CN111235519A - Surface treatment method for improving surface wear resistance of eccentric shaft part - Google Patents
Surface treatment method for improving surface wear resistance of eccentric shaft part Download PDFInfo
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- CN111235519A CN111235519A CN202010198585.8A CN202010198585A CN111235519A CN 111235519 A CN111235519 A CN 111235519A CN 202010198585 A CN202010198585 A CN 202010198585A CN 111235519 A CN111235519 A CN 111235519A
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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
- C23C8/60—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 solids, e.g. powders, pastes
- C23C8/62—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 solids, e.g. powders, pastes only one element being applied
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Abstract
The invention discloses a surface treatment method for improving the surface wear resistance of an eccentric shaft part, which comprises the following steps: s1, cleaning; s2, preparing a nitriding agent, namely putting 55% of urea, 25% of ammonium bicarbonate, 5% of charcoal and 15% of graphite into a ball mill for mixing and ball milling to prepare the nitriding agent; s3, preparing a nitriding furnace; s4, preparing a nitriding box; s5, boxing, namely putting the cleaned eccentric shafts and the prepared nitriding agent into a nitriding box together, keeping the distance between the eccentric shafts to be at least 20mm, filling gaps between the eccentric shafts with the nitriding agent, and tamping to ensure that each eccentric shaft is surrounded by the nitriding agent; s6, performing stepped nitriding; s7, moving the nitriding box out of the nitriding furnace, air-cooling to below 200 ℃, and then opening a box cover of the nitriding box to continue cooling to room temperature; s8, taking the eccentric shafts out of the nitriding box, and cleaning each eccentric shaft by using alcohol. The invention not only reduces the cost, but also greatly improves the hardness and the wear resistance of the surface of the eccentric shaft.
Description
Technical Field
The invention relates to a surface treatment method of an eccentric shaft, in particular to a surface treatment method for improving the surface wear resistance of an eccentric shaft part.
Background
The RV reducer consists of a cycloidal pin wheel and a planet support, and is widely applied to the fields of industrial robots and the like due to the advantages of small size, strong impact resistance, large torque, high positioning precision, small vibration, large reduction ratio and the like. It has high fatigue strength, rigidity and service life, and stable return difference precision.
The eccentric shaft is a core part in the RV reducer, and the quality and the precision of the eccentric shaft have important influence on the return difference of the reducer, so that the transmission precision, the transmission efficiency and the service life of the reducer are directly influenced. The eccentric shaft is subjected to severe friction and abrasion and large alternating load, so that the requirements on the hardness and the abrasion resistance of the material of the eccentric shaft are high.
The surface treatment method of the eccentric shaft in the prior art has high cost, and the hardness and the wear resistance after treatment are not greatly improved.
Disclosure of Invention
The present invention has been made to solve the above problems, and an object of the present invention is to provide a surface treatment method for improving the wear resistance of the surface of an eccentric shaft part.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a surface treatment method for improving the surface wear resistance of an eccentric shaft part comprises the following steps:
s1, cleaning, namely performing oil stain removal treatment on the surface of the eccentric shaft to be treated;
s2, preparing a nitriding agent, namely putting 55% of urea, 25% of ammonium bicarbonate, 5% of charcoal and 15% of graphite into a ball mill for mixing and ball milling to prepare the nitriding agent;
s3, preparing a nitriding furnace, wherein the nitriding furnace is a box type resistance furnace;
s4, preparing a nitriding box, wherein the nitriding box is formed by welding TA1 pure titanium plates;
s5, boxing, namely putting the cleaned eccentric shafts and the prepared nitriding agent into a nitriding box, keeping the distance between the eccentric shafts to be at least 20mm, filling gaps between the eccentric shafts with the nitriding agent, tamping to ensure that each eccentric shaft is surrounded by the nitriding agent, capping and sealing the nitriding box, sealing by adopting clay, reserving 4-8 gaps around the nitriding box, and putting the nitriding box into a nitriding furnace after sealing;
s6, performing stepped nitriding;
s7, moving the nitriding box out of the nitriding furnace, air-cooling to below 200 ℃, and then opening a box cover of the nitriding box to continue cooling to room temperature;
s8, taking the eccentric shafts out of the nitriding box, and cleaning each eccentric shaft by using alcohol.
