DE707272C - Highly heat-resistant ceramic protective tube for rod-shaped heating conductors, preferably made of graphite - Google Patents
Highly heat-resistant ceramic protective tube for rod-shaped heating conductors, preferably made of graphiteInfo
- Publication number
- DE707272C DE707272C DES124015D DES0124015D DE707272C DE 707272 C DE707272 C DE 707272C DE S124015 D DES124015 D DE S124015D DE S0124015 D DES0124015 D DE S0124015D DE 707272 C DE707272 C DE 707272C
- Authority
- DE
- Germany
- Prior art keywords
- protective tube
- graphite
- rod
- resistant ceramic
- preferably made
- 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.)
- Expired
Links
- 238000010438 heat treatment Methods 0.000 title claims description 15
- 239000004020 conductor Substances 0.000 title claims description 13
- 230000001681 protective effect Effects 0.000 title claims description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims description 7
- 239000000919 ceramic Substances 0.000 title claims description 7
- 229910002804 graphite Inorganic materials 0.000 title claims description 7
- 239000010439 graphite Substances 0.000 title claims description 7
- 229910052573 porcelain Inorganic materials 0.000 claims description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000004566 building material Substances 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
Classifications
-
- 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
- H05B3/14—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 the material being non-metallic
- H05B3/145—Carbon only, e.g. carbon black, graphite
Landscapes
- Furnace Details (AREA)
- Resistance Heating (AREA)
Description
Hochhitzebeständiges keramisches Schutzrohr für stabförmige, vorzugsweise aus Graphit bestehende Heizleiter Es ist bekannt, Heizkörper für sehr hohe Temperaturen, wie sie insbesondere für elektrische Ofen benötigt werden, dadurch herzustellen, daß man :einen stabförmigen, vorzugsweise ,aus Graphit bestehenden Heizleiter in ein hochhitzebeständiges keramisches Schutzrohr einschließt. Man hat auch vorgeschlagen, zum Verschließen der Rohrenden Metallkappen zu verwenden, die mittels eines Hartlotes auf dein. keramischen Rohrkörper aufgelötet werden.Highly heat-resistant ceramic protection tube for rod-shaped, preferably Heating conductors made of graphite It is known to use heating elements for very high temperatures, as they are required in particular for electric ovens, to be produced by that one: a rod-shaped, preferably made of graphite heating conductor in includes a heat-resistant ceramic protective tube. It has also been suggested to close the pipe ends using metal caps, which are made by means of a hard solder to your. ceramic tube body to be soldered.
Bei stabförmigen Heizkörpern für weniger hohe Temperaturen ist @es fern-er bekannt, den Heizleiter mit einem Schutzrohr, beispielsweise .aus Quarz, zu umgeben. Dieser Baustoff ist jedoch für den Erfindungszweck nicht geeignet, da @er bei sehr hohen Temperaturen weich wird.For rod-shaped radiators for less high temperatures, @es Fern-he known, the heating conductor with a protective tube, for example. Made of quartz, to surround. However, this building material is not suitable for the purpose of the invention because @It softens at very high temperatures.
Es ist ferner bekannt, vorzugsweise weridelförmige metallische Heizleiter in eine hitzebeständige keramische Schutzmasse aus Zement, gesinterten Metalloxyden oder einem tonhaltigen plastischen Stoff einzubetten, um sie dadurch nach Möglichkeit dem Angriff des Luftsauerstoffes zu entziehen. Der so hergestellte Heizkörper wird dann durch Brennen hitzebeständig gemacht. Für sehr hohe Ofentemperaturen (beispielsweise r 5oo bis 'i6oo° C) sind jedoch alle :derartigen Heizkörper ungeeignet, da bei diesen Temperaturen die Schutzmasse auf die Dauer nicht gasdicht bleibt.It is also known, preferably spherical metallic heating conductors in a heat-resistant ceramic protective mass made of cement, sintered metal oxides or embed it in a clay-containing plastic material in order to do so if possible to evade the attack of atmospheric oxygen. The radiator produced in this way is then made heat-resistant by firing. For very high oven temperatures (for example However, all of these types of radiators are unsuitable because they are Temperatures the protective mass does not remain gas-tight in the long term.
