A high-permeability composite penetrant for ultra-large racks in the marine environment and a controllable ion infiltration process

Abstract

The present invention discloses a highly permeable composite penetrant for ultra-large racks in marine environment and a controllable ion penetration process. The penetrant comprises the following components in percentage by weight: KOCN 25-30%, NaHCO3 20-25%, Sr(OH)2 2-5%, NaCl 10-15%, K2O 10-15%, KH2PO4 2-5%, Li2B4O7 5-10%, Ce(NO3)3·6H2O 1-2%, ErCl3•6H2O 2-3%, YCl3 0.05-0.1%, complexing agent 1-2%, accelerator 0.5-1%. The present invention innovatively adopts a highly permeable composite penetrant added with a complexing agent and an accelerator, and obtains a carbonitrided yttrium-oxygen multi-element composite penetration layer with a compound layer depth of more than 30μm and a surface hardness of HV 0.1 above 850 on an ultra-large 40CrNi2Mo rack.

Description

Technical Field

[0001] The present invention relates to surface engineering, and particularly to a highly permeable composite penetrant for a load-bearing moving friction member (ultra-large rack) in a marine environment and a controllable ion infiltration process for wear and corrosion protection treatment. Background Art

[0002] XXX radar is a key large-scale electronic device installed on a certain measurement ship, which undertakes the important mission of space target surveillance. The servo drive system is one of the key subsystems of XXX radar, which is related to whether the radar can capture space targets in time and accurately and stably track and measure them. Among them, the pitch rack is a key component of the servo drive system, and its material is 40CrNi 2 Mo alloy steel, with an ultra-large external dimension (nearly a semi-circular arc with a diameter of about 9m and an arc length of about 13m) and high dimensional accuracy. This rack bears the pitch drive of the radar antenna array, with a maximum contact stress exceeding 500 MPa and high surface wear resistance requirements. In addition, the service environment of this measurement ship is the global sea area, facing the long-term erosion of high temperature, high humidity, and high salt fog in the harsh marine environment, and high surface protection performance requirements.

[0003] At present, various conventional surface protective layers, such as plating layers, organic coatings, spray coatings, conversion films, etc., will have the problem of protective layer peeling or wear under heavy load moving friction conditions, losing the protection effect on the substrate. Therefore, the problems of wear resistance and corrosion resistance of the ultra-large rack of XXX radar in the marine environment have become new problems that need to be solved urgently in the field of surface engineering. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a highly permeable composite penetrant for an ultra-large rack in a marine environment and a controllable ion infiltration process, which can effectively improve the wear resistance and corrosion resistance of the ultra-large rack.

[0005] To achieve the above purpose, one of the technical solutions of the present invention is:

[0006] A highly permeable composite penetrant for an ultra-large rack in a marine environment, comprising the following components in weight percentages: KOCN 25 - 30%, NaHCO 3 20 - 25%, Sr(OH) 2 2 - 5%, NaCl 10 - 15%, K 2 O 10 - 15%, KH 2 PO 4 2 - 5%, Li 2 B 4 O 7 5 - 10%, Ce(NO 3 ) 3 ·6H 2O 1 - 2%, ErCl 3 ·6H 2 O 2 - 3%, YCl 3 0.05 - 0.1%, complexing agent 1 - 2%, accelerator 0.5 - 1%.

[0007] Preferably, the highly permeable composite penetrant comprises the following components by weight percentage: KOCN 25 - 30%, NaHCO 3 20 - 25%, Sr(OH) 2 3.3 - 5%, NaCl 12 - 15%, K 2 O 12 - 15%, KH 2 PO 4 3 - 5%, Li 2 B 4 O 7 7 - 10%, Ce(NO 3 ) 3 ·6H 2 O 1 - 2%, ErCl 3 ·6H 2 O 2 - 3%, YCl 3 0.05 - 0.1%, complexing agent 1.2 - 1.5%, accelerator 0.5 - 0.8%.

[0008] Furthermore, the complexing agent is magnesium disodium ethylenediaminetetraacetate, and the accelerator is zinc tetraphenylporphyrin.