In a preferred embodiment of the present invention, in S1, oil stains and impurities on the surface of the eccentric shaft are firstly roughly washed, then the eccentric shaft is placed in an ultrasonic cleaning machine for fine cleaning, the surface of the eccentric shaft is cleaned by the ultrasonic cleaning machine so as to remove the oil stains on the surface of the eccentric shaft, and the surface of the eccentric shaft is dried after cleaning.
In a preferred embodiment of the invention, the kerosene is used for rough washing, after which the surface is wiped dry with a fibre cloth and air-dried for 2-3h, and then subjected to fine washing.
In a preferred embodiment of the invention, the ultrasonic frequency of the cleaning of the ultrasonic cleaning machine is 28-35kHz, the cleaning solution is acetone, the cleaning temperature of the ultrasonic cleaning machine is controlled at 50-60 ℃, and the cleaning power density of the ultrasonic cleaning machine is 0.35-0.38W/cm2The drying process of the eccentric shaft is carried out in an electric furnace, the drying temperature is 180-200 ℃, and the drying time is 20-30 min.
In a preferred embodiment of the present invention, in the S2, the charcoal particle size is 45-100 mesh, and the ball milling time is 1.5-2 h. .
In a preferred embodiment of the present invention, in S3, a layer of graphite is laid on the bottom of the box-type resistance furnace, and a layer of SiC particles is uniformly laid on the asbestos.
In a preferred embodiment of the present invention, in the S5, the eccentric shaft is vertically placed in the nitriding box, and the thickness of the nitriding agent covering the eccentric shaft is 35-50 mm.
In a preferred embodiment of the present invention, in S6, the step-type nitriding specifically includes the following steps:
1) in the preheating stage, the nitriding furnace is heated to 300 +/-10 ℃, and then the nitriding box is placed into the nitriding furnace and is kept for 30-40 min;
2) in the adsorption stage, the nitriding furnace is heated to 500 +/-10 ℃, and nitriding treatment is carried out for 40-60 min at the temperature;
3) in the diffusion stage, the nitriding furnace is heated to 550 +/-20 ℃, timing is started after the temperature is reached, and the nitriding furnace is treated for 60-120 min at the temperature;
4) and in the stabilization stage, the nitriding furnace is cooled to 400 +/-20 ℃, and the stabilization treatment is carried out for 120-150 min.
The invention has the beneficial effects that:
the invention not only reduces the cost, but also greatly improves the hardness and the wear resistance of the surface of the eccentric shaft.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further explained below.
The invention provides a surface treatment method for improving the surface wear resistance of an eccentric shaft part, which comprises the following steps:
s1, cleaning, namely performing oil stain removal treatment on the surface of the eccentric shaft to be treated;
s2, preparing a nitriding agent, namely putting 55% of urea, 25% of ammonium bicarbonate, 5% of charcoal and 15% of graphite into a ball mill for mixing and ball milling to prepare the nitriding agent;
s3, preparing a nitriding furnace, wherein the nitriding furnace is a box type resistance furnace;
s4, preparing a nitriding box, wherein the nitriding box is formed by welding TA1 pure titanium plates;
s5, boxing, namely putting the cleaned eccentric shafts and the prepared nitriding agent into a nitriding box, keeping the distance between the eccentric shafts to be at least 20mm, filling gaps between the eccentric shafts with the nitriding agent, tamping to ensure that each eccentric shaft is surrounded by the nitriding agent, capping and sealing the nitriding box, sealing by adopting clay, reserving 4-8 gaps around the nitriding box, and putting the nitriding box into a nitriding furnace after sealing;
s6, performing stepped nitriding;
s7, moving the nitriding box out of the nitriding furnace, air-cooling to below 200 ℃, and then opening a box cover of the nitriding box to continue cooling to room temperature;
s8, taking the eccentric shafts out of the nitriding box, and cleaning each eccentric shaft by using alcohol.
