CN202482411U - Pore structure of metal cellular material containing nitriding layers - Google Patents
Pore structure of metal cellular material containing nitriding layers Download PDFInfo
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- CN202482411U CN202482411U CN 201120559750 CN201120559750U CN202482411U CN 202482411 U CN202482411 U CN 202482411U CN 201120559750 CN201120559750 CN 201120559750 CN 201120559750 U CN201120559750 U CN 201120559750U CN 202482411 U CN202482411 U CN 202482411U
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Abstract
The utility model discloses a pore structure of a metal cellular material containing nitriding layers. The pore structure can enable the metal cellular material to have required pore size. The pore structure comprises pores distributed on the surface of the material, and the pore surfaces of the pores are provided with the infiltrated layers which are the nitriding layers. Due to the fact that the nitriding layers are arranged on the pore surfaces of the metal cellular material, lattice deformation expansion occurs on pore surface layers of the metal cellular material in the forming process of the nitriding layers, or novel phase layers are formed on inner surface layers of the pores, thereby enabling original pores on the metal cellular material to be reduced and achieving the purpose of adjusting the pore size.
Description
Technical field
The application relates to the thermo-chemical treatment technology to metal polyporous material.Wherein proposed to regulate the aperture of metal polyporous material first, thereby both guaranteed filtering accuracy, and can attach the surface property that improves metal polyporous material with thermo-chemical treatment; In addition, the application also relates to the pore structure through the metal polyporous material after the thermo-chemical treatment.
Background technology
Thermo-chemical treatment is meant and places the active media of certain temperature to be incubated metal works, makes one or more its top layers of elements infiltration, to change the thermal treatment process of its chemical ingredients, tissue and performance.Thermo-chemical treatment of a great variety, modal is carburizing, nitriding and carbonitriding.The purpose of thermo-chemical treatment generally is to improve surface abrasion resistance property, fatigue resistance and corrosion stability and the high temperature oxidation resistance of workpiece." TiAl base alloy surface carburization behavior and mechanism thereof, river Yao, He Yuehui etc., investigation of materials journal, the 19th the 2nd phase of volume, in April, 2005 ", the problem of improving the high-temperature oxidation resistance of TiAl base alloy through carburizing inquired in a literary composition; In addition, " TiAl base alloy surface carburization treatment process, Xu Qiang etc., heat treatment technics and equipment, the 29th the 5th phase of volume, in October, 2008 " also mentioned similar viewpoint.At present, chemical heat treatment process is mainly used in the surface property of improvement than the compact metal material, but does not see the application on metal polyporous material as yet.
On the other hand, have infiltrative characteristics based on metal polyporous material, people have developed the multiple filtering element of processing with metal polyporous material.Common metal polyporous material has stainless steel, copper and copper alloy, nickel and nickelalloy, titanium or titanium alloy etc.; The processability of this metalloid porous material is better, but erosion resistance is relatively poor.Also having a metalloid porous material is Al series intermetallic compound porous material, and it mainly comprises TiAl intermetallic compound porous material, NiAl intermetallic compound porous material, FeAl intermetallic compound porous material; The good advantage of the existing processability of this metalloid porous material has good erosion resistance simultaneously again concurrently.No matter be common metal polyporous material or Al series intermetallic compound porous material; They all create through powder metallurgic method; In its manufacturing processed; Several factors all can influence the final pore size of metal polyporous material, for example, and mean particle size, size-grade distribution, particle shape and sintering temperature of the powder of selecting for use or the like.
In a word; At present; When those skilled in the art require to regulate the aperture of metal polyporous material for adapting to different filtrations; Often only can seek the way of adjustment from the angle of powder metallurgical technique, because the adjustment of powder metallurgical technique is changed the mechanical property of material easily, so need usually just can determine feasible scheme through a large amount of trial-production; And regulatable aperture size magnitude range is limited.
The utility model content
The application aims to provide a kind of aperture adjustment method that realizes the metal polyporous material of aperture adjustment through thermo-chemical treatment.
For this reason, the aperture adjustment method of the application's metal polyporous material specifically is through the hole of at least a element being infiltrated material its mean pore size to be contracted in the certain limit.Infiltrate the hole surface of metal polyporous material when element after, cause that the lattice distortion expansion takes place on the hole top layer of metal polyporous material, or form the cenotype layer, thereby the original hole on the metal polyporous material is dwindled, to reach the purpose of adjustment aperture in the internal skin, hole.Therefore, this aperture adjustment method of the application is more convenient than existing aperture adjustment method, and controllability is better; And,, therefore can significantly not damage material mechanical performance because the application only is the processing that material surface is carried out.
