EP3874219A1 - Heizelement für einen dental-keramik brennofen sowie dental-sinter brennofen - Google Patents
Heizelement für einen dental-keramik brennofen sowie dental-sinter brennofenInfo
- Publication number
- EP3874219A1 EP3874219A1 EP19786797.1A EP19786797A EP3874219A1 EP 3874219 A1 EP3874219 A1 EP 3874219A1 EP 19786797 A EP19786797 A EP 19786797A EP 3874219 A1 EP3874219 A1 EP 3874219A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- heating
- heating element
- dental
- closure
- combustion chamber
- 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.)
- Pending
Links
- 238000010438 heat treatment Methods 0.000 title claims abstract description 89
- 238000005245 sintering Methods 0.000 title description 10
- 239000011351 dental ceramic Substances 0.000 title description 6
- 239000011521 glass Substances 0.000 claims abstract description 27
- 229910010293 ceramic material Inorganic materials 0.000 claims abstract description 12
- 230000007704 transition Effects 0.000 claims abstract description 10
- 229910052574 oxide ceramic Inorganic materials 0.000 claims abstract description 7
- 239000011224 oxide ceramic Substances 0.000 claims abstract description 7
- 238000002485 combustion reaction Methods 0.000 claims description 34
- 239000000463 material Substances 0.000 claims description 16
- 238000010304 firing Methods 0.000 claims description 14
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 7
- 238000007789 sealing Methods 0.000 claims description 7
- 230000001681 protective effect Effects 0.000 claims description 6
- 239000005388 borosilicate glass Substances 0.000 claims description 5
- 238000002844 melting Methods 0.000 claims description 5
- 230000008018 melting Effects 0.000 claims description 4
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 229910001092 metal group alloy Inorganic materials 0.000 claims description 2
- 150000002739 metals Chemical class 0.000 claims description 2
- 229910052750 molybdenum Inorganic materials 0.000 claims description 2
- 239000011733 molybdenum Substances 0.000 claims description 2
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 2
- 229910052721 tungsten Inorganic materials 0.000 claims description 2
- 239000010937 tungsten Substances 0.000 claims description 2
- 229910000679 solder Inorganic materials 0.000 abstract description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 6
- 239000007789 gas Substances 0.000 description 5
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 5
- 238000011109 contamination Methods 0.000 description 4
- 230000006698 induction Effects 0.000 description 4
- 229910052786 argon Inorganic materials 0.000 description 3
- YXTPWUNVHCYOSP-UHFFFAOYSA-N bis($l^{2}-silanylidene)molybdenum Chemical compound [Si]=[Mo]=[Si] YXTPWUNVHCYOSP-UHFFFAOYSA-N 0.000 description 3
- 230000006378 damage Effects 0.000 description 3
- 229910052743 krypton Inorganic materials 0.000 description 3
- DNNSSWSSYDEUBZ-UHFFFAOYSA-N krypton atom Chemical compound [Kr] DNNSSWSSYDEUBZ-UHFFFAOYSA-N 0.000 description 3
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 3
- SIWVEOZUMHYXCS-UHFFFAOYSA-N oxo(oxoyttriooxy)yttrium Chemical compound O=[Y]O[Y]=O SIWVEOZUMHYXCS-UHFFFAOYSA-N 0.000 description 3
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 3
- 229910010271 silicon carbide Inorganic materials 0.000 description 3
- 229910001928 zirconium oxide Inorganic materials 0.000 description 3
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N ZrO2 Inorganic materials O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 239000003564 dental alloy Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 239000011261 inert gas Substances 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910021343 molybdenum disilicide Inorganic materials 0.000 description 2
- 229910052754 neon Inorganic materials 0.000 description 2
- GKAOGPIIYCISHV-UHFFFAOYSA-N neon atom Chemical compound [Ne] GKAOGPIIYCISHV-UHFFFAOYSA-N 0.000 description 2
- 229910000505 Al2TiO5 Inorganic materials 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 1
- 229910002113 barium titanate Inorganic materials 0.000 description 1
- JRPBQTZRNDNNOP-UHFFFAOYSA-N barium titanate Chemical compound [Ba+2].[Ba+2].[O-][Ti]([O-])([O-])[O-] JRPBQTZRNDNNOP-UHFFFAOYSA-N 0.000 description 1
- 238000002845 discoloration Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 229910000953 kanthal Inorganic materials 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 229910021344 molybdenum silicide Inorganic materials 0.000 description 1
- JKQOBWVOAYFWKG-UHFFFAOYSA-N molybdenum trioxide Chemical compound O=[Mo](=O)=O JKQOBWVOAYFWKG-UHFFFAOYSA-N 0.000 description 1
- 229910052756 noble gas Inorganic materials 0.000 description 1
- 150000002835 noble gases Chemical class 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- AABBHSMFGKYLKE-SNAWJCMRSA-N propan-2-yl (e)-but-2-enoate Chemical compound C\C=C\C(=O)OC(C)C AABBHSMFGKYLKE-SNAWJCMRSA-N 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 238000011282 treatment Methods 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