[0009] One of the technical solutions of the present invention is: a controllable ion infiltration process for an extra-large rack used in a marine environment, comprising the following steps:

[0010] (1) Degreasing: Immerse the rack in a neutral degreasing agent until the oil stain on the surface of the rack is completely removed;

[0011] (2) Hot water washing: Place the degreased rack in a hot water tank for cleaning;

[0012] (3) Cold water washing: Place the rack in deionized water at room temperature for rinsing and then dry it;

[0013] (4) Preheating: Place the rack in a preheating furnace, heat it up with the furnace and then keep it warm;

[0014] (5) Carbon, nitrogen and yttrium ion infiltration: Transfer the preheated rack into a carbon, nitrogen and yttrium ion infiltration furnace, and carry out carbon, nitrogen and yttrium ion infiltration using the highly permeable composite penetrant described in any one of claims 1 - 3;

[0015] (6) Oxygen ion stabilization: Transfer the rack after ion infiltration into an oxygen ion stabilization furnace, and use an oxygen ion penetrant to carry out stabilization treatment on the carbon, nitrogen and yttrium infiltration layer;

[0016] (7) Cooling: Move the rack to the air-cooling tank and cool it naturally to room temperature;

[0017] (8) Post-cleaning: Use deionized water to clean the residual infiltrant on the surface of the rack, dry it, and then air it;

[0018] (9) Oil immersion: Place the rack in an oil immersion tank filled with machine oil, immerse it in oil, and let it dry naturally.

[0019] Further, in step (1), the temperature of the neutral degreasing agent is 50 - 70 °C, and the treatment time is 10 - 30 min.

[0020] Further, in step (2), the temperature of the hot water tank is 50 - 70 °C, and the cleaning time is 1 - 3 min.

[0021] Further, in step (4), the heating rate is 5 - 10 °C / min, the holding temperature is 300 - 350 °C, and the time is 40 - 60 min.

[0022] Further, in step (5), the infiltration temperature is 400 - 450 °C, and the time is 300 - 360 min; preferably, the infiltration temperature is 410 - 430 °C.

[0023] Further, in step (6), the stabilization treatment temperature is 370 - 400 °C, and the time is 15 - 30 min; in step (6), the oxygen ion infiltrant includes the following components in weight percentages: NaOH 20% - 30%, NaNO 2 10% - 20%, K 2 CO 3 30% - 40%, NH 4 Cl 10% - 20%, La 2 (CO 3 ) 3 0.5% - 1%.

[0024] Preferably, in step (6), the oxygen ion infiltrant includes the following components in weight percentages: NaOH 20 - 30%, NaNO 2 15 - 20%, K 2 CO 3 35 - 40%, NH 4 Cl 14 - 20%, La 2 (CO 3 ) 3 0.5 - 1%.

[0025] Advantages of the present invention:

[0026] 1. The innovation of the present invention adopts a highly permeable composite penetrant added with a complexing agent and a promoter, and a carbonitridyloxy multi-element composite penetration layer with a compound layer depth of more than 30 μm and a surface hardness of the effective hardened layer reaching HV 0.1 above 850 is obtained on an extra-large 40CrNi2Mo rack. The constituent phases of the composite penetration layer are Fe (2-3) N and Fe 4 N phases, which have excellent wear resistance and corrosion resistance, solve the problems of wear resistance and corrosion resistance of extra-large racks under heavy loads in the marine environment, and significantly improve the environmental adaptability of XXX radars.

[0027] 2. In the promoter of the present invention, the Ω electrons on the porphyrin ring in zinc tetraphenylporphyrin have a strong interaction with the d orbitals of metal ions in molten KOCN and NaHCO 3 salts, which promotes the dissolution equilibrium of KOCN and NaHCO 3 to move towards the product direction, increasing the effective concentrations of CNO - and HCO 3 2- in the penetrant and enabling rapid penetration. At the same time, the cation Zn in the promoter zinc tetraphenylporphyrin forms Zn(OH) 2 precipitation with OH in the original penetrant, making the decomposition reaction of zinc tetraphenylporphyrin move towards the positive reaction direction, increasing the Ω electrons on the porphyrin ring in the molten salt, and further improving the penetration speed.

