CN1061050A - The quick fumigating cementation method of iron and steel parts nitriding - Google Patents
The quick fumigating cementation method of iron and steel parts nitriding Download PDFInfo
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- CN1061050A CN1061050A CN 91111528 CN91111528A CN1061050A CN 1061050 A CN1061050 A CN 1061050A CN 91111528 CN91111528 CN 91111528 CN 91111528 A CN91111528 A CN 91111528A CN 1061050 A CN1061050 A CN 1061050A
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- penetration enhancer
- smoked
- smoking
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Abstract
The invention belongs to metallic surface thermo-chemical treatment technology.Method of the present invention be certain high nitrogen compound as smoked penetration enhancer, with workpiece and the smoked penetration enhancer smoked case that oozes of packing into simultaneously, smoked penetration enhancer distillation and coat workpiece when heating, the activated nitrogen atom that its catalytic decomposition produces is absorbed and forms the method for infiltration layer by workpiece.Present method is better than the conventional gas nitriding, time weak point, penetration enhancer province, effective.Generally can obtain compound layer thickness in 10-60 minute and reach 35-210 μ m 500-900 ℃ of smoked oozing.Present method can be utilized conventional Equipment for Heating Processing, can be used for continuous production line and vacuum nitriding, also can be used in combination with technologies such as conventional solid, gas nitriding or carbonitridings.
Description
The invention belongs to metallic surface thermo-chemical treatment technology.Method of the present invention is different from traditional gas nitriding, and gas nitriding is to utilize NH
3And NH
3+ N
2Gas in nitriding furnace thermolysis and make workpiece surface obtain the method for nitride layer.Method of the present invention is to utilize a kind of sublimable high nitrogen compound, makes it all " aerosolization " and is deposited on workpiece surface by heating, and again by the catalytic decomposition on workpiece surface, the activated nitrogen atom that makes generation infiltrates workpiece and obtains the method for nitride layer.This technology is referred to as " smoked oozing " according to these characteristics.The present invention is melam, melem and melon as the high nitrogen compound of smoked penetration enhancer, and above-mentioned substance is commonly referred to as melamine polymers.
Background of invention
All are public up to now, its layer surface has the traditional nitriding and the nitrogen-carbon cocementing process of ε-phase compound layer feature, no matter be gas method, liquid method or solid process, because of treatment temp is no more than 570 ℃, when treatment temp was in 1-4 hour scope, the general compound layer thickness that obtains was no more than 30 μ m.Its part typical process and compound layer thickness thereof are listed in table 1.Table 1 data are of universal significance, and match with present practical application both domestic and external
The comparison of table 1. part typical case's nitrogen-carbon cocementing process and infiltration layer
| Each claims technology | Penetration enhancer | Treatment temp | Treatment time | Compound layer thickness | Document |
| FON technology | NaCNO | 570℃ | 1h | 13-28μm | [1] |
| Nitemper technology | 50%NH 3+ 50% heat absorption type gas | 570℃ | 3h | 18μm | [2] |
| Triniding technology | 20％NH 3+30%N 2? | 570℃ | 4h | 12μm | [2] |
| Gorodetsky technology | Polymeric amide | 480- 680℃ | 2-4h | 0μm | [3] |
* the diffusion layer degree of depth is 60-90 μ m
[1] Federation of Literary and Art Circles's illuminate etc., the research of FON technology and application.Tianjin knitter institute journal, No.4 in 1989, p113-121.
[2]C.Dawes et al.A Re-Appraisal of Nitrocarburizing and Nitriding With Applied to the Design and Manufacture of Non-Alloy Steel Automobile Components，Journal of Heat Treating，Vol.1，No.2，December 1979，p30-42.
[3]D.B.Gorodetsky et al，Method of Low Temperature Nitrocarburizing of Steel Articles，European Patent No.EP0323511，Convention date 16 June 1987.
Mirror is by obtaining the hard nitride of one deck rather than leaning on martensite transformation with the reinforcement of workpiece surface when nitriding and carbonitriding, the austenite eutectoid temperature is 590 ℃ on the Fe-N binary system phase diagram, austenitic eutectoid point is 565 ℃ on Fe-N-C three component system phasor, thereby the treatment temp of traditional technology is from 570 ℃ of insurmountabilities.In addition, a prior practical difficulty is nitriding medium.For example ammonia almost be the main body penetration enhancer that all traditional gas nitridings and gas nitrogen-carbon cocementing process are adopted, and the thermostability of ammonia is relatively poor, accelerates with the decomposition rate of temperature rising ammonia, at 500 ℃ of left and right sides NH
3Basically be decomposed into N
2+ H
2, the activated nitrogen atom that is generated in decomposition course [N] can enter iron and steel parts and form nitride layer.But activated nitrogen atom also very easily is combined into N
2, and N
2Be quite stable, usually can not be by N
2Decomposition obtains [N], so when treatment temp is too high, mean NH
3Before arriving workpiece surface, decompose in advance, lost the nitriding ability that is had.