Consider general filtering needs, the application's preferred version is to make its mean pore size be contracted to 0.05～100 μ m through the hole surface that at least a element is infiltrated material.
The amount that the material mean pore size is dwindled is relevant with concrete chemical heat treatment process.If material mean pore size reductions is very little, then can reduce the practical function of the application aspect aperture adjustment; And, then possibly cause filtration flux sharply to descend the original hole sealing on the metal polyporous material if material mean pore size reductions is very big.Therefore, the preferred scheme of the application is to make its mean pore size dwindle 0.1～100 μ m through the hole surface that at least a element is infiltrated material.
Further, said metal polyporous material is meant Al series intermetallic compound porous material.As preferably, said Al series intermetallic compound porous material is meant a kind of in TiAl intermetallic compound porous material, NiAl intermetallic compound porous material, the FeAl intermetallic compound porous material.
As preferably, the said element that infiltrated is meant in carbon, nitrogen, boron, sulphur, silicon, aluminium, the chromium one or more.
The application to the concrete technology that the TiAl intermetallic compound porous material carries out carburizing is: earlier the TiAl intermetallic compound porous material is placed the reactive atmosphere of carburizing; Be incubated 1～12h down at 800～1200 ℃ then; Simultaneously with carbon-potential control in the stove 0.8～1.0%, obtain the cementation zone that thickness is 1～30 μ m at last.
The application to the concrete technology that the NiAl intermetallic compound porous material carries out carburizing is: earlier the NiAl intermetallic compound porous material is placed the reactive atmosphere of carburizing; Be incubated 2～10h down at 800～1200 ℃ then; Simultaneously with carbon-potential control in the stove 1.0～1.2%, obtain the cementation zone that thickness is 0.5～25 μ m at last.
The application to the concrete technology that the FeAl intermetallic compound porous material carries out carburizing is: earlier the FeAl intermetallic compound porous material is placed the reactive atmosphere of carburizing; Be incubated 1～9h down at 800～1200 ℃ then; Simultaneously with carbon-potential control in the stove 0.8～1.2%, obtain the cementation zone that thickness is 1～50 μ m at last.
Above-mentioned carburization process to TiAl intermetallic compound porous material, NiAl intermetallic compound porous material, FeAl intermetallic compound porous material can access the cementation zone of thickness between 10-1 μ m～10 μ m orders of magnitude, thereby realizes the accurate control to depth of case.And, depth of case is maintained anti-oxidation-resistance of high temperature and the erosion resistance that this scope can obviously be improved material.
The application to the concrete technology that the TiAl intermetallic compound porous material carries out nitriding is: earlier the TiAl intermetallic compound porous material is placed the reactive atmosphere of nitriding; Be incubated 4～20h down at 800～1000 ℃ then; Simultaneously nitrogen gesture in the stove is controlled at 0.8～1.0%, obtains the nitrided case that thickness is 0.5～20 μ m at last.
The application to the concrete technology that the NiAl intermetallic compound porous material carries out nitriding is: earlier the NiAl intermetallic compound porous material is placed the reactive atmosphere of nitriding; Be incubated 2～26h down at 700～900 ℃ then; Simultaneously with carbon-potential control in the stove 1.0～1.2%, obtain the nitrided case that thickness is 0.5～15 μ m at last.
The application to the concrete technology that the FeAl intermetallic compound porous material carries out nitriding is: earlier the FeAl intermetallic compound porous material is placed the reactive atmosphere of nitriding; Be incubated 2～18h down at 550～750 ℃ then; Simultaneously with carbon-potential control in the stove 0.8～1.2%, obtain the nitrided case that thickness is 1～25 μ m at last.
Above-mentioned nitridation process to TiAl intermetallic compound porous material, NiAl intermetallic compound porous material, FeAl intermetallic compound porous material can access the nitrided case of thickness between 10-1 μ m～10 μ m orders of magnitude, thereby realizes the accurate control to nitriding depth.And, nitriding depth is maintained the non-corrosibility that this scope can obviously be improved material.
The application to the concrete technology that the TiAl intermetallic compound porous material carries out carbonitriding is: earlier the TiAl intermetallic compound porous material is placed the reactive atmosphere of carbonitriding; Be incubated 1～16h down at 800～1000 ℃ then; Simultaneously carbon potential in the stove and nitrogen gesture are controlled at 0.8～1.0%, obtain the carbonitrided case that thickness is 0.5～25 μ m at last.
