CONTROL OF METALIZATION OF CORUNDUM CERAMICS 

Deryabin Denis Viktorovich, director for manufacturing, head of scientific and manufacturing complex in the direction of vacuum capacitors and switching devices, Scientific Research Institute of Electronic and Mechanical Devices (440060, 44 Karakozova street, Penza, Russia), iko-intruder@rambler.ru
Alimova Elena Aleksandrovna,  engineer-metrologist, Scientific Research Institute of Electronic and Mechanical Devices (440060, 44 Karakozova street, Penza, Russia), alimova_ae@mail.ru
Smirnov Gennadiy Alekseevich, candidate of technical sciences, leading engineer-technologist, Scientific Research Institute of Electronic and Mechanical Devices (440060, 44 Karakozova street, Penza, Russia), sga20@kbtech.ru
Shulgin Aleksandr Vladimirovich, lead design engineer, Scientific Research Institute of Electronic and Mechanical Devices (440060, 44 Karakozova street, Penza, Russia), hron85@rambler.ru
Ol'khovoy Aleksey Aleksandrovich, head of technological bureau, Scientific Research Institute of Electronic and Mechanical Devices (440060, 44 Karakozova street, Penza, Russia), aleksey.ol.@mail.ru

620.179.119

10.21685/ 2307-4205-2018-2-7

In the manufacture of vacuum electronic components, the products from corundum ceramics with metallized surfaces have been widely used as the main element of the vacuum block and / or insulator, welded to metal fittings. The seals of ceramic products and metal fittings are subject to strict standards for strength and vacuum tightness. The quality of the soldered seam of a ceramic product with metal fittings depends on many factors: the design of the seam, the quality of the metal fittings, the quality of the metallization of the ceramic products, and the quality of the corundum ceramics itself. This article examines the reasons for the low strength and the loss of tightness of the soldered seams of corundum ceramics with metal fittings caused by a poor-quality layer of metallization on the surface of the ceramic. Studies have been carried out on the effect of the oxygen concentration in the metallization layer on the tearing force and the vacuum tightness after soldering. The chemical composition of the nickel layer surface, applied on the metallization surface, is defined, depending on its thickness and the influence of the thickness of the nickel coating on the quality of the soldered seams. The reasons for the unsatisfactory application of galvanic nickel are found out.

ceramics, vacuum density, metallization, electron scanning micro-scope, chemical analysis, fractographic analysis