High-voltage vacuum tubes

A brazing alloy with a narrow STR and limited noble metals addresses the elution and strength issues in high-voltage vacuum tubes, ensuring robust and airtight seals for improved vacuum tube performance.

JP2026520392APending Publication Date: 2026-06-23MORGAN ADVANCED CERAMICS INC
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
MORGAN ADVANCED CERAMICS INC
Filing Date
2024-05-16
Publication Date
2026-06-23

AI Technical Summary

Technical Problem

High-voltage vacuum tubes face issues with conventional brazing alloys having wide solidification temperature ranges (STR) leading to elution and insufficient joint strength, especially in complex joints and high-temperature environments, which affect the integrity and reliability of vacuum tubes like X-ray tubes.

Method used

A brazing alloy composition with a solidification temperature range of 90°C or less and a liquidus temperature between 950°C to 1060°C, containing noble metals like Au, Pd, and Pt in limited amounts, is used to form brazed joints in vacuum tubes, ensuring low elution risk and sufficient formability for precise positioning and sealing.

Benefits of technology

The new brazing alloy composition provides strong, reliable, and airtight seals in vacuum tubes, maintaining structural integrity under high temperatures and preventing elution, thus enhancing the operational performance and longevity of high-voltage vacuum tubes.

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Abstract

This disclosure relates to a high-voltage vacuum tube comprising a vacuum tube envelope including an interior, an anode assembly disposed within the interior of the vacuum tube envelope, and a cathode assembly disposed within the vacuum tube envelope, which emits an electrode beam to strike a target surface of the anode assembly and form electromagnetic radiation. The high-voltage vacuum tube comprises a brazed assembly, which comprises a first component and a second component joined together by a first brazed joint, the first brazed joint comprising a composition containing one or more noble metals selected from Au, Pd and Pt in total weight of 18.0% or less, and at least a portion of the brazed joint is exposed within the vacuum tube envelope.
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