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A nickel-chromium electrothermal composite material and its preparation method

A composite material, nickel-chromium alloy technology, applied in the field of composite materials, can solve the problems of not meeting the needs well, limiting the scope of use, shortening the service life, etc., to improve the microstructure, avoid floating and precipitation, and increase the resistivity. Effect

Active Publication Date: 2016-06-15
YANCHENG XINYANG ELECTROTHERMAL MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It not only limits the scope of use, but also seriously shortens the service life
Therefore, when the above two alloys are used at high temperatures, they cannot well meet the needs of current industrial products.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0015] Further illustrate and understand the present invention through embodiment below.

[0016] Examples were prepared as follows:

[0017] (1) Prepare additives, weigh according to the mass ratio of germanium oxide 11%, silicon dioxide 22%, titanium boride 7%, cerium oxide 7%, silicon carbide 41%, and the balance is cobalt oxide, and mix them After grinding for 22 hours, the average particle size is controlled at 0.06-0.07mm

[0018] (2) Melt nickel-chromium alloy, melt under high vacuum conditions, carry out oxygen blowing decarburization after melting, and then carry out high-vacuum boiling, the boiling time is greater than 10min, and the nickel-chromium alloy is composed of: Al: 5%, Cr: 23.4 %, Hf: 0.8%, Zr: 2%, Zn: 0.5%, Ti: 0.6%, the balance is nickel and unavoidable impurities;

[0019] (3) Use feeding pliers to add the ground additive into the alloy liquid, boil at 1750° C. for 10 minutes, cast it into an ingot after standing, and the mass ratio of the nickel-chrom...

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PUM

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Abstract

The invention relates to a composite material, in particular to a nickel-chromium electrothermal composite material and a preparation method thereof. The composite material is prepared by adding germanium, silicon, titanium, boron, cerium, carbon and cobalt as additives to nickel-chromium alloy through smelting, and the room temperature resistivity of the composite material reaches 1.8Ωmm2 / m. The preparation method includes: preparing additives, melting nickel-chromium alloy, smelting, homogenizing annealing, hot-rolling wire rods, multi-pass drawing and post-drawing annealing and other processes. The finished material prepared by the invention has high resistivity, high temperature strength, excellent oxidation resistance and smaller thermal expansion coefficient, overcomes the shortcomings in the prior art, and has good industrial application prospects.

Description

Technical field: [0001] The invention relates to a composite material, in particular to a nickel-chromium electrothermal composite material and a preparation method thereof. Background technique: [0002] Electrothermal alloy materials are resistance alloys that use the resistance properties of substances to manufacture heating elements. Currently used electrothermal alloys are mainly divided into two categories: nickel-chromium alloys (such as Ni20Cr8) and iron-chromium-aluminum alloys (such as 0Cr25Al). Nickel-chromium alloys are not only expensive, but also their oxidation resistance decreases significantly when the operating temperature exceeds 1000°C. Fe-chromium-aluminum alloy has a series of advantages over nickel-chromium alloy, such as high allowable use temperature, high resistivity, easy hot and cold processing, etc., but it has a fatal weakness, strong brittleness, especially after high temperature use. It not only limits the scope of use, but also seriously sh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C19/05C22C32/00C22C1/10
Inventor 郭健郭小芳郭乃林
Owner YANCHENG XINYANG ELECTROTHERMAL MATERIAL CO LTD