In the above step S1, firstly, oil stains and impurities on the surface of the eccentric shaft are roughly washed, then the eccentric shaft is placed in an ultrasonic cleaning machine for fine cleaning, the surface of the eccentric shaft is cleaned by the ultrasonic cleaning machine so as to remove the oil stains on the surface of the eccentric shaft, and the surface of the eccentric shaft is dried after cleaning, so that the cleaning quality can be improved, and the nitriding quality can also be improved.
Specifically, kerosene can be used for rough washing, the surface of the coal tar is wiped by fiber cloth after rough washing, the coal tar is dried for 2 to 3 hours, and then fine washing is carried out, so that the efficiency is improved.
The ultrasonic frequency of the ultrasonic cleaning machine is 28-35kHz, the frequency range is easy to generate cavitation in liquid through experiments, moderate cleaning force can be realized, thorough cleaning is guaranteed, the ultrasonic direction in the frequency range is strong, and the size precision of parts is not reduced.
The solution that adopts in the ultrasonic cleaner cleaning process is acetone, adopts chemical cleaning solvent acetone, can realize the combination of physical action (ultrasonic cleaning) and chemical action, and the cleaning performance accelerates, carries out abundant thorough washing to the part.
The cleaning temperature of the ultrasonic cleaning machine is controlled to be 50-60 ℃, and the temperature range not only ensures better cavitation effect, but also enhances the activity of a chemical solvent and greatly improves the cleaning effect.
The power density of the ultrasonic cleaning machine is 0.35-0.38W/cm2Since long-term high power density cleaning can cause "cavitation" on the surface of the part, lower power densities are selected.
Drying the surface of the part after cleaning; the part drying process is carried out in an electric furnace, and the drying temperature is as follows: drying at 180-200 ℃ for: 20min-30 min.
In S2, urea is used as a nitrogen donor, ammonium bicarbonate is used as an activator and a nitrogen donor, charcoal is used as an oxygen-absorbing and permeation promoter, and graphite is used as a filler.
In addition, the granularity of the charcoal is 45-100 meshes, and the ball milling time is 1.5-2h, so that the quality of the nitriding agent can be improved.
In the above S3, a layer of graphite is laid on the bottom of the box-type resistance furnace, and a layer of SiC particles is uniformly laid on the asbestos, so that the uniformity of the furnace temperature is improved and the wear deformation of the furnace bottom is reduced.
In the S4, because the service life of the TA1 plate is ten times of that of carbon steel, and the cost calculation is carried out according to the nitriding part of unit mass per unit time, the cost of nitriding operation of the nitriding box prepared by adopting the TA1 plate is the lowest, thereby reducing the cost.
In the above S5, the eccentric shaft is vertically disposed in the nitriding box, so that the uneven contact of the nitriding agent caused by the transverse placement or the oblique placement can be avoided.
In addition, the thickness of the nitriding layer is inconsistent, the deformation of parts at high temperature can be avoided, and the thickness of the nitriding agent coated by the eccentric shaft is set to be 35-50mm, so that the nitriding agent has a good supporting effect on a workpiece after being contracted in the nitriding process, a high nitriding speed is kept, the heating time is not too long, and the production efficiency is reduced.
And then, covering and sealing after boxing. Clay is used for sealing, and 4-8 pores are left around, so that explosion caused by a large amount of gas generated in the nitriding box can be prevented.
In the above S6, the step-wise nitriding specifically includes the steps of:
1) in the preheating stage, the nitriding furnace is heated to 300 +/-10 ℃, and then the nitriding box is placed into the nitriding furnace and is kept for 30-40 min;
2) in the adsorption stage, the nitriding furnace is heated to 500 +/-10 ℃, and nitriding treatment is carried out for 40-60 min at the temperature;
3) in the diffusion stage, the nitriding furnace is heated to 550 +/-20 ℃, timing is started after the temperature is reached, and the nitriding furnace is treated for 60-120 min at the temperature;
4) and in the stabilization stage, the nitriding furnace is cooled to 400 +/-20 ℃, and the stabilization treatment is carried out for 120-150 min.
