CN101871087A - Salt bath formula for treating high-speed steel air conditioning compressor blade by salt bath nitriding treatment and treatment method - Google Patents
Salt bath formula for treating high-speed steel air conditioning compressor blade by salt bath nitriding treatment and treatment method Download PDFInfo
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- CN101871087A CN101871087A CN200910049632A CN200910049632A CN101871087A CN 101871087 A CN101871087 A CN 101871087A CN 200910049632 A CN200910049632 A CN 200910049632A CN 200910049632 A CN200910049632 A CN 200910049632A CN 101871087 A CN101871087 A CN 101871087A
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Abstract
The invention relates to a salt bath formula for treating a high-speed steel air conditioning compressor blade by salt bath nitriding treatment and a treatment method. The salt bath formula comprises the following compositions in percentage by weight: 15-25 percent of potassium cyanate, 5-20 percent of sodium cyanate, 3-10 percent of lithium carbonate, 8-20 percent of sodium carbonate, 10-40 percent of potassium carbonate and 1-10 percent of sodium chloride. The invention has the advantages that because Li ions and Cl ions are added in the formula, the melting point of salt bath is lowered, and nitridation can be carried out under lower temperature; the activity is favorable, and good appearance and good diffusion layer thickness can be achieved without introducing ammonia; and the K/Na concentration proportion is enhanced, and a white layer is not easy to form on the surface of a workpiece.
Description
Technical field
The present invention relates to a kind of high-speed steel air conditioning compressor blade by salt bath nitriding treatment, relate in particular to salt bath formula and the technology used in this processing.
Background technology
For improving its wear resisting property and decrease of noise functions, require the no bright layer in surface, surface hardness＞1000HV in the high-speed steel air conditioning compressor blade (material is W6Mo5Cr4V2)
0.3, apart from the surface hardness 0.03mm hardness＞860HV of place
0.3Usually adopt surface carburization technology, adopt gas nitriding both at home and abroad at present mostly, shortcoming is that the nitrogenize activity is relatively poor, need long-time nitrogenize just can reach requirement, and be subjected to the influence of air-flow in the gas nitriding process, nitrogenize rear blade planeness is easily overproof, and needs could guarantee through oil cooling the degree of cleaning on surface.Though and conventional salt-bath nitriding can shorten nitridation time (generally just reaching requirement in 1 hour), owing to the active big fragility that causes workpiece easily at workpiece surface formation bright layer of salt bath.And because the oxide film of black powder can appear at workpiece surface in the tectorium that salt-bath nitriding forms, be difficult to reach metalluster in polishing process subsequently, we have developed salt bath formula and the technology that is suitable for high-speed steel blade for this reason.
Salt-bath nitriding technology of the prior art is with CO
3And CNO
-Deng composition by certain proportioning, after melting at 570 ℃--580 ℃ workpiece inserted and handles for some time in the fused salt, make the CNO in the salt
-Decompose the back nitrogen-atoms and infiltrate the sosoloid that forms FeN compound and certain nitrogen atom concentration in the matrix.In order to improve the salt bath activity, there is patent report to adopt the CNO of higher concentration
-Also attempt to add K outward,
2S and feeding ammonia.But this method not only makes operation become complicated, and can produce certain pollution (ammonia escapes into air) to environment.From actual effect, the rapid steel infiltration rate is not significantly improved yet.
Summary of the invention
The technical issues that need to address of the present invention have provided a kind of to the salt bath formula in the high-speed steel air conditioning compressor blade by salt bath nitriding treatment, are intended to solve the above problems.
In order to solve the problems of the technologies described above, the present invention is achieved by the following technical solutions:
The present invention is made up of and components by weight percentage following compositions: potassium cyanate (KCNO) 15%-25%, Zassol (NaCNO) 5%-20%, Quilonum Retard (Li
2CO
3) 3%-10%, yellow soda ash (Na
2CO
3) 8%-20%, salt of wormwood (K
2CO
3) 10%-40%, sodium-chlor (NaCl) 1-10%.
The present invention also provides a kind of salt Bath Nitriding Treatment method, realizes by following steps:
Degreasing: remove the oil film on slide plate surface with the organic solvent of alcohol or dimethylbenzene, through the no greasy dirt of rear surface cleaning that volatilizees naturally;
Preheating: adopt pit furnace, slide plate thermally equivalent when bell is installed blower fan and made preheating, the temperature difference is controlled at ± and 10 ℃; Temperature is between 250 ℃-350 ℃; Time is between 20-30 minute;
Nitrogenize: adopt salt bath formula, the nitriding treatment temperature is between 540 ℃-570 ℃, and the treatment time is 20-90 minute; Described salt bath formula is made up of and components by weight percentage following compositions: potassium cyanate (KCNO) 15%-25%, Zassol (NaCNO) 5%-20%, Quilonum Retard (Li
2CO
3) 3%-10%, yellow soda ash (Na
2CO
3) 8%-20%, salt of wormwood (K
2CO
3) 10%-40%, sodium-chlor (NaCl) 1-10%.
