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Method for forming functional layer on porous metal base material

A porous metal and functional layer technology, applied in metal material coating process, coating, solid-state diffusion coating, etc., can solve problems such as unsatisfactory high temperature resistance, retention, environmental pollution, etc., achieve excellent environmental performance, improve durability The effect of high temperature performance

Inactive Publication Date: 2011-07-13
CHANGSHA LYRUN NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of forming a functional layer on a porous substrate is currently mostly the use of processes such as thermal spraying, electroplating, and powder melting on the surface of the substrate. However, this type of process, on the one hand, causes serious environmental pollution; The formation of functional coatings is greatly limited by the pore size and thickness of porous materials, and the high temperature resistance is still not ideal. Third, the processing equipment requires vacuum or inert atmosphere, and the investment in equipment is large.
As for the powder metal infiltration process, the current research basically stays on the application of dense substrates such as metal workpieces and metal plates. Whether this method can be applied to porous metal materials and how to apply it has no research material reference.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The porous nickel material comprising the nickel-chromium alloy functional layer is prepared according to the following steps:

[0015] The first step: mix 200-mesh chromium powder, 200-mesh alumina powder and ammonium chloride powder according to the ratio of chromium powder: alumina powder: ammonium chloride powder=30:68:2 and dry to prepare a high-temperature-resistant seepage powder. Powder;

[0016] The second step: the hole diameter is 45PPI, the thickness is 10mm, and the surface density is 4000g / m 2 The porous nickel substrate is embedded in the above mixed powder, and then treated at 1100°C for 2 hours, and the material in the powder can be taken out after cooling.

[0017] After testing, the permeation layer of the material prepared by the above process has a weight gain of 24%. According to electron microscopy and elemental analysis, a nickel-chromium alloy with a gradient distribution of chromium content is formed on the inner and outer surfaces of the skel...

Embodiment 2

[0019] A porous iron-nickel material comprising an iron-nickel-chromium-aluminum alloy functional layer is prepared according to the following steps:

[0020] Step 1: Mix 100-mesh chromium powder, 100-mesh aluminum powder, 100-mesh silicon carbide powder and ammonium chloride powder according to the ratio of chromium powder: aluminum powder: silicon carbide powder: ammonium chloride powder = 24:4:68:4 After homogenization and drying, it is prepared into high temperature resistant penetrating agent powder;

[0021] The second step: the hole diameter is 10PPI, the thickness is 50mm, and the surface density is 15000g / m 2 The porous iron-nickel substrate is embedded in the above mixed powder, and then treated at 900°C for 6 hours, and the material in the powder can be taken out after cooling.

[0022] After testing, the weight of the permeated layer of the material prepared by the above-mentioned process increases by 30%, and it is determined by electron microscopy and elemental ...

Embodiment 3

[0024] The porous iron-nickel material comprising the iron-nickel-tungsten alloy functional layer is prepared according to the following steps:

[0025] The first step: mix 400 mesh tungsten iron powder, 400 mesh kaolin powder (roasted at 1100°C for 1 hour) and ammonium chloride powder according to the ratio of tungsten powder: alumina powder: ammonium chloride powder = 55:50:5 Dried to prepare high temperature resistant penetrating agent powder;

[0026] The second step: the hole diameter is 120PPI, the thickness is 1.5mm, and the surface density is 800g / m 2 The porous iron-nickel substrate is embedded in the above mixed powder, and then treated at 1000°C for 3 hours, and the material in the powder can be taken out after cooling.

[0027] After testing, the weight gain of the permeated layer of the material prepared by the above process is 10%, and it is determined by electron microscope and elemental analysis that iron-nickel-tungsten alloy is formed on the inner and outer ...

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Abstract

The invention provides a method for forming a functional layer on a porous metal base material, which comprises the following steps of: putting the porous metal base material into high-temperature resistant penetrating agent powder consisting of metal powder, filling agent and energizer, and thermally treating the porous metal base material for certain time at the temperature of between 900 and 1,200 DEG C. The metal powder consists of one or more of Cr, Al, Mn, Co, Mo, Ti, W, V and Re; the filling agent is selected from one or more of aluminum oxide, silicon oxide, silicon carbide, zirconium oxide, boron nitride and ceramic powder; and the energizer is ammonium halide. A hot penetration process for the metal powder is successfully applied to the porous metal material, and certain applicable process conditions are found; an alloy coating with a good protective film is formed on the porous metal base material by the method; and in addition, the method is a dry process, does not produce waste water or waste gas, basically does not pollute the environment, and has excellent environmentally-friendly performance.

Description

technical field [0001] The present invention relates to a method for forming a functional layer, in particular to a method for forming a functional layer on a porous metal substrate. Background technique [0002] Various porous metal materials are commonly used in many fields, such as nickel foam for battery substrates, iron-nickel foam for filter materials, etc. Different application fields have different performance requirements for porous metal materials. When porous metal materials are applied to motor vehicle exhaust purification substrates and high-temperature environment filter materials, their high-temperature oxidation resistance is a key indicator to consider. The method of forming a functional layer on a porous substrate is currently mostly the use of processes such as thermal spraying, electroplating, and powder melting on the surface of the substrate. However, this type of process, on the one hand, causes serious environmental pollution; The formation of functi...

Claims

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Application Information

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IPC IPC(8): C23C10/34
Inventor 蒋素斌谢红雨朱济群唐文进俞钧陈立辉王洁琼
Owner CHANGSHA LYRUN NEW MATERIAL CO LTD
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