By adopting the surface treatment method, the application can achieve the following effects:
(1) the nitriding agent has wide raw material sources and low price, and the equipment adopting nitriding is simple, has good nitriding effect and thick nitriding layer, can be widely used for batch surface hardening of complex parts such as eccentric shafts and the like, and improves the surface wear resistance;
(2) this application adopts cascaded nitridation, respectively through preheating, absorption, diffusion, four stages of stabilization, the sclerosis layer of formation is compact stable, and the hardening degree of depth is big, and easy operation can obtain the eccentric shaft part that has very high surface hardness and surface wearability.
Based on the implementation of the above surface treatment method, the present application also provides the following two embodiments:
example 1
S1, degreasing the eccentric shaft of the RV450-E speed reducer, cleaning oil stains and sundries on the surface of the eccentric shaft by kerosene, wiping the surface with fiber cloth, airing for 3 hours, then placing the eccentric shaft in an ultrasonic cleaning machine, cleaning the surface of the matrix by using the ultrasonic cleaning machine so as to remove the oil stains on the surface of the matrix, wherein the ultrasonic frequency is 32-35kHz, the solution adopted in the cleaning process is acetone, the ultrasonic cleaning temperature is controlled at 60 ℃, and the power density of ultrasonic cleaning is 0.38W/cm2And drying the surface of the part after cleaning, wherein the part drying process is carried out in an electric furnace, and the drying temperature is as follows: drying at 200 ℃ for a drying time: 25 min;
s2, preparing a nitriding agent, wherein the nitriding agent comprises the following components in percentage by mass: 55% of urea, 25% of ammonium bicarbonate, 5% of charcoal and 15% of graphite, wherein the granularity of the charcoal is 45-100 meshes, and the raw materials in parts by weight are mixed in a ball mill and are ball-milled for 2 hours to prepare the nitriding agent;
s3, preparing a nitriding furnace, wherein the nitriding furnace is a box type resistance furnace; laying a layer of graphite at the bottom of the box-type resistance furnace, and uniformly spreading a layer of SiC particles on the asbestos;
s4, preparing a nitriding box, wherein the nitriding box is formed by welding TA1 pure titanium plates;
s5, boxing, namely putting the eccentric shafts and the nitriding agent into a nitriding box, keeping a distance of 25-30mm between the eccentric shafts, filling gaps with the nitriding agent, tamping to enable each eccentric shaft to be surrounded by the nitriding agent, vertically placing the eccentric shafts, enabling the thickness of the nitriding agent layer surrounding the eccentric shafts to be 40-50mm, capping and sealing after boxing, adopting clay for sealing, reserving 6 holes at the periphery, and putting the nitriding box into a nitriding furnace after sealing;
s6, step nitriding, which comprises the following four stages:
1) preheating stage, heating nitriding furnace to 310 deg.C, placing nitriding box into nitriding furnace, holding temperature for 30min,
2) in the adsorption stage, the temperature of a nitriding furnace is raised to 505 ℃, nitriding treatment is carried out for 60min at the temperature,
3) in the diffusion stage, the nitriding furnace is heated to 560 ℃, timing is started after the temperature is reached, the treatment is carried out for 100min at the temperature,
4) a stabilization stage, cooling the furnace to 400 ℃ and carrying out stabilization treatment for 120 min;
s7, moving the nitriding box out of the nitriding furnace, air-cooling to 180 ℃, opening a box cover and continuously cooling to room temperature;
and S8, taking out the eccentric shaft, and cleaning the eccentric shaft by using alcohol.
The friction wear test and hardness test were performed on the untreated eccentric shaft and the eccentric shaft treated in the above example, and the test results were as follows:
as a result, it was found that: after the treatment of the embodiment, the friction and wear performance of the part is obviously improved, the hardness value is improved, and the friction coefficient is reduced.