The application to the concrete technology that the NiAl intermetallic compound porous material carries out carbonitriding is: earlier the NiAl intermetallic compound porous material is placed the reactive atmosphere of carbonitriding; Be incubated 2～18h down at 750～950 ℃ then; Simultaneously carbon potential in the stove and nitrogen gesture are controlled at 1.0～1.2%, obtain the carbonitrided case that thickness is 0.5～20 μ m at last.
The application to the concrete technology that the FeAl intermetallic compound porous material carries out carbonitriding is: earlier the FeAl intermetallic compound porous material is placed the reactive atmosphere of carbonitriding; Be incubated 2～10h down at 700～900 ℃ then; Simultaneously carbon potential in the stove and nitrogen gesture are controlled at 0.8～1.2%, obtain the carbonitrided case that thickness is 1～35 μ m at last.
Above-mentioned carbonitriding technology to TiAl intermetallic compound porous material, NiAl intermetallic compound porous material, FeAl intermetallic compound porous material can access the carbonitrided case of thickness between 10-1 μ m～10 μ m orders of magnitude, thereby realizes the accurate control to the carbonitriding layer thickness.And, the carbonitriding layer thickness is maintained non-corrosibility and the high-temperature oxidation resistance that this scope can obviously be improved material.
Further, the application can handle so that finally form the imparity that alloying layer thickness presents front and back through carry out antiseepage in the part of metal polyporous material.Term wherein " front and back " defines with the front and back of the hole at infiltration layer place; And the thickness that term " imparity " is interpreted as infiltration layer reduces along the hole direction in the past backward gradually.Thus; Metal polyporous material after thermo-chemical treatment promptly forms the structural form that is similar to " asymmetric membrane "; Hole on one side surface of metal polyporous material is less relatively because of the thicker aperture of alloying layer thickness, and the lip-deep hole of opposite side is relatively large because of the thin aperture of alloying layer thickness.When it is used to filter, just can utilizes the less relatively side in aperture to realize the separation of medium to be filtered, thereby both can improve the penetrating power of metal polyporous material, and can improve the backwash effect.
The aperture adjustment method of the metal polyporous material that more than is the application and is provided.In addition, the application also will provide a kind of pore structure of metal polyporous material, and this pore structure can make metal polyporous material meet the requirements of pore size.
For this reason, the pore structure of the application's metal polyporous material comprises the hole that is distributed in material surface, and the hole surface of described hole is provided with infiltration layer.Because the hole surface of metal polyporous material is provided with infiltration layer; This infiltration layer is in forming process, and the hole top layer of metal polyporous material lattice distortion takes place expands, or forms the cenotype layer in the internal skin, hole; Thereby the original hole on the metal polyporous material is dwindled, to reach the purpose of adjustment aperture.
Consider general filtering needs, the mean pore size of described hole is 0.05～100 μ m.
Further, said metal polyporous material is meant Al series intermetallic compound porous material.As preferably, said Al series intermetallic compound porous material is meant a kind of in TiAl intermetallic compound porous material, NiAl intermetallic compound porous material, the FeAl intermetallic compound porous material.
As preferably, said infiltration layer is a kind of in cementation zone, nitrided case, boride layer, sulphide layer, siliconising layer, aluminized coating, the chromising layer, or the co-penetration layer of the wherein several kinds of elements in above-mentioned these elements, such as carbonitrided case.
The pore structure of first kind of metal polyporous material that the application specifically provides is: this metal polyporous material is the TiAl intermetallic compound porous material, and its hole surface is provided with the thick cementation zone of 1～30 μ m.
The pore structure of second kind of metal polyporous material that the application specifically provides is: this metal polyporous material is the NiAl intermetallic compound porous material, and its hole surface is provided with the thick cementation zone of 0.5～25 μ m.
The pore structure of the third metal polyporous material that the application specifically provides is: this metal polyporous material is the FeAl intermetallic compound porous material, and its hole surface is provided with the thick cementation zone of 1～50 μ m.
The pore structure of the 4th kind of metal polyporous material that the application specifically provides is: this metal polyporous material is the TiAl intermetallic compound porous material, and its hole surface is provided with the nitrided case that thickness is 0.5～20 μ m.
The pore structure of the 5th kind of metal polyporous material that the application specifically provides is: this metal polyporous material is the NiAl intermetallic compound porous material, and its hole surface is provided with the nitrided case that thickness is 0.5～15 μ m.
