CN102744404B - Surface bonding-proof method for hard alloy parison sintering boat - Google Patents
Surface bonding-proof method for hard alloy parison sintering boat Download PDFInfo
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- CN102744404B CN102744404B CN 201210261294 CN201210261294A CN102744404B CN 102744404 B CN102744404 B CN 102744404B CN 201210261294 CN201210261294 CN 201210261294 CN 201210261294 A CN201210261294 A CN 201210261294A CN 102744404 B CN102744404 B CN 102744404B
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Abstract
The invention relates to a surface bonding-proof method for a hard alloy parison sintering boat, which comprises plasma spraying technology equipment. The plasma spraying has the following main parameters as follows: operation current is 300-600A, operation voltage is 50-100V, the argon flow of main sprayed air is 2000ml/min, the secondary hydrogen flow is 100ml/min, air pressure is 0.3-0.5MP, sprayed raw material is zirconia powder ZrO, power sent flow is 200-400ml, and a spraying interval is 30-80mm. The thickness of a plasma spraying bonding-proof layer is 0.5mm, the surface color is even and consistent, the spraying surface is free from obvious cracks and stripping, sintering is carried out for 10 times, and the problem of affecting the product quality in the use process is avoided. Compared with the traditional brush-purposed parison sintering boat which only can be used for one time, the hard alloy parison sintering boat is characterized by prolonging the service life by 10 times and improving the production efficiency by more than 10 times.
Description
Technical field
The present invention relates to a kind of surface protection process of vessel, particularly a kind of manufacture difficulty is large, influence factor is many, the surface anti sticking knot method of the parison sintering boat of the carbide alloy that demands strict technology.
Background technology
Carbide alloy is the most widely used a kind of material in cutting tool, wear part, the mine instrument, because of its high rigidity, high strength, high-wearing feature be otherwise known as " industry tooth ".-sintering three large operations that the main production of carbide alloy is included as raw-material preparation---pressed compact moulding---.Sintering circuit is that last procedure of CEMENTED CARBIDE PRODUCTION refers to the carbide alloy pressed compact is formed the carbide alloy with high rigidity, high strength, high-wearing feature by the centigrade pyroreaction of 1350-1550.Because temperature is too high in the sintering process, thereby the carbide alloy pressed compact causes the basic change that the product tissue is arranged and then causes product quality defective that with various common contact material generation chemical reactions the selection of the parison sintering boat of carbide alloy and anti-stick thereof have become a difficult problem in the CEMENTED CARBIDE PRODUCTION easily.
Our traditional method of operating is parison sintering boat surface brush one deck even which floor bond breaker at carbide alloy at present.This binding material mainly is the coating that forms by by number of chemical reagent and carbon black, and every processing once also just is merely able to use once basically, once afterwards will wipe dope layer off and again refresh coating; The very loaded down with trivial details and inhomogeneities that manually brush boat of the cleaning of parison sintering boat and brush boat work is also brought many unstability factors to product, and these unstability will have a strong impact on product quality.And because this anti-stick coating is used the volatile materials such as poisonous and harmful such as tween, PEG, n-butanol, easily employee's health is caused in various degree injury aborning.
Plasma spraying is the technology of a kind of material surface strengthening and surface modification, plasma spraying technology is to adopt plasma-arc by DC powered as thermal source, the materials such as pottery, alloy, metal are heated to melting or semi-molten state, and to spray to the method that forms the superficial layer of adhesion-tight through pretreated surface of the work at a high speed, be used widely in the contour leading-edge field of Aero-Space.It is blank that but plasma spraying technology still belongs in the process for protecting surface field of the parison sintering boat of carbide alloy.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of surface anti sticking knot method of parison sintering boat of carbide alloy, the anti-stick layer of spraying can effectively prevent under the high temperature, thereby the contact material generation chemical reaction of carbide alloy pressed compact and parison sintering boat causes product quality defective.Existing plasma spray application field not yet relates to CEMENTED CARBIDE PRODUCTION, therefore also do not have ready-made technique to be applicable to the making of anti-stick layer of the parison sintering boat surface of coated with hard alloy, the major parameter of plasma spraying and spraying raw material need development test, seek the best-of-breed technology scheme.
For solving the problems of the technologies described above, technical scheme of the present invention is: a kind of surface anti sticking knot method of parison sintering boat of carbide alloy, comprise plasma spraying equipment, it is characterized in that: plasma spraying anti-stick layer is carried out on the surface to pretreated carbide alloy parison sintering boat;
[1] plasma spray coating process major parameter:
Running current: 300A-600A
Working voltage: 50V-100V
Spray main gas: argon gas or nitrogen
Spraying time gas: hydrogen or helium
Main gas flow: 2000ml/min
Hydrogen flowing quantity: 100ml/min
Gas pressure: 0.3MP-0.5MP
Powder feeding flow: 200ml-400ml,
Spraying raw material: zirconