Wear Resistant Alumina Metallized Ceramic Components For Traveling Wave Tubes/Innovacera

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Last update: 2017-12-17 00:45
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Wear Resistant Alumina Metallized Ceramic Components For Traveling Wave Tubes/Innovacera


Keywords: metallized ceramics, metallized ceramic components, metallized insulator tube, metal ceramic bush, metallized insulator ceramic , alumina ceramics, ceramic tube, alumina tube, ceramic insulator tube, ceramic sleeve, ceramic bush


1. Introduction:

The excess voltage is released by the triggered ignition of a gas discharge. Depending on the current and voltage,
this results in a glow, spark or arc discharge. Spark gaps for ignition sets work according to the same principle. These are used in the ignition of gas-discharge lamps such as xenon lights in automobiles.

Ceramic-metal joining technology makes high vacuum-tight ceramic-to-metal joints possible (≤10-8 mbar x l/s) with extremely high bond strengths of more than 200 N/mm² (measured using ASTM test specimens). Even more important than mechanical strength in typical applications are good heat transfer properties, minimum electric resistance and vacuum tightness. The metallic layers make the component suitable for integration by means of both hard and soft soldering.

2. Metallized ceramics applications:

Metallized alumina insulator tube are commonly used in many applications, for example in power electronics components placed under extreme load, electrical drive engineering and electrical engineering as well as in electronic components for computer technology, such as: Feed-through insulators, headers, High-power receptacles, Insulating discs, Insulator rings and cylinders, Precipitator products, Power switches,Traveling wave tubes, Vacuum interrupters, Windows, Power grid tubes, X-ray tubes, Triggered spark gaps, Thyristor housings and diode housings, Current feedthroughs, Diffusion pumps, Transmission tubes, Insulators, Integrated circuits.

Features:

1).Excellent electrical insulation
2).High hardness
3).Relatively low strength and fracture toughness
4).Resistance to wear and corrosive
5).Excellent thermal stability
6).Resistance to high temperatures
7).High electrical resistivity
8).Good chemical stability
9).High corrosion resistance

3. Alumina metallized ceramics Joining types:
Ceramic + Mo/Mn Metallized + plating Ni
Ceramic + Mo/Mn Metallized + plating Ag
Ceramic + Mo/Mn Metallized + plating Au
Ceramic + printing AgWear Resistant Alumina Metallized Ceramic Components For Traveling Wave TubesInnovacera.jpg
4. Properties of Alumina Material:

Item Test Condition Unit&Symbol 95% Al2O3 99% Al2O3 99.7% Al2O3
The main chemical ingredient Al2O3 Al2O3 Al2O3
Bulk Density g/cm3 3.6 3.89 3.96
Maximum Use Temperature 1450°C 1600°C 1650°C
Water absorption % 0 0 0
ROHS Hardness ≥85 ≥89 ≥89
Flexural strength 20° C MPa (psi x 103) 358 (52) 550 550
Compressive Strength 20° C MPa (psi x 103) 2068 (300) 2600(377) 2600(377)
Fracture Toughness K(I c) Mpa m1/2 4 - 5 5.6 6
Coefficient of thermal expansion 25-1000° C 1X 10-6/°C 7.6 7.9 8.2
Coefficient of thermal conductivity 20° C W/m °K 16 30 30.4
Thermal Shock Resistance Tc °C 250 200 200
Dielectricity constant 1MHz.25°C 9 9.7 9.7
Dielectric strength ac-kV/mm (ac V/mil) 8.3 (210) 8.7 (220) 8.7 (220)
Volume Resistivity 100°C ohm-cm > 1013 > 1014 > 1014
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