The pore structure of the 6th kind of metal polyporous material that the application specifically provides is: this metal polyporous material is the FeAl intermetallic compound porous material, and its hole surface is provided with the nitrided case that thickness is 1～25 μ m.
The pore structure of the 7th kind of metal polyporous material that the application specifically provides is: this metal polyporous material is the TiAl intermetallic compound porous material, and its hole surface is provided with the carbonitrided case that thickness is 0.5～25 μ m.
The pore structure of the 8th kind of metal polyporous material that the application specifically provides is: this metal polyporous material is the NiAl intermetallic compound porous material, and its hole surface is provided with the carbonitrided case that thickness is 0.5～20 μ m.
The pore structure of the 9th kind of metal polyporous material that the application specifically provides is: this metal polyporous material is the FeAl intermetallic compound porous material, and its hole surface is provided with the carbonitrided case that thickness is 1～35 μ m.
Further, the thickness of said infiltration layer reduces along the hole direction in the past backward gradually.Thus; The application's metal polyporous material promptly forms the structural form that is similar to " asymmetric membrane "; Hole on one side surface of metal polyporous material is less relatively because of the thicker aperture of alloying layer thickness, and the lip-deep hole of opposite side is relatively large because of the thin aperture of alloying layer thickness.When it is used to filter, just can utilizes the less relatively side in aperture to realize the separation of medium to be filtered, thereby both can improve the penetrating power of metal polyporous material, and can improve the backwash effect.
To combine accompanying drawing and embodiment that the application is done further explanation below.Additional aspect of the application and advantage part in the following description provide, and part will become obviously from the following description, or recognize through the application's practice.
Description of drawings
Fig. 1 is the floor map of the pore structure of the application's metal polyporous material.
Fig. 2 be among Fig. 1 A-A to sectional view.
Fig. 3 be respectively with TiAl and NiAl material at the mean pore size change curve of carburizing under the differing temps after 6 hours.
Fig. 4 is incubated different time averaging of income varying aperture curve with the TiAl material down at 900 ℃.
Fig. 5 is incubated different time averaging of income varying aperture curve with the NiAl material down at 940 ℃.
Fig. 6 is the TiAl material after the nitriding and the corrosion-resistant kinetic curve of the TiAl material of nitriding not.
Be labeled as among the figure: hole 1, infiltration layer 2.
Embodiment
At first the application's aperture adjustment method is done further explanation below through following many group embodiment.
One, first group of embodiment
First group of embodiment carries out carburizing, nitriding, carbonitriding processing respectively to the titanium porous material.Before carrying out carburizing, nitriding and carbonitriding processing, the initial mean pore size of this material is 20 μ m, and initial porosity is 30%.Concrete processing parameter and mean pore size and the porosity after the thermo-chemical treatment of this group embodiment are as shown in table 1.
Table 1
Two, second group of embodiment
Second group of embodiment carries out carburizing treatment to the TiAl intermetallic compound porous material.Before carrying out carburizing treatment, the initial mean pore size of this material is 15 μ m, and initial porosity is 45%.Concrete processing parameter and mean pore size and the porosity after the thermo-chemical treatment of this group embodiment are as shown in table 2.
Table 2
Three, the 3rd group of embodiment
The 3rd group of embodiment carries out nitriding to the TiAl intermetallic compound porous material to be handled.Before carrying out the nitriding processing, the initial mean pore size of this material is 15 μ m, and initial porosity is 45%.Concrete processing parameter and mean pore size and the porosity after the thermo-chemical treatment of this group embodiment are as shown in table 3.
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Table 3
Four, the 4th group of embodiment
The 4th group of embodiment carries out carbonitriding to the TiAl intermetallic compound porous material to be handled.Before carrying out the carbonitriding processing, the initial mean pore size of this material is 15 μ m, and initial porosity is 45%.Concrete processing parameter and mean pore size and the porosity after the thermo-chemical treatment of this group embodiment are as shown in table 4.
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Table 4
Five, the 5th group of embodiment
The 5th group of embodiment carries out boronising to the TiAl intermetallic compound porous material to be handled.Before carrying out the boronising processing, the initial mean pore size of this material is 15 μ m, and initial porosity is 45%.Concrete processing parameter and mean pore size and the porosity after the thermo-chemical treatment of this group embodiment are as shown in table 5.
