CN111636046A - Local ion nitriding method for deep cavity threads of titanium alloy part - Google Patents
Local ion nitriding method for deep cavity threads of titanium alloy part Download PDFInfo
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- CN111636046A CN111636046A CN202010387858.3A CN202010387858A CN111636046A CN 111636046 A CN111636046 A CN 111636046A CN 202010387858 A CN202010387858 A CN 202010387858A CN 111636046 A CN111636046 A CN 111636046A
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/04—Treatment of selected surface areas, e.g. using masks
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/36—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases using ionised gases, e.g. ionitriding
Abstract
The invention relates to a method for local ion nitriding of a deep cavity thread of a titanium alloy part, belonging to the technical field of chemical heat treatment; manufacturing a nitriding tool according to the size and shape of the titanium alloy part; step two, carrying out vacuum annealing treatment on the nitriding tool; wiping the titanium alloy part and the nitriding tool, and drying by using oil-free compressed air or nitrogen; step four, coating the nitriding tool on the outer wall of the titanium alloy part; step five, repeating the step one to the step four n times, and manufacturing n nitriding tools for coating the titanium alloy parts; uniformly arranging n nitriding tools on an ionization disc in an annular shape; n is a positive integer; sixthly, nitriding the titanium alloy part; the invention protects the outer surface of the part and the non-nitriding part of the deep cavity from being provided with the nitriding layer through tool design, and adjusts the temperature, time, atmosphere and electrical parameters in the nitriding process, so that the whole deep cavity thread can obtain the hardness and the nitriding depth of the nitriding layer which meet the technical requirements.
Description
Technical Field
The invention belongs to the technical field of chemical heat treatment, and relates to a method for local ion nitriding of deep cavity threads of a titanium alloy part.
Background
The titanium alloy has two remarkable advantages of high specific strength and good corrosion resistance, has excellent performances of high specific strength, high fatigue property, high corrosion resistance, low expansion coefficient, high stability and the like, and has good application prospect in the field of aerospace.
Because of the defects of low surface strength, low thermal conductivity, poor wear resistance and the like of the titanium alloy, the titanium alloy part is easy to adhere and bite in the assembling process, and further the part fails and even breaks. In order to improve the wear resistance of the titanium alloy, the surface strength is increased through ion nitriding surface modification treatment, so that the service life of parts is prolonged.
The ion nitriding is to utilize the rarefied nitrogen-containing gas to generate glow discharge to bombard and heat the surface of the metal material and form nitride for strengthening. The conventional nitriding treatment is mainly aimed at the outer surface of a part, the deep cavity thread nitriding is to carry out local nitriding on the inner thread of the part, meanwhile, the outer surface and the inner hole non-permeable part of the part need to be protected against seepage, and a protection device cannot hinder the normal nitriding of the deep cavity. When nitriding is carried out in the deep cavity, due to the characteristic of glow cathode voltage drop, a glow layer is difficult to penetrate into the deep cavity, so that the deep cavity cannot be nitrided or the depth distribution of the nitriding layer is uneven, and the use requirement of the wear resistance of the thread cannot be met.
Disclosure of Invention
The technical problem solved by the invention is as follows: the method overcomes the defects of the prior art, provides a method for local ion nitriding of the deep cavity thread of the titanium alloy part, protects the outer surface of the part and the non-nitriding part of the deep cavity without a nitriding layer through tool design, and adjusts the temperature, time, atmosphere and electrical parameters in the nitriding process so that the whole deep cavity thread obtains the hardness and the nitriding depth of the nitriding layer meeting the technical requirements.
The technical scheme of the invention is as follows:
a method for local ion nitriding of deep cavity threads of a titanium alloy part comprises the following steps:
manufacturing a nitriding tool according to the size and shape of the titanium alloy part;
step two, carrying out vacuum annealing treatment on the nitriding tool;
wiping the titanium alloy part and the nitriding tool, and drying by using oil-free compressed air or nitrogen;
step four, coating the nitriding tool on the outer wall of the titanium alloy part;
step five, repeating the step one to the step four n times, and manufacturing n nitriding tools for coating the titanium alloy parts; uniformly arranging n nitriding tools on an ionization disc in an annular shape; n is a positive integer;
and sixthly, nitriding the titanium alloy part.
In the above method for local ion nitriding of deep cavity threads of a titanium alloy part, in the first step, the titanium alloy part is in a columnar structure; a columnar through hole is formed in the axis of the titanium alloy part along the axis direction; the nitriding tool is of a hollow shell structure; and the position of the nitriding tool corresponding to the columnar through hole is provided with exposed holes with the same size.