- 229910052845 zircon Inorganic materials 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C13/00—Dental prostheses; Making same
- A61C13/20—Methods or devices for soldering, casting, moulding or melting
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D99/00—Subject matter not provided for in other groups of this subclass
- F27D99/0001—Heating elements or systems
- F27D99/0006—Electric heating elements or system
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B17/00—Furnaces of a kind not covered by any preceding group
- F27B17/02—Furnaces of a kind not covered by any preceding group specially designed for laboratory use
- F27B17/025—Furnaces of a kind not covered by any preceding group specially designed for laboratory use for dental workpieces
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D11/00—Arrangement of elements for electric heating in or on furnaces
- F27D11/02—Ohmic resistance heating
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/02—Details
- H05B3/06—Heater elements structurally combined with coupling elements or holders
- H05B3/08—Heater elements structurally combined with coupling elements or holders having electric connections specially adapted for high temperatures
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/10—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor
- H05B3/12—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/40—Heating elements having the shape of rods or tubes
- H05B3/42—Heating elements having the shape of rods or tubes non-flexible
- H05B3/44—Heating elements having the shape of rods or tubes non-flexible heating conductor arranged within rods or tubes of insulating material
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/62—Heating elements specially adapted for furnaces
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D99/00—Subject matter not provided for in other groups of this subclass
- F27D99/0001—Heating elements or systems
- F27D99/0006—Electric heating elements or system
- F27D2099/0008—Resistor heating
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D99/00—Subject matter not provided for in other groups of this subclass
- F27D99/0001—Heating elements or systems
- F27D99/0006—Electric heating elements or system
- F27D2099/0008—Resistor heating
- F27D2099/0011—The resistor heats a radiant tube or surface
Definitions
- the invention relates to a heating element for a dental ceramic furnace and a dental sintering furnace with a heating element according to the invention.
- Dental sintering furnaces with different heating elements are known for sintering metal-free dental prostheses, such as zirconium oxide, and for firing dental ceramic materials onto dental alloys, in particular of zirconium and / or other ceramic materials.
- Resistance heaters are known for ovens which are used for sintering veneering ceramics and for fires for fixing paint or gloss treatments, in which a heating wire - preferably made of Kanthal - is used as a heating element in a quartz glass envelope. Due to the material, these heating elements are up to max. Approx. 1200 ° C can be used, which is sufficient for sintering veneering ceramics and carrying out painting / fixing fires.
- Dental restorations have increasingly been produced from S1O2 for several years. Typically, this material is processed in a pre-sintered state and then finally sintered in a sintering furnace. Temperatures of 1200 ° C are not sufficient for this, rather temperatures up to approx. 1650 ° C are required.
- heating elements made of molybdenum disilicide, for example are known. This is a dense metal-ceramic material that consists of molybdenum silicide and an oxide component, predominantly a glass phase. This portion of glass or a protective layer changes during the heating phase. This can lead to flaking and thus contamination in the combustion chamber and also lead to contamination of the object to be sintered. The flaking leads as small pieces of glass and glass dust to contamination of the combustion chamber and / or the object to be sintered.
- the object of the invention is to provide a heating element for a dental furnace with improved possible uses. It is also an object of the invention to create a dental furnace with such a heating element.
- the object is achieved according to the invention by a heating element with the features of claim 1 and by a dental furnace with the features of claim 11.
- the heating element according to the invention for a dental furnace has a tube element for receiving a heating coil within the tube element.
- the tubular element is closed at least on one side by a closure element.
- the closure element closes an open end of the tubular element.
- the second end of the tubular element can be closed or closed by a further closure element.
