CN1025440C - Low temp. salt bath vanadium-nitride co-permeate technology (MN) - Google Patents
Low temp. salt bath vanadium-nitride co-permeate technology (MN) Download PDFInfo
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- CN1025440C CN1025440C CN 92102623 CN92102623A CN1025440C CN 1025440 C CN1025440 C CN 1025440C CN 92102623 CN92102623 CN 92102623 CN 92102623 A CN92102623 A CN 92102623A CN 1025440 C CN1025440 C CN 1025440C
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- vanadium
- salt bath
- helium
- layer
- nitride
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Abstract
The present invention relates to a new chemical heat treatment process by which vanadium and nitrogen co-permeation is realized in salt bath with no pollution under the condition that the temperature is below 620 DEG C. After vanadium and nitrogen co-permeation treatment, iron or iron alloy workpieces can obtain 2 to 25 micrometers of vanadium and nitrogen co-permeation layers; with the co-permeation layers, the workpiece has the comprehensive abrasion resistance of greasy lubrication abrasion resistance, adhesive abrasion resistance (seizure resistance and galling resistance). The present invention has the characteristics of simple equipment, low energy consumption, high efficiency, little workpiece deformation and wide application prospect.
Description
The invention belongs to the thermo-chemical treatment field.
The wearing character of material is not a material institute inherent characteristic, but the overall characteristic of material, pair materials and working conditions.Therefore, the maximum potential that improves the secondary wear resistance of machine friction is to improve its comprehensive wear resistance, i.e. the ability of anti-multiple wear form, yet existing many wear-resisting measures can't satisfy above-mentioned requirements, the time regular meeting situation that occurs attending to one thing and lose sight of another.Just as, though the vanadinizing layer that salt bath vanadizing obtained has good wear-resistant material wearing character, anti-adhesive wear poor performance, and treatment temp height (800～1000 ℃) workpiece deformation is big; Though salt bath helium layer has good anti-adhesive wear, the dead performance of anti-bite, wear-resisting material abrasion characteristic is very poor; In order to improve the comprehensive wear resistance of material, people have carried out many research work aspect material processing.Various confusion technologies and composite cementation technology have been developed to ooze helium.
Europe is applied for a patent " iron or the iron alloy workpiece surface method for curing " that No.122529 delivers and has been reported iron or iron alloy elder generation heliumization, V in containing the periodic table of elements again.In the borax salt bath of family's element, under 1000 ℃ of situations, carry out composite cementation, can make workpiece obtain to contain V.The carbon helium compisite seeping layer of element.This recombining process exists complex procedures, treatment temp height, the yielding shortcoming of part.
" the low temperature salt-bath vanadium helium carbon composite cementation technology " that United States Patent (USP) (US pat No 23.862) is delivered has reported iron or the iron alloy workpiece oozes helium earlier, vanadinizing in containing the muriate salt bath at vanadium powder end again, obtain vanadium helium carbon compisite seeping layer, but complex procedures, and depth of penetration is subjected to the restriction of former process.
" iron or the iron alloy workpiece surface treatment process " that United States Patent (USP) NO 481835 delivers reported that iron or iron alloy workpiece are lower than and carried out vanadium helium carbon under 650 ℃ of situations and ooze altogether in containing the cyanogen salt of vanadium, cyanate, in temperature, can obtain vanadium helium carbon co-penetration layer, but salt bath exists pollution problem.
The patent of invention (89.108123.2) " low temperature salt-bath vanadium helium sulphur common seeping technology " of the applicant's application in 1989 can obtain the vanadium helium sulphur infiltration layer that comprehensive wear resistance is better than the sulphidizing layer, it is that a kind of piece surface that is applicable to allows the treatment process of sulfur-bearing, yet, also have a large amount of wear parts not allow surperficial sulfur-bearing.For fear of sulphur, if the sulfide in the work salt bath that will invent removes, but composition and the processing condition that can not continue to use this invention system obtain the vanadium-nitride co-permeating layer, to improve the comprehensive wear resistance of helium layer, therefore, this invention is not suitable for processing, and those do not allow the part of surperficial sulfur-bearing, and limit to some extent.For this reason, the present invention proposes to obtain the novel process that comprehensive wear resistance is better than helium layer and don't sulfur-bearing.