In the above method for local ion nitriding of deep cavity threads of a titanium alloy part, in the second step, the specific method of vacuum annealing treatment is as follows:
s1, placing the nitriding tool into a combustion furnace;
s2, carrying out vacuum pumping treatment on the combustion furnace;
s3, heating and insulating the combustion furnace;
and S4, cooling and discharging.
In the above method for local ion nitriding of the deep cavity thread of the titanium alloy part, in step two, S2, the degree of vacuum after the furnace is vacuumized is better than 5 Pa; in the step S3, the heating rate is 8-15 ℃/min in the process of heating the combustion furnace; until the temperature is heated to 800-850 ℃; stopping heating, and keeping the temperature for 1-3 h; and S4, naturally cooling the combustion furnace, and discharging the nitriding tool when the temperature of the combustion furnace is reduced to less than 150 ℃.
In the method for local ion nitriding of the deep cavity threads of the titanium alloy part, in the third step, the titanium alloy part and a nitriding tool are wiped by absolute ethyl alcohol; when in wiping, the outer wall of the titanium alloy part and the inner wall of the columnar through hole are wiped; and wiping the outer wall and the inner wall of the nitriding tool.
In the fourth step, when the nitriding tool coats the titanium alloy part, the nitriding tool is adjusted to completely cover the outer surface of the titanium alloy part, and meanwhile, two ends of the columnar through hole of the titanium alloy part are completely exposed through the exposed hole.
In the above method for local ion nitriding of deep cavity threads of titanium alloy parts, in the fifth step, n is an even number and is greater than or equal to 4; the n nitriding tools are all arranged along the radial direction of the ionization disc in the axial direction.
In the sixth step, the specific method for performing nitriding treatment on the titanium alloy part comprises the following steps:
s1, placing n nitriding tools and ionizing discs coated with titanium alloy parts in a closed box;
s2, carrying out vacuum pumping treatment on the closed box body;
s3, heating and insulating the closed box;
s4, in the heat preservation process, filling mixed gas of nitrogen and argon into the closed box body;
s5, electrifying the ionization disc; generating an electric field in the closed box body, and ionizing nitrogen atoms and titanium atoms to generate titanium nitride;
and S6, cooling and taking out of the box to finish nitriding.
In the above method for local ion nitriding of the deep cavity thread of the titanium alloy part, in step six, in S2, after the closed box body is vacuumized, the vacuum degree is superior to 5 Pa; in S3, when the sealed box body is heated, the temperature rise rate of the sealed box body is 5-10 ℃/min; stopping heating until the temperature is 750-; in S4, the ratio of nitrogen to argon in the mixed gas is 3.0:0.1 to 3.0: 0.5; stopping inflating until the pressure in the closed box body is 400-800 Pa; in S5, the current is 30-60A, and the voltage is 400-600V; generating titanium nitride on the inner wall of the exposed columnar through hole of the titanium alloy part; s6, continuously filling a mixed gas of nitrogen and argon in the cooling process of the closed box body; until the temperature of the closed box body is reduced to be less than 50 ℃; and taking out the nitriding tool for coating the titanium alloy part, and removing the nitriding tool to finish nitriding the titanium alloy part.
According to the method for local ion nitriding of the deep cavity threads of the titanium alloy part, the surface hardness HV of a nitrided titanium alloy part is more than or equal to 650; depth D of deep nitrogen layerND is more than or equal to 0.015mmN≤0.030mm。
Compared with the prior art, the invention has the beneficial effects that:
(1) aiming at the problem of nitriding the titanium alloy inner cavity threads, the nitriding tool is adopted, so that the outer surface of the titanium alloy can be ensured not to have a permeation layer, the inner cavity thread nitriding can be ensured not to be influenced, and the titanium alloy is supported by the tool, so that the glow nitriding process is better ensured;
(2) according to the invention, nitriding is carried out in a hydrogen-free atmosphere, the titanium alloy is easy to absorb hydrogen in a hydrogen atmosphere, and hydrogen embrittlement is easily generated when the hydrogen content in the titanium alloy reaches a certain degree, so that the titanium alloy is ineffective. The hydrogen-free nitriding can effectively avoid hydrogen embrittlement of the titanium alloy;
(3) the invention adopts ion nitriding, which adopts a mode of bombarding the surface of the titanium alloy by plasma, can effectively shorten nitriding time and greatly improve the working efficiency compared with gas nitriding;
(4) the invention can adjust the electrical parameter in the nitriding process, and can meet the requirement of uniform distribution of the nitriding layer along the threads of the inner cavity;
(5) the nitriding layer can be prepared on the threaded surface of the inner cavity of the titanium alloy part, through surface Vickers hardness detection, metallographic observation and scanning electron microscope observation, the hardness and nitriding of the nitriding layer meet the requirements, and the nitriding layer is uniform and free of defects. The non-nitrided matrix developed a slight corrosion under 7 hours of salt spray corrosion, while no significant corrosion was seen in the nitrided parts. The nitriding layer can realize accurate control, and the following technical index requirements are met: the surface hardness HV of the nitriding part is more than or equal to 650; DN is more than or equal to 0.015mm and less than or equal to 0.030 mm.
