High voltage vacuum tubes

GB2643086APending Publication Date: 2026-02-04MORGAN ADVANCED CERAMICS INC
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Patent Information

Application Number
GB2025019247
Authority / Receiving Office
GB · GB
Patent Type
Applications
Current Assignee / Owner
Priority Date
2023-05-17
Filing Date
2024-05-16
Publication Date
2026-02-04

AI Technical Summary

Technical Problem

High voltage vacuum tubes face challenges with braze joints due to high solidification temperature ranges (STR) in conventional braze alloys, leading to liquation issues and poor joint strength, especially in x-ray tubes where precise positioning and capillary action are critical.

Method used

A braze joint composition with a solidification temperature range of no more than 90°C and a liquidus temperature between 950°C to 1060°C, containing no more than 18.0 wt% precious metals like Au, Pd, and Pt, is used to reduce the risk of liquation and enhance formability for precise positioning and capillary action in high voltage vacuum tubes.

Benefits of technology

The solution provides hermetic, mechanically strong braze joints with low vapor pressure, maintaining dimensional stability under extreme temperatures and preventing liquation, thus improving the reliability and performance of high voltage vacuum tubes.

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Abstract

The present disclosure relates to a high voltage vacuum tube including: a vacuum tube envelope comprising an interior; an anode assembly disposed within the interior of the vacuum tube envelope; and a cathode assembly disposed within interior of the vacuum tube envelope that emits an electrode beam to strike a target surface of the anode assembly and form electromagnetic radiation. The high voltage vacuum tube includes a braze assembly, said braze assembly comprising a first component and a second component joined together by a first braze joint, said first braze joint comprising a composition including no more than 18.0 wt% in total of one of more precious metals selected from Au, Pd and Pt, where at least a portion of the braze joint is exposed to the interior of the vacuum tube envelope.
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