Heat radiation anode
AssigneeTokyo Shibaura Electric Co., Ltd.
InventorsTakashi Kuze, Toshiharu Matsuki, Koji Nagaoka, Naoji Iwai
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Abstract
A heat radiation element has a substrate and a heat radiation layer formed on the substrate by oxides of a chromium-containing alloy. The oxides contain at least 35% by weight of chromium based on the total weight of the metals constituting the oxides.
Claims22
A heat radiation anode element comprising a substrate and a heat radiation layer formed on the substrate and comprising oxides of a chromium-containing alloy, the heat radiation layer containing at least 35% by weight of chromium based on the total weight of the metal components of the oxides, and an emissivity-improving agent selected from the group consisting of vanadium, titanium, zirconium, niobium and mixtures thereof, in an amount sufficient to improve the total emissivity of said heat radiation element.
A heat radiation anode element comprising:
- a substrate formed of a member selected from the group consisting of iron, nickel, chromium, copper, aluminum, silver, an iron-chromium alloy, a nickel-chromium alloy and an iron-nickel-chromium alloy;
- and
- a heat radiation layer formed on and tightly attached to the substrate consisting essentially of the oxides of a chromium-containing alloy selected from the group consisting of an iron-chromium alloy, a nickel-chromium alloy and an iron-nickel-chromium alloy, the chromium-containing alloy further containing 0.03 to 5% by weight of a member selected from the group consisting of vanadium, titanium, zirconium, niobium and mixtures thereof, the oxides constituting the heat radiation layer which itself contains at least 35% by weight of chromium in the form of oxides based on the total weight of the metal component of the oxides, the layer having a surface roughness of 0.3 to 5.mu. and a total emissivity of at least about 0.9, the ratio in density of the heat radiation layer to its theoretical density ranging from 0.7 to 0.8.
A heat radiation anode element comprising, in combination:
- a substrate;
- and
- a heat radiation layer formed on and tightly attached thereto, said layer constituted of a chromium-containing alloy selected from the group consisting of an iron-chromium alloy, a nickel-chromium alloy and an iron-nickel-chromium alloy,
- said layer containing from 35 to 99% by weight of chromium in the form of oxides thereof based on the total weight of the metal components of the oxides,
- said alloy further containing an emissivity-improving agent selected from the group consisting of vanadium, titanium, zironium, niobium and mixtures thereof,
- said emissivity-improving agent present in an amount such that the total emissivity of said layer is 0.71 to 0.98,
- said layer having a surface roughness of 0.3 to 5.mu. and the ratio in density of the heat radiation layer to its theoretical density is from 0.6 to less than 1.
A heat radiation anode element comprising, in combination:
- a substrate;
- and
- a heat radiation layer formed on and tightly attached thereto, said layer constituted of a chromium-containing alloy selected from the group consisting of an iron-chromium alloy, a nickel-chromium alloy and an iron-nickel-chromium alloy,
- said layer containing from 60 to 99% by weight of chromium in the form of oxides thereof based on the total weight of the metal components of the oxides,
- said alloy further containing from 0.03 to 5% by weight of an emissivity-improving agent selected from the group consisting of vanadium, titanium, zironium, niobium and mixtures thereof,
- said emissivity-improvement agent present in an amount such that the total emissivity of said layer is 0.71 to 0.98,
- said layer having a surface roughness of 0.3 to 5.mu. and the ratio in density of the heat radiation layer to its theoretical density is from 0.6 to less than 1.
Dependencies are inferred from the claim text.