Drawings
FIG. 1 is a schematic view of a titanium alloy part of the present invention;
FIG. 2 is a schematic view of a nitriding tool according to the present invention;
FIG. 3 is a schematic view showing the distribution of the nitriding tool on an ionization disc according to the present invention;
FIG. 4 is a diagram of the metallographic detection effect of the present invention.
Detailed Description
The invention is further illustrated by the following examples.
The invention provides a method suitable for local ion nitriding of deep cavity threads of a titanium alloy part. The outer surface of the part and the non-nitriding part of the deep cavity are protected from a nitriding layer through tool design, and the temperature, time, atmosphere and electrical parameters in the nitriding process are adjusted, so that the whole deep cavity thread can obtain the hardness and the nitriding depth of the nitriding layer meeting the technical requirements.
The specific process comprises the following steps:
firstly, manufacturing a nitriding tool 2 according to the size and shape of a titanium alloy part 1; as shown in fig. 1, the titanium alloy part 1 has a columnar structure; a columnar through hole 11 is formed in the axis of the titanium alloy part 1 along the axis direction; the nitriding tool 2 is of a hollow shell structure; as shown in fig. 2, the nitriding tool 2 is provided with exposure holes 21 having the same size at positions corresponding to the columnar through holes 11.
Step two, carrying out vacuum annealing treatment on the nitriding tool 2; the specific method of the vacuum annealing treatment comprises the following steps:
s1, placing the nitriding tool 2 into a combustion furnace.
S2, carrying out vacuum pumping treatment on the combustion furnace; the vacuum degree of the furnace after vacuum pumping is better than 5 Pa.
S3, heating and insulating the combustion furnace; in the heating process of the combustion furnace, the heating rate is 8-15 ℃/min; until the temperature is heated to 800-850 ℃; stopping heating, and keeping the temperature for 1-3 h.
And S4, cooling and discharging, naturally cooling the combustion furnace, and discharging the nitriding tool 2 when the temperature of the combustion furnace is reduced to be less than 150 ℃. .
Wiping the titanium alloy part 1 and the nitriding tool 2, and wiping the titanium alloy part 1 and the nitriding tool 2 by adopting absolute ethyl alcohol; when wiping, wiping the outer wall of the titanium alloy part 1 and the inner wall of the columnar through hole 11; and wiping the outer wall and the inner wall of the nitriding tool 2. Blow-drying by oil-free compressed air or nitrogen.
Fourthly, coating the outer wall of the titanium alloy part 1 with a nitriding tool 2; when the nitriding tool 2 coats the titanium alloy part 1, the nitriding tool 2 is adjusted to completely cover the outer surface of the titanium alloy part 1, and meanwhile, two ends of the columnar through hole 11 of the titanium alloy part 1 are completely exposed through the exposed hole 21.
Step five, repeating the step one to the step four n times, and manufacturing n nitriding tools 2 for coating the titanium alloy parts 1; uniformly arranging n nitriding tools 2 on an ionization disc 3 in an annular shape; n is a positive integer; n is an even number and is greater than or equal to 4; the n nitriding tools 2 are all arranged along the radial direction of the ionization disc 3 in the axial direction, as shown in figure 3.
And sixthly, nitriding the titanium alloy part 1. The specific method for nitriding the titanium alloy part 1 comprises the following steps:
s1, placing n nitriding tools 2 coated with titanium alloy parts 1 and an ionization disc 3 in a closed box;
s2, carrying out vacuum pumping treatment on the closed box body; after the sealed box body is vacuumized, the vacuum degree is superior to 5 Pa.
S3, heating and insulating the closed box; when the closed box body is heated, the temperature rise rate of the closed box body is 5-10 ℃/min; stopping heating until the temperature is 750-850 ℃, and preserving the heat for 10-20 h.
S4, in the heat preservation process, filling mixed gas of nitrogen and argon into the closed box body; the ratio of nitrogen to argon in the mixed gas was 3.0:0.1 to 3.0: 0.5; and stopping inflating until the pressure in the closed box body is 400-800 Pa.
