Patent ID: 6139768
Filing Date: 2000-10-31
Classification: H01J

Abstract:
A nitrogenated evaporable getter material with high fritting resistance for use in an evaporable getter device, comprising:a BaAl.sub.4 powder in which the particle size is smaller than 250 .mu.m;a nickel powder, having at least 80% by weight particles ranging in size from 10 to 60 .mu.m, with most of the rest of the particles having a particle size smaller than 10 .mu.m; anda third powder having particles with a size smaller than 125 .mu.m comprising grains of a nitrogenated compound selected from the group consisting of iron nitride (Fe.sub.4 N), germanium nitride (Ge.sub.3 N.sub.4) or mixed nitrides of iron and germanium, the particles being coated by a thin vitreous layer of boron oxide (B.sub.2 O.sub.3) and silicon oxide (SiO.sub.2), formed through a sol-gel process employing a starting solution wherein the atomic ratio between boron and silicon ranges from about 4:1 to 0.75:1.