X-ray tube anode with oxide coating
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United States of America Patent
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Oct 20, 1992
Grant Date -
N/A
app pub date -
Oct 2, 1990
filing date -
Oct 2, 1989
priority date (Note) -
Expired
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Abstract
The invention relates to enhancing the thermal emissivity of metal X-ray tube anodes by means of applying an oxide coating to the anode. The oxide coating layer is formed of a mixture of zirconium oxide, titanium oxide, aluminum oxide and/or calcium oxide, with silicon oxide added from about 1-20% by weight of said oxide coating layer. Preferably, the coating includes from about 4-7% by weight of silicon oxide. The oxide coating layer is then applied to the anode pursuant to a standard method such as plasma spraying. The oxide coating, as formulated, displays improved layering characteristics over prior formulations while retaining good thermal emissivity and adhesive properties. Moreover, the formulation according to the invention enables an improved application to the anode of such oxides or oxide compounds over previous formulations, without negatively affecting the layer adhesion or thermal emission coefficient properties of the coating. Small quantities of other stabilizing oxide compounds may additionally be added to the oxide coating layer.
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