CN101831674A - Porous chromium alloy material and preparation method thereof - Google Patents
Porous chromium alloy material and preparation method thereof Download PDFInfo
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- CN101831674A CN101831674A CN201010301336A CN201010301336A CN101831674A CN 101831674 A CN101831674 A CN 101831674A CN 201010301336 A CN201010301336 A CN 201010301336A CN 201010301336 A CN201010301336 A CN 201010301336A CN 101831674 A CN101831674 A CN 101831674A
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Abstract
The invention relates to a porous chromium alloy material and a preparation method thereof, wherein the porous chromium alloy material is in a three-dimensional netted structure, a base material is porous metallic iron, nickel or an iron-nickel alloy, metallic chromium is plated on the surface of the base material, and the mass of the chromium accounts for 5-30 percent of the gross mass of a metal material. The preparation method thereof comprises the following steps of: plating the chromium on the surface of the porous metallic iron, the nickel or the iron-nickel alloy; and then, carrying out heat processing on the iron, the nickel or the iron-nickel alloy after chromium plating in a heat processing furnace. The porous chromium alloy material has high temperature resistance, higher strength, simple preparation process and low cost and is suitable for large-scale production.
Description
Technical field
The present invention relates to a kind of alloy material and preparation method thereof, particularly relate to a kind of porous chromium alloy material and preparation method thereof.
Background technology
Commonly used in a lot of fields to various porous metal materials, as the nickel foam that cell base is used, the foam copper that filtering material is used etc.Chromium is considered to have resistance to elevated temperatures, and therefore, porous chromium alloy is considered to be suitable for use as the motor vehicle tail-gas purifying base material.Mostly its preparation method at present, is to adopt in technologies such as substrate surface heat spray chromium, chromizings, but this class technology, the one, the cost height, the 2nd, it is inhomogeneous to cover chromium, and amount of coating is wayward, therefore, its resistance to elevated temperatures is subjected to very big influence, and has limited using and producing of porous chromium alloy greatly.
Summary of the invention
The present invention aims to provide a kind ofly has well high temperature resistant, higher-strength, porous chromium alloy material that manufacturing cost is lower, and a kind of preparation method who is fit to scale operation with low cost is provided.
Technical scheme of the present invention is as follows:
The present invention's porous chromium alloy material is tridimensional network, and base material is porous metal iron, nickel or iron-nickel alloy, the metal-coated chromium of substrate material surface, and the quality of chromium accounts for 5～30% of metallic substance total mass.
For improving material property, the plating amount of chromium metal should be no less than 20 gram/square meters.
The method for preparing described porous chromium alloy material may further comprise the steps: (1) is at porous metal iron, nickel or iron-nickel alloy electroplating Cr onto surface; (2) in heat treatment furnace, the material behind the electrodeposited chromium is heat-treated.
Electrodeposited chromium can be selected following technology: chromic anhydride: 200-250g/L; Sulfuric acid: 1-2g/L; Trivalent chromium: 0.6-1.2g/L; Cr-1 additive: 12-20ml/L mainly is halogenation organic diacid such as bromination Succinic Acid, bromination propanedioic acid etc.; Chromium inhibiting fog agent, main component are tensio-active agent such as sodium lauryl sulphate etc., working concentration 1-2ml/L; Temperature: 30-60 ℃; Current density can be according to the size of material and the practical situation such as size of used power rectifier, 10-50A/dm
2All applicable; Electroplating time calculates and can learn by the Faraday's law formula then according to the alloy amount of required plating, current density, material area etc.
Heat-treating methods can be selected a kind of in following manner: the one, the atmosphere of reducible metal is arranged in the heat treatment furnace, and promptly feed the gas that metal is had reductive action in the heat treated stove, as the mixed gas of hydrogen, nitrogen; The 2nd, adopt vacuum heat-treating method; The temperature of two kinds of heat treatment modes is 800-1000 ℃, soaking time 4～8 hours.
