INNOVACERA | technical ceramic solutions

When engineers evaluate an AlN vs. alumina laser ceramic submount for diode packaging, AlN’s much higher thermal conductivity makes it seem like the obvious choice. In many high-power packages, that is true. But it is not the whole trueth.   The real question is how much of the temperature rise from the laser junction to the package base occurs across the ceramic. For a high-power CW laser in a compact package, AlN often justifies its higher cost. For a moderate-power device with an efficient package base and enough thermal margin, alumina may work equally well in practice.   At INNOVACERA, we prefer to look at the complete package before recommending either material.   Why the Submount Matters   Heat generated at the laser junction follows a short but complex path:   Laser junction → laser die → die attach → ceramic submount → TEC or package base → heat sink   The submount sits directly below the laser die, so it has to do several jobs at once. It support...

  In systems such as vacuum coating, semiconductor equipment, vacuum furnaces, and scientific research instruments, vacuum gauges are used to monitor the pressure status inside the equipment. For some cold cathode vacuum gauges, the anode assembly is one of the important functional components inside, and its structural accuracy, insulation performance, and the connection quality between components will all affect the stability of the component’s operation.   Unlike ordinary metal electrodes, the anode assemblies of vacuum gauges usually need to simultaneously meet requirements such as high-voltage conductivity, electrical insulation, precise positioning, adaptation to the vacuum environment, and reliable connection. Therefore, the combination of alumina ceramics and metal components has become a common structural solution for such components.   The vacuum gauge anode assemblies currently provided by INNOVACERA adopt an alumina ceramic insulation structure, combined with a...

Ceramic to metal brazed assemblies combine electrical insulation with metal conductors,housings and mounting interfaces.They are used in vacuum feedthrough,hermetic connectors and electronic packages where power or signals must pass through a sealed boundary.   INNOVACERA supplies custom ceramic to metal components and HTCC ceramic package housings,with support for material selection,metallization, plating, brazing and inspection.     Ceramic to Metal Brazed Assemblies   A Ceramic-to-metal assembly joins an insulating ceramic body to metal parts such as pins,tubes,frames or flanges.The ceramic provides electrical isolation,while the metal provides conductive paths and mechanical connections.   Typical component configurations include:   Ceramic-to-metal vacuum feedthroughs for power and signal transmission.   Multipin hermetic connectors for instrumentation and sensor interfaces.   Metallized ceramic rings, tubes and bushings brazed to metal hard...

In continuous casting, the refractory component is part of the flow-control system. Innovacera’s Zirconia refractories are used in these critical areas because of their resistance to corrosion, erosion and thermal degradation, such as slide gate plates, submerged entry nozzles, ladle shrouds, nozzles, and tundish linings, among the steelmaking applications for its stabilized zirconia materials.   And three of the main problems encountered by steelmaking refractories are thermal shock and fatigue, slag and metal corrosion, and erosion and clogging. These mechanisms often occur together rather than separately. For nozzles, erosion can gradually enlarge or change the shape of the bore. Either situation can affect the stability of the casting process.   The Tundish metering nozzles control the amount of molten steel entering the mold, maintain steel purity and prevent oxidation during transfer between ladle and tundish. But the nozzle has to maintain a stable bore while exposed to...