A preparation method of electrothermal alloy and the prepared electrothermal alloy material

An electrothermal alloy and intermediate alloy technology, applied in the field of materials, can solve the problems such as the inability to effectively control the number of defects, the difficulty of alloy resistivity, etc., and achieve great economic significance and market value, and the effect of increasing the resistivity and increasing the resistivity

Active Publication Date: 2022-01-21
江苏佳腾新材料有限公司
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Problems solved by technology

[0009] The technical problem to be solved by the present invention is that the highest resistivity of the Fe-Cr-Al electrothermal alloy on the market is only 1.53 μΩ·m. It is extremely difficult to increase the resistivity of the alloy by controlling the composition of the existing technical solutions, and the traditional process incidentally produces Defects can increase the resistivity, but the number of defects cannot be effectively controlled. A method for preparing an electrothermal alloy and the prepared electrothermal alloy material are provided.

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  • A preparation method of electrothermal alloy and the prepared electrothermal alloy material
  • A preparation method of electrothermal alloy and the prepared electrothermal alloy material

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Embodiment 1

[0049] The preparation method of the electrothermal alloy in this embodiment uses the composition of 0Cr21Al6Nb alloy as the basis for composition control, and the ratio of the addition of alloy elements is shown in Table 1. The specific operation method of smelting is as follows:

[0050] S1. Cr-Nb eutectic alloy is smelted in advance for use; when Cr-Nb eutectic alloy is smelted in advance, the melting temperature is 2510-2520°C, and the holding time is 1.5min, that is, Cr and Nb are smelted into a melt;

[0051] S2. Determine the total mass of the electrothermal alloy for each smelting, and calculate the mass of each alloy element; change the added Nb metal element to add Cr-Nb eutectic alloy, and calculate the mass of Nb required for smelting, use Cr-Nb The quality of Nb contained in the eutectic alloy is replaced, and the quality of the Cr element in the added Cr-Nb eutectic alloy is calculated, and the quality of the missing Cr element is calculated; then the balance met...

Embodiment 2

[0060] The preparation method of the electrothermal alloy in this embodiment uses the composition of 0Cr21Al6Nb alloy as the basis for composition control, and the ratio of the addition of alloy elements is shown in Table 1. Its concrete smelting operation method is basically the same as embodiment 1, and its difference is:

[0061] S1. When melting the Cr-Nb eutectic alloy in advance, the melting temperature is 2500-2510 ° C, and the holding time is 3 minutes, that is, Cr and Nb are smelted into a melt. The steps of S2 and S3 are the same as those in Example 1 to make an iron-chromium-aluminum electrothermal alloy ingot. Then roll it into a thin strip, and perform the first annealing (recrystallization annealing). The annealing options include roller bottom annealing or pit furnace annealing to reduce the hardness of the alloy and facilitate subsequent processing. The recrystallization annealing temperature is 820-850° C., and the holding time is 10 minutes.

[0062] Subseq...

Embodiment 3

[0064] The preparation method of the electrothermal alloy in this embodiment uses the composition of 0Cr21Al6Nb alloy as the basis for composition control, and the ratio of the addition of alloy elements is shown in Table 1. The specific smelting operation method is basically the same as that of Example 1, the difference is: S3. When smelting the electric heating alloy, put the metal aluminum, industrial pure iron, Cr-Nb master alloy, and the balance metal Cr into the intermediate frequency vacuum in sequence In the induction melting furnace, evenly disperse the silicon powder powder into the middle and upper layers, so that the silicon powder powder is dispersed in the electrothermal alloy matrix; the melting temperature is set to 1950-2000 ℃ in gradient, and the holding time is 2-4min, 1770-1800 ℃ Heat preservation for 3-5 minutes, heat preservation at 1600°C-1630°C for 1-3 minutes, after repeated melting (can be adjusted according to the specific process, 3 to 5 times in thi...

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Abstract

The invention discloses a method for preparing an electric heating alloy, using the existing iron-chromium-aluminum electric heating alloy or a new iron-chromium-aluminum electric heating alloy as the target iron-chromium-aluminum electric heating alloy; and then casting the ingot of the target iron-chromium-aluminum electric heating alloy Rough rolling into a strip, after the strip is annealed, spray semiconductor powder on both sides of the strip; after the semiconductor powder is inlaid on both sides of the strip, finish rolling is carried out, and the finished electrothermal alloy product is obtained after finishing rolling forming treatment; By adjusting the composition of the alloy and adjusting the preparation process of the overall electrothermal alloy, the resistivity of the iron-chromium-aluminum electrothermal alloy can be significantly increased to meet the use requirements and bring new breakthroughs in the use of the electrothermal alloy, which has great economic significance and market value.

Description

technical field [0001] The invention relates to the field of material technology, and more specifically, to a method for preparing an electrothermal alloy and the prepared electrothermal alloy material. Background technique [0002] Electrothermal alloys refer to functional electrothermal engineering materials that use the resistance characteristics of alloys to generate Joule heat to convert electrical energy into thermal energy. There are two main types of electrothermal alloys: one is iron-chromium-aluminum alloy with ferrite structure; the other is nickel-chromium alloy with austenite structure. These two types of alloys have different properties due to their different structures. Its performance requirements mainly include the following three points: First, it should have good oxidation resistance (or corrosion resistance to medium atmosphere) and sufficient creep resistance at high temperatures. Second, it should have a higher resistivity, and the temperature coeffic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/06C22C38/02C22C38/06C22C38/12C22C38/18H05B3/12
CPCC22C33/06C22C38/06C22C38/02C22C38/18C22C38/005C22C38/12H05B3/12
Inventor 夏勇谢盛辉涂先猛丁莎孙翱魁刘跃军
Owner 江苏佳腾新材料有限公司
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