Cooling: adopt air cooling, below the back air cooling to 100 ℃ of coming out of the stove; Or adopt direct oil cooling;
Polishing.
Compared with prior art, the invention has the beneficial effects as follows: owing in prescription, add Li and Cl ion, the fusing point in the salt bath is reduced, can carry out nitrogenize at a lower temperature; Active good, ammonia needn't be fed and good surface appearance and alloying layer thickness can be reached; Improve the K/Na concentration ratio, workpiece surface is difficult for forming bright layer.
Embodiment
Below in conjunction with embodiment the present invention is described in further detail:
The present invention is made up of and components by weight percentage following compositions: potassium cyanate (KCNO) 15%-25%, Zassol (NaCNO) 5%-20%, Quilonum Retard (Li
2CO
3) 3%-10%, yellow soda ash (Na
2CO
3) 8%-20%, salt of wormwood (K
2CO
2) 10%-40%, sodium-chlor (NaCl) 1-10%.
Embodiment 1
Potassium cyanate (KCNO) 25%, Zassol (NaCNO) 15%, Quilonum Retard (Li
2CO
3) 5%, yellow soda ash (Na
2CO
3) 15%, salt of wormwood (K
2CO
3) 30%, sodium-chlor (NaCl) 10%.
Embodiment 2
Potassium cyanate (KCNO) 25%, Zassol (NaCNO) 15%, Quilonum Retard (Li
2CO
3) 5%, yellow soda ash (Na
2CO
3) 15%, salt of wormwood (K
2CO
3) 35%, sodium-chlor (NaCl) 5%.
Mainly be to constitute in the component of the present invention by cyanate radical and carbonate, its reaction mechanism is that cyanate and oxygen reaction generate nitrogen and carbonate, wherein nitrogen-atoms infiltrates in the matrix, and along with the carrying out used up cyanate radical and can be mended by adding regenerant salt of reaction, this prescription salt can recycle.
CNO
-+O
2→[C]+[N]+CO
3 2-
CO
3 2-+ Z (regenerant salt) → CNO
-
Preparation method of the present invention is as follows:
Urea and carbonate and other component thorough mixing are put into crucible after evenly, and insulation can be produced in batches in 2 hours after 600 ℃ of high temperature melt.Use the same method and to obtain regenerant salt.
The mechanism of action of the present invention is: owing to added the active anion that contains F or Cl in the salt bath, and the activity of Li ion itself is higher than Na and K ion, and so add the activity that an amount of Li can improve salt bath.And activate its workpiece surface, it is more easy to make that the infiltration of nitrogen becomes, even at low CNO
-Still can obtain infiltration rate faster under concentration and the low treatment temp, and need not to feed ammonia.But for fear of the formation of bright layer, we have suitably improved the ratio (the K/Na concentration ratio is 2-3, and conventional salt-bath nitriding solution K/Na concentration ratio is 1-1.6) of K/Na, and reduce CNO
-Concentration.
Claims (4)
1. one kind to the salt bath formula in the high-speed steel air conditioning compressor blade by salt bath nitriding treatment, form and components by weight percentage by following compositions: potassium cyanate 15%-25%, Zassol 5%-20%, Quilonum Retard 3%-10%, yellow soda ash 8%-20%, salt of wormwood 10%-40%, sodium-chlor 1-10%.
2. salt bath formula according to claim 1, wherein: potassium cyanate 25%, Zassol 15%, Quilonum Retard 5%, yellow soda ash 15%, salt of wormwood 30%, sodium-chlor 10%.
3. salt bath formula according to claim 1, wherein: potassium cyanate 25%, Zassol 15%, Quilonum Retard 5%, yellow soda ash 15%, salt of wormwood 35%, sodium-chlor 5%.
