Adherent focal track structures for X-ray target anodes having diffusion barrier film therein and method of preparation thereof

Claim 2

An improved x-ray tube anode comprising: a graphite anode body having a focal track region for impingement by electrons to produce x-rays; a microcracked diffusion barrier layer disposed on said region; and an anode target layer disposed on top of said barrier layer.

Claim 3

The improved x-ray tube anode according to claim 1 wherein said region is substantially free from surface damage caused during shape forming of said anode body.

Claim 4

The improved x-ray tube anode according to claim 1 wherein said diffusion barrier layer comprises closely packed rhenium grains having a diameter of about 8 to about 15 micrometers.

Claim 5

The improved x-ray tube anode according to claim 3 wherein said rhenium grains are about 5 to about 50 micrometers in height.

Claim 6

The improved x-ray tube anode according to claim 1 wherein said anode target layer comprises tungsten or tungsten-rhenium alloy.

Claim 7

An improved x-ray tube comprising: a substantially evacuated and sealed envelope; a cathode structure positioned at a first end within said envelope, said cathode structure comprising a support, an electron emmisive filament and a focussing cup mounted on said support, a pair of filament conductors for supplying heating current to said filament and a ground conductor to electrically ground said structure; an anode comprising a graphite anode body having a focal track region, a microcracked diffusion barrier layer contiguously disposed on said region, an anode target layer disposed on top of said diffusion barrier layer; and rotating means positioned at a second end within said envelope for rotating said anode.

Claim 8

An improved x-ray tube comprising: a substantially evacuated and sealed envelope; a cathode structure positioned at a first end within said envelope, said cathode structure comprising a support, an electron emmisive filament and a focussing cup mounted on said support, a pair of filament conductors for supplying heating current to said filament and a ground conductor to electrically ground said structure; an anode comprising a graphite anode body having a focal track region, a microcracked diffusion barrier layer contiguously disposed on said region, an anode target layer disposed on top of said diffusion barrier layer; and rotating means positioned at a second end within said envelope for rotating said anode.

Claim 9

The improved x-ray tube according to claim 6 wherein said region of said anode body is substantially free of surface damage caused during shape forming of said anode body.