Obtain the vanadium-nitride co-permeating layer owing to can not follow the applicant's above-mentioned patent application simply.So the present invention proposes new activated channel.Realize vanadium-nitride co-permeating by developing the new vanadium additive that contains, thereby obtain the nitriding treatment novel process that the comprehensive wear resistance of infiltration layer is better than having a large capacity and a wide range.
The objective of the invention is to develop a kind of in pollution-free salt bath, can implement at low temperature, with anti-boundary lubrication wearing and tearing, wear-resistant material wearing and tearing, the thermo-chemical treatment co-penetration layer of anti-adhesive wear comprehensive tribological properties such as (dead, the scratches of anti-bite).The present invention proposes a kind of pollution-free low temperature vanadium helium confusion technology.
Vanadium helium confusion technology of the present invention is characterised in that: ooze the work salt bath altogether and oozed basic salt (code name MN-G) altogether and accounted for basic salt bath 5-15%(weight % by the pollution-free vanadium helium with certain activity and stability) can guarantee that active vanadium atom infiltrates containing vanadium additive (code name MN-T) and recovering and adjust the active regenerant salt of vanadium helium co-diffused salt bath (MN-Z) and form of metal surface at low temperatures.
Said vanadium helium oozes work salt bath basis salt composition scope (by heavy %) altogether:
K
2CO
330-40%
Na
2CO
310-25%
（NH
2）
2CO 20-40%
LiCO
33-7%
The said composition scope that contains vanadium additive % by weight is:
5-50% vanadium compound+95-50%[25-35%NaCl+55-65%CaCl
2+ 5-15%(NaF+KCl+KBF
4];
Its preparation technology is:
680 ℃-820 ℃ of range of reaction temperature
Reaction time range 35-50 hour
Addition in salt bath is by basic salt bath weight 5-15%.
Said regenerant salt is the reactant of urea.
Oozing temperature altogether is 520 ℃-620 ℃, adopt the crucible of common external-heat resistance furnace and 1Cr18Ni9Ti or Ti system to ooze processing altogether to workpiece, according to particular cases such as fused salt weight and workpiece batches, whenever worked 24-48 hour continuously or totally, with regenerant salt and contain vanadium additive adjustment work salt bath once, to guarantee the workpiece quality layer.
Ooze 45 steel of processing altogether by the present invention, alloying layer thickness is the 2-25 micron, nitrided layer hardness HV
0.025463～713, this infiltration layer has vanadium to infiltrate through esca analysis and XPS analysis proof, with electronic scanning its stable wear stage polishing scratch surface is detected to confirm to have v element to infiltrate.
Advantage of the present invention is:
1, low, the part base solid of treatment temp does not have phase transformation, and deflection is little.
2, the CN concentration in the co-diffused salt bath can be controlled in below 0.8%, can realize pollution-free operation.
3, to ooze heliosphere finer and close for the vanadium helium co-penetration layer of gained.Evenly, continuously, and have the wearing and tearing of good anti-boundary lubrication wearing and tearing, wear-resistant material, comprehensive Tribology performances such as anti-adhesive wear (anti-bite is dead, anti scuffing).
4, the comprehensive tribological property of the vanadium helium co-penetration layer of gained is better than salt bath helium layer.
5, equipment is simple, energy consumption is low, be convenient to realize automated job.
Description of drawings
Fig. 1 is the distribution with the present invention's of Auger spectroscopy analysis co-penetration layer vanadium, helium, iron, carbon.
Fig. 2 is the XPC analytical results of 45 steel vanadium helium co-penetration layers.
Fig. 3 distributes with the face that electronic scanning detects its v element to the stable wear stage polishing scratch surface of the present invention's co-penetration layer.
