Premium
EXTRUSION OF REFRACTORY OXIDE INSULATORS FOR VACWM TUBES 1
Author(s) -
Navias Lurs
Publication year - 1932
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1932.tb13927.x
Subject(s) - extrusion , materials science , talc , composite material , oxide , refractory (planetary science) , electrolyte , metallurgy , chemistry , electrode
A method is described whereby nonplastic materials such as refractory oxides are given a temporary plasticity, sufficient for extrusion. The organic plastic gel used consists of flour or starch paste with ammonia as an electrolyte. A short detailed account is given of the manufacture of twin‐hole insulators made of MgO 98% and talc 2% for radio 227 vacuum tubes, with supplemental experimental results on other materials. The refractory oxides Al 2 O 3 , BeO, ZrO 2 , MgO, and ThO 2 are compared from the standpoint of their physical properties and their ability to act as insulators in contact with hot tungsten filaments. Examples are given of the use of such extruded oxide insulators for hot filament supports.