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Boron nitride clamping for high-power traveling wave tubes
PBN ceramic clamping rod: The core of military high-power traveling wave tubes, replacing imports.
Type
Material
Tags
Other resource gains
Safety engineering technology science
Clamping helix
Thermally conductive
Thermal conductivity
Pyrolytic boron nitride (pbn) ceramics
Clamping rod for traveling wave tube
Solution maturity
Mass promotion / Mass production
Cooperation methods
Joint venture cooperation
Face-to-face consultation
Applicable industry
Scientific research and technology services
Applications
Defense electronics
Key innovations
The innovation of this PBN clamping rod is that it uses pyrolytic boron nitride ceramic. With its comprehensive excellent properties such as low dielectric constant/loss, high thermal conductivity, and thermal shock resistance, it successfully solves the problem of preparing and processing high-power traveling wave tube dielectric materials.
Potential economic benefits
This pyrolytic boron nitride clamping rod technology is leading in China and can replace imports and meet the domestic demand for 100,000 traveling wave tubes for military and civilian use every year. This will significantly reduce procurement costs, ensure the security of the defense industry chain, create huge domestic market value, achieve import substitution and technological autonomy of key components, and bring considerable economic benefits.
Potential climate benefits
Optimize thermal management and dielectric properties of traveling wave tubes, improve energy efficiency, and reduce operating energy consumption. Extend component life and reduce carbon emissions related to manufacturing and import and transportation.
Solution supplier
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Shandong Guojing New Materials Company
Shandong Guojing New Materials Company
Shandong Guojing New Materials Co., Ltd. focuses on the research and development, production and sales of high-purity alumina ceramics, empowering high-end industrial fields such as semiconductors and aerospace.
China
Solution details

Project introduction: The clamping rod is an important structural and functional integrated component in the traveling wave tube. It plays the role of clamping the helix, conducting heat, and providing the "carrier" of the thin film attenuator. As the output power of military traveling wave tubes continues to increase and the microwave frequency band gradually expands, more stringent requirements have been put forward on the comprehensive performance of the dielectric materials used. The preparation and processing of clamping rods to meet the requirements of high-power traveling wave tubes has become one of the difficulties in military microwave technology. Pyrolytic boron nitride (PBN) ceramics have become the best material for holding rods for high-power traveling wave tubes due to their low dielectric constant and dielectric loss, high thermal conductivity, good thermal shock resistance and machinability.

Main features:


(1)Relative density:2.1~2.2g/cm3 (2) Tensile strength:≥ 40MPa

(3)Flexural strength: ≥80Mpa

(4)Thermal conductivity (25℃ ): vertical deposition direction ≥60W/m℃, parallel deposition direction ≥2W/m℃

(5)Resistivity (25℃):≥ 1× 1015Ω·cm; (6) Dielectric strength:≥ DC2×105V/mm;

(7)Dielectric constant: 5.2±0.2 in vertical deposition direction, 3.4±0.2 in parallel deposition direction; (8) Dielectric loss:≤1×10 − 4@X band, ≤3×10-4@Ku band

Technical level: leading in China

Application prospects: As the most important high-power microwave amplification device at present, traveling wave tubes are key components of electronic equipment such as radar, electronic countermeasures, relay communications, satellite communications, TV live broadcast satellites, navigation, remote sensing, remote control and telemetry. It plays an important role and has broad application prospects in the fields of national defense equipment such as millimeter wave radar, satellites, airborne communications and electronic countermeasures. Domestic boron nitride clamping rods currently rely mainly on imports, with an annual demand of about 100,000.


Last updated
09:34:30, Nov 05, 2025
Information contributed by
Green Technology Bank

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