[0028] 3. The use of the complexing agent disodium magnesium ethylenediaminetetraacetate in the present invention has the following advantages: (1) The complexing agent cooperates with potassium, sodium, and lithium atoms in the penetrant to form a flocculant, increasing the stability and fluidity of the penetrant in the molten state. (2) The Na ions in the complexing agent disodium magnesium ethylenediaminetetraacetate are the same as the cations in NaHCO 3 and NaCl in the penetrant, and no new metal cations need to be introduced (Mg reacts with the alkaline penetrant to form Mg(OH) 2 , which does not affect the types of cations). K + and Na + in the penetrant adsorbed on the product surface can reduce the surface tension of the penetrant, which is beneficial to the wetting of the N, C co-permeated product and better contact between the penetrant and the product, increasing the speed of N, C penetration into the N, C co-permeated product and improving the solid surface activity, reducing the Gibbs free energy of the solid surface, making N, C more likely to penetrate into the product surface, and thus increasing the effective penetration layer depth on the product surface. (3) The melting point of the complexing agent disodium magnesium ethylenediaminetetraacetate is about 330 °C, which is lower than that of KOCN and NaHCO 3The melting points of salts etc. Therefore, due to the influence of multi-component substances such as complexing agents on the eutectic temperature, the melting point of the molten salt mixture can be reduced, keeping it at 380°C - 400°C. Besides saving a large amount of energy consumption, it also enables the rack to be subjected to salt bath treatment at a temperature of 420°C ± 8°C, reducing the deformation of the rack during the ion infiltration process and ensuring its original dimensional accuracy. The present invention has for the first time achieved that the flatness deformation of a super-large arc-shaped rack with a length of 13 m is only 0.20 - 0.25 mm. With the traditional penetrant formula for 40CrNi2Mo, it is difficult to obtain a compound infiltration layer with a thickness of more than 20 μm at 420°C.

[0029] 4. The penetrant of the present invention effectively solves the problems of low-temperature nitrogen-carbon-yttrium-oxygen ion infiltration, unclear thermo-dynamic equilibrium conditions, and slow infiltration speed. The racks produced according to the present invention have good mass consistency, and the qualified product rate is as high as over 98%; the appearance of the finished products is black, the composite infiltration layer is continuous, uniform, and complete, without defects such as powdering and looseness.

[0030] 5. The production process of the method of the present invention is green and environmentally friendly, achieving zero emissions. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 For the flatness detection of a large rack. The left figure is the flatness measurement before treatment, and the right figure is the flatness measurement after treatment.

[0032] Figure 2 For the energy spectrum analysis of the elements infiltrated into the surface layer of the rack. The left figure is the SEM image of the infiltration layer, and the right figure is the energy spectrum of elements such as N, C, and O.

[0033] Figure 3 For the XRD phase composition diagram of the test piece and the sample block in the furnace.

[0034] Figure 4 For the physical object and infiltration layer microstructure diagram of test piece 1 (×400).

[0035] Figure 5 For the physical object and infiltration layer microstructure diagram of test piece 2 (×400).

[0036] Figure 6 For the physical object and infiltration layer microstructure diagram of test piece 3 (×400).

[0037] Figure 7 For the neutral salt spray test diagram of test pieces 1 - 3 (720 h).

[0038] Figure 8 For the wear morphology diagram after the wear resistance test of test pieces 1 - 3. DETAILED DESCRIPTION OF THE INVENTION

[0039] The following further elaborates on the specific implementation manners of the present invention in conjunction with the embodiments.

