Thermal emissive coating for x-ray targets
AssigneeGeneral Electric Company
InventorMichael J. Randzaao
Life of this patent
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Abstract
A high thermal emittance coating for an x-ray tube anode target which permits broad application parameters and a stable and smooth coating. The coating is composed of ZrO.sub.2 present in an amount of 8% to 20% by weight and Al.sub.2 O.sub.3 and TiO.sub.2 present in an amount of 92% to 80% by weight with the Al.sub.2 O.sub.3 and TiO.sub.2 being present in a ratio in the range of 4 to 1. A preferable coating is composed of about 10% by weight of ZrO.sub.2 and 90% by weight of Al.sub.2 O.sub.3 and TiO.sub.2.
Claims14
An x-ray tube anode comprised of a body having a surface region for being impinged by electrons to produce x-radiation and a coating distinct from said region for enhancing the thermal emittance of said body, said coating composed of a metal oxide coating comprising:
- ZrO.sub.2 present in an amount of about 8% to 20% by weight and Al.sub.2 O.sub.3 together with TiO.sub.2 present in an amount of about 92% to 80% by weight with the Al.sub.2 O.sub.3 being present with respect to the TiO.sub.2 in a ratio in the range of about 4 to 1.
A coating material for an x-ray tube anode comprised of a body having a surface region for being impinged by electrons to produce x-radiation, the coating adapted to be applied distinct from said region for enhancing the thermal emittance of said body comprising:
- a coating composed of a metal oxide mixture comprising ZrO.sub.2 present in an amount of about 8% to 20% by weight and Al.sub.2 O.sub.3 together with TiO.sub.2 present in an amount of about 92% to 80% by weight with the Al.sub.2 O.sub.3 being present with respect to the TiO.sub.2 in a ratio in the range of at least 4:1.
A method of producing a high thermal emittance coating on an x-ray tube anode including the steps of:
- depositing on selected surface regions of said anode a particle coating mixture of metal oxides comprising ZrO.sub.2 present in an amount of 8% to 20% by weight and Al.sub.2 O.sub.3 together with TiO.sub.2 present in an amount of 92% to 80% by weight with the Al.sub.2 O.sub.3 being present with respect to the TiO.sub.2 in a ratio in the range of about 4:1;
- and
- heating said anode under vacuum conditions and at a temperature of at least about 1500.degree. C. for a sufficient time to cause said coating mixture to fuse into a smooth black coating.
Dependencies are inferred from the claim text.