Example 2
S1, degreasing the eccentric shaft of the RV320-E speed reducer, cleaning oil stains and sundries on the surface of the eccentric shaft by kerosene, wiping the surface with fiber cloth, airing for 2 hours, then placing the eccentric shaft in an ultrasonic cleaning machine, cleaning the surface of the matrix by using the ultrasonic cleaning machine so as to remove the oil stains on the surface of the matrix, wherein the ultrasonic frequency is 28-30kHz, the solution adopted in the cleaning process is acetone, the ultrasonic cleaning temperature is controlled at 50 ℃, and the power density of ultrasonic cleaning is 0.35-0.36W/cm2And drying the surface of the part after cleaning, wherein the part drying process is carried out in an electric furnace, and the drying temperature is as follows: drying at 200 ℃ for a drying time: 20 min;
s2, preparing a nitriding agent, wherein the nitriding agent comprises the following components in percentage by mass: 55% of urea, 25% of ammonium bicarbonate, 5% of charcoal and 15% of graphite, wherein the granularity of the charcoal is 45-100 meshes, and the raw materials in parts by weight are mixed in a ball mill and are ball-milled for 2 hours to prepare the nitriding agent;
s3, preparing a nitriding furnace, wherein the nitriding furnace is a box type resistance furnace; laying a layer of graphite at the bottom of the box-type resistance furnace, and uniformly spreading a layer of SiC particles on the asbestos;
s4, preparing a nitriding box, wherein the nitriding box is formed by welding TA1 pure titanium plates;
s5, boxing, namely putting the eccentric shafts and the nitriding agent into a nitriding box, keeping a distance of 20-30mm between the eccentric shafts, filling gaps with the nitriding agent, tamping to enable each eccentric shaft to be surrounded by the nitriding agent, vertically placing the eccentric shafts, enabling the thickness of the nitriding agent layer surrounding the eccentric shafts to be 35-45mm, capping and sealing after boxing, adopting clay for sealing, reserving 4 holes at the periphery, and putting the nitriding box into a nitriding furnace after sealing;
s6, step nitriding, which comprises the following four stages:
1) preheating stage, heating nitriding furnace to 310 deg.C, placing nitriding box into nitriding furnace, holding temperature for 40min,
2) in the adsorption stage, the temperature of a nitriding furnace is raised to 510 ℃, nitriding treatment is carried out for 50min at the temperature,
3) in the diffusion stage, the nitriding furnace is heated to 565 ℃, timing is started after the temperature is reached, the treatment is carried out for 120min at the temperature,
4) a stabilization stage, cooling the furnace to 380 ℃, and carrying out stabilization treatment for 150 min;
s7, moving the nitriding box out of the nitriding furnace, air-cooling to 170 ℃, opening a box cover and continuously cooling to room temperature;
and S8, taking out the eccentric shaft, and cleaning the eccentric shaft by using alcohol.
The friction wear test and hardness test were performed on the untreated eccentric shaft and the eccentric shaft treated in the above example, and the test results were as follows:
as a result, it was found that: after the treatment of the embodiment, the friction and wear performance of the part is obviously improved, the hardness value is improved, and the friction coefficient is reduced.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. A surface treatment method for improving the surface wear resistance of an eccentric shaft part is characterized by comprising the following steps:
s1, cleaning, namely performing oil stain removal treatment on the surface of the eccentric shaft to be treated;
s2, preparing a nitriding agent, namely putting 55% of urea, 25% of ammonium bicarbonate, 5% of charcoal and 15% of graphite into a ball mill for mixing and ball milling to prepare the nitriding agent;
s3, preparing a nitriding furnace, wherein the nitriding furnace is a box type resistance furnace;
s4, preparing a nitriding box, wherein the nitriding box is formed by welding TA1 pure titanium plates;
s5, boxing, namely putting the cleaned eccentric shafts and the prepared nitriding agent into a nitriding box, keeping the distance between the eccentric shafts to be at least 20mm, filling gaps between the eccentric shafts with the nitriding agent, tamping to ensure that each eccentric shaft is surrounded by the nitriding agent, capping and sealing the nitriding box, sealing by adopting clay, reserving 4-8 gaps around the nitriding box, and putting the nitriding box into a nitriding furnace after sealing;
s6, performing stepped nitriding;
s7, moving the nitriding box out of the nitriding furnace, air-cooling to below 200 ℃, and then opening a box cover of the nitriding box to continue cooling to room temperature;
s8, taking the eccentric shafts out of the nitriding box, and cleaning each eccentric shaft by using alcohol.