S5, electrifying the ionization disc 3; generating an electric field in the closed box body, and ionizing nitrogen atoms and titanium atoms to generate titanium nitride; the electrified current is 30-60A, and the voltage is 400-600V; titanium nitride is formed on the inner wall of the columnar through hole 11 exposed from the titanium alloy part 1.
And S6, cooling and taking out of the box to finish nitriding. The specific process is that in the cooling process of the closed box body, the mixed gas of nitrogen and argon is continuously filled; until the temperature of the closed box body is reduced to be less than 50 ℃; and taking out the nitriding tool 2 for coating the titanium alloy part 1, and removing the nitriding tool 2 to finish nitriding the titanium alloy part 1.
The surface hardness HV of the nitrided titanium alloy part 1 is more than or equal to 650; depth D of deep nitrogen layerND is more than or equal to 0.015mmNIs less than or equal to 0.030mm, and the metallographic detection effect graph is shown in figure 4.
Examples
1) And designing a nitriding tool 2 according to the size and shape of the titanium alloy part 1, protecting the outer surface and two end surfaces of the titanium alloy part 1, and exposing an inner cavity of the end surface.
2) And (3) carrying out vacuum annealing heat treatment on the nitriding tool 2, wherein the heat treatment parameters are as follows:
a furnace charging mode: charging at room temperature;
the heating rate is as follows: 10 ℃/min;
vacuum annealing temperature: 830 ℃;
and (3) heat preservation: 2 h;
and (3) cooling: discharging from the furnace when the furnace temperature is below 150 ℃.
3) Wiping the whole outer surface and inner cavity of the nitriding tool 2 and the titanium alloy part 1 in the step by absolute ethyl alcohol, and drying by using compressed air;
4) clamping the titanium alloy part 1 in a nitriding tool 2, and adjusting the tool to enable two ends of an inner cavity to be free of shielding;
5) uniformly distributing a middle nitriding tool 2 (provided with a titanium alloy part 1) on an ionization disc 3, and adjusting the axial direction of the nitriding tool 2 to be along the radial direction of the ionization disc 3; the number of the nitriding tools 2 is even and is more than or equal to 4;
6) nitriding the medium titanium alloy part 1, wherein the nitriding treatment parameters are as follows:
a furnace charging mode: sealing the box body;
vacuum degree: the vacuum degree before heating is better than 5 Pa;
the heating rate is as follows: 5 ℃/min;
nitriding temperature: 800 ℃;
nitrogen gas: argon ratio: 3.0: 0.1; 400-800 pa;
voltage: 450V;
current: 50A.
Nitriding heat preservation time: 16 h;
7) and cooling the sealed box body to below 50 ℃, discharging the titanium alloy part 1, and keeping introducing gas in the cooling process.
The obtained nitriding layer of the titanium alloy part is detected by a Vickers hardness tester, and the hardness meets the requirement; through metallographic detection, nitriding is uniform and free of defects, and the requirement of depth of a permeable layer is met; through a salt spray test, the corrosion resistance of a nitriding part is improved compared with that of a non-nitriding part.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention, and those skilled in the art can make variations and modifications of the present invention without departing from the spirit and scope of the present invention by using the methods and technical contents disclosed above.
Claims (10)
1. A method for local ion nitriding of deep cavity threads of a titanium alloy part is characterized by comprising the following steps: the method comprises the following steps:
step one, manufacturing a nitriding tool (2) according to the size and shape of the titanium alloy part (1);
step two, carrying out vacuum annealing treatment on the nitriding tool (2);
wiping the titanium alloy part (1) and the nitriding tool (2), and drying by using oil-free compressed air or nitrogen;
fourthly, coating the nitriding tool (2) on the outer wall of the titanium alloy part (1);
step five, repeating the step one to the step four n times to manufacture n nitriding tools (2) coated with the titanium alloy parts (1); uniformly arranging n nitriding tools (2) on an ionization disc (3) in an annular shape; n is a positive integer;
and sixthly, nitriding the titanium alloy part (1).
2. The method for the local ion nitriding of deep-cavity threads of titanium alloy parts according to claim 1, characterized in that: in the first step, the titanium alloy part (1) is of a columnar structure; a columnar through hole (11) is formed in the axis of the titanium alloy part (1) along the axis direction; the nitriding tool (2) is of a hollow shell structure; and the nitriding tool (2) is provided with exposed holes (21) with the same size corresponding to the positions of the columnar through holes (11).
3. The method for the local ion nitriding of deep-cavity threads of titanium alloy parts according to claim 2, characterized in that: in the second step, the specific method of the vacuum annealing treatment comprises the following steps:
s1, placing the nitriding tool (2) into a combustion furnace;
s2, carrying out vacuum pumping treatment on the combustion furnace;
s3, heating and insulating the combustion furnace;
and S4, cooling and discharging.
