CN103060747A - Method for preparing Y modified CoAlNi coating on Ni-based high temperature alloy by embedding infiltration process - Google Patents
Method for preparing Y modified CoAlNi coating on Ni-based high temperature alloy by embedding infiltration process Download PDFInfo
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Abstract
The invention discloses a method for preparing a Y modified CoAlNi coating on an Ni-based high temperature alloy by an embedding infiltration process. The thickness of the CoAlNiY coating is between 10 and 30 mu m. The CoAlNiY coating only comprises an Al0.9 Ni1.1 phase, wherein partial Ni atoms are replaced by Co atoms, and Y atoms exist in the Al0.9 Ni1.1 phase in the form of placeholder solid solution. Continuous and dense Al2O3 oxide layers can be formed on the prepared CoAlNiY coating C when the CoAlNiY coating is subjected to high-temperature cycle oxidation at the temperature of 1,050 DEG, so that the coating and a substrate can be prevented from being further oxidized, and the high-temperature cycle oxidation resistance of the substrate is improved. The CoAlNiY coating has higher thermal corrosion resistance at the high temperature of between 850 and 950 DEG C.
Description
Technical field
The present invention relates to a kind of high temperature coating, more particularly, refer to a kind of method that adopts pack cementation technique to prepare Y modification CoAlNi coating at the Ni based high-temperature alloy.
Background technology
Nickel base superalloy at high temperature has the performances such as higher physical strength and creep resistance usually, and this is so that it is widely used in the hot-end components such as aero-jet engine, various industrial gas turbines, such as engine blade.But usually can reduce the performances such as anti-oxidant and corrosion and heat resistant of superalloy in order to improve element that alloy high-temp intensity adds.The effective measure that address this problem are to prepare high-temperature protection coating at alloy surface, many scientific research personnel have done a large amount of research, such as the alloy surface aluminising, aluminising silicon, chromising silicon, aluminising hafniums etc., result of study show, these coatings can more effectively be improved Alloy Anti oxidation and hot corrosion resistance.In order further to carry heavy alloyed high temperature resistance cyclic oxidation and hot corrosion resistance, the CoAlNiY coating is the potential new coating of a kind of tool.
Summary of the invention
The objective of the invention is to propose a kind of method that adopts the pack cementation method to prepare Y modification CoAlNi coating at the Ni based high-temperature alloy, by at high temperature producing the active atomic of Co, Al and Y, make the active atomic of Co, Al and Y be diffused into matrix inside, thereby generate coating.Have diffusion layer between coatingsurface and the matrix.The described CoAlNiY coat-thickness that makes is 10 μ m～30 μ m, and the CoAlNiY coating only has Al
0.9Ni
1.1Phase, wherein part Ni atom is substituted by the Co atom, and the Y atom is present in Al with the form of occupy-place solid solution
0.9Ni
1.1Mutually.
The present invention is a kind of method that adopts pack cementation technique to prepare Y modification CoAlNi coating at the Ni based high-temperature alloy, and it includes the following step:
The first step: the pre-treatment of matrix
(A) the SiC silicon carbide paper with 800# carries out the surface grinding processing with the Ni based high-temperature alloy, makes the first sample;
(B) the first sample put into dehydrated alcohol carry out ultrasonic cleaning 10～15min after, obtain the second sample;
Second step: embedding bleed processed
100g embedding bleed processed is that 100 purpose Al powder, 15～25g granularity are that 100 purpose Co powder, 1～3g granularity are 100 purpose Y by 6～8g granularity
2O
3Powder, 3～5g granularity are that 100 purpose NH4Cl powder, 3～5g granularity are 100 purpose NH
4I powder and surplus granularity are 100 purpose Al
2O
3Powder forms;
The 3rd step: adopt pack cementation technique to prepare Y modification CoAlNi coating
(A) the embedding bleed that second step is made is put into crucible bottom, then the second sample after processing in the first step is put into the crucible middle part, and fill up the embedding bleed of surplus around it, after covering crucible lid and sealing, form heat treated sample, and heat treated sample is inserted in the resistance furnace;
(B) temperature rise rate that resistance furnace is set is 3～7 ℃/min, 1000 ℃～1100 ℃ of pack cementation temperature, pack cementation time 5～12h;
(C) the opening resistor stove passes into argon gas; The mass percent purity of described argon gas is 99.0%, flow 60ml/min～150ml/min;
(D) when the pack cementation time finishes, close resistance furnace, when being cooled to 100 ℃ with resistance furnace, stop to pass into argon gas; Open fire door and take out sample, namely make the 3rd sample;
(E) the 3rd sample is put into alcohol through ultrasonic cleaning after 10～20 minutes, cold wind dries up, and obtains the CoAlNiY coating that is impregnated with on Ni based high-temperature alloy surface.