Compared with prior art, the present invention has following advantage:
(1) porous chromium alloy product of the present invention is covered with by heat treated chromium metal owing to its surface, chromium and matrix metal alloying, make material have good high temperature oxidation resisting effect, experiment shows that product is incubated 2h under 900 ℃ high temperature, its oxidation weight gain rate is less than 4%, and still can keep good intensity, therefore be suitable for automobile exhaust gas purifying installation;
(2) the present invention adopts electrochemical plating metal lining chromium on porous substrate, and not only cost is low, and being evenly distributed of chromium metal, the rate of permeation height, and alloying level height after the thermal treatment further improves the pyro-oxidation resistance of material.
Embodiment
The invention will be further described below in conjunction with embodiment.
Embodiment 1
The porous chromium alloy material of present embodiment is tridimensional network, and base material is the porous iron nickelalloy, and the porous iron nickel alloy surfaces is coated with chromium metal, and the quality of chromium accounts for 28% of metallic substance total mass; The amount of being covered with of chromium metal is 1550 gram/square meters.
Preparation: at thick 10mm, 30PPI, area density (amount of metal on the unit surface) 4000g/m
2The surface of foam iron-nickel alloy base material, electrodeposited chromium, electroplate liquid is: chromic anhydride: 250g/L sulfuric acid: the 2g/L trivalent chromium: 1.2g/L Cr-1 additive: 20ml/L chromium inhibiting fog agent: 2ml/L; Current density is 20A/dm
2, temperature is 50 ℃.The amount of metal lining chromium reaches 1550g/m
2After stop to electroplate.Work in-process after electroplating are placed heat treatment furnace, feed the mixed gas of hydrogen and nitrogen in the stove, thermal treatment temp is 950 ℃, and soaking time is 5 hours.Be tridimensional network through above-mentioned operation gained porous iron nichrome product, the whole prod total metal content is 5550g/m
2, wherein chromium accounts for 28% of material total mass.
Present embodiment porous iron nichrome product and two kinds of materials of foam iron-nickel alloy are incubated 2h under 900 ℃ the high temperature simultaneously in retort furnace, the former oxidation weight gain rate is about 3.2%, less than 4%, the latter is then up to 18.7%, and the former still can maintain the strength level before handling behind high temperature oxidation, the latter does not then have intensity substantially, touches promptly broken.
Embodiment 2
The porous chromium alloy material of present embodiment is tridimensional network, and base material is a nickel foam, and nickel foam is surface-coated chromium metal, and the quality of chromium accounts for 17% of material total mass; The amount of being covered with of chromium metal is 88 gram/square meters.
Preparation: at thick 1.6mm, 110PPI, area density (amount of metal on the unit surface) 420g/m
2The surface of nickel porous base material, electrodeposited chromium, electroplate liquid is: chromic anhydride: 200g/L sulfuric acid: the 1g/L trivalent chromium: 0.6g/L Cr-1 additive: 12ml/L chromium inhibiting fog agent: 1ml/L; Current density is 30A/dm
2, temperature is 60 ℃., the amount of the chromium of metal lining reaches 88g/m
2After stop to electroplate.Work in-process after electroplating are placed heat treatment furnace, feed the mixed gas of hydrogen and nitrogen in the stove, thermal treatment temp is 1000 ℃, and soaking time is 4 hours.Be tridimensional network through above-mentioned operation gained porous iron nichrome product, the whole prod total metal content is about 530g/m
2, wherein chromium accounts for 17% of alloy material total mass.
Two kinds of materials of present embodiment nickel porous Chrome metal powder product and nickel foam are incubated 2h simultaneously under 900 ℃ high temperature in the retort furnace, the former oxidation weight gain rate is about 2.8%, less than 3%, the latter is then up to 12.5%, and the former still can maintain the strength level before handling behind high temperature oxidation, latter's intensity reduces greatly.
Embodiment 3
The porous chromium alloy material of present embodiment is tridimensional network, and base material is a foam iron, and the foam iron surface is coated with chromium metal, and the quality of chromium accounts for 9% of material total mass; The amount of coating of chromium metal is 55 gram/square meters.