4. The method for the local ion nitriding of deep-cavity threads of titanium alloy parts according to claim 3, wherein: in the step two, in S2, the vacuum degree of the combustion furnace after vacuum pumping is better than 5 Pa; in the step S3, the heating rate is 8-15 ℃/min in the process of heating the combustion furnace; until the temperature is heated to 800-850 ℃; stopping heating, and keeping the temperature for 1-3 h; and S4, naturally cooling the combustion furnace, and discharging the nitriding tool (2) when the temperature of the combustion furnace is reduced to be less than 150 ℃.
5. The method for the local ion nitriding of deep-cavity threads of titanium alloy parts according to claim 4, wherein: in the third step, the titanium alloy part (1) and the nitriding tool (2) are wiped by adopting absolute ethyl alcohol; when in wiping, the outer wall of the titanium alloy part (1) and the inner wall of the columnar through hole (11) are wiped; and wiping the outer wall and the inner wall of the nitriding tool (2).
6. The method for the local ion nitriding of deep-cavity threads of titanium alloy parts according to claim 5, wherein: in the fourth step, when the nitriding tool (2) coats the titanium alloy part (1), the nitriding tool (2) is adjusted to completely cover the outer surface of the titanium alloy part (1), and meanwhile, two ends of the columnar through hole (11) of the titanium alloy part (1) are completely exposed through the exposure hole (21).
7. The method for the local ion nitriding of deep-cavity threads of titanium alloy parts according to claim 6, wherein: in the fifth step, n is an even number and is more than or equal to 4; the n nitriding tools (2) are all arranged along the radial direction of the ionization disc (3) in the axial direction.
8. The method for the local ion nitriding of deep-cavity threads of titanium alloy parts according to claim 7, characterized in that: in the sixth step, the specific method for nitriding the titanium alloy part (1) comprises the following steps:
s1, placing n nitriding tools (2) coated with titanium alloy parts (1) and an ionization disc (3) in a closed box;
s2, carrying out vacuum pumping treatment on the closed box body;
s3, heating and insulating the closed box;
s4, in the heat preservation process, filling mixed gas of nitrogen and argon into the closed box body;
s5, electrifying the ionization disc (3); generating an electric field in the closed box body, and ionizing nitrogen atoms and titanium atoms to generate titanium nitride;
and S6, cooling and taking out of the box to finish nitriding.
9. The method for the local ion nitriding of deep-cavity threads of titanium alloy parts according to claim 8, characterized in that: in the step six, in S2, after the sealed box body is vacuumized, the vacuum degree is superior to 5 Pa; in S3, when the sealed box body is heated, the temperature rise rate of the sealed box body is 5-10 ℃/min; stopping heating until the temperature is 750-; in S4, the ratio of nitrogen to argon in the mixed gas is 3.0:0.1 to 3.0: 0.5; stopping inflating until the pressure in the closed box body is 400-800 Pa; in S5, the current is 30-60A, and the voltage is 400-600V; generating titanium nitride on the inner wall of the column-shaped through hole (11) exposed out of the titanium alloy part (1); s6, continuously filling a mixed gas of nitrogen and argon in the cooling process of the closed box body; until the temperature of the closed box body is reduced to be less than 50 ℃; and taking out the nitriding tool (2) for coating the titanium alloy part (1), and removing the nitriding tool (2) to finish nitriding the titanium alloy part (1).
10. Method for the local ion nitriding of deep-cavity threads of titanium alloy parts according to one of claims 1 to 9, characterized in that: the surface hardness HV of the nitrided titanium alloy part (1) is more than or equal to 650; depth D of deep nitrogen layerND is more than or equal to 0.015mmN≤0.030mm。
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| CN114196905A (en) * | 2021-11-17 | 2022-03-18 | 陕西钛博飞特航空制造股份有限公司 | Nitriding processing method of TC6 titanium alloy actuator cylinder for aerospace |
| CN114196905B (en) * | 2021-11-17 | 2024-02-27 | 陕西箴铭新材料科技有限公司 | Nitriding processing method of TC6 titanium alloy actuator cylinder for aerospace |
| CN114107883A (en) * | 2021-11-29 | 2022-03-01 | 上海航天设备制造总厂有限公司 | Local ion nitriding method for inner cavity of precipitation hardening stainless steel annular part |
| CN114107883B (en) * | 2021-11-29 | 2024-01-12 | 上海航天设备制造总厂有限公司 | Local ion nitriding method for inner cavity of precipitation hardening stainless steel annular part |
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