- the at least one closure element serves to lead through electrical connection elements for the heating coil.
- the electrical connection elements can either be passed through both closure elements or only through one of the two closure elements.
- the tubular element is preferably made of a ceramic material. Oxide ceramics are particularly suitable as the material.
- Oxide ceramics which have high heat resistance, preferably above 1,700 ° C., in particular above 1,800 ° C., are advantageously used.
- ceramic materials can be used which achieve a high vacuum tightness or low leakage rate of in particular less than 10 8 mbar * l / s under the conditions of use according to the invention (according to the Helios leak test).
- the ceramic material particularly preferably comprises or consists of oxide ceramics selected from the group consisting of aluminum oxide, titanium oxide, zirconium oxide, magnesium oxide, zinc oxide, aluminum titanate, barium titanate and yttrium oxide and mixtures thereof.
- oxide ceramics with a high degree of purity have proven to be advantageous.
- the proportion of oxide ceramic in the tubular element is above 90% by weight, preferably above 95% by weight, in particular above 97% by weight and in particular above 99% by weight. -%, or above 99.5 wt .-%, each based on the total weight of the tubular element material.
- Aluminum oxide or zirconium dioxide or yttrium oxide is particularly preferred, in each case with a degree of purity above 95% by weight, preferably above 97% by weight, in particular above 98% by weight or 99% by weight and in particular above of 99.5% by weight.
- a tubular element made of the material described above has the particular advantage that for firing dental ceramic materials good results can be achieved on dental alloys such as zircon and / or other ceramic materials at temperatures up to 1100 ° C. This also applies to the sintering of metal-free dentures, such as zirconium oxide or similar material, especially up to 1600 ° C.
- flaking off of material parts such as, for example, glass splinters / glass dust, such as when using molybdenum disilicide, is avoided.
- the tubular element made of the material described above is also significantly less sensitive to forces and moments, so that in particular the passage of a heating element according to the invention through a through opening of a housing of a combustion chamber and a fixing in this through opening is possible well and reliably .
- the at least one closure element which is preferably used to receive the electrical connections and lead out the electrical connections, is preferably made of quartz glass and / or borosilicate glass.
- the at least one closure element is preferably connected to the tubular element by means of glasses and / or glass solder.
- the thermal expansion coefficients of the materials used, in particular of the tubular element and the at least one closure element are similar, preferably essentially identical.
- the coefficient of thermal expansion of the tubular element is in the range of
- the heating element In order to avoid stress cracks and thus leaks in the heating element, it is preferable to provide at least one intermediate element between the tubular element and the closure element.
- the at least one intermediate element has a coefficient of thermal expansion that lies between the coefficients of thermal expansion of the tubular element and the closure element. It is particularly preferred that a plurality of intermediate elements are provided, each having different coefficients of thermal expansion, so that the coefficient of thermal expansion is adjusted in stages. It is preferred here that intermediate glasses or transition glasses are used as intermediate elements in order to compensate or adapt the different coefficients of thermal expansion.
- intermediate elements made of quartz glass for the electrical connections, preferably 10-15 intermediate glasses and when using borosilicate glass 3-10 intermediate glasses for the tubular element made of aluminum oxide or zirconium dioxide or yttrium oxide are necessary and fused together.
- the tubular element is fused together via the at least one intermediate element, in particular the plurality of intermediate glasses, in such a way that a vacuum density or leakage rate of in particular less than 10 8 mbar * l / s in this area at temperatures of up to 500 ° C. is ensured.
- Another possibility is to cool the heating element strongly in the area of the transition between the tube element and the closure elements and / or to provide a long transition so that the occurrence of stresses is avoided or the risk of crack formation is greatly reduced.
- the heating coil arranged inside the tubular element is a heating coil made of tungsten and / or molybdenum.
- the heating coil has high-melting metals or metal alloys as the material.
- the melting temperatures of the materials used are advantageously above 2,000 ° C., preferably above 2,500 ° C., in particular above 2,600 ° C. In one embodiment, the melting temperatures of the heating coil are in particular at least 2,600 ° C or at least 3,400 ° C.
- the tubular element in which the heating coil is arranged is preferably filled with a protective gas.
- a protective gas selected from the group consisting of argon, neon and krypton and any mixtures thereof have proven to be protective gas or inert gas.