[0040] Example 1

[0041] Taking a section (arc length about 4.3 m) of the ultra-large arc-shaped 40CrNi2Mo rack of XXX radar as an example, it is processed according to the controllable ion infiltration process of the present invention. The furnace test pieces and the rack are processed together. The specific steps are as follows:

[0042] (1) Degreasing: Immerse the rack in a neutral degreasing agent (Degreasing Agent B DLN-111 of Hunan Delain New Material Technology Co., Ltd.) at 70 °C for 10 min until the oil stain on the surface of the rack is completely removed;

[0043] (2) Hot water washing: Place the degreased rack in a hot water tank at 70 °C and wash for 1 min;

[0044] (3) Cold water washing: Place the rack in deionized water at room temperature and rinse for 3 min, and blow dry the surface of the rack with compressed air;

[0045] (4) Preheating: Place the rack in a preheating furnace, slowly heat up with the furnace, the heating rate is 5 °C / min, and keep it at 350 °C for 60 min after reaching;

[0046] (5) Carbon, nitrogen and yttrium ion infiltration: Quickly transfer the preheated rack into a carbon, nitrogen and yttrium ion infiltration furnace, and use a highly permeable composite infiltrant for carbon, nitrogen and yttrium ion infiltration. The infiltration temperature is 420 °C and the time is 360 min; among them, the infiltrant includes the following components by weight percentage: KOCN 30%, NaHCO 3 22%, Sr(OH) 2 3.32%, NaCl 15%, K 2 O 12%, KH 2 PO 4 4%, Li 2 B 4 O 7 8%, Ce(NO 3 ) 3 ·6H 2 O 1.3%, ErCl 3 ·6H 2 O 2.3%, YCl 3 0.08%, complexing agent disodium magnesium ethylenediaminetetraacetate 1.2%, accelerator zinc tetraphenylporphyrin 0.8%;

[0047] (6) Oxygen ion stabilization: Quickly transfer the rack after ion infiltration into an oxygen ion stabilization furnace, and use an oxygen ion infiltrant to stabilize the carbon, nitrogen and yttrium infiltration layer. The treatment temperature is 400 °C and the time is 30 min; the oxygen ion infiltrant includes the following components by weight percentage: NaOH 20%, NaNO 2 20%, K 2 CO3 39%, NH 4 Cl 20%, La 2 (CO 3 ) 3 1%;

[0048] (7) Cooling: Move the rack to the air-cooling tank and cool it naturally to room temperature;

[0049] (8) Post-cleaning: Use deionized water to clean the residual infiltrant on the surface of the rack, blow it dry with compressed air and then air-dry it;

[0050] (9) Oil immersion: Put the air-dried rack into the oil-immersion tank filled with 20# machine oil, immerse it for 30 min, and air-dry it naturally.

[0051] Inspection:

[0052] (1) After the above controllable ion infiltration treatment, the appearance of the rack is black, the composite infiltration layer is continuous, uniform and complete, without defects such as powdering and looseness.

[0053] (2) After the above controllable ion infiltration treatment, the flatness change value of the rack is 0.1 - 0.15 mm, and the radian change value is 0.1 - 0.12 mm, meeting the design requirements (as Figure 1 ) shown).

[0054] (3) By testing the test pieces in the furnace, the compound layer depth of the carbon, nitrogen, yttrium and oxygen multi-element composite infiltration layer obtained is 20 - 35 μm, and the surface hardness of the effective hardened layer reaches HV 0.1 850 - 860. Figure 2 For the energy spectrum analysis of the elements infiltrated into the surface layer of the rack, the results show that there are N, C and O element distributions in the infiltration layer. Figure 3 For the XRD diffraction analysis, the surface phase composition is Fe (2-3) N and Fe 4 N phase.

[0055] Inspection conclusion: The quality is qualified and meets the design requirements.