In a word, temperature is low, the time is long, infiltration layer is thin is the characteristics and the problem of traditional nitriding and nitrogen-carbon cocementing process.The objective of the invention is to overcome above-mentioned shortcoming, so that propose the effect that new technical scheme obtains " temperature height, the time is short, infiltration layer is thick ".
The present invention's general introduction
For solving the problem that above-mentioned conventional art exists, one of feature of technical solution of the present invention is to adopt fumigating cementation method.Promptly adopt high nitrogen compound to make smoked penetration enhancer, smoked penetration enhancer all " aerosolization " in heat-processed, and finish the process of distillation-deposition-coating workpiece simultaneously.Stick to the formed coating of smoked penetration enhancer or the film of workpiece surface, can be on workpiece surface catalytic decomposition, provide activated nitrogen atom [N] to workpiece, again workpiece is had the provide protection-anti-oxidation and the decarburization of machinery and chemistry.
Another feature of technical solution of the present invention is to adopt melamine polymers to make smoked penetration enhancer.Melam (melam), melem (melem) and melon (melon) they all are known melamine polymers, referring to " Kirk-Othmer Encyclopedia of Chemical Technology " the 2nd edition, and the 6th volume, the 571st page.Under normal temperature and pressure conditions, above-mentioned substance is white agglomerate or powder, and chemical property is highly stable, does not contain poisonous or hazard component.Compare with the nitriding medium that traditional technology is used, have following three characteristics as the melamine polymers of smoking penetration enhancer:
1. nitrogen content height is referring to table 2;
2. can distil under condition of normal pressure, no fusing point is heated to 350 ℃ of melams, melems and begins distillation, is heated to 600 ℃ of melons and begins distillation.Under the lasting heating condition more than 700 ℃, melam, melem, melon all can all distil and not stay residual substance.
3. melam, melem and melon all have firm triazine ring on molecular structure, thereby heat decomposition temperature is higher than materials such as ammonia and polyamine.
Compare with traditional technology, technical scheme of the present invention has the nitriding temperature height, and the treatment time, infiltration layer short, that obtain was thick, and advantage such as operation of equipment is simple.Under condition of different temperatures, implement technical solution of the present invention, handled 60 minutes, obtainable ε-phase compound bed thickness
Specific practice of the present invention
Implementing optimal technical solution of the present invention is, processed workpiece packed into one together with the smoked penetration enhancer that accounts for workpiece weight 5.0-0.1% be called as the smoked sealed vessel that oozes case, it is smoked, and to ooze the relative processed workpiece of case volume should be minimum, smokedly oozes case and the case lid that can open flexibly should be arranged and be convenient to workpiece loading and unloading.Smoked ooze temperature and can be selected in 500-900 ℃ of scope, plain carbon stool is advisable with 700 ℃.Soaking time is 10-60 minute.The injected volume of smoked penetration enhancer is general relevant with the surface-area of treatment temp and processed workpiece, and treatment temp is high more, and the surface-area of processed workpiece is big more, and then the smoked penetration enhancer of required consumption is just many more.
For improving the yield strength and the fatigue strength of processed workpiece, the workpiece behind nitriding or the carbonitriding should directly be quenched in oil or the water.
