comprising two beams movable parallel to each other, both the holding part and the conveying part having respective pairs of grooves, wherein the grooves of each pair face each other with respect to a longitudinal axis L of the conveyor and are adapted to receive a rod or workpiece itself and wherein the carriage member is drivable to a repeated cycle of movement comprising a lifting, advancing and lowering movement the rods resting on the holding part are cycled along the longitudinal axis L from the inlet to the silicating device and from there to the outlet.
• the core of the device is thus in addition to the silication itself the specially designed conveyor.
• the workpieces to be treated can be moved intermittently through the interior of the chamber onto the siliconizing device and away from it after the siliciding process.
• the work piece (s) attached to one of the bars is conveyed along the holding part towards the silicating means, and subsequently from the silicating means to the outlet of the chamber.
• the bars of the conveying part engage in the lifting step of the movement cycle from below to the rods or support or the workpiece itself, which are each stored in a pair of grooves of the holding part on.
• the rods are thus removed from the respective pair of grooves of the holding part and are now in a pair of grooves of the carriage on.
• the bars resting in the grooves of the bars of the conveying part are conveyed in the forward direction defined by the sequence of inlet-silo outlet, over a preset distance.
• the rods in the lowering step again placed on the holding part, but this time in pairs of grooves which are spaced in the forward direction of the originally associated each rod pair of grooves, for example, in each case adjacent in the forward direction groove pair. In this way, a gradual onward transport of the rods takes place in the forward direction through the chamber.
• the silicator itself is generally the warmest point in the chamber because it contains silicon in a molten state. However, the temperature may also be controlled so that the preheat temperature is set higher than the silicidation temperature. Conversely, the workpieces cool on their way from the siliconizing device to the outlet of the chamber.
• the inlet and the outlet are preferably formed in the form of sluices, which allow the insertion of the mounted on the rods workpieces without affecting the conditions in the chamber.
• Suitable locks are known in the art, which is why their specific design should not be discussed here.
• the carriage described allows in a simple manner, the gradual movement of the attached to the rods workpieces within the chamber. Due to the change of the rods from the pairs of grooves of the holding member in pairs of grooves of the conveying member and of the pairs of grooves of the conveying member in pairs of grooves of the holding member during a movement cycle by submitting the rods by means of the bars of the conveying member finds only a small mechanical stress during transport and settling instead of.
• the transport device itself can thus be designed without movable mechanical closure parts within the high-temperature region which prevails in the chamber. This simple mechanism makes the conveyor wear resistant within the extreme temperature conditions prevailing in the chamber.
• all the critical elements of the conveyor such as the drive, control and the like, are conveniently located outside the chamber, while the part of the conveyor within the chamber is confined to the moving beams of the conveyor and the support member.
• the parts of the conveying device located in the chamber can, for example, be made of graphite, in particular of fine-grained graphite, or of CFC components, in order to withstand the high temperatures without damage.
• the conveyance part may be realized in the form of two bars parallel to each other.
• the bars of the holding part are fixed in place within the chamber.
• Both the bars of the holding part and those of the Carriage parts each have pairs of grooves, which are lined up next to each other along the longitudinal axis L of the conveyor.
• a first beam of the conveying part extends in a direction adjacent to a first beam of the holding part
• a second beam of the conveying part extends in the same direction adjacent to a second beam of the holding part.
• a beam of the conveying part is adjacent to a beam of the holding part between the two beams of the holding part, while the second bar of the conveying part is arranged adjacent to the other beam of the holding part outside of the space defined by the bars of the holding part.
• the cycle of movement may be a closed one, comprising in this order a lifting, a feeding, a lowering and a return movement.
• the return movement of the bars of the transport part takes place, while no rods rest on the grooves of the transport part.
• the bars of the conveying part move approximately in a rectangular movement, wherein after each cycle of movement, the starting position of the conveying part is reached again.
• the bars of the conveying member are thus displaced in the forward direction only slightly opposite to the holding member, wherein the term "slightly" refers to the forward movement in each cycle with respect to the total distance to be traveled by the rods from the inlet via the silicator to the outlet.
• This fraction is in particular less than 20%, preferably less than 10%.
• a first section of the holding part which extends between the inlet and the siliconizing device, is arranged spatially above a second section, which extends between the siliconizing device and the outlet. That means the inlet and the outlet are arranged on the same side of the chamber, for example directly with each other.
