DE733625C - Ceramic insulating body for high frequency purposes - Google Patents
Ceramic insulating body for high frequency purposesInfo
- Publication number
- DE733625C DE733625C DEA80210D DEA0080210D DE733625C DE 733625 C DE733625 C DE 733625C DE A80210 D DEA80210 D DE A80210D DE A0080210 D DEA0080210 D DE A0080210D DE 733625 C DE733625 C DE 733625C
- Authority
- DE
- Germany
- Prior art keywords
- high frequency
- insulating body
- ceramic insulating
- frequency purposes
- soapstone
- 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
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
- C04B37/00—Joining burned ceramic articles with other burned ceramic articles or other articles by heating
- C04B37/02—Joining burned ceramic articles with other burned ceramic articles or other articles by heating with metallic articles
- C04B37/023—Joining burned ceramic articles with other burned ceramic articles or other articles by heating with metallic articles characterised by the interlayer used
- C04B37/025—Joining burned ceramic articles with other burned ceramic articles or other articles by heating with metallic articles characterised by the interlayer used consisting of glass or ceramic material
-
- 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
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/08—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on beryllium oxide
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Inorganic Insulating Materials (AREA)
Description
Keramischer Isolierkörper für Hochfrequenzzwecke Zum Anschmelzen von Gläsern, die sich mit Wolfram oder Molybdän verschmelzen lassen, benötigt man keramische Körper, deren Scherben eine Wärmeausdehnungskennziffer von 4o ₧ Io-7 bis 50, ₧ I0- cm,/cm' C beträgt. Die gebräuchlichen Porzellane, die einen solchen Ausdehnungskoeffizienten aufweisen, haben den Nachteil, daß sie infolge ihres hohen Alkaligehales und infolge ihres Rufhaues aus einem Gemisch von glasartigen Bestandteilen mit Kristallen sehr hohe dielektrische Verluste aufweisen und nur eine geringe Temperaturwechselbeständigkeit und geringe mechanische Festigkeit besitzen.Ceramic insulator for high frequency purposes For melting on Glasses that can be fused with tungsten or molybdenum are required to be ceramic Bodies whose fragments have a coefficient of thermal expansion from 4o ₧ Io-7 to 50, ₧ 10- cm, / cm 'C. The common porcelains that have such a Have expansion coefficients have the disadvantage that they are due to their high Alkali content and, due to its reputation, a mixture of vitreous components with crystals have very high dielectric losses and only a low resistance to temperature changes and have poor mechanical strength.
Der bekannte, aus gesintertem, praktisch reinem Berylliumoxyd hergestellte Isolierkörper eignet sich wegen seines Ausdehnungskoeffizienten nicht zum Anschmelzen von Gläsern, die sich mit Wolfram oder Molybdän verschmelzen lassen. Wegen seiner Oberflächenbeschaffenheit ist er auch zum Anschmelzen von anderen Gläsern nicht geeignet. Zu seiner Herstellung ist zudem eine sehr höhe Temperatur, nämlich über I 60o° C, erforderlich. Den Gegenstand der Erfindung bildet ein an dielektrischen Verlusten armer keramischer Isolierkörper für Hochfrequenzzwecke mit einem Scherben, dessen Wärmeausdehnungskennziffer etwa 4o₧ Io-7 bis 5o, ₧ Io-7 cm/cm° C beträgt, zum Aasschmelzen von Gläsern, die sich mit Wolfram oder Molybdän verschmelzen lassen. Er unterscheidet sich von den bekannten Körpern dieser Art dadurch, daß er nur Io, bis 4o%o Berylliumoxyd enthält und im übrigen aus einem Speckstein-Kaolin-Gemisch mit einem Specksteingehalt von 25 bis 4o%o besteht. Der Körper wird durch Vermischen von Io, bis 4o0%o Berylliumoxyd mit einem aus Speckstein und Kaolin bestehenden Gemenge der angegebenen Zusammensetzung und durch nachträgliches Formen und Brennen der Masse gewonnen. Der Scherben der so erhaltenen Körper zeigt kristallinen Aufbau und besitzt aus diesem Grunde, sehr günstige mechanische Eigenschaften . Der dielektrische Verlustwinkel tg ð ist kleiner als Io,₧ Io-1. Die Masse kann nach den üblichen keramischen Verfahren trocken oder naß verformt und ohne Zusatz eines Flußmittels vakuumdicht gebrannt werden. Die Brenntemperatur liegt zwischen I3oo und I4oo° C.The well-known one made from sintered, practically pure beryllium oxide Because of its coefficient of expansion, the insulating body is not suitable for melting of glasses that can be fused with tungsten or molybdenum. Because of his It is also not the surface quality for melting other glasses suitable. In addition, a very high temperature is required for its production, namely above I 60o ° C, required. The subject of the invention is a dielectric Loss of poor ceramic insulators for high frequency purposes with a shard, its coefficient of thermal expansion is around 4o ₧ Io-7 to 5o, ₧ Io-7 cm / cm ° C, for carrion melting of glasses that fuse with tungsten or molybdenum permit. It differs from the known bodies of this kind in that it only contains up to 40% beryllium oxide and the rest of a mixture of soapstone and kaolin with a soapstone content of 25 to 40% o. The body is made by mixing from Io, to 4o0% o beryllium oxide with one made of soapstone and kaolin Mixture of the specified composition and by subsequent shaping and firing won the crowd. The body of the body obtained in this way shows a crystalline structure and for this reason it has very favorable mechanical properties. The dielectric Loss angle tg ð is smaller than Io, ₧ Io-1. The mass can be according to the usual ceramic process dry or wet formed and without the addition of a flux be fired vacuum-tight. The firing temperature is between I3oo and I4oo ° C.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEA80210D DE733625C (en) | 1936-08-13 | 1936-08-13 | Ceramic insulating body for high frequency purposes |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEA80210D DE733625C (en) | 1936-08-13 | 1936-08-13 | Ceramic insulating body for high frequency purposes |
Publications (1)
Publication Number | Publication Date |
---|---|
DE733625C true DE733625C (en) | 1943-03-31 |
Family
ID=6947957
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEA80210D Expired DE733625C (en) | 1936-08-13 | 1936-08-13 | Ceramic insulating body for high frequency purposes |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE733625C (en) |
-
1936
- 1936-08-13 DE DEA80210D patent/DE733625C/en not_active Expired
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