The embodiment that further specifies technical solution of the present invention is as follows:
Embodiment 1
Material: be respectively pure iron, 20 steel and 60 steel
Workpiece weight and size: the length of side is the cuboid sample of 20mm, and weight is 60.8 grams
Smoked penetration enhancer injected volume: 100 grams account for 0.7% of batch
Smoke and ooze case: inner cavity size is φ 150 * 150mm titanium jar
Electric furnace: common 20kw experiment resistance furnace
Smoked cementation process: be heated to 700 ℃ and be incubated 60 minutes, then oil cooling
Result: the compound layer thickness of pure iron is 75 μ m, and microhardness is HV552.8; The compound layer thickness of 20 steel is 40 μ m, and microhardness is HV802.4; The compound layer thickness of 60 steel is 67 μ m, and microhardness is that HV643.8(annotates: the load of test microhardness is all 200 grams)
Embodiment 2
Material: 60 steel
Workpiece weight and size: the length of side is the cuboid sample of 20mm, and weight is 60.8 grams
Smoked penetration enhancer injected volume: 100 grams account for 0.7% of batch
Smoke and ooze case: inner cavity size is φ 150 * 150mm titanium jar
Electric furnace: common 20kw test resistance stove
Smoked cementation process: be heated to 800 ℃ and be incubated 10 minutes, then oil cooling
Result: compound layer thickness is 125 μ m, and microhardness is that HV643.8(annotates: the load of test microhardness is 200 grams)
Claims (12)
1, method of the present invention is to adopt melamine polymers to make smoked penetration enhancer, with workpiece and the smoked penetration enhancer smoked case that oozes of packing into simultaneously, and smoked penetration enhancer distillation and coat workpiece when heating, the activated nitrogen atom that its catalytic decomposition produces is absorbed and forms the method for infiltration layer by workpiece.
2,, comprise melon ((C as the melamine polymers of smoking penetration enhancer according to claim 1
6H
3N
9)
n).
3,, comprise melem (C as the melamine polymers of smoking penetration enhancer according to claim 1
6H
6N
10).
4,, comprise melam (C as the melamine polymers of smoking penetration enhancer according to claim 1
6H
9N
11).
5, method of the present invention is combined with traditional method.Specific practice is: in traditional solid, gas nitriding, and solid, gas nitrocarburizing, even in the solid, gas carbonitriding technology, by adding the method for smoked penetration enhancer melamine polymers, improve infiltration rate, increase alloying layer thickness, and improve penetrated layer property.
6,, comprise melon ((C as the melamine polymers of smoking penetration enhancer according to claim 5
6H
3N
9)
n).
7,, comprise melem (C as the melamine polymers of smoking penetration enhancer according to claim 5
6H
6N
10).
8,, comprise melam (C as the melamine polymers of smoking penetration enhancer according to claim 5
6H
9N
11).
9, need not smoke and ooze case,,, carry out the method for nitriding treatment as box-type furnace, bell furnace, pit furnace, tube furnace and vacuum oven etc. with directly pack into the heat treatment furnace of all kinds good seal of workpiece and the excessive smoked penetration enhancer of melamine polymers.
10,, comprise melon ((C as the melamine polymers of smoking penetration enhancer according to claim 9
6H
3N
9)
n).
11,, comprise melem (C as the melamine polymers of smoking penetration enhancer according to claim 9
6H
6N
10).
12,, comprise melam (C as the melamine polymers of smoking penetration enhancer according to claim 9
6H
9N
11)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91111528 CN1032316C (en) | 1991-12-14 | 1991-12-14 | Repid fumigating cementation method for nitriding iron steel working pieces |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91111528 CN1032316C (en) | 1991-12-14 | 1991-12-14 | Repid fumigating cementation method for nitriding iron steel working pieces |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1061050A true CN1061050A (en) | 1992-05-13 |
| CN1032316C CN1032316C (en) | 1996-07-17 |
Family
ID=4910687
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91111528 Expired - Fee Related CN1032316C (en) | 1991-12-14 | 1991-12-14 | Repid fumigating cementation method for nitriding iron steel working pieces |
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| Country | Link |
|---|---|
| CN (1) | CN1032316C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100425737C (en) * | 2006-08-24 | 2008-10-15 | 李亚明 | Chemical heat treatment method for steel surface |
| CN105420650A (en) * | 2015-11-10 | 2016-03-23 | 洛阳惠尔纳米科技有限公司 | Hardening process for gold product |
| WO2020098667A1 (en) * | 2018-11-14 | 2020-05-22 | 王静然 | Treatment method for soft magnetic metallic materials |
-
1991
- 1991-12-14 CN CN 91111528 patent/CN1032316C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100425737C (en) * | 2006-08-24 | 2008-10-15 | 李亚明 | Chemical heat treatment method for steel surface |
| CN105420650A (en) * | 2015-11-10 | 2016-03-23 | 洛阳惠尔纳米科技有限公司 | Hardening process for gold product |
| WO2020098667A1 (en) * | 2018-11-14 | 2020-05-22 | 王静然 | Treatment method for soft magnetic metallic materials |
| CN113015820A (en) * | 2018-11-14 | 2021-06-22 | 王静然 | Processing method of soft magnetic metal material |
| US12071695B2 (en) | 2018-11-14 | 2024-08-27 | Jingran WANG | Method for increasing magnetic induction intensity of soft magnetic metallic materials |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1032316C (en) | 1996-07-17 |
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