CN104789923A - Application method of rare earth in pre-oxidation and soft nitriding technology - Google Patents
Application method of rare earth in pre-oxidation and soft nitriding technology Download PDFInfo
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- CN104789923A CN104789923A CN201410023672.4A CN201410023672A CN104789923A CN 104789923 A CN104789923 A CN 104789923A CN 201410023672 A CN201410023672 A CN 201410023672A CN 104789923 A CN104789923 A CN 104789923A
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Abstract
The invention discloses an application method of rare earth in a pre-oxidation and soft nitriding technology, and relates to a new rare earth accelerant added pre-oxidation and soft nitriding technology. The technology comprises the following steps: pre-oxidizing in a 90kW pit gas carburizing furnace at 450DEG C for 0.5h; heating to 570DEG C; and carrying out a soft nitriding process: adding the rare earth accelerant into the furnace in a dropwise manner according to a rate of 8ml/min through a rare earth accelerant mixed liquid drop injecting device, introducing ammonia gas according to a rate of 12ml/min to make the pressure in the furnace not lower than 100Pa, sampling about 3h later, determining the effect of the above treatment process, and determining the end time of the process. The method has the advantages of simplicity, easy knowing, wide source of the rare earth raw material, and substantial economic benefit.
Description
Technical field
What the present invention relates to is a kind of preoxidation tufftride new technology of adding rare-earth energizer, is applicable to the thermo-chemical treatment of metallic surface, is specifically related to the application method of a kind of rare earth in preoxidation soft-nitriding process.
Background technology
So-called chemistry urges that to ooze be utilize certain chemical reaction activation to be oozed workpiece surface substantially, improves furnace gas quality.For general chemical catalytic cementation technology, its emphasis is the composition or the quality that change furnace gas, accelerates the activity of surface reaction, but the inherent structural state by oozing steel matrix can not be made to change.And be easy to produce vein structure in conventional nitridation, nitride easily along crystal boundary accumulation, once surface hardness improves, often may make fragility increase.
Summary of the invention
For the deficiency that prior art exists, the present invention seeks to be to provide the application method of a kind of rare earth in preoxidation soft-nitriding process, processing method is simple, is easy to grasp, rare earths material wide material sources, remarkable in economical benefits.
To achieve these goals, the present invention realizes by the following technical solutions: the application method of rare earth in preoxidation soft-nitriding process, its processing step is: preoxidation 0.5 hour under 450 DEG C of conditions in the pit gas carburizing furnace of 90kW, then be heated to 570 DEG C and carry out soft-nitriding process process: in stove, instill rare-earth energizer 8ml/min and ammonia 12ml/min by rare-earth energizer mixed solution drop instillator, maintain Lu Nei≤100Pa, sample determination processing technological effect after about 3 hours and determine the process ends time.
Described rare-earth energizer mixed solution is that the compound adding 8 grams of ceriums (Ce) in 1 liter of methanol solution stirs stand-by.
Described pre-oxidation process flow process is: by workpiece vanning-cleaning-shove charge-pre-oxidation treatment (under 450 DEG C of conditions, pass into ~ the air of 10 ls/h, be incubated 0.5 hour)--pre-oxidation process terminates.
Described soft-nitriding process flow process is: pre-oxidation process terminate-be warming up to 570 DEG C-in stove, pass into rare-earth energizer and ammonia by instillation system, maintain 10mm water column positive pressure, sample determination processing technological effect after about 3 hours and determine process ends time-come out of the stove-oil in cooling-examination and test of products.
Described mixed solution drop instillator comprises variable valve housing 1, variable valve speed governing axle 2, regulating valve cap nut lid 3, variable valve joint 4, sealing-ring 5, variable valve housing 6, comprehensive water dropper 7, first adapter sleeve 8, cooling tube 9 and the second adapter sleeve 10, cooling tube 9 two ends are connected to the first adapter sleeve 8 and the second adapter sleeve 10, first adapter sleeve 8 is connected with comprehensive water dropper 7 by sealing-ring 5, comprehensive water dropper 7 is connected with variable valve housing 6 by sealing-ring 5, variable valve speed governing axle 2 is located in variable valve housing 6, and variable valve speed governing axle 2 outer setting has variable valve housing 1, variable valve housing 1 outer end is connected with regulating valve cap nut lid 3, variable valve housing 1 is inner fastening by soldering with variable valve housing 6, variable valve housing 1 is also provided with variable valve joint 4.