Adopt the advantage of the CoAlNiY coating that pack cementation technique of the present invention makes to be:
1. utilize the hot chemical treatment method of pack cementation technique, so that the embedding bleed at the active atomic that produces Co, Al and Y, makes the active atomic of Co, Al and Y be diffused into matrix inside, thereby generate coating.Have diffusion layer between coatingsurface and the matrix.
2. utilizing the thermal resistance stove to carry out the CoAlNiY coat-thickness that thermo-chemical treatment makes is 10 μ m～30 μ m, and the CoAlNiY coating only has Al
0.9Ni
1.1Phase, wherein part Ni atom is substituted by the Co atom, and the Y atom is present in Al with the form of occupy-place solid solution
0.9Ni
1.1Mutually.Technique is controlled, production cost is low.
3. the CoAlNiY coating that makes can form continuous, fine and close Al when 1050 ℃ of cyclic oxidations of high temperature
2O
3Oxide skin, thus the further oxidized of coatings and substrate stoped, improved the high temperature resistance cyclic oxidation performance of Ni based high-temperature alloy matrix.
4. the CoAlNiY coating of preparation is carried out the high temperature corrosion test in the etching reagent that the sodium-chlor of 75% sodium sulfate and 25% forms: under the condition of 900 ℃～950 ℃ of temperature, corrode after 100～200 hours, observe sample, its surfacing, nothing are peeled off, and illustrate that the CoAlNiY coating has good hot corrosion resistance.
Description of drawings
Fig. 1 adopts the inventive method at the schematic diagram of matrix CoAlNiY coating processed.
Fig. 2 is the SEM photo of the CoAlNiY coating that makes of embodiment 1.
Fig. 3 is the XRD figure of the CoAlNiY coating that makes of embodiment 1.
Fig. 4 is that the 3rd sample and DZ125 alloy carry out cyclic oxidation weightening finish curve.
Fig. 5 is the SEM photo behind the CoAlNiY coating cyclic oxidation that makes of embodiment 1.
Fig. 6 is the XRD figure behind the CoAlNiY coating cyclic oxidation that makes of embodiment 1.
Embodiment
The present invention is described in further detail below in conjunction with drawings and Examples.
CoAlNiY coating of the present invention only has Al
0.9Ni
1.1Phase, wherein part Ni atom is substituted by the Co atom, and the Y atom is present in Al with the form of occupy-place solid solution
0.9Ni
1.1Mutually.Made CoAlNiY coat-thickness is 10 μ m～30 μ m.