- the pipe element is preferably gas-tight, so that the protective gas cannot escape into the combustion chamber. Appropriate gas-tightness is also provided if there is a reduced pressure in the combustion chamber of the dental furnace compared to atmospheric pressure. For this purpose, pressures in the range from 20 mbar to 1 bar, in particular in the range from 30 mbar to 950 mbar, can be used.
- the invention further relates to a dental firing furnace with a heating element, which is preferably designed as described above.
- the dental furnace has a housing that forms a combustion chamber.
- the dental element to be fired or sintered is arranged in the combustion chamber. This is usually done on a burning table, with a relative movement typically taking place between the burning table and the combustion chamber in order to introduce the objects to be burned into the combustion chamber and to close the combustion chamber close.
- At least one heating element is arranged within the combustion chamber.
- the housing of the dental firing furnace has at least one through opening, a heating element being passed through a respective through opening or inserted into the combustion chamber.
- the heating element according to the invention is arranged in such a way that the closure element is arranged outside the combustion chamber and in particular also outside the housing. The closure element is therefore not exposed to the high temperatures prevailing in the combustion chamber.
- the at least one through opening is preferably closed with a sealing element.
- the sealing element also serves to generate a vacuum that may exist within the combustion chamber.
- the sealing element can also hold or fix the heating element.
- the sealing element is preferably annular and surrounds the heating element.
- the heating element is held in particular in an area of the tubular element, so that the closure element, i.e. preferably the glass elements are arranged completely outside the housing of the combustion chamber.
- a receiving element for the heating element is arranged opposite each passage opening.
- This receiving element which can be a non-continuous opening in the housing, takes up the in particular free end of the heating element, ie the end of the heating element on which no closure element is provided. If the heating element is connected to a closure element on both sides, it is preferred in an alternative embodiment that a further passage opening is arranged opposite each passage opening, so that the second closure element protrudes again from the housing of the combustion chamber on the opposite side .
- Figure 1 is a greatly simplified schematic perspective view of the essential components of a combustion chamber of a dental furnace and
- Figure 2 is a schematic sectional view of an inventive
- a dental firing furnace has a housing 10 which, in the exemplary embodiment shown, has an essentially circular-cylindrical cross section and forms a combustion chamber 12 in the interior.
- the inside of the housing 10 is provided with high-temperature insulation 14.
- a firing table 16 With the aid of a firing table 16, it is possible to introduce dental elements to be fired or sintered, which are arranged on an upper side 18 of the firing table 16, into the combustion chamber 12.
- the combustion chamber 12 is closed on its upper side with a cover, not shown. Vacuum connections for generating a vacuum in the combustion chamber can also be connected via this, for example.
- two heating elements are arranged in the combustion chamber 12, the heating elements being shown in FIG. 1 before assembly.
- the two heating elements 20 are each inserted into the combustion chamber through a through opening 22 which is provided in the housing 10.
- receiving elements 24 opposite the through openings 22 are provided, which in the exemplary embodiment shown are non-through openings into which the free ends of the heating elements 20 are inserted.
- the heating elements are fixed te 20 in the plugged-in state with the aid of sealing elements 26. In the exemplary embodiment shown, these surround the heating elements in a ring and can be fixed, for example, to the connections of the through openings 22 in the thread provided.
- the sealing elements 26 surround the tubular element 30 in front of the area of closure elements 40.
- the heating elements are preferably attached or sealed exclusively in the region of the tubular element 30.
- a connection by means of intermediate elements which are in particular a plurality of intermediate glasses / transition glasses / glass solder 40 or another connecting material, is preferably provided in order to connect the closure elements 28 to the tubular elements 30.
- the individual intermediate elements have a different coefficient of thermal expansion, so that the coefficient of thermal expansion is gradually or stepwise adjusted to the coefficient of thermal expansion of the closure element 28, starting from the coefficient of thermal expansion of the tubular element 30.
- the design of the heating elements 20 is shown in particular in FIG. 2.
- the illustrated embodiment of the heating elements 20 has a tubular element 30.
- the tubular element 30 is closed at the free end 32.
- the free end 32 is inserted into the recesses 24 in this embodiment.
- a heating coil 34 is arranged within the hollow tubular element 30.
- the two electrical connections 36/38 of the heating coil are passed through the at least one intermediate element 40 and through the closure element 28 and fused.