The present invention compares with conventional tufftride, and infiltration rate is obviously accelerated, can by tufftride time shorten 80 ~ 120%; Workpiece surface hardness improves 50 ~ 200HV relatively, wear resistance, resistance to corrosion, and metallographic structure is improved in varying degrees, and nitrided layer hardness distribution is mild, and Brittleness reduces, and part life improves 1 ~ 2 times.Meanwhile, present invention process method is simple, is easy to grasp, rare earths material wide material sources, therefore, and remarkable in economical benefits.
Accompanying drawing explanation
The present invention is described in detail below in conjunction with the drawings and specific embodiments;
Fig. 1 is the structural representation of the mixed solution drop instillator in the present invention.
Embodiment
The technique means realized for making the present invention, creation characteristic, reaching object and effect is easy to understand, below in conjunction with embodiment, setting forth the present invention further.
With reference to Fig. 1, this embodiment is by the following technical solutions: the application method of rare earth in preoxidation soft-nitriding process, its processing step is: preoxidation 0.5 hour under 450 DEG C of conditions in the pit gas carburizing furnace of 90kW, then be heated to 570 DEG C and carry out soft-nitriding process process: in stove, instill rare-earth energizer 8ml/min and ammonia 12ml/min by rare-earth energizer mixed solution drop instillator, maintain Lu Nei≤100Pa, sample determination processing technological effect after about 3 hours and determine the process ends time.
Described rare-earth energizer mixed solution is that the compound adding 8 grams of ceriums (Ce) in 1 liter of methanol solution stirs stand-by.
Described pre-oxidation process flow process is: by workpiece vanning-cleaning-shove charge-pre-oxidation treatment (under 450 DEG C of conditions, pass into ~ the air of 10 ls/h, be incubated 0.5 hour)--pre-oxidation process terminates.
Described soft-nitriding process flow process is: pre-oxidation process terminate-be warming up to 570 DEG C-in stove, pass into rare-earth energizer and ammonia by instillation system, maintain 10mm water column positive pressure, sample determination processing technological effect after about 3 hours and determine process ends time-come out of the stove-oil in cooling-examination and test of products.
Described mixed solution drop instillator comprises variable valve housing 1, variable valve speed governing axle 2, regulating valve cap nut lid 3, variable valve joint 4, sealing-ring 5, variable valve housing 6, comprehensive water dropper 7, first adapter sleeve 8, cooling tube 9 and the second adapter sleeve 10, cooling tube 9 two ends are connected to the first adapter sleeve 8 and the second adapter sleeve 10, first adapter sleeve 8 is connected with comprehensive water dropper 7 by sealing-ring 5, comprehensive water dropper 7 is connected with variable valve housing 6 by sealing-ring 5, variable valve speed governing axle 2 is located in variable valve housing 6, and variable valve speed governing axle 2 outer setting has variable valve housing 1, variable valve housing 1 outer end is connected with regulating valve cap nut lid 3, variable valve housing 1 is inner fastening by soldering with variable valve housing 6, variable valve housing 1 is also provided with variable valve joint 4.
The energizer of this embodiment is the rare earth containing cerium.Because rare earth has strong chemically reactive without element, corresponding compound can be formed to oxygen, hydrogen, nitrogen effect, and the decomposition of nitrogen, hydrogen compound can be accelerated, therefore, workpiece is loaded after in nitriding furnace, early stage, first by pre-oxidation process, then carries out the tufftride mixed solution added in stove containing rare-earth energizer, can realize rare earth catalytic cementation soft nitriding technique.
Because the infiltration of rare earth is disperse uneven distribution in rare earth nitrogenize, and become the trap of interstitial atom, so the N infiltrated becomes forming core core, make the disperse that the distribution of N also becomes, and it is spherical that the nitride produced is the standard of disperse, doing so avoids the segregation of nitride along crystal boundary and the generation of vein structure, greatly improve surface hardness, and its fragility also remains on 0-1 grade.