The present invention is a kind of method that adopts pack cementation technique to prepare Y modification CoAlNi coating at the Ni based high-temperature alloy, and this coating production has the following step:
The first step: the pre-treatment of matrix
(A) the SiC silicon carbide paper with 800# carries out the surface grinding processing with the Ni based high-temperature alloy, makes the first sample;
The surfaceness of the first sample is Ra=1.6;
(B) the first sample put into dehydrated alcohol carry out ultrasonic cleaning 10～15min after, obtain the second sample;
Second step: embedding bleed processed
100g embedding bleed processed is that 100 purpose Al powder, 15～25g granularity are that 100 purpose Co powder, 1～3g granularity are 100 purpose Y by 6～8g granularity
2O
3Powder, 3～5g granularity are 100 purpose NH
4Cl powder, 3～5g granularity are 100 purpose NH
4I powder and surplus granularity are 100 purpose Al
2O
3Powder forms;
In the present invention, the Al of adding
2O
3Powder does not participate in reaction in the pack cementation process, only as filler.This filler can reduce production costs on the basis that does not affect coating formation effectively, has also reduced the waste of reactant simultaneously.
In the present invention, add NH
4Cl powder and NH
4The I powder can with Al powder, Co powder and Y
2O
3The powder reaction forms corresponding gaseous compound, only has this compound just can produce the active atomic of Al, Co and Y, penetrates into Ni based high-temperature alloy surface.
The 3rd step: adopt pack cementation technique to prepare the CoAlNiY coating
(A) the embedding bleed that second step is made is put into crucible bottom, then the second sample after processing in the first step is put into the crucible middle part, and fill up the embedding bleed of surplus around it, after covering crucible lid and sealing, form heat treated sample, and heat treated sample is inserted in the resistance furnace;
(B) temperature rise rate that resistance furnace is set is 3～7 ℃/min, 1000 ℃～1100 ℃ of pack cementation temperature, pack cementation time 5～12h;
(C) the opening resistor stove passes into argon gas; The mass percent purity of described argon gas is 99.0%, flow 60ml/min～150ml/min; CoAlNiY coating processed under argon shield;
(D) when the pack cementation time finishes, close resistance furnace, when being cooled to 100 ℃ with resistance furnace, stop to pass into argon gas; Open fire door and take out sample, namely make the 3rd sample;
(E) the 3rd sample is put into alcohol through ultrasonic cleaning after 10～20 minutes, cold wind dries up, and obtains the CoAlNiY coating that is impregnated with on Ni based high-temperature alloy surface.
The CoAlNiY coating of aforesaid method preparation is carried out composition and facies analysis through SEM and XRD.Its structure is diffusion layer on the matrix referring to shown in Figure 1, and outermost is the CoAlNiY coating.
Embodiment 1:
Matrix is selected Ni-6.2Co-8.9Cr-7.0W-6.1Al-3.8Ta-2.0Mo-1.5Hf-1.0Ti(trade mark DZ125).
The first step: the pre-treatment of matrix
(A) the SiC silicon carbide paper with 800# carries out the surface grinding processing with the Ni based high-temperature alloy, makes the first sample;
The surfaceness of the first sample is Ra=1.6;
(B) the first sample put into dehydrated alcohol carry out ultrasonic cleaning 10～15min after, obtain the second sample;
Second step: embedding bleed processed
100g embedding bleed processed is that 100 purpose Al powder, 20g granularity are that 100 purpose Co powder, 2g granularity are 100 purpose Y by the 7.6g granularity
2O
3Powder, 4g granularity are 100 purpose NH
4Cl powder, 4g granularity are 100 purpose NH
4I powder and surplus granularity are 100 purpose Al
2O
3Powder forms;
In the present invention, the Al of adding
2O
3Powder does not participate in reaction in the pack cementation process, only as filler.This filler can reduce production costs on the basis that does not affect coating formation effectively, has also reduced the waste of reactant simultaneously.
In the present invention, add NH
4Cl and NH
4The I powder can with Al powder, Co powder and Y
2O
3The powder reaction forms corresponding gaseous compound, only has this compound just can produce the active atomic of Al, Co and Y, penetrates into Ni based high-temperature alloy surface.