Fig. 4 is the metallographic structure photo (magnification is * 500) of embodiment 1.
Fig. 5 is the metallographic structure photo (magnification is * 500) of embodiment 2.
Fig. 6 is the metallographic structure photo (magnification is * 500) of embodiment 3.
Embodiment 1
The processing material is: No. 45 steel
The salt bath composition is:
MN-G：K
2CO
330%;Na
2CO
325%;（NH
2）
2CO40%;LiCO
35%
MN-T：×10%（MN-G）
Treatment condition: 570 ℃ * 8hr
Result: 6～8 microns of the infiltration layer compound layer degree of depth
Relative wear resistance (comparing) with salt bath heliumization
Anti-boundary lubrication wearing and tearing ε=4.5
Wear-resistant material wearing and tearing ε=2.6
Anti scuffing ε=1.67
The processing material is: 40Cr
The salt bath composition is:
MN-G：K
2CO
335%;Na
2CO
320%;（NH
2）
2CO40%;Li
2CO
35%;
MN-T：×15%（MN-G）
Treatment process: 570 ℃ * 8hr
Result: 2～2.5 microns of the infiltration layer compound layer degree of depth
Relative wear resistance (comparing) with salt bath heliumization
Anti-boundary lubrication wearing and tearing ε=3.2
Wear-resistant material wearing and tearing ε=1.94
Anti scuffing ε=1.28
Embodiment 3
Handling material is No. 45 steel
The salt bath composition is
MN-G：K
2CO
333%;Na
2CO
322%;（NH
2）
2CO40%;Li
2CO
35%
MN-T：×15%（MN-G）
Treatment condition: 570 ℃ * 8hr
Result: 10～10.5 microns of the infiltration layer compound layer degree of depth
Relative wear resistance (comparing) with salt bath heliumization:
Anti-boundary lubrication wearing and tearing ε=5.6
Wear-resistant material wearing and tearing ε=2.95
Anti scuffing ε=1.85
Claims (1)
1, a kind of pollution-free vanadium-nitride co-permeating salt bath is characterized in that oozing altogether the work salt bath by basic salt K
2CO
330～40%, Na
2CO
310～25%, (NH
2)
2CO20～40%, Li
2CO
33～7% and the vanadium additive that contains that accounts for basic salt 5～15% form (being weight %), contain mixture [25～35%NaCl+55～65%CaCl that vanadium additive consists of 5～50% vanadium compound+95～50% halogen compounds
2+ 5～15% (NaF+KCl+KBF
4)], containing the vanadium additive temperature of reaction is 680 ℃～820 ℃, containing the vanadium additive reaction times is 35～50 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92102623 CN1025440C (en) | 1992-04-08 | 1992-04-08 | Low temp. salt bath vanadium-nitride co-permeate technology (MN) |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92102623 CN1025440C (en) | 1992-04-08 | 1992-04-08 | Low temp. salt bath vanadium-nitride co-permeate technology (MN) |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1066891A CN1066891A (en) | 1992-12-09 |
| CN1025440C true CN1025440C (en) | 1994-07-13 |
Family
ID=4939755
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 92102623 Expired - Fee Related CN1025440C (en) | 1992-04-08 | 1992-04-08 | Low temp. salt bath vanadium-nitride co-permeate technology (MN) |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1025440C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7438769B2 (en) * | 2006-04-18 | 2008-10-21 | Philos Jongho Ko | Process for diffusing titanium and nitride into a material having a coating thereon |
| CN101871087B (en) * | 2009-04-21 | 2013-02-13 | 上海江凯金属表面处理技术有限公司 | Salt bath formula for treating high-speed steel air conditioning compressor blade by salt bath nitriding treatment and treatment method |
| CN106191762A (en) * | 2016-08-31 | 2016-12-07 | 湖北工业大学 | A kind of cold-working die surface salt bath processing method |
-
1992
- 1992-04-08 CN CN 92102623 patent/CN1025440C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1066891A (en) | 1992-12-09 |
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