- the closure element 28 is fused to the tubular element 30, for example via a glass solder adapted to the corresponding thermal expansion coefficient and a plurality of intermediate glasses / transition glasses which likewise have the correspondingly adapted thermal expansion coefficients.
- a protective gas argon, neon, krypton is provided in the cavity 42 of the tubular element 30 which receives the heating coil 34.
- the heating coil can also be designed such that the connecting element 36/38 is led out on the left-hand side of the tubular element 30 in FIG.
- a second closure element would then be arranged on the right-hand side, which is designed in accordance with the closure element 28/40 and also with an adapted glass solder and a plurality of intermediate glasses / transition glasses for adapting the different coefficients of thermal expansion with the tube element 30 connected is.
- These adapted thermal expansion coefficients ensure that the pipe element filled with a protective gas / inert gas, argon / krypton, ensures a leakage rate of less than 10 8 mbar * l / s.
Landscapes
- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Mechanical Engineering (AREA)
- Dentistry (AREA)
- Clinical Laboratory Science (AREA)
- Epidemiology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Resistance Heating (AREA)
- Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP18203114 | 2018-10-29 | ||
PCT/EP2019/078192 WO2020088943A1 (de) | 2018-10-29 | 2019-10-17 | Heizelement für einen dental-keramik brennofen sowie dental-sinter brennofen |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3874219A1 true EP3874219A1 (de) | 2021-09-08 |
Family
ID=64082952
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19786797.1A Pending EP3874219A1 (de) | 2018-10-29 | 2019-10-17 | Heizelement für einen dental-keramik brennofen sowie dental-sinter brennofen |
Country Status (7)
Country | Link |
---|---|
US (1) | US11589966B2 (de) |
EP (1) | EP3874219A1 (de) |
JP (1) | JP7442519B2 (de) |
CN (1) | CN113039402A (de) |
AU (1) | AU2019371428A1 (de) |
CA (1) | CA3113313A1 (de) |
WO (1) | WO2020088943A1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102023111636A1 (de) | 2022-05-04 | 2023-11-09 | Vita Zahnfabrik H. Rauter Gmbh & Co. Kg | Heizelement für einen Ofen zum Brennen und/oder Sintern von Werkstücken und Ofen mit mindestens einem derartigen Heizelement |
Family Cites Families (25)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE625847C (de) | 1932-11-26 | 1936-02-17 | Siemens & Halske Akt Ges | Elektrischer Heizwiderstand fuer hohe Temperaturen |
DE1010207B (de) | 1954-03-05 | 1957-06-13 | Wolfgang Laermann | Heizelement fuer indirekte Widerstandsheizung |
US3375319A (en) * | 1965-11-22 | 1968-03-26 | Btu Engineering Inc | High temperature electrical heating unit |
JPS5095649U (de) * | 1973-12-28 | 1975-08-11 | ||
US4272670A (en) * | 1976-05-01 | 1981-06-09 | Docx Albert G | Furnace muffles and furnaces |
US4119832A (en) | 1976-12-17 | 1978-10-10 | Gte Sylvania Incorporated | Hermetically sealed electrical gas fuel igniter |
JPH0561992U (ja) * | 1991-11-27 | 1993-08-13 | セントラル硝子株式会社 | 電熱ヒーター |
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-
2019
- 2019-08-22 US US16/548,069 patent/US11589966B2/en active Active
- 2019-10-17 JP JP2021522020A patent/JP7442519B2/ja active Active
- 2019-10-17 CN CN201980070620.3A patent/CN113039402A/zh active Pending
- 2019-10-17 CA CA3113313A patent/CA3113313A1/en active Pending
- 2019-10-17 AU AU2019371428A patent/AU2019371428A1/en active Pending
- 2019-10-17 WO PCT/EP2019/078192 patent/WO2020088943A1/de active Application Filing
- 2019-10-17 EP EP19786797.1A patent/EP3874219A1/de active Pending
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Publication number | Publication date |
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JP7442519B2 (ja) | 2024-03-04 |
WO2020088943A1 (de) | 2020-05-07 |
US11589966B2 (en) | 2023-02-28 |
US20200129276A1 (en) | 2020-04-30 |
JP2022505616A (ja) | 2022-01-14 |
CN113039402A (zh) | 2021-06-25 |
CA3113313A1 (en) | 2020-05-07 |
AU2019371428A1 (en) | 2021-04-15 |
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