[0056] Example 2

[0057] Taking a section (arc length about 4.3 m) of the ultra-large arc-shaped 40CrNi2Mo rack of the XXX radar as an example, it is processed according to the controllable ion infiltration process of the present invention, and the test pieces in the furnace and the rack are processed together. The specific steps are as follows:

[0058] (1) Degreasing: Immerse the rack in a neutral degreasing agent (Degreasing Agent B DLN-111 of Hunan Delain New Materials Technology Co., Ltd.) at 50 °C for 30 min until the oil stain on the surface of the rack is completely removed;

[0059] (2) Hot water wash: Place the degreased rack in a hot water bath at 50 °C and wash for 3 min;

[0060] (3) Cold water wash: Place the rack in deionized water at room temperature and rinse for 1 min, then dry the surface of the rack with compressed air;

[0061] (4) Preheating: Place the rack in a preheating furnace and slowly heat it up with the furnace. The heating rate is 10 °C / min. After reaching 350 °C, hold for 50 min;

[0062] (5) Carbon, nitrogen, and yttrium ion infiltration: Quickly transfer the preheated rack into a carbon, nitrogen, and yttrium ion infiltration furnace and conduct carbon, nitrogen, and yttrium ion infiltration using a highly permeable composite infiltrant. The infiltration temperature is 420 °C and the time is 360 min; Among them, the infiltrant includes the following components by weight percentage: KOCN 25%, NaHCO 3 25%, Sr(OH) 2 5%, NaCl 13%, K 2 O 15%, KH 2 PO 4 5%, Li 2 B 4 O 7 7%, Ce(NO 3 ) 3 ·6H 2 O 1%, ErCl 3 ·6H 2 O 2%, YCl 3 0.05%, complexing agent disodium magnesium ethylenediaminetetraacetate 1.45%, accelerator zinc tetraphenylporphyrin 0.5%;

[0063] (6) Oxygen ion stabilization: Quickly transfer the rack after ion infiltration into an oxygen ion stabilization furnace and use an oxygen ion infiltrant to stabilize the carbon, nitrogen, and yttrium infiltration layer. The treatment temperature is 370 °C and the time is 30 min; The oxygen ion infiltrant includes the following components by weight percentage: NaOH 25%, NaNO 2 20%, K 2 CO 3 35%, NH 4 Cl 19.5%, La 2 (CO 3 ) 3 0.5%;

[0064] (7) Cooling: Transfer the rack to an air-cooling tank and naturally cool it to room temperature;

[0065] (8) Post-washing: Use deionized water to clean the residual infiltrant on the surface of the rack, dry it with compressed air, and then let it air-dry;

[0066] (9) Oil immersion: Place the air-dried rack in an oil immersion tank filled with No. 10 machine oil and immerse it for 40 minutes, then let it dry naturally.

[0067] Example 3

[0068] Taking a section (arc length about 4.3 m) of the ultra-large arc-shaped 40CrNi2Mo rack of XXX radar as an example, it is processed according to the controllable ion infiltration process of the present invention, and the furnace test pieces are processed together with the rack. The specific steps are as follows:

[0069] (1) Degreasing: Immerse the rack in a neutral degreasing agent (Degreasing Agent B DLN-111 of Hunan Delain New Material Technology Co., Ltd.) at 60 °C for 20 minutes until the oil stain on the surface of the rack is completely removed;

[0070] (2) Hot water washing: Place the degreased rack in a hot water tank at 60 °C and wash it for 2 minutes;

[0071] (3) Cold water washing: Place the rack in deionized water at room temperature and rinse it for 2 minutes, and blow dry the surface of the rack with compressed air;

[0072] (4) Preheating: Place the rack in a preheating furnace and slowly heat it up with the furnace. The heating rate is 8 °C / min. After reaching 350 °C, keep it warm for 40 minutes;

[0073] (5) Carbon, nitrogen and yttrium ion infiltration: Quickly transfer the preheated rack into a carbon, nitrogen and yttrium ion infiltration furnace, and use a highly permeable composite infiltrant for carbon, nitrogen and yttrium ion infiltration. The infiltration temperature is 420 °C and the time is 360 minutes; Among them, the infiltrant includes the following components in weight percentage: KOCN 28.9%, NaHCO 3 20%, Sr(OH) 2 5%, NaCl 12%, K 2 O 14%, KH 2 PO 4 3%, Li 2 B 4 O 7 10%, Ce(NO 3 ) 3 ·6H 2 O 2%, ErCl 3 ·6H 2 O 3%, YCl 3 0.1%, complexing agent disodium magnesium ethylenediaminetetraacetate 1.5%, accelerator zinc tetraphenylporphyrin 0.5%;