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Table 5
Six, the 6th group of embodiment
The 6th group of embodiment carries out carburizing treatment to the NiAl intermetallic compound porous material.Before carrying out carburizing treatment, the initial mean pore size of this material is 15 μ m, and initial porosity is 45%.Concrete processing parameter and mean pore size and the porosity after the thermo-chemical treatment of this group embodiment are as shown in table 6.
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Table 6
Seven, the 7th group of embodiment
The 7th group of embodiment carries out nitriding to the NiAl intermetallic compound porous material to be handled.Before carrying out the nitriding processing, the initial mean pore size of this material is 15 μ m, and initial porosity is 45%.Concrete processing parameter and mean pore size and the porosity after the thermo-chemical treatment of this group embodiment are as shown in table 7.
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Table 7
Eight, the 8th group of embodiment
The 8th group of embodiment carries out carbonitriding to the NiAl intermetallic compound porous material to be handled.Before carrying out the carbonitriding processing, the initial mean pore size of this material is 15 μ m, and initial porosity is 45%.Concrete processing parameter and mean pore size and the porosity after the thermo-chemical treatment of this group embodiment are as shown in table 8.
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Table 8
Nine, the 9th group of embodiment
The 9th group of embodiment carries out boronising to the NiAl intermetallic compound porous material to be handled.Before carrying out the boronising processing, the initial mean pore size of this material is 15 μ m, and initial porosity is 45%.Concrete processing parameter and mean pore size and the porosity after the thermo-chemical treatment of this group embodiment are as shown in table 9.
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Table 9
Ten, the tenth group of embodiment
The tenth group of embodiment carries out carburizing treatment to the FeAl intermetallic compound porous material.Before carrying out carburizing treatment, the initial mean pore size of this material is 15 μ m, and initial porosity is 45%.Concrete processing parameter and mean pore size and the porosity after the thermo-chemical treatment of this group embodiment are as shown in table 10.
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Table 10
11, the 11 groups of embodiment
The 7th group of embodiment carries out nitriding to the FeAl intermetallic compound porous material to be handled.Before carrying out the nitriding processing, the initial mean pore size of this material is 15 μ m, and initial porosity is 45%.Concrete processing parameter and mean pore size and the porosity after the thermo-chemical treatment of this group embodiment are as shown in table 11.
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Table 11
12, the 12 groups of embodiment
The 12 group of embodiment carries out carbonitriding to the FeAl intermetallic compound porous material to be handled.Before carrying out the carbonitriding processing, the initial mean pore size of this material is 15 μ m, and initial porosity is 45%.Concrete processing parameter and mean pore size and the porosity after the thermo-chemical treatment of this group embodiment are as shown in table 12.
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Table 12
According to above-mentioned 12 groups of embodiment, existing intercepting a part of data are wherein made like Fig. 3 to curve shown in Figure 5, so as to showing the influence to the aperture of thermo-chemical treatment temperature, time.Wherein, Fig. 3 be respectively with TiAl and NiAl material at the mean pore size change curve of carburizing under the differing temps after 6 hours.Fig. 4 is incubated different time averaging of income varying aperture curve with the TiAl material down at 900 ℃.Fig. 5 is incubated different time averaging of income varying aperture curve with the NiAl material down at 940 ℃.Can find that through Fig. 3 to Fig. 5 the thermo-chemical treatment temperature is high more, the reductions of mean pore size is big more; The thermo-chemical treatment time is long more, and the reductions of mean pore size is big more.In addition, because reductions and the alloying layer thickness of material mean pore size obviously is corresponding relation, therefore, above-mentionedly respectively organize the alloying layer thickness that embodiment has all only detected twice test from beginning to end.The alloying layer thickness of twice test of head and the tail changes from each group embodiment, also shows that alloying layer thickness is thick more, and the reductions of material mean pore size is big more.
Combine Fig. 1, Fig. 2 that the pore structure of the metal polyporous material that made by aforesaid method is specified below again.
