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Method for preparing porous metal by coating iron powder with nickel-phosphorus alloy by high temperature heat treatment

A high-temperature heat treatment and nickel-phosphorus alloy technology, which is applied in the field of porous metals, can solve the problems of difficult and precise control of pore distribution uniformity, and achieve the effects of easy control of porosity, uniform pores, and good corrosion resistance

Active Publication Date: 2016-03-02
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional powder sintering method has disadvantages such as difficult to precisely control the uniformity of pore distribution.

Method used

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  • Method for preparing porous metal by coating iron powder with nickel-phosphorus alloy by high temperature heat treatment
  • Method for preparing porous metal by coating iron powder with nickel-phosphorus alloy by high temperature heat treatment
  • Method for preparing porous metal by coating iron powder with nickel-phosphorus alloy by high temperature heat treatment

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1. Prepare the composite iron-based powder coated with Ni-P alloy, and the thickness of Ni-P coating is about 7 μm;

[0025] The preparation method of nickel-phosphorus alloy-coated iron powder comprises the following steps: 1). Mix the following components with deionized water in proportion: nickel sulfate 25-35g / L, sodium hypophosphite 25-35g / L, citric acid 15~25g / L, sodium acetate 10~20g / L, trace amount of potassium iodide, surfactant 1~5mg / L, adjust pH value to 4~5 with sodium hydroxide; 2). Put iron powder in alkaline degreasing bath Carry out chemical degreasing, the degreasing temperature is 70-80°C, and the time is 5-15min; 3) Immerse the degreasing iron powder in a dilute sulfuric acid solution with a mass percentage of 5%-10% for 1-3min, and rinse with deionized water ; 4). After the plating solution in step 1) is heated to 60°C, the iron powder activated by pickling is added to the plating solution in an amount of 1-10g / L, and the plating temperature is 65-75...

Embodiment 2

[0032] 1. Prepare the composite iron-based powder coated with Ni-P alloy, and the thickness of Ni-P coating is about 8 μm;

[0033] The preparation method of nickel-phosphorus alloy-coated iron powder comprises the following steps: 1). Mix the following components with deionized water in proportion: nickel sulfate 25-35g / L, sodium hypophosphite 25-35g / L, citric acid 15~25g / L, sodium acetate 10~20g / L, trace amount of potassium iodide, surfactant 1~5mg / L, adjust pH value to 4~5 with sodium hydroxide; 2). Put iron powder in alkaline degreasing bath Carry out chemical degreasing, the degreasing temperature is 70-80°C, and the time is 5-15min; 3) Immerse the degreasing iron powder in a dilute sulfuric acid solution with a mass percentage of 5%-10% for 1-3min, and rinse with deionized water ; 4). After the plating solution in step 1) is heated to 60°C, the iron powder activated by pickling is added to the plating solution in an amount of 1-10g / L, and the plating temperature is 65-75...

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Abstract

The invention relates to a porous preparation method through subjecting nickel-phosphor alloy coated iron powder to a high temperature thermal treatment. The preparation method comprises the following steps: (1) preparing nickel-phosphor alloy coated iron powder; (2) evenly mixing the nickel-phosphor alloy coated iron powder with an adhesive; (3) painting the mixture of the nickel-phosphor alloy coated iron powder and adhesive on a carbon steel sample block, the thickness of the coating is 50 to 300 [mu]m; (4) drying the painted sample block in the air; (5) placing the sample block into a tube heating furnace to carry out a high temperature thermal treatment, wherein in the high temperature thermal treatment, nitrogen gas is introduced into the furnace at first, and then hydrogen gas is introduced into the furnace; (6) maintaining the tube heating furnace temperature at 300 DEG C for 10 to 20 minutes, then heating the furnace to a temperature of 900 DEG C to carry out thermal treatment for 0.5 to 2 hours, and then cooling the sample block in the furnace so as to obtain the porous metal. The pore size of the porous metal is even, the porosity is easy to control, and moreover the surface of the porous metal is covered by a layer of Ni-P alloy, so the porous metal is resistant to corrosion.

Description

【Technical field】 [0001] The invention relates to the technical field of porous metals, in particular to a method for preparing porous metals by high-temperature heat treatment of nickel-phosphorus alloy-coated iron powder. 【Background technique】 [0002] Sintered metal porous materials are a class of functional materials with special properties, characterized by a large number of connected or semi-connected pores inside, widely used in aerospace, atomic energy, transportation, petrochemical, biological, mechanical, medical, construction, environmental protection, etc. in the industry. With the development of modern industry and the combination of metal porous materials with the characteristics of high mechanical strength, weldability, corrosion resistance, high temperature resistance, and easy processing, metal porous materials have shown strong functionality, wide application range, and continuous new varieties. The scene of the emergence and continuous expansion of the u...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/08
Inventor 侯峰徐宏刘京雷张莉王元华全坤
Owner EAST CHINA UNIV OF SCI & TECH