JPS597790B2 - heat radiant material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to heat radiating materials, and particularly aims to further improve heat radiation by forming a highly adhesive black oxide film on the surface of a nickel alloy containing titanium.

Metal materials that are generally used for the internal parts of electron tubes, heating wires, etc. and meet the requirements for heat radiation include aluminum-coated iron and nickel soot material.

These materials blacken the surface. For example, aluminum-clad iron has a blackened surface by reacting iron and aluminum, and nickel sooting material has a blackened surface by attaching soot generated by burning organic matter to nickel. has been made into In order to improve heat radiation, in addition to increasing the degree of blackening, methods are also used to increase the surface area. For example, the surface is roughened by sandblasting or the like to improve heat radiation. However, aluminum-clad iron cannot be used at high temperatures, and the sooting material is laborious to work with and often scrapes and falls off from the base metal. All of them had the disadvantage that it was difficult to obtain the desired heat radiation. The present invention eliminates these drawbacks and provides a new material with good heat radiation.

In other words, by oxidizing a nickel alloy containing titanium at high temperature,
It is a thermal radiation material with an oxide film with an excellent degree of blackening formed on its surface. The oxide film produced on the surface by high-temperature oxidation has a good degree of blackening, can withstand high-temperature use, and of course does not peel off. For example, 1200℃ in a steam stream
When treated at high temperatures, an oxide film is formed on the surface of the nickel alloy containing titanium, and the degree of blackening is
．． According to 18721), the brightness is 2 and the color is close to the ideal black.

Therefore, since the degree of blackening and heat radiation are almost proportional,
Products using this material have extremely good heat radiation, making it a heat radiation material that is far superior to conventional materials in terms of heat radiation.
In addition, at least one of chromium, niobium, vanadium, zirconium, and aluminum is added to the nickel alloy containing titanium.
The seed-added material is oxidized at high temperature in the air or steam to form a black oxide film with a higher degree of blackening than before on its surface, improving heat radiation. Regarding the degree of blackening, the black oxide film formed on the surface of the heat radiating material of the present invention must be made mainly of titanium. (the same applies hereinafter) or higher is desirable. Furthermore, among the thermal radiation materials of the present invention, the degree of blackening of the surface obtained by high-temperature oxidation of a nickel alloy containing titanium to which at least one of chromium, niobium, vanadium zirconium, and aluminum is added is even more excellent, and these additive elements also It is also preferable for improving high temperature strength. The present invention is a radiation-emitting material made of a nickel alloy containing titanium, such as a titanium-nickel alloy, a titanium-chromium-nickel alloy, or an alloy in which at least one element such as vanadium is added to these alloys as described above, and is oxidized at a high temperature. An oxide film having a degree of blackness close to ideal black can be formed on each surface, which improves heat radiation and contributes to expanding the range of use.

The heat radiating material of the present invention has characteristics on its surface, and it is also preferable to use the material with its surface roughened, for example. Examples of the present invention will be described below.

An alloy to be used as a radiant material is melted to have the alloy composition shown in Table 1 below. The alloy shown in Table 1 above was prepared in wet hydrogen at 1
Table 2 below shows the degree of blackening and the proportion of titanium in the metal content of the black oxide film when oxidized at 200°C and at 900°C in the atmosphere.

The degree of blackening is indicated by brightness (according to JIS Z-8721), and the proportion of titanium in the metal content of the black oxide film is indicated by %.

As can be seen from Table 2 above, the thermal radiation material of the present invention has an excellent degree of blackening, but when nickel alloys containing titanium, to which chromium, vanadium, etc. are added, are oxidized at high temperature, the surface A desirable black oxide film is formed, making it an extremely superior heat radiating material compared to conventional materials. As a result of examining the oxide films formed on the above-mentioned heat radiating materials, it was found that the oxide films with an excellent degree of blackening had a titanium content of 25% or more in terms of the metal content of the oxide film. In the case of the titanium-nickel alloy mentioned above, the nickel content is 2
A range of 0% to 70% is suitable. If it is less than 20%, the workability will deteriorate, and if it exceeds 70%, it will not be effective to form an oxide film containing the desired amount of titanium.