Rare earth catalytic cementation soft nitriding is to the requirement of technique:
According to the feature of rare earth preoxidation tufftride nitrogenize, tufftride temperature can be improved 10-20 DEG C, make it more effective raising infiltration rate.
Test proves that application preoxidation adds 570 DEG C of temperature rare earth tufftrides and infiltration rate can only be made to improve 25-50%, and after tufftride temperature is improved 20 DEG C, infiltration rate can be made to increase substantially, such as 45 steel tufftrides, obtain the infiltration layer of 0.3mm, conventional needs 12 hours, and only can complete with 6 hours after adopting preoxidation and rare earth tufftride, infiltration rate improves more than 100%.
When adopting preoxidation and rare earth tufftride with conventional tufftride equally effective control nitrogenize ammonia dissociation rate, in the nitrogen gesture (Np) that initial stage employing is higher, and progressively reduce thereupon.
This embodiment adopts the pit gas carburizing furnace of equipment 90kW, special tightness system, special rare-earth energizer mixed solution instillation system and temperature control intelligent instrument, carry out the test of more than 20 heats, determine best rare earth and add consumption, best pre-oxidation process temperature and soft-nitriding process temperature; Its test materials is 45 steel, paper examines gear shifting quadrant texturing, urges and oozes effect and organizational controls.Result shows that gear shifting quadrant texturing qualification rate brings up to 99% by original 80%, tufftride time shorten 80 ~ 120%; Workpiece surface hardness improves 50 ~ 200HV relatively, wear resistance, resistance to corrosion, and metallographic structure is improved in varying degrees, and nitrided layer hardness distribution is mild, and Brittleness reduces, and part life improves 1 ~ 2 times.
This embodiment processing method is simple, is easy to grasp, rare earths material wide material sources, remarkable in economical benefits.
1, the participation tufftride of rare earth can effectively improve furnace gas quality, improves surface reaction active, has urge same with other energizer and ooze effect.
2, rare earth is most important urges the effect of oozing to be to be formed with the interstitial element such as carbon, nitrogen and to ooze altogether, and makes to be oozed matrix defect concentration and breed.This characteristic is that general catalytic cementation technology is difficult to realize.
3, defect concentration propagation can cause permeance coefficient and spread coefficient to improve, and make that the infiltration concentration of interstitial atom increases, nitrided layer hardness increase, its result can make infiltration rate significantly improve.
4, because the infiltration of rare earth can make formed carbide or nitride refinement and Dispersed precipitate, thus make diffusion layer organization refinement or super-refinement, penetrated layer property is increased substantially, and then improves mechanical property and the work-ing life of product.
More than show and describe ultimate principle of the present invention and principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and specification sheets just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.Application claims protection domain is defined by appending claims and equivalent thereof.
Claims (5)
1. the application method of rare earth in preoxidation soft-nitriding process, it is characterized in that, its processing step is: preoxidation 0.5 hour under 450 DEG C of conditions in the pit gas carburizing furnace of 90kW, then be heated to 570 DEG C and carry out soft-nitriding process process: in stove, instill rare-earth energizer 8ml/min and ammonia 12ml/min by rare-earth energizer mixed solution drop instillator, maintain Lu Nei≤100Pa, sample determination processing technological effect after about 3 hours and determine the process ends time.
2. the application method of rare earth according to claim 1 in preoxidation soft-nitriding process, is characterized in that, described rare-earth energizer mixed solution is that the compound adding 8 grams of ceriums in 1 liter of methanol solution stirs stand-by.
3. the application method of rare earth according to claim 1 in preoxidation soft-nitriding process, is characterized in that, described pre-oxidation process flow process is: by workpiece vanning-cleaning-shove charge-pre-oxidation treatment--pre-oxidation process terminates.
4. the application method of rare earth according to claim 1 in preoxidation soft-nitriding process, it is characterized in that, described soft-nitriding process flow process is: pre-oxidation process terminate-be warming up to 570 DEG C-in stove, pass into rare-earth energizer and ammonia by instillation system, maintain 10mm water column positive pressure, sample determination processing technological effect after about 3 hours and determine process ends time-come out of the stove-oil in cooling-examination and test of products.