At thick 3mm, 60PPI, area density (amount of metal on the unit surface) 500g/m
2Porous iron base material surface, electrodeposited chromium, electroplate liquid is: chromic anhydride: 230g/L sulfuric acid: the 1.8g/L trivalent chromium: 0.8g/L Cr-1 additive: 18ml/L chromium inhibiting fog agent: 1.8ml/L; Current density is 10A/dm
2, temperature is 40 ℃.The amount of the chromium of metal lining reaches 55g/m
2After stop to electroplate.Work in-process after electroplating are placed vacuum heat treatment furnace, and thermal treatment temp is 800 ℃, and soaking time is 8 hours.Be tridimensional network through above-mentioned operation gained porous iron nichrome product, the whole prod total metal content is 555g/m
2, wherein chromium accounts for 9% of alloy material total mass.
Hole ferrochrome exothermic product more than the present embodiment and two kinds of materials of foam iron are incubated 2h simultaneously under 900 ℃ high temperature in the retort furnace, the former oxidation weight gain rate is about 3.8%, less than 4%, the latter is then up to 25.7%, and the former still can maintain the strength level before handling behind high temperature oxidation, the latter does not then have intensity substantially, touches promptly broken.
Claims (7)
1. porous chromium alloy material, it is characterized in that: be tridimensional network, base material is porous metal iron, nickel or the alloy of the two, the metal-coated chromium of substrate material surface, the quality of chromium accounts for 5～30% of metallic substance total mass.
2. porous chromium alloy material according to claim 1 is characterized in that: the plating amount of described chromium metal is no less than 20 gram/square meters.
3. preparation method of porous chromium alloy material as claimed in claim 1 or 2, it is characterized in that: may further comprise the steps: (1) is at porous metal iron, nickel or iron-nickel alloy electroplating Cr onto surface; (2) material that in heat treatment furnace step (1) is obtained is heat-treated.
4. according to the preparation method of the described porous chromium alloy material of claim 4, it is characterized in that: a kind of in the following manner selected in described thermal treatment for use: the one, the atmosphere of reducible metal is arranged in the heat treatment furnace, and the 2nd, adopt vacuum heat-treating method.
5. according to the preparation method of claim 3 or 4 described porous chromium alloy materials, it is characterized in that: electrodeposited chromium technology is chromium anhydride concentration 200-250g/L in the electroplate liquid, sulfuric acid concentration 1-2g/L, trivalent chromium concentration 0.6-1.2g/L, Cr-1 additive concentration 12-20ml/L, chromium inhibiting fog agent 1-2ml/L; Temperature 30-60 ℃.
6. according to the preparation method of claim 3 or 4 described porous chromium alloy materials, it is characterized in that: described thermal treatment temp is 800-1000 ℃, soaking time 4～8 hours.
7. according to the preparation method of the described porous chromium alloy material of claim 5, it is characterized in that: described thermal treatment temp is 800-1000 ℃, soaking time 4～8 hours.
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| CN201010301336A CN101831674A (en) | 2010-02-08 | 2010-02-08 | Porous chromium alloy material and preparation method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102011568A (en) * | 2010-10-15 | 2011-04-13 | 长沙力元新材料有限责任公司 | Filter screen material for sand control pipe in oil exploitation |
| CN103328693A (en) * | 2011-01-17 | 2013-09-25 | 富山住友电工株式会社 | Porous metal having high corrosion resistance and process for producing same |
| CN106048705A (en) * | 2016-07-19 | 2016-10-26 | 中国科学院青海盐湖研究所 | Foam chromium and preparation method thereof |
-
2010
- 2010-02-08 CN CN201010301336A patent/CN101831674A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102011568A (en) * | 2010-10-15 | 2011-04-13 | 长沙力元新材料有限责任公司 | Filter screen material for sand control pipe in oil exploitation |
| CN103328693A (en) * | 2011-01-17 | 2013-09-25 | 富山住友电工株式会社 | Porous metal having high corrosion resistance and process for producing same |
| CN106048705A (en) * | 2016-07-19 | 2016-10-26 | 中国科学院青海盐湖研究所 | Foam chromium and preparation method thereof |
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Application publication date: 20100915 |