As shown in Figure 1, the pore structure of metal polyporous material comprises the hole 1 that is distributed in material surface, and the hole surface of described hole 1 is provided with infiltration layer 2.Among Fig. 1, Fig. 2, dotted line representes to carry out the hole size before the thermo-chemical treatment, and the solid line in the dotted line then representes to carry out the hole size after the thermo-chemical treatment, is expressed as infiltration layer 2 in this solid line.Therefore, visible from Fig. 1,2 because the hole surface of hole 1 is provided with infiltration layer 2, this infiltration layer 2 in forming process, thereby because lattice distortion takes place in the hole top layer expands the original hole on the metal polyporous material is dwindled, to reach the purpose of adjustment aperture.Wherein, the mean pore size of described hole 1 is preferably 0.05～100 μ m.In addition, said metal polyporous material may be selected to be Al series intermetallic compound porous material, for example TiAl intermetallic compound porous material, FeAl intermetallic compound porous material or NiAl intermetallic compound porous material.In addition; Said infiltration layer 2 can be in cementation zone, nitrided case, boride layer, sulphide layer, siliconising layer, aluminized coating, the chromising layer a kind of; Or the co-penetration layer of the wherein several kinds of elements in above-mentioned these elements, like carbonitrided case, thus; The surface property that improves metal polyporous material can on the basis of adjustment aperture, be attached, like high temperature oxidation resistance, erosion resistance etc.
The application can carry out antiseepage to the part of metal polyporous material and handle when metal polyporous material carried out thermo-chemical treatment, such as; As shown in Figure 2, can on a of material face, b face and c face, apply permeability-reducing admixture respectively, like this; Element can only get into from the front end of hole 1 when carrying out thermo-chemical treatment, thus, and the imparity before and after the thickness of the infiltration layer 2 on the hole 1 will appear; The thickness that is infiltration layer 2 reduces along hole 1 direction in the past backward gradually, and at this moment, metal polyporous material promptly forms the structural form that is similar to " asymmetric membrane "; Hole 1 on one side surface of metal polyporous material is less relatively because of the thicker aperture of infiltration layer 2 thickness; And the lip-deep hole of opposite side is relatively large because of thin (or not having infiltration layer) aperture of alloying layer thickness, when it is used to filter, just can utilize the less relatively side in aperture to realize the separation of medium to be filtered; Thereby both can improve the penetrating power of metal polyporous material, and can improve the backwash effect.
Show the change of performance below through evidence material after thermo-chemical treatment.
1, down carries out 900 ℃, the high-temperature oxidation test of 48h with above-mentioned at 900 ℃, then sample is carried out backscattered electron image photo and carbon line wavelet spectrum analysis through the TiAl intermetallic compound porous material samples of 6h carburizing treatment.The result finds that the textura epidermoidea of material hole has similar structure with the preceding textura epidermoidea of test after the oxidation test, is exposed in high temperature atmosphere even this shows, cementation zone still demonstrates good thermostability and resistance of oxidation.
2, will carry out corrosion test in the hydrochloric acid soln at PH=3 respectively through the TiAl intermetallic compound porous material sample of 12h nitriding processing and the TiAl intermetallic compound porous material sample of not handling through nitriding down at 900 ℃, its result is as shown in Figure 6: the TiAl material through the nitriding processing is significantly less than the TiAl material of not handling through nitriding with etching time increase mass loss.
Claims (8)
1. the pore structure that contains the metal polyporous material of nitrided case comprises the hole (1) that is distributed in material surface, and it is characterized in that: the hole surface of described hole (1) is provided with infiltration layer (2), and this infiltration layer (2) is a nitrided case.
2. the pore structure of metal polyporous material as claimed in claim 1, it is characterized in that: the mean pore size of described hole (1) is 0.05～100 μ m.
3. the pore structure of metal polyporous material as claimed in claim 1, it is characterized in that: said metal polyporous material is an Al series intermetallic compound porous material.
4. the pore structure of metal polyporous material as claimed in claim 3 is characterized in that: said Al series intermetallic compound porous material is meant a kind of in TiAl intermetallic compound porous material, FeAl intermetallic compound porous material, the NiAl intermetallic compound porous material.
5. the pore structure of metal polyporous material as claimed in claim 4, it is characterized in that: this metal polyporous material is the TiAl intermetallic compound porous material, its hole surface is provided with the nitrided case that thickness is 0.5～20 μ m.
6. the pore structure of metal polyporous material as claimed in claim 4, it is characterized in that: this metal polyporous material is the NiAl intermetallic compound porous material, its hole surface is provided with the nitrided case that thickness is 0.5～15 μ m.
7. the pore structure of metal polyporous material as claimed in claim 4, it is characterized in that: this metal polyporous material is the FeAl intermetallic compound porous material, its hole surface is provided with the nitrided case that thickness is 1～25 μ m.
8. like the pore structure of any described metal polyporous material of claim in the claim 1 to 7, the thickness of said infiltration layer (2) reduces along hole (1) direction in the past backward gradually.
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| CN 201120559750 CN202482411U (en) | 2011-12-28 | 2011-12-28 | Pore structure of metal cellular material containing nitriding layers |
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