4. method to the high-speed steel air conditioning compressor blade by salt bath nitriding treatment, realize by following steps:
Degreasing: remove the oil film on slide plate surface with the organic solvent of alcohol or dimethylbenzene, through the no greasy dirt of rear surface cleaning that volatilizees naturally;
Preheating: adopt pit furnace, slide plate thermally equivalent when bell is installed blower fan and made preheating, the temperature difference is controlled at ± and 10 ℃; Temperature is between 250 ℃-350 ℃; Time is between 20-30 minute;
Nitrogenize: adopt salt bath formula, the nitriding treatment temperature is between 540 ℃-570 ℃, and the treatment time is 150-300 minute; Described salt bath formula is made up of and components by weight percentage following compositions: potassium cyanate 15%-25%, Zassol 5%-20%, Quilonum Retard 3%-10%, yellow soda ash 8%-20%, salt of wormwood 10%-40%, sodium-chlor 1-10%;
Cooling: adopt air cooling, below the back air cooling to 100 ℃ of coming out of the stove; Or adopt direct oil cooling;
Polishing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910049632 CN101871087B (en) | 2009-04-21 | 2009-04-21 | Salt bath formula for treating high-speed steel air conditioning compressor blade by salt bath nitriding treatment and treatment method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910049632 CN101871087B (en) | 2009-04-21 | 2009-04-21 | Salt bath formula for treating high-speed steel air conditioning compressor blade by salt bath nitriding treatment and treatment method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101871087A true CN101871087A (en) | 2010-10-27 |
| CN101871087B CN101871087B (en) | 2013-02-13 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102220553A (en) * | 2011-07-04 | 2011-10-19 | 四川大学 | Nitride salt for low temperature salt bath nitriding of stainless steel |
| CN102492918A (en) * | 2011-11-29 | 2012-06-13 | 青岛张氏机械有限公司 | Piston rod and production method thereof as well as carbonitriding agent for piston rod surface treatment |
| CN102965613A (en) * | 2012-12-05 | 2013-03-13 | 南京航空航天大学 | Low-temperature surface nitriding method of titanium alloy |
| CN105420664A (en) * | 2015-12-07 | 2016-03-23 | 郭伟 | Rare earth formula salt used for deep QPQ technology and preparing method of rare earth formula salt |
| CN108251788A (en) * | 2018-01-11 | 2018-07-06 | 成都赛飞斯金属科技有限公司 | A kind of EMU braking steel back handled through tufftride and soft-nitriding treatment method |
| CN108588635A (en) * | 2018-04-26 | 2018-09-28 | 台州市百达热处理有限公司 | Compressor high-speed steel slide plate salt bath nitriding treatment method |
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| CN101144148A (en) * | 2007-11-08 | 2008-03-19 | 孙国飞 | Salt bath nitriding heat treatment method for metal surface |
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2009
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| DE3144295C1 (en) * | 1981-11-07 | 1983-02-03 | Degussa Ag, 6000 Frankfurt | Method of processing sintered carbide wastes |
| CN1041978A (en) * | 1989-10-21 | 1990-05-09 | 机械电子工业部武汉材料保护研究所 | The low temperature salt-bath vanadium nitrogen sulphur common seeping technology |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102220553A (en) * | 2011-07-04 | 2011-10-19 | 四川大学 | Nitride salt for low temperature salt bath nitriding of stainless steel |
| CN102220553B (en) * | 2011-07-04 | 2012-11-28 | 四川大学 | Nitride salt for low temperature salt bath nitriding of stainless steel |
| CN102492918A (en) * | 2011-11-29 | 2012-06-13 | 青岛张氏机械有限公司 | Piston rod and production method thereof as well as carbonitriding agent for piston rod surface treatment |
| CN102492918B (en) * | 2011-11-29 | 2013-10-30 | 青岛张氏机械有限公司 | Piston rod and production method thereof as well as carbonitriding agent for piston rod surface treatment |
| CN102965613A (en) * | 2012-12-05 | 2013-03-13 | 南京航空航天大学 | Low-temperature surface nitriding method of titanium alloy |
| CN102965613B (en) * | 2012-12-05 | 2014-10-15 | 南京航空航天大学 | Low-temperature surface nitriding method of titanium alloy |
| CN105420664A (en) * | 2015-12-07 | 2016-03-23 | 郭伟 | Rare earth formula salt used for deep QPQ technology and preparing method of rare earth formula salt |
| CN108251788A (en) * | 2018-01-11 | 2018-07-06 | 成都赛飞斯金属科技有限公司 | A kind of EMU braking steel back handled through tufftride and soft-nitriding treatment method |
| CN108588635A (en) * | 2018-04-26 | 2018-09-28 | 台州市百达热处理有限公司 | Compressor high-speed steel slide plate salt bath nitriding treatment method |
| CN108588635B (en) * | 2018-04-26 | 2020-09-29 | 台州市百达热处理有限公司 | Salt bath nitriding treatment method for high-speed steel sliding sheet of compressor |
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