The 3rd step: adopt pack cementation technique to prepare the CoAlNiY coating
(A) the embedding bleed that second step is made is put into crucible bottom, then the second sample after processing in the first step is put into the crucible middle part, and fill up the embedding bleed of surplus around it, after covering crucible lid and sealing, form heat treated sample, and heat treated sample is inserted in the resistance furnace;
(B) temperature rise rate that resistance furnace is set is 5 ℃/min, 1050 ℃ of pack cementation temperature, pack cementation time 10h;
(C) the opening resistor stove passes into argon gas; The mass percent purity of described argon gas is 99.0%, flow 100ml/min; CoAlNiY coating processed under argon shield;
(D) when the pack cementation time finishes, close resistance furnace, when being cooled to 100 ℃ with resistance furnace, stop to pass into argon gas; Open fire door and take out sample, namely make the 3rd sample;
(E) the 3rd sample is put into alcohol through ultrasonic cleaning after 15 minutes, cold wind dries up, and obtains the CoAlNiY coating that is impregnated with on Ni based high-temperature alloy surface.
With the CoAlNiY coating of embodiment 1 preparation through SEM(such as Fig. 2) and XRD(such as Fig. 3) the analysis showed that, the CoAlNiY coating only has Al
0.9Ni
1.1Phase, wherein part Ni atom is substituted by the Co atom, and the Y atom is present in Al with the form of occupy-place solid solution
0.9Ni
1.1Mutually.Find by power spectrum, the composition of diffusion layer is 13Al-20Co-46.4Ni-3Mo-8.5Cr-8W-1.1Y, and thickness is about 16.7 μ m.In Fig. 2, can observe matrix has diffusion layer and CoAlNiY coating after pack cementation is processed structure.Can find out that in Fig. 3 the CoAlNiY coating only has Al
0.9Ni
1.1Phase, wherein part Ni atom is substituted by the Co atom, and the Y atom is present in Al with the form of occupy-place solid solution
0.9Ni
1.1Mutually.
Because the CoAlNiY coating will be worked under the conditions such as Thermal cycle oxidation and thermal etching, these all might cause coating to lose efficacy.Therefore, the purpose of Thermal cycle oxidation experiment is reaction kinetics and the oxidation mechanism of research metal or alloy under the cyclic oxidation reaction conditions.Wherein the simplest method is that the sample of a known quality and surface-area is placed on oxidation certain hour in the process furnace, to carry out weighing after its taking-up and the cooling, then again put into process furnace oxidation certain hour, to again carry out weighing after its taking-up and the cooling, so repeatedly, variation can be determined degree of oxidation according to sample mass.The pattern of specimen surface oxide film, structure and composition can carry out observation and analysis with various X-rays and Metallographic Techniques.
In the present invention, the Thermal cycle oxidation test temperature is 1050 ℃, place high temperature process furnances to carry out the Thermal cycle oxidation processing on the 3rd sample of aforesaid method preparation, Fig. 4 is that the 3rd sample and DZ125 alloy carry out cyclic oxidation weightening finish curve, as can be seen from the figure with respect to the DZ125 alloy substrate, the 3rd sample has better high temperature resistance cyclic oxidation performance.Measure the sample mass variation behind the cyclic oxidation and adopt XRD, SEM observation and analysis composition.
Coatingsurface behind the cyclic oxidation is through SEM(such as Fig. 5) and XRD(such as Fig. 6) the analysis showed that coatingsurface has formed the Al of continuous densification
2O
3Oxide skin, thus effectively stoped in the cyclic oxidation process oxygen to the diffusion of matrix.In Fig. 5, can observe at the CoAlNiY coatingsurface and form the continuously oxide skin of densification of one deck.This oxide skin is learnt by XRD analysis and is Al
2O
3Oxide compound, as shown in Figure 6.
The CoAlNiY coating of embodiment 1 preparation is carried out the high temperature corrosion test in the etching reagent that the sodium-chlor of 75% sodium sulfate and 25% forms: under the condition of 900 ℃ of temperature, corrode after 200 hours, observe sample, its surfacing, nothing are peeled off, and illustrate that the CoAlNiY coating through pack cementation method preparation of the present invention has good hot corrosion resistance.