Gemäß der Erfindung :erhält man einen dauernd ,gasdichten Abschluß des in dem hochhitzebeständigen keramischen Schutzrohr angeordneten, vorzugsweise aus Graphit bestehenden Heizleiters dadurch, d:aß man das vor dem Aufbringen auf den Heizleiter glatt gebrannte Schutzrohr aus einer dichten Masse von hohem Tonerdegehalt, beispielsweise aus sog. Pyrometerporzellan, ,aufbaut. Wird als Heizleiter ein Graphitstab verwendet, so verbrennt bei Inbetriebnahme des fertigen Heizkörperseine kleine Menge des Graphits unter Aufzehrung des Sauerstoffs der in dem Schutzrohr eingeschlossenen Luft. Es bildet sich dabei gewissermaßen selbsttätig leine Schutzgasatmosphäre für den Heizleiter. Der allseitig gasdichte Abschluß des Heizleiters verhindert :das Entweichen der einmal gebildeten Schutzatmosphäre sowie das Eindringen von Gasen, welche die Zerstörung des Heizleiters herbeiführen könnten.According to the invention: a permanent, gas-tight seal is obtained the one arranged in the highly heat-resistant ceramic protective tube, preferably consisting of graphite heating conductor by eating it before application the heating conductor burned smooth protective tube made of a dense mass of high alumina content, For example, from what is known as pyrometer porcelain. A graphite rod is used as the heating conductor used, a small amount burns when the finished radiator is started up of the graphite with the consumption of the oxygen enclosed in the protective tube Air. A protective gas atmosphere is formed automatically, so to speak the heating conductor. The all-round gas-tight closure of the heating conductor prevents: that Escape of the once formed Protective atmosphere as well as penetration of gases that could destroy the heating element.
Auf die angegebene Weise lassen sich elek@ trische Heizkörper herstellen, welche atio bei hohen Temperaturen, wie sie z. B. ,-igt Porzellanbrennöfen herrschen, den Einflüssen der Ofenatmosphäre widerstehen. So erweisen sich z. B. derartige Heizkörper im Dauerbetriebe noch bei Temperaturen zwischen 1500 und t 6oo C als widerstandsfähig.In the specified way, elec @ tric radiators can be produced, which atio at high temperatures, as z. B., -igt porcelain kilns prevail, withstand the influences of the furnace atmosphere. So turn out z. B. such radiators in continuous operation at temperatures between 1500 and 600 C as resistant.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DES124015D DE707272C (en) | 1936-08-29 | 1936-08-29 | Highly heat-resistant ceramic protective tube for rod-shaped heating conductors, preferably made of graphite |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DES124015D DE707272C (en) | 1936-08-29 | 1936-08-29 | Highly heat-resistant ceramic protective tube for rod-shaped heating conductors, preferably made of graphite |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE707272C true DE707272C (en) | 1941-06-18 |
Family
ID=7536439
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DES124015D Expired DE707272C (en) | 1936-08-29 | 1936-08-29 | Highly heat-resistant ceramic protective tube for rod-shaped heating conductors, preferably made of graphite |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE707272C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0022272A1 (en) * | 1979-07-07 | 1981-01-14 | Biuro Projektow Przemyslu Metali Niezelaznych "Bipromet" | Method of anti-corrosion protection of silicon carbide elements and apparatus for carrying out the method |
-
1936
- 1936-08-29 DE DES124015D patent/DE707272C/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0022272A1 (en) * | 1979-07-07 | 1981-01-14 | Biuro Projektow Przemyslu Metali Niezelaznych "Bipromet" | Method of anti-corrosion protection of silicon carbide elements and apparatus for carrying out the method |
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