• the conveying device first conveys the rods in a first direction from the inlet to the silacifying device, then downwardly therefrom and in a second step from the silicating device to the outlet, the second direction, for example, being antiparallel to the first direction can be.
• the silicating device may, for example, comprise a pelvis in which two rolling wicks are positioned, the transporting device being designed to position a rod resting on the holding part in a cycle of movement between the rolling wales and to pick it up again in a subsequent cycle of movement and deposit it on the holding part.
• This embodiment is particularly advantageous when the workpieces have approximately a circular disk shape, which facilitate the successive immersion of the workpieces in the silicon melt contained in the basin by the rotation of the rolling wicks.
• other known mechanisms can be used to submerge the supplied by the conveyor workpieces in the basin with silicon melt.
• the invention also relates to a method of siliconizing carbonaceous workpieces comprising the steps of: a) attaching one or more workpieces to a bar; b) depositing the bar on a pair of grooves of a conveyor which includes a stationary support member extending between an inlet of a silication chamber and a siliconizer therein and between the silicator and an outlet from the siliconizing chamber, and comprising a carriage having two beams movable in parallel with each other; c) conveying the bar by lifting it once or repeatedly, advancing and lowering it by the conveying part onto the holding part, so that the bar is gradually transported from the inlet to the silicating device; d) silicating the workpiece in the sizing apparatus; and e) conveying the rod by repeatedly lifting, advancing, and lowering it by the carriage member onto the support member so that the rod is progressively transported away from the sizing apparatus to the outlet.
• this process is a continuous process using the prescribed apparatus. Since several bars can be conveyed simultaneously by means of the conveyor, there are always a number of workpieces in different stations of the process inside the chamber.
• the step a) of attaching or attaching the workpiece to a rod generally takes place in practice outside the chamber, for example in a lock at lower temperatures than those prevailing in the silication chamber, as stated above. With a suitable geometry can be dispensed with a rod when the workpiece can be stored directly on the conveyor.
• the movement cycles of lifting, advancing and lowering may be identical to each other. This means that the length of the advancement and the height of the stroke or the lowering in each movement cycle is the same. So there is a uniform movement over the entire process away, which brings in terms of the control of the process flow the advantage of simplicity.
• the cycle of movement may be a closed one, comprising in this order a lifting, a feeding, a lowering and a return movement of the beams of the conveying part, wherein during the return movement of the beam, the rod is received in a pair of grooves of the holding part , In this way, the "waiting time" while holding the rods on the holding part be used for the return of the beams of the transport part.
• the bars of the transport part are also less stressed in this type of movement, since they only have to be moved by small movement units.
• the silicating means includes a basin filled with silicon melt, the transporting into the silicating means comprising depositing the on-rod rolling pastes within the basin.
• the rods can also be dipped into the silicon melt by means of another device for lowering or deposited on stationary wicks.
• Step a) comprises guiding the rod through a passage opening of the workpiece.
• the respective workpiece is in other words, as it were “threaded on the rod".
• several workpieces can be positioned side by side on a rod. In this way, the throughput of workpieces per unit of time increases in the process according to the invention.
• the through holes may be those resulting from the nature of the workpiece, as well as those which are recessed at appropriate locations for attachment to the rod.
• a sleeve of silicon repellent material can be positioned between the rod and the workpiece.
• any other type of impregnation of the rod against sticking to the workpiece is also possible to facilitate removal of the finished workpiece from the rod.
• step e) can take place in a spatial area below that of step c).
• the waste heat of the cooling workpieces which just pass through the process step e), serve to heat those workpieces that are in the stage of process step c).
• the process economy is further supported.
• Figure 1 is a side view of workpieces on a rod, as used in the method according to the invention.
• FIG. 2 shows a top view of a first embodiment of a device according to the invention for silicating carbonaceous workpieces
• FIG. 3 is a side view of the embodiment of FIG. 2; FIG. and
• Fig. 4 shows an alternative embodiment of the device according to the invention.
• FIG 1 an exemplary arrangement of workpieces 1 is shown, each having a through hole 1 a, via which they are guided on a rod 10 and a round bar.
• brake disks are examples of workpieces 1 to be siliconized by means of the method according to the invention.
• other workpieces and semi-finished products can also be subjected to finishing by the method according to the invention.
• Non-limiting examples of these are plates, tubes, rods and other geometries.
• a) of the method according to the invention the workpieces 1 are mounted on the rod 10.
• the workpieces 1 are held securely on the rod by the arrangement shown here, without the need for special brackets are required.