[0074] (6) Oxygen ion stabilization: Rapidly transfer the ion-infiltrated rack into an oxygen ion stabilization furnace, and use an oxygen ion infiltrant to stabilize the carbonitride yttrium infiltration layer. The treatment temperature is 380 °C and the time is 30 min. The oxygen ion infiltrant includes the following components by weight percentage: NaOH 30%, NaNO 2 15%, K 2 CO 3 40%, NH 4 Cl 14%, La 2 (CO 3 ) 3 1%;

[0075] (7) Cooling: Transfer the rack to an air-cooling tank and naturally cool it to room temperature;

[0076] (8) Post-cleaning: Use deionized water to clean the residual infiltrant on the surface of the rack, blow it dry with compressed air and then air-dry it;

[0077] (9) Oil immersion: Place the air-dried rack into an oil immersion tank filled with 20# machine oil, immerse it for 35 min, and then naturally air-dry it.

[0078] Experimental examples

[0079] 1. Control example:

[0080] Take the super-large arc-shaped 40CrNi2Mo rack test pieces 1 and 2 (arc length about 4.2 m - 4.5 m) as control examples. The specific control situation is shown in Table 1 and Figures 4 - 6 as follows.

[0081] Table 1 Control test situation

[0082]

[0083] 2. Salt spray test:

[0084] According to GB / T10125-2012 "Artificial atmosphere corrosion test - Salt spray test", measure the corrosion resistance of the specimens after different process treatments. Salt spray test chamber temperature: 35 ± 2 °C; Relative humidity in the salt spray test chamber ≤ 70%; Saturation barrel temperature: 47 °C; pH value of the sedimented salt solution: 6.5 - 7.2; Spray rate: (1.0 - 2.0) mL / (80 cm 2 ·h). Corrosion occurred in test piece 1 at 120 h, corrosion occurred in test piece 2 at 240 h, and no rust occurred in test piece 3 at 720 h( Figure 7 ). It is proved that the present invention can meet the high anti-corrosion performance requirements of large racks.

[0085] 3. Wear test:

[0086] The wear test was carried out on an HT-1000 high-temperature friction and wear testing machine. The oil on the surface of the specimen was removed by vibrating and cleaning in an ultrasonic acetone solution, dried with an electric hair dryer, and then weighed to prepare for the test. The environmental test temperature was 25 °C, the load was 150 N, the rotational speed was 560 r / min, the rubbing time was 10 min, and the counter-material was a high-hardness SiC ball with a diameter of 5 mm. After each cycle of wear, the specimen was removed, ultrasonically vibrated and cleaned, and dried with an electric hair dryer. Then, the surface morphology and wear scar size of the worn specimen were observed with a Keyence VHX-5000 in Japan. The wear scar depth of Specimen 1 was 5 μm, the wear scar depth of Specimen 2 was 4 μm, and the wear scar depth of Specimen 3 was 2 μm( Figure 8 ). It shows that the present invention can meet the high wear resistance requirements of large racks.

[0087] It can be seen from the above results that: compared with the embodiments of the present invention, the case depth of the two control cases did not meet the standard, the flatness measurement did not meet the standard, the salt spray was unqualified, the wear did not meet the standard, and the test results were all unqualified and could not meet the design requirements.

[0088] 4. Application of extra-large arc racks (13 meters):

[0089] Due to the limited size of the processing equipment (5 meters), the 13-meter-long rack was designed as a three-section combined component, processed in sections and then assembled. The results showed that the deformation of the flatness of the 13-meter-long extra-large arc rack processed by the method of the present invention (Example 1) was only 0.20 - 0.25 mm.