2. The surface treatment method for improving the wear resistance of the surface of the eccentric shaft part according to claim 1, wherein in the step S1, oil stains and impurities on the surface of the eccentric shaft are firstly roughly washed, then the eccentric shaft is placed in an ultrasonic cleaning machine for fine cleaning, the surface of the eccentric shaft is cleaned by the ultrasonic cleaning machine so as to remove the oil stains on the surface of the eccentric shaft, and the surface of the eccentric shaft is dried after cleaning.
3. The surface treatment method for improving the wear resistance of the surface of the eccentric shaft part as claimed in claim 2, wherein kerosene is used for rough washing, the surface is wiped by using a fiber cloth after the rough washing, the fiber cloth is dried for 2 to 3 hours, and then fine washing is carried out.
4. The surface treatment method for improving the wear resistance of the surface of the eccentric shaft part according to claim 2, wherein the ultrasonic frequency of the ultrasonic cleaning machine is 28 to 35kHz, the cleaning solution is acetone, the temperature of the ultrasonic cleaning machine is controlled to be 50 to 60 ℃, and the power density of the ultrasonic cleaning machine is 0.35 to 0.38W/cm2The drying process of the eccentric shaft is carried out in an electric furnace, the drying temperature is 180-200 ℃, and the drying time is 20-30 min.
5. The surface treatment method for improving the wear resistance of the surface of the eccentric shaft part according to claim 1, wherein in the step S2, the particle size of charcoal is 45-100 meshes, and the ball milling time is 1.5-2 h. .
6. The surface treatment method for improving the wear resistance of the surface of the eccentric shaft part according to claim 1, wherein in the step S3, a layer of graphite is laid on the bottom of the box-type resistance furnace, and a layer of SiC particles is uniformly laid on the asbestos.
7. The surface treatment method for improving the wear resistance of the surface of the eccentric shaft part as claimed in claim 1, wherein in the step S5, the eccentric shaft is vertically placed in a nitriding box, and the thickness of the nitriding agent for coating the eccentric shaft is 35-50 mm.
8. The surface treatment method for improving the surface wear resistance of the eccentric shaft part according to claim 1, wherein in the step-type nitriding step of S6, the method specifically comprises the following steps:
1) in the preheating stage, the nitriding furnace is heated to 300 +/-10 ℃, and then the nitriding box is placed into the nitriding furnace and is kept for 30-40 min;
2) in the adsorption stage, the nitriding furnace is heated to 500 +/-10 ℃, and nitriding treatment is carried out for 40-60 min at the temperature;
3) in the diffusion stage, the nitriding furnace is heated to 550 +/-20 ℃, timing is started after the temperature is reached, and the nitriding furnace is treated for 60-120 min at the temperature;
4) and in the stabilization stage, the nitriding furnace is cooled to 400 +/-20 ℃, and the stabilization treatment is carried out for 120-150 min.
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| JP2010180457A (en) * | 2009-02-06 | 2010-08-19 | Toyota Central R&D Labs Inc | Method for manufacturing corrosion-resistant electroconductive material |
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| CN109266831A (en) * | 2018-11-26 | 2019-01-25 | 江苏天硕合金材料有限公司 | Heat treatment method is used in a kind of production of saw blade |
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2020
- 2020-03-20 CN CN202010198585.8A patent/CN111235519A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2010180457A (en) * | 2009-02-06 | 2010-08-19 | Toyota Central R&D Labs Inc | Method for manufacturing corrosion-resistant electroconductive material |
| CN103045992A (en) * | 2012-12-12 | 2013-04-17 | 张云江 | Solid nitriding agent |
| CN109266831A (en) * | 2018-11-26 | 2019-01-25 | 江苏天硕合金材料有限公司 | Heat treatment method is used in a kind of production of saw blade |
Non-Patent Citations (1)
| Title |
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| 于玉城等: "35CrMo钢罐装法多段渗氮渗层组织与耐蚀性能", 《黑龙江科技学院学报》 * |
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Application publication date: 20200605 |