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Metallized Ceramic Insulator
We manufacture custom Metallized Alumina Ceramics for ultra-high vacuum feedthroughs, vacuum isolator flanges, gas discharge tubes, grid tubes, vacuum interrupters, vacuum capacitors, and similar applications where the ceramic-to-metal joint requires ideal hermeticity and excellent bonding strength.
1. In electric vacuum devices, ceramics and metal components must be brazed to achieve special functions such as vacuum sealing, electrical insulation, microwave transmission, and microwave absorption. Given the considerable difference in thermal expansion coefficients between ceramics and metal alloys, a layer of metal needs to be deposited on the surface of the ceramic so that its specific surface has the characteristics of both ceramics and metals, thereby achieving direct brazing together.
2. An inert gas is usually filled in the electric vacuum device to reach a specific vacuum level. If the airtightness of the ceramic and metal welding components is not good enough, the reliability of the entire vacuum device will fail. Therefore, a layer of nickel, silver, and gold is plated on the surface of the metal layer to enhance the welding wettability, which can improve the welding strength and airtightness after brazing.
3. Alumina ceramics have many electrical and physical performance advantages that metal alloys lack, such as good insulation strength, low dielectric loss, high mechanical strength, high-temperature resistance, low thermal expansion coefficient, fast heat dissipation, etc. Alumina Metallized Ceramics are used for sealing, significantly improving vacuum devices' reliability and extending their life.
We specialize in molybdenum (Mo-Mn) and Tungsten (W) thick-film metallization on 94%, 96%, and 99% alumina Ceramic Components. The main metallization methods used are screen printing or vacuum-like sputtering, followed by electroplating or electroless plating to cover the metallized surface with nickel, gold, silver, or tin. This way, the ceramic can be welded with oxygen-free copper, Kovar, stainless steel, and other alloys.
We can customize different types of ceramic metallized components and produce products from small to large sizes. The minimum outer diameter is 2.0mm with a height of 0.80mm, and the maximum outer diameter is 200mm. If you are looking for a better solution for metallized Ceramic Insulators or to develop new products, don't hesitate to contact us today!
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Brand:Jinghui CeramicsMin. Order:Piece/PiecesModel No:CustomizedTransportation:Ocean,Land,Air,Express,ExpressPackaging:Vacumm packaging with export cartonSupply Ability:100,000pcs/monthPlace of Origin:ChinaProductivity:50,000pcs/monthWhy a silver plating cover on metallized ceramic frame? Sometimes, a few customers asked a silver plating is asked to cover on nickle plating of metallized ceramics. The main purpose is to increase the wettability at brazing process. We are able to... -
Brand:Jinghui CeramicsMin. Order:Piece/PiecesModel No:CustomizedTransportation:Ocean,Land,Air,Express,ExpressPackaging:Vacumm packaging with export cartonSupply Ability:100,000pcs/monthPlace of Origin:ChinaProductivity:50,000pcs/monthMetallized Ceramics for High Voltage GDT Alumina ceramic parts always work as ceramic housing, ceramic holder,ceramic insulator and output energe windown in variety of electrical vacuum device, it can offer ideal electrical isolation, great... -
Unit Price:20~100USDBrand:Jinghui CeramicsMin. Order:Piece/PiecesModel No:CustomizedTransportation:Ocean,Land,Air,Express,ExpressPackaging:Vacumm packaging with export cartonSupply Ability:200,000pcs/monthPlace of Origin:ChinaProductivity:50,000pcs/monthCeramic Insulator for Ultra-high Frequency Electron Tubes Jinghui supplies a great many of metallized ceramic insulators, all these metallized ceramics are ideal for use in high vacuum, high current, high voltage and high pressure applications. We... -
Unit Price:USD 17.5 - 30 / Piece/PiecesBrand:Jinghui CeramicsMin. Order:Piece/PiecesModel No:CustomizedTransportation:Ocean,Land,Air,Express,ExpressPackaging:Vacumm packaging with export cartonSupply Ability:200,000pcs/monthPlace of Origin:ChinaProductivity:50,000pcs/monthMetallized Alumina Ceramic Insulator for Electron Tubes Metallized alumina ceramics are widely used in many different industrial applications because its special function in connection of ceramic to metal and ceramic to ceramic, such as in power... -
Brand:Jinghui CeramicsMin. Order:Piece/PiecesModel No:CustomizedTransportation:Ocean,Land,Air,Express,ExpressPackaging:Vacumm packaging with export cartonSupply Ability:200,000pcs/monthPlace of Origin:ChinaProductivity:50,000pcs/monthAlumina Ceramics for RF Power Feedthrough At present, the commonly used advanced ceramics in electric vacuum devices are aluminum oxide,beryllium oxide,boron nitride, aluminum nitride and diamond. Considering the cost performance, aluminum oxide...
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Quality of Metal-Ceramic Insulator Package
Airtightness is one of the important indicators to measure the quality of Metal-Ceramic Insulator Package. Leakage is the main reason for the failure of Metal-Ceramic Insulator Package.
1. Reasons Related to Ceramic Insulators:
a. There may be problems in some links of the ceramic insulator production process, which may cause leakage of the ceramic insulator itself.
b. There may be problems with the metallization treatment of the sealing surface (the contact surface between ceramic and metal parts) of the ceramic insulator before welding, such as the metallization layer falling off and exposing ceramic. In this way, the liquid solder cannot effectively wet the exposed ceramic, and thus cannot fill the gap between the ceramic and the metal parts, causing leakage.
c. The matching size of ceramic insulator and metal parts is too small, so the gap with the metal parts becomes larger, and the solder cannot fill the gap, causing leakage.
2. Reasons Related to the Brazing Process:
a. When the temperature is low or the holding time is short, the solder has not flowed enough, causing leakage.
b. When the temperature is high or the holding time is long, the solder is scattered more, and the remaining solder cannot fill the gap densely, causing leakage.
Measures to Improve Airtightness
1. Strictly follow the relevant requirements during the production and brazing of ceramic insulators to reduce the possibility of leakage caused by improper ceramics and brazing process.
2. Before welding, ceramic insulators with defects such as exposed ceramic on the sealing surface and small size should be picked out as much as possible, so as to improve the brazing yield rate to a certain extent.
1. Reasons Related to Ceramic Insulators:
a. There may be problems in some links of the ceramic insulator production process, which may cause leakage of the ceramic insulator itself.
b. There may be problems with the metallization treatment of the sealing surface (the contact surface between ceramic and metal parts) of the ceramic insulator before welding, such as the metallization layer falling off and exposing ceramic. In this way, the liquid solder cannot effectively wet the exposed ceramic, and thus cannot fill the gap between the ceramic and the metal parts, causing leakage.
c. The matching size of ceramic insulator and metal parts is too small, so the gap with the metal parts becomes larger, and the solder cannot fill the gap, causing leakage.
2. Reasons Related to the Brazing Process:
a. When the temperature is low or the holding time is short, the solder has not flowed enough, causing leakage.
b. When the temperature is high or the holding time is long, the solder is scattered more, and the remaining solder cannot fill the gap densely, causing leakage.
Measures to Improve Airtightness
1. Strictly follow the relevant requirements during the production and brazing of ceramic insulators to reduce the possibility of leakage caused by improper ceramics and brazing process.
2. Before welding, ceramic insulators with defects such as exposed ceramic on the sealing surface and small size should be picked out as much as possible, so as to improve the brazing yield rate to a certain extent.