• the latter can be provided, for example, with an anti-adhesion layer, ie a silicon-repellent layer, for example of boron nitride, silicon nitride or comparable materials.
• an anti-adhesion layer ie a silicon-repellent layer, for example of boron nitride, silicon nitride or comparable materials.
• the chamber 100 includes an inlet 110 and an outlet 120 which, in this embodiment, face each other across the interior of the chamber 100. Between the inlet 110 and the outlet 120 there is a siliconizing device 130, here in the form of a basin 131 filled and heated with silicon melt. It is important that this part of the chamber 100 be kept at a high enough temperature to keep the silicon in the liquid state. in the
• Cymbals 131 are rolling wicks 132, here two rolling wicks 132, inserted, which are rotatable about their respective axis to submerge the workpieces 1 sequentially along its circumference in the melt (step d)).
• the device according to the invention further comprises a conveying device 200, which contains a holding part 210 with a first bar 21 1 and a second bar 212.
• the beams 21 1 and 212 are disposed substantially parallel to one another along a longitudinal axis L of the conveyor 200, with each beam 21 1, 212 having grooves 210 a.
• a groove 210a of the first bar 21 1 together with a groove 210a opposite the longitudinal axis L forms a pair of grooves for receiving a bar 10.
• a carriage member 220 of the conveyor 200 also includes a first beam 221 and a second beam 220 disposed in parallel with each other along the longitudinal axis L of the conveyor 200.
• the first beam 221 of the carriage part 220 is arranged adjacent to the first beam 21 1 of the support part 210 in a first direction (in the figure on the left).
• the second beam 222 of the carriage member 220 is adjacent to the second beam 212 of the support member 210 in the first direction (in the figure on the left) arranged.
• the beams 221, 222 of the conveying part 220 include respective grooves 220a arranged in pairs.
• both the holding part 210 and the conveying part 220 of the conveying device 200 are divided into two sections, wherein in the first section, in front of the silicating device 130 (on the left) the step c) of guiding the bars 10 to the Silizeurss worn takes place.
• the first section in front of the silicating device 130 (on the left) the step c) of guiding the bars 10 to the Silizeurss worn takes place.
• the bar 222 together with the bar 221 now performs a closed cycle of movement, as indicated by the closed line on the left in FIGS. 3 and 4. In this case, in each cycle of movement, each rod is displaced to the right against the basin 131 of the siliconizing device and in turn deposited on the grooves 210 a of the
• the workpiece 1 shown in the middle of FIG. 3 is located in the process step c) of the siliconizing, wherein it rests on the rolling wicks 132 of the basin 131 in order to be immersed in the silicon melt located in the basin 131. On these rolling wicks 132, it has been deposited in a last cycle of movement of the method step c) of the carriage member 220 of the conveyor 200.
• a movement cycle of the conveying part 220 may each include the transport in the conveying direction by the distance of a pair of grooves 210a from the adjacent pair of grooves 210a or by a multiple of this distance.
• the workpieces 1 are slowly cooled as they are progressively removed from the silicator 130.
• FIG. 4 shows an alternative embodiment to that of FIG. 3, wherein the waste heat released in step d) can be used particularly meaningfully.
• the second section of the conveyor 200 is arranged on the same side of the siliconizer 130, but below the first section of the conveyor 200.
• the beams 212 of the support member 210 as well as the beams 222 of the carriage member 220 with their respective grooves 210a, 220a are shown in a state within the closed cycle of movement (closed arrow line) in which the beams 222 are raised from the beams 212 and the workpieces 1 are thus in their movement phase, in which they do not rest on the holding part 210.
• an intermediate step must be set between the method steps c) and d), which consists in that the workpieces 1 currently located in the basin 131 of the silicating device 130 are transported with their rod 10 downwards onto the second section of the conveying device 200. This may be done by the beams 221, 222 of the carriage member 220 itself or by a separate mechanism (such as a pair of auxiliary beams for down travel).

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• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Ceramic Engineering (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Manufacturing & Machinery (AREA)
• Materials Engineering (AREA)
• Structural Engineering (AREA)
• Organic Chemistry (AREA)
• Silicon Compounds (AREA)
• Crystals, And After-Treatments Of Crystals (AREA)

Applications Claiming Priority (2)

Publications (1)

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Family Applications (1)

Country Status (7)

Family Cites Families (13)

• 2010
  • 2010-08-04 DE DE102010038914A patent/DE102010038914A1/de not_active Ceased
• 2011
  • 2011-06-15 EP EP11725443.3A patent/EP2601154A1/de not_active Withdrawn
  • 2011-06-15 JP JP2013522154A patent/JP5730392B2/ja not_active Expired - Fee Related
  • 2011-06-15 CN CN201180038300.3A patent/CN103249694B/zh not_active Expired - Fee Related
  • 2011-06-15 WO PCT/EP2011/059888 patent/WO2012016747A1/de active Application Filing
  • 2011-06-15 KR KR1020137005354A patent/KR101425328B1/ko not_active IP Right Cessation
• 2013
  • 2013-02-04 US US13/758,484 patent/US20130142954A1/en not_active Abandoned

Non-Patent Citations (1)

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