Embodiment 2:
Matrix is selected Ni-10Co-9Cr-12W-5Al-1.5Hf-2Ti(trade mark DZ22).
The first step: the pre-treatment of matrix
(A) the SiC silicon carbide paper with 800# carries out the surface grinding processing with the Ni based high-temperature alloy, makes the first sample;
The surfaceness of the first sample is Ra=1.6;
(B) the first sample put into dehydrated alcohol carry out ultrasonic cleaning 10～15min after, obtain the second sample;
Second step: embedding bleed processed
100g embedding bleed processed is that 100 purpose Al powder, 15g granularity are that 100 purpose Co powder, 3g granularity are 100 purpose Y by the 6g granularity
2O
3Powder, 5g granularity are 100 purpose NH
4Cl powder, 5g granularity are 100 purpose NH
4I powder and surplus granularity are 100 purpose Al
2O
3Powder forms;
In the present invention, the Al of adding
2O
3Powder does not participate in reaction in the pack cementation process, only as filler.This filler can reduce production costs on the basis that does not affect coating formation effectively, has also reduced the waste of reactant simultaneously.
In the present invention, add NH
4Cl powder and NH
4The I powder can with Al powder, Co powder and Y
2O
3The powder reaction forms corresponding gaseous compound, only has this compound just can produce the active atomic of Al, Co and Y, penetrates into Ni based high-temperature alloy surface.
The 3rd step: adopt pack cementation technique to prepare the CoAlNiY coating
(A) the embedding bleed that second step is made is put into crucible bottom, then the second sample after processing in the first step is put into the crucible middle part, and fill up the embedding bleed of surplus around it, after covering crucible lid and sealing, form heat treated sample, and heat treated sample is inserted in the resistance furnace;
(B) temperature rise rate that resistance furnace is set is 7 ℃/min, 1000 ℃ of pack cementation temperature, pack cementation time 12h
(C) the opening resistor stove passes into argon gas; The mass percent purity of described argon gas is 99.0%, flow 80ml/min; CoAlNiY coating processed under argon shield;
(D) when the pack cementation time finishes, close resistance furnace, when being cooled to 100 ℃ with resistance furnace, stop to pass into argon gas; Open fire door and take out sample, namely make the 3rd sample;
(E) the 3rd sample is put into alcohol through ultrasonic cleaning after 10 minutes, cold wind dries up, and obtains the CoAlNiY coating that is impregnated with on Ni based high-temperature alloy surface.
The CoAlNiY coating of embodiment 2 preparations is shown through SEM and XRD analysis, and the CoAlNiY coating only has Al
0.9Ni
1.1Phase, wherein part Ni atom is substituted by the Co atom, and the Y atom is present in Al with the form of occupy-place solid solution
0.9Ni
1.1Mutually.Find by power spectrum, the composition of diffusion layer is 24Al-14Co-28Ni-7Cr-25W-2Y, and thickness is about 17.1 μ m.
The CoAlNiY coating of embodiment 2 preparation is carried out the high temperature corrosion test in the etching reagent that the sodium-chlor of 75% sodium sulfate and 25% forms: under the condition of 950 ℃ of temperature, corrode after 100 hours, observe sample, its surfacing, nothing are peeled off, and illustrate that the CoAlNiY coating through pack cementation method preparation of the present invention has good hot corrosion resistance.
Embodiment 3:
Matrix is selected Ni-5Co-11Cr-5W-5.5Al-4.1Mo-2.5Ti(trade mark K403).