In addition, in the case of titanium nickel chromium alloy, the combined content of nickel and chromium is preferably in the range of 30% to 80% (F6). In this case, anything outside this range will cause the same problems as above. Furthermore, the amount of vanadium added is 0.5%~
A range of 30 (!) is preferable; if it is less than 0.5%, there is no effect of improving the degree of blackening, and if it exceeds 30%, workability will deteriorate. The amount of aluminum, niobium, and zirconium added is 0.03 (L or less, there is no effect of increasing the degree of blackening, and 5%
If the content exceeds 0.03% to 5%, the processability becomes poor and it becomes difficult to use. As described above, the alloy of the present invention can form an oxide film with a significantly improved degree of blackening on its surface, so it can be used for internal parts of electron tubes, heating wires, hot water product parts, etc. that require good heat radiation. There are many things that can greatly contribute to improving the characteristics when used. Furthermore, since materials with good heat radiation also have excellent heat absorption, the range of application can be expanded to materials in fields related to heat absorption, such as components of solar heat absorption devices, and can contribute to improving their properties.

Claims (1)

[Scope of Claims] 1. Made of a nickel alloy containing titanium, consisting of 20% to 70% by weight of nickel and the balance being titanium, which has been oxidized at high temperature and has a black oxide film mainly composed of titanium on the surface, and the metal of the oxide film. A heat radiating material characterized in that titanium accounts for 25% by weight or more in minutes. 2 It is oxidized at high temperature to have a black oxide film mainly composed of titanium on the surface, and contains chromium, with a total content of nickel and chromium of 30%.
The oxide film is made of a nickel alloy consisting of 80% to 80% by weight, the balance being titanium, and the metal content of the oxide film is 2% titanium.
A heat radiating material characterized by having a content of 5% by weight or more. 3 Made of a nickel alloy consisting of 20% to 70% by weight of nickel, 0.5% to 30% by weight of vanadium, and the balance titanium, which has been oxidized at high temperature to have a black oxide film mainly composed of titanium on the surface, and the oxide film A thermal radiation material characterized in that titanium accounts for 25% by weight or more of the metal content. 4 20% to 70% by weight of nickel, which has a black oxide film mainly composed of titanium on the surface by high temperature oxidation, and 0.0% of at least one of aluminum, niobium, and zirconium.
It is made of a nickel alloy consisting of 3% to 5% by weight, the balance being titanium, and the metal content of the oxide film is 2% titanium.
A heat radiating material characterized by having a content of 5% by weight or more. 5 It is oxidized at high temperature to have a black oxide film mainly composed of titanium on the surface, and contains chromium, with a total content of nickel and chromium of 30%.
Thermal radiation is made of a nickel alloy consisting of 80% to 80% by weight of vanadium, 0.5% to 30% by weight of vanadium, and the balance is titanium, and the metal content of the oxide film is 25% by weight or more of titanium. material. 6 It has a black oxide film mainly composed of titanium on the surface by oxidation at high temperature, contains chromium, has a total amount of nickel and chromium of 30% to 80% by weight, contains at least one of aluminum, niobium, and zirconium, and contains 0.03 1. A thermal radiation material comprising a nickel alloy consisting of 5% by weight to 5% by weight, the balance being titanium, and wherein the oxide film has a metal content of 25% by weight or more of titanium. 7 Nickel 20% to 70% by weight, vanadium 0.5% to 30% by weight, aluminum, niobium, which has a black oxide film mainly composed of titanium on the surface by high temperature oxidation.
1. A thermal radiation material comprising a nickel alloy comprising 0.03% to 5% by weight of at least one kind of zirconium and the remainder titanium, and characterized in that titanium accounts for 25% by weight or more in the metal content of the oxide film. 8 It is oxidized at high temperature to have a black oxide film mainly composed of titanium on the surface, and contains chromium, with a total content of nickel and chromium of 30%.
% by weight to 80% by weight, 0.5% to 30% by weight of vanadium, 0.03% to 5% by weight of at least one of aluminum, niobium, and zirconium, the balance being titanium; A heat radiating material characterized in that the metal content of the film is 25% by weight or more of titanium.