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China, Chinese The Molybdenum/Manganese Metallization Breakthrough on Technology of Ceramic to Metal Brazed Used in Vacuum Electronic Devices1 Industrial Products Supplier Manufacturer Details, price list catalog:
China Industrial Products Supplier Manufacturer List Catalog
Ceramic MaterialMetal CeramicsCeramic-to-Metal Brazed AssemblyCeramic-to-Metal Sealing
Xiamen Innovacera Advanced Materials Co., Ltd.
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Product Description INNOVACERA Alumina Ceramic to Metal Seal Vacuum Feedthrough For High Pressure BrazingThe Molybdenum/Manganese metallization developed the technology on Ceramic-to-metal brazed assembly, it provides high mechanical strength and good electrical insulation. At the very beginning, it's used in vacuum electronic devices, gradually applied to semiconductors, integrated circuits, electric light sources, high-energy physics, aerospace, chemical industry, metallurgy, instrumentation and machinery manufacturing and other industrial fields.So how to choose a material become more and more critical for a good vacuum brazing. Here we're mainly discussing about 3 different types of materials that will be used for ceramic-to-metal. MaterialAlumina/BeO/AlNCoating LayerMo/MnThickness:8-30μmPlated LayerNickel, Copper, Gold, etc. Thickness: 2-9μmTreatmentGlazed, polishingDimensionCustomizedJoining typesCeramic + Mo/Mn Metallized + plating NiCeramic + Mo/Mn Metallized + plating AgCeramic + Mo/Mn Metallized + plating AuCeramic + printing Ag 1. Ceramic* Al2O3 * BeO * BN * AlN2. Metala* Kovar alloy * OFC * Stainless steel * Mild steel3. Solder* Ag * Ag-Cu * Cu * AU-Cu * Au-Ni The Ceramic materials are required to be high-temperature stabilized and good thermal expansion of coefficient, INNOVACERA apply mostly the Al2O3. Since ceramics will not be directly wetted, which impedes the adherence of molten metal layers and adhesives, added that the different coefficients of thermal expansion (CTE) between Ceramic and Metal. Breakthrough on such difficulties is with a soldering or brazing process. Metal layer applied on ceramic components via Mo/Mn metallization and Plating or Active brazing, after that, the ceramic and metal components are joined by the melting and subsequent solidification of a filler metal-Solder, with different solders for different applications in different working temperatures. Alumina Ceramic PropertiesPropertiesUnitsAlumina CeramicPuritywt%95%99%99.8%Volume Densityg/cm33.653.8≥3.89Water Absorption%000Crystal Size(Grain Size)μm4-54-54-5Vickers Hardness, HV1.0Gpa141600≥15Flexural StrengthMpa300310≥300Coefficient of LinearExpansion20-500oC1x10-6 mm/oC6.5-7.56.5-7.56.5~7.520-800oC6.5-8.06.5-8.06.5~8.0Thermal ConductivityW/m·K( 20oC)2025≥20.9Specific Heat CapacityKJ/(kg·K)≥0.8≥0.8≥0.8Dielectric StrengthKV/mm≥1215*106≥12Volume ResistivityΩ·cm 20oC≥1014≥1014≥1014Ω·cm 300oC≥1011≥1011≥1011Ω·cm 500oC≥109≥109≥109Dielectric Constant1MHz99-109-10Tangent of Dielectric Loss1MHz≤4x10-4≤2x10-4≤3x10-4Surface Roughnessμm0.4 After Machine0.1-0.4 After Machine0.1-0.4 After MachineMax Working TemperatureoC160016001650
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