5. the application method of rare earth according to claim 1 in preoxidation soft-nitriding process, it is characterized in that, described mixed solution drop instillator comprises variable valve housing (1), variable valve speed governing axle (2), regulating valve cap nut lid (3), variable valve joint (4), sealing-ring (5), variable valve housing (6), comprehensive water dropper (7), first adapter sleeve (8), cooling tube (9) and the second adapter sleeve (10), cooling tube (9) two ends are connected to the first adapter sleeve (8) and the second adapter sleeve (10), first adapter sleeve (8) is connected with comprehensive water dropper (7) by sealing-ring (5), comprehensive water dropper (7) is connected with variable valve housing (6) by sealing-ring (5), variable valve speed governing axle (2) is located in variable valve housing (6), and variable valve speed governing axle (2) outer setting has variable valve housing (1), variable valve housing (1) outer end is connected with regulating valve cap nut lid (3), variable valve housing (1) is inner fastening by soldering with variable valve housing (6), variable valve housing (1) is also provided with variable valve joint (4).
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| CN201410023672.4A CN104789923A (en) | 2014-01-20 | 2014-01-20 | Application method of rare earth in pre-oxidation and soft nitriding technology |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106367711A (en) * | 2016-08-31 | 2017-02-01 | 重庆铁马工业集团有限公司 | Novel nitriding process |
| CN106399917A (en) * | 2016-12-09 | 2017-02-15 | 贵州西南工具(集团)有限公司 | Surface nitriding treatment process of hard alloy cutter |
| CN118422111A (en) * | 2024-07-05 | 2024-08-02 | 有研工程技术研究院有限公司 | Refractory metal surface chemical modification catalyst and surface chemical modification method thereof |
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| CN1039069A (en) * | 1988-07-05 | 1990-01-24 | 哈尔滨工业大学 | Solid-liquid rare earth chemistry thermal treatment energizer and compound method |
| CN101886241A (en) * | 2009-05-14 | 2010-11-17 | 上海纳铁福传动轴有限公司 | Heat treatment nitridation technology for metal |
| CN102230151A (en) * | 2011-07-20 | 2011-11-02 | 新大洲本田摩托有限公司 | Heat treatment process of metal workpiece |
| CN102373400A (en) * | 2011-10-25 | 2012-03-14 | 哈尔滨汇隆汽车箱桥有限公司 | Heat treatment method of spiral bevel gear of cargo truck on double-row rare earth carburization equipment |
| CN102373404A (en) * | 2011-10-25 | 2012-03-14 | 哈尔滨汇隆汽车箱桥有限公司 | Water-cooling anti-coking instilling and nitrogen blocking removing device of double-row rare earth gas carburizing furnace |
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2014
- 2014-01-20 CN CN201410023672.4A patent/CN104789923A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1039069A (en) * | 1988-07-05 | 1990-01-24 | 哈尔滨工业大学 | Solid-liquid rare earth chemistry thermal treatment energizer and compound method |
| CN101886241A (en) * | 2009-05-14 | 2010-11-17 | 上海纳铁福传动轴有限公司 | Heat treatment nitridation technology for metal |
| CN102230151A (en) * | 2011-07-20 | 2011-11-02 | 新大洲本田摩托有限公司 | Heat treatment process of metal workpiece |
| CN102373400A (en) * | 2011-10-25 | 2012-03-14 | 哈尔滨汇隆汽车箱桥有限公司 | Heat treatment method of spiral bevel gear of cargo truck on double-row rare earth carburization equipment |
| CN102373404A (en) * | 2011-10-25 | 2012-03-14 | 哈尔滨汇隆汽车箱桥有限公司 | Water-cooling anti-coking instilling and nitrogen blocking removing device of double-row rare earth gas carburizing furnace |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106367711A (en) * | 2016-08-31 | 2017-02-01 | 重庆铁马工业集团有限公司 | Novel nitriding process |
| CN106399917A (en) * | 2016-12-09 | 2017-02-15 | 贵州西南工具(集团)有限公司 | Surface nitriding treatment process of hard alloy cutter |
| CN118422111A (en) * | 2024-07-05 | 2024-08-02 | 有研工程技术研究院有限公司 | Refractory metal surface chemical modification catalyst and surface chemical modification method thereof |
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