High porosity foam nickel base alloy and preparation method thereof

A technology of foamed nickel and base alloy, which is applied in the field of high-porosity nickel-based foam and its preparation, can solve the problems of reduced mechanical properties, uneven porosity size control, rough surface of skeleton, etc., and achieves improved mechanical strength and high temperature performance, Improve high temperature and oxidation resistance, improve the effect of overall compressive strength

Inactive Publication Date: 2017-05-31
CHANGDE LYRUN MATERIAL
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Cracks will appear in the skeleton of the foam alloy, resulting in a decrease in mechanical properties, or the surface of the skeleton is rough, or even blocked, which deteriorates the permeability of the foamed nickel-based alloy.
[0003] Previously, the preparation methods of high-porosity foamed nickel-based alloys mainly included alternate electrodeposition method and solid powder embedding method. The resulting material has low strength and uneven porosity size control

Method used

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  • High porosity foam nickel base alloy and preparation method thereof

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Effect test

Embodiment 1

[0018] The following materials were mixed to prepare a slurry (percentage by weight): Cr powder with an average particle size of 5um: 70, Si powder: 1.2, acrylic resin: 20, CMC: 0.5\ii: 8.3. Dip the slurry into a polyurethane foam with a thickness of 10mm and a hole diameter of 2.5mm (about 10PPI), and squeeze out the excessively adhered slurry with a pair of rollers. The foam thus obtained was dried at 120°C for 30 minutes. The foamed plastics are formed nickel deposition layer in Watt plating solution by 4000g / m2, pulse frequency is 30KHz, current density is 3A / dm2, the Reynolds number 600 of plating solution in the tank. The foam was pyrolyzed, heated to 700°C in H2 at a rate of 10°C / min, and kept for 1 hour to prepare nickel foam with a three-dimensional network structure with Cr powder adsorbed on the inner surface of the skeleton. In this step, the foam plastic, acrylic resin, etc. were basically thermally decomposed, and the analysis results showed that the residual C ...

Embodiment 2

[0020] For polyurethane foam plastics having a thickness of 5 mm and a pore diameter of 1.3 mm, the slurry is prepared and coated in the same proportion and method as in Example 1, and the polyurethane foam plastic soaked in the slurry is extruded with a pair of rollers to remove excess slurry As a material, the polyurethane foam containing metal Cr powder slurry obtained by the above method was placed at room temperature for 15 minutes, and then dried at 80°C for 10 minutes to obtain a surface coated with Cr powder and a foam with a surface density of 1100g / m2. Subsequently, the foamed plastic was formed into a nickel deposition layer in a Watt plating solution at a rate of 3600g / m2, with a pulse frequency of 20KHz and a current density of 2.5A / dm2. Heat-treat the foamed plastic after depositing nickel at 750°C for 0.5h in Ar gas. Alloy the metal nickel foam with Cr powder adsorbed on the inner surface of the skeleton, pass Ar gas at a rate of 300ml / min, heat to 1250°C at the...

Embodiment 3

[0022] According to the composition (percentage by weight) of the following slurry: Al powder with an average particle diameter of 5um: 42, Si powder: 2.5, alkyd resin: 26, CMC: 1 and water: 28.5, prepare the slurry, and adopt the method of embodiment 1 In the same way, a polyurethane foam having a thickness of 7 mm and a cell diameter of 0.5 mm was coated. The polyurethane foam containing Al powder obtained by the above method was placed at room temperature for 1.5h to obtain a foam whose surface was coated with Al powder and an area density of 450g / m2. Subsequently, the foamed plastic was placed in a Watt plating solution at 3600g / m2 to form a uniform nickel deposition layer, the pulse frequency was 25KHz, and the current density was 1.5A / dm2. Heat-treat the foam plastic after electrodeposited nickel, in Ar gas, heat at 750°C for 1.5h to remove the resin core and organic components. Alloy the nickel foam with Al powder adsorbed on the inner surface of the skeleton, pass Ar ...

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Abstract

The invention provides a high porosity foam nickel base alloy and a preparation method thereof. The foam nickel base alloy is composed of the following elements in percentages by weight: 63.0-97.5% of Ni, 2-35% of Cr or Al and 0.5-2.0% of Si. The preparation method comprises the following steps: coating a soft polyurethane foaming plastic with aqueous resin slurry comprising Cr or Al powder, Si powder and carboxymethylcellulose and drying the plastic; electroplating the plastic in a watt plating solution for 2-6 hours; heating the plastic in a non-oxidized atmosphere; and alloying the plastic in a vacuum or inertial atmosphere for 5-20 hours. The foam nickel base alloy framework is level in surface, free of cracks, high in porosity, good in trafficability characteristic, high in mechanical strength and excellent in oxidation resistance. The preparation method is free of hexavalent Cr pollution, easy to realize a design of alloy component and prepare high Cr or high Al foam Ni base alloy, simple in process and suitable for scaled production.

Description

technical field [0001] The invention relates to a nickel-based alloy and a preparation method thereof, in particular to a high-porosity foamed nickel-based alloy and a preparation method thereof. Background technique [0002] The existing high-porosity foamed nickel-based alloy has a three-dimensional network structure, high porosity, controllable pore size, and high-temperature oxidation resistance, so it has broad application prospects in various catalyst carriers, filters, and heat exchangers. But there are also some shortcomings. Cracks may appear in the skeleton of the foam alloy, resulting in reduced mechanical properties, or the surface of the skeleton is rough, or even blocked, which deteriorates the permeability of the foamed nickel-based alloy. [0003] Previously, the preparation methods of high-porosity foamed nickel-based alloys mainly included alternate electrodeposition method and solid powder embedding method. The resulting material has low strength and une...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C19/03C22C19/05C22C1/08C25D5/18
Inventor 余兴华易秋珍钟建夫朱济群
Owner CHANGDE LYRUN MATERIAL
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