The first step: the pre-treatment of matrix
(A) the SiC silicon carbide paper with 800# carries out the surface grinding processing with the Ni based high-temperature alloy, makes the first sample;
The surfaceness of the first sample is Ra=1.6;
(B) the first sample put into dehydrated alcohol carry out ultrasonic cleaning 10～15min after, obtain the second sample;
Second step: embedding bleed processed
100g embedding bleed processed is that 100 purpose Al powder, 25g granularity are that 100 purpose Co powder, 1g granularity are 100 purpose Y by the 8g granularity
2O
3Powder, 3g granularity are 100 purpose NH
4Cl powder, 3g granularity are 100 purpose NH
4I powder and surplus granularity are 100 purpose Al
2O
3Powder forms;
In the present invention, the Al of adding
2O
3Powder does not participate in reaction in the pack cementation process, only as filler.This filler can reduce production costs on the basis that does not affect coating formation effectively, has also reduced the waste of reactant simultaneously.
In the present invention, add NH
4Cl powder and NH
4The I powder can with Al powder, Co powder and Y
2O
3The powder reaction forms corresponding gaseous compound, only has this compound just can produce the active atomic of Al, Co and Y, penetrates into Ni based high-temperature alloy surface.
The 3rd step: adopt pack cementation technique to prepare the CoAlNiY coating
(A) the embedding bleed that second step is made is put into crucible bottom, then the second sample after processing in the first step is put into the crucible middle part, and fill up the embedding bleed of surplus around it, after covering crucible lid and sealing, form heat treated sample, and heat treated sample is inserted in the resistance furnace;
(B) temperature rise rate that resistance furnace is set is 4 ℃/min, 1100 ℃ of pack cementation temperature, pack cementation time 8h;
(C) the opening resistor stove passes into argon gas; The mass percent purity of described argon gas is 99.0%, flow 60ml/min; CoAlNiY coating processed under argon shield;
(D) when the pack cementation time finishes, close resistance furnace, when being cooled to 100 ℃ with resistance furnace, stop to pass into argon gas; Open fire door and take out sample, namely make the 3rd sample;
(E) the 3rd sample is put into alcohol through ultrasonic cleaning after 15 minutes, cold wind dries up, and obtains the CoAlNiY coating that is impregnated with on Ni based high-temperature alloy surface.
The CoAlNiY coating of embodiment 3 preparations is shown through SEM and XRD analysis, and the CoAlNiY coating only has Al
0.9Ni
1.1Phase, wherein part Ni atom is substituted by the Co atom, and the Y atom is present in Al with the form of occupy-place solid solution
0.9Ni
1.1Mutually.Find by power spectrum, the composition of diffusion layer is 25.3Al-10Co-37.5Ni-3.5Mo-7Cr-16W-0.7Y, and thickness is about 16.4 μ m.
The CoAlNiY coating of embodiment 3 preparation is carried out the high temperature corrosion test in the etching reagent that the sodium-chlor of 75% sodium sulfate and 25% forms: under the condition of 900 ℃ of temperature, corrode after 200 hours, observe sample, its surfacing, nothing are peeled off, and illustrate that the CoAlNiY coating through pack cementation method preparation of the present invention has good hot corrosion resistance.
Embodiment 4:
Matrix is selected Ni-15Co-9Cr-5.3Al-3Mo-1.8Hf-4.8Ti(trade mark K417).
The first step: the pre-treatment of matrix
(A) the SiC silicon carbide paper with 800# carries out the surface grinding processing with the Ni based high-temperature alloy, makes the first sample;
The surfaceness of the first sample is Ra=1.6;
(B) the first sample put into dehydrated alcohol carry out ultrasonic cleaning 10～15min after, obtain the second sample;
Second step: embedding bleed processed
100g embedding bleed processed is that 100 purpose Al powder, 20g granularity are that 100 purpose Co powder, 2g granularity are 100 purpose Y by the 7g granularity
2O
3Powder, 5g granularity are 100 purpose NH
4Cl powder, 5g granularity are 100 purpose NH
4I powder and surplus granularity are 100 purpose Al
2O
3Powder forms;
In the present invention, the Al of adding
2O
3Powder does not participate in reaction in the pack cementation process, only as filler.This filler can reduce production costs on the basis that does not affect coating formation effectively, has also reduced the waste of reactant simultaneously.