Claims

1. A highly permeable composite penetrant for ultra-large racks in the marine environment, characterized in that, Comprising components in the following weight percentages: 25 - 30% of KOCN, 20 - 25% of NaHCO 3 2, 2 - 5% of Sr(OH) 2 2, 10 - 15% of NaCl, 10 - 15% of K 2 O, 2 - 5% of KH 2 PO 4 2, 2 - 5% of Li 2 B 4 O 7 2, 5 - 10% of Ce(NO 3 ) 3 ·6H 2 O, 1 - 2% of ErCl 3 •6H 2 O, 2 - 3% of YCl 3 2, 0.05 - 0.1%, 1 - 2% of complexing agent, 0.5 - 1% of accelerator; the complexing agent is disodium magnesium ethylenediaminetetraacetate, and the accelerator is zinc tetraphenylporphyrin.

2. The highly permeable composite penetrant according to claim 1, characterized in that, Comprising components in the following weight percentages: KOCN 25 - 30%, NaHCO 3 20 - 25%, Sr(OH) 2 3.3 - 5%, NaCl 12 - 15%, K 2 O 12 - 15%, KH 2 PO 4 3 - 5%, Li 2 B 4 O 7 7 - 10%, Ce(NO 3 ) 3 ·6H 2 O 1 - 2%, ErCl 3 •6H 2 O 2 - 3%, YCl 3 0.05 - 0.1%, complexing agent 1.2 - 1.5%, accelerator 0.5 - 0.8%.

3. A controllable ion implantation process for ultra-large racks in the marine environment, characterized in that, comprises the following steps: (1) Degreasing: Immerse the rack in a neutral degreasing agent until the oil stain on the rack surface is completely removed; (2) Hot water washing: Place the degreased rack in a hot water tank for cleaning; (3) Cold water washing: Place the rack in deionized water at room temperature for rinsing and blow dry; (4) Preheating: Place the rack in a preheating furnace, heat up with the furnace and then keep warm; (5) Carbon, nitrogen and yttrium ion implantation: Transfer the preheated rack into a carbon, nitrogen and yttrium ion implantation furnace, and carry out carbon, nitrogen and yttrium ion implantation using the highly permeable composite penetrant described in claim 1 or 2; (6) Oxygen ion stabilization: Transfer the rack after ion implantation into an oxygen ion stabilization furnace, and use an oxygen ion penetrant to carry out stabilization treatment on the carbon, nitrogen and yttrium implantation layer; (7) Cooling: Transfer the rack to an air cooling tank and naturally cool it to room temperature; (8) Post-washing: Use deionized water to clean the residual penetrant on the rack surface, blow dry and then air dry; (9) Oil immersion: Place the rack in an oil immersion tank filled with machine oil, immerse it in oil and naturally dry it.

4. The controllable ion implantation process according to claim 3, characterized in that, in step (1), the temperature of the neutral degreasing agent is 50-70°C and the treatment time is 10-30 min.

5. The controllable ion implantation process according to claim 3, characterized in that, in step (2), the temperature of the hot water tank is 50-70°C and the cleaning time is 1-3 min.

6. The controllable ion implantation process according to claim 3, characterized in that, in step (4), the heating rate is 5-10°C / min, the holding temperature is 300-350°C and the time is 40-60 min.

7. The controllable ion implantation process according to claim 3, characterized in that, in step (5), the implantation temperature is 400-450°C and the time is 300-360 min.

8. The controllable ion implantation process according to claim 3, characterized in that, In step (6), the stabilization treatment temperature is 370~400 °C and the time is 15~30 min; the oxygen ion permeating agent in step (6) comprises the following components in weight percentages: NaOH 20%~30%, NaNO 2 10%~20%, K 2 CO 3 30%~40%, NH 4 Cl 10%~20%, La 2 (CO 3 ) 3 0.5%~1%.

9. The controllable ion implantation process according to claim 8, characterized in that, In step (6), the oxygen ion penetrant comprises components in the following weight percentages: NaOH 20 - 30%, NaNO 2 15 - 20%, K 2 CO 3 35 - 40%, NH 4 Cl 14 - 20%, La 2 (CO 3 ) 3 0.5 - 1%.

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