In the present invention, add NH
4Cl powder and NH
4The I powder can with Al powder, Co powder and Y
2O
3The powder reaction forms corresponding gaseous compound, only has this compound just can produce the active atomic of Al, Co and Y, penetrates into Ni based high-temperature alloy surface.
The 3rd step: adopt pack cementation technique to prepare the CoAlNiY coating
(A) the embedding bleed that second step is made is put into crucible bottom, then the second sample after processing in the first step is put into the crucible middle part, and fill up the embedding bleed of surplus around it, after covering crucible lid and sealing, form heat treated sample, and heat treated sample is inserted in the resistance furnace;
(B) temperature rise rate that resistance furnace is set is 6 ℃/min, 1050 ℃ of pack cementation temperature, pack cementation time 10h;
(C) the opening resistor stove passes into argon gas; The mass percent purity of described argon gas is 99.0%, flow 120ml/min; CoAlNiY coating processed under argon shield;
(D) when the pack cementation time finishes, close resistance furnace, when being cooled to 100 ℃ with resistance furnace, stop to pass into argon gas; Open fire door and take out sample, namely make the 3rd sample;
(E) the 3rd sample is put into alcohol through ultrasonic cleaning after 20 minutes, cold wind dries up, and obtains the CoAlNiY coating that is impregnated with on Ni based high-temperature alloy surface.
The CoAlNiY coating of embodiment 4 preparations is shown through SEM and XRD analysis, and the CoAlNiY coating only has Al
0.9Ni
1.1Phase, wherein part Ni atom is substituted by the Co atom, and the Y atom is present in Al with the form of occupy-place solid solution
0.9Ni
1.1Mutually.Find by power spectrum, the composition of diffusion layer is 25Al-12Co-47.3Ni-8Mo-6.5Cr-1.2Y, and thickness is about 17.5 μ m.
The CoAlNiY coating of embodiment 4 preparation is carried out the high temperature corrosion test in the etching reagent that the sodium-chlor of 75% sodium sulfate and 25% forms: under the condition of 900 ℃ of temperature, corrode after 150 hours, observe sample, its surfacing, nothing are peeled off, and illustrate that the CoAlNiY coating through pack cementation method preparation of the present invention has good hot corrosion resistance.
The CoAlNiY coating that adopts the inventive method to make can be formed continuous, fine and close Al when 1050 ℃ of cyclic oxidations of high temperature
2O
3Oxide skin, thus the further oxidized of coatings and substrate stoped, improved the high temperature resistance cyclic oxidation performance of Ni based high-temperature alloy matrix.Because the CoAlNiY coating layer portion Ni atom that makes is substituted by the Co atom, thus this coating at high temperature (900 ℃～950 ℃) also have good hot corrosion resistance.
Claims (6)
1. method that adopts pack cementation technique to prepare Y modification CoAlNi coating at the Ni based high-temperature alloy is characterized in that including the following step:
The first step: the pre-treatment of matrix
(A) the SiC silicon carbide paper with 800# carries out the surface grinding processing with the Ni based high-temperature alloy, makes the first sample;
(B) the first sample put into dehydrated alcohol carry out ultrasonic cleaning 10～15min after, obtain the second sample;
Second step: embedding bleed processed
100g embedding bleed processed is that 100 purpose Al powder, 15～25g granularity are that 100 purpose Co powder, 1～3g granularity are 100 purpose Y by 6～8g granularity
2O
3Powder, 3～5g granularity are 100 purpose NH
4Cl powder, 3～5g granularity are 100 purpose NH
4I powder and surplus granularity are 100 purpose Al
2O
3Powder forms;
The 3rd step: adopt pack cementation technique to prepare Y modification CoAlNi coating
(A) the embedding bleed that second step is made is put into crucible bottom, then the second sample after processing in the first step is put into the crucible middle part, and fill up the embedding bleed of surplus around it, after covering crucible lid and sealing, form heat treated sample, and heat treated sample is inserted in the resistance furnace;
(B) temperature rise rate that resistance furnace is set is 3～7 ℃/min, 1000 ℃～1100 ℃ of pack cementation temperature, pack cementation time 5～12h;
(C) the opening resistor stove passes into argon gas; The mass percent purity of described argon gas is 99.0%, flow 60ml/min～150ml/min;
(D) when the pack cementation time finishes, close resistance furnace, when being cooled to 100 ℃ with resistance furnace, stop to pass into argon gas; Open fire door and take out sample, namely make the 3rd sample;
(E) the 3rd sample is put into alcohol through ultrasonic cleaning after 10～20 minutes, cold wind dries up, and obtains the CoAlNiY coating that is impregnated with on Ni based high-temperature alloy surface.
2. employing pack cementation technique according to claim 1 prepares the method for Y modification CoAlNi coating at the Ni based high-temperature alloy, it is characterized in that: the CoAlNiY coating that makes only has Al
0.9Ni
1.1Phase.
3. employing pack cementation technique according to claim 1 prepares the method for Y modification CoAlNi coating at the Ni based high-temperature alloy, it is characterized in that: the CoAlNiY coat-thickness that makes is 10 μ m～30 μ m.
4. employing pack cementation technique according to claim 1 prepares the method for Y modification CoAlNi coating at the Ni based high-temperature alloy, it is characterized in that: the CoAlNiY coating that makes can form continuous, fine and close Al2O3 oxide skin when 1050 ℃ of cyclic oxidations of high temperature.
5. employing pack cementation technique according to claim 1 prepares the method for Y modification CoAlNi coating at the Ni based high-temperature alloy, it is characterized in that: the CoAlNiY coating that makes is carried out the high temperature corrosion test in the etching reagent that the sodium-chlor of 75% sodium sulfate and 25% forms: under the condition of 900 ℃～950 ℃ of temperature, corrode after 100～200 hours, observe sample, its surfacing, nothing are peeled off.
6. employing pack cementation technique according to claim 1 prepares the method for Y modification CoAlNi coating at the Ni based high-temperature alloy, it is characterized in that: what prepare is Y modification CoAlNi coating.
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| CN201210540509.6A CN103060747B (en) | 2012-12-13 | 2012-12-13 | Method for preparing Y modified CoAlNi coating on Ni-based high temperature alloy by embedding infiltration process |
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| CN104120426A (en) * | 2014-07-25 | 2014-10-29 | 北京航空航天大学 | Mo-Si-B coating on niobium-based alloy and preparation method of Mo-Si-B coating |
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| CN105839048A (en) * | 2016-04-08 | 2016-08-10 | 北方民族大学 | High-temperature alloy oxidation-resistance and corrosion-resistant protective coating |
| CN106048488A (en) * | 2016-06-21 | 2016-10-26 | 西安理工大学 | Method of preparing high-temperature oxidation-resistant coating on surface of refractory metal material |
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| CN104120426A (en) * | 2014-07-25 | 2014-10-29 | 北京航空航天大学 | Mo-Si-B coating on niobium-based alloy and preparation method of Mo-Si-B coating |
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| CN105839048A (en) * | 2016-04-08 | 2016-08-10 | 北方民族大学 | High-temperature alloy oxidation-resistance and corrosion-resistant protective coating |
| CN105839048B (en) * | 2016-04-08 | 2018-06-19 | 北方民族大学 | A kind of high temperature alloy oxidation and corrosion protective coating and penetration enhancer |
| CN106048488A (en) * | 2016-06-21 | 2016-10-26 | 西安理工大学 | Method of preparing high-temperature oxidation-resistant coating on surface of refractory metal material |
| CN106048488B (en) * | 2016-06-21 | 2019-05-24 | 西安理工大学 | A method of high-temperature oxidation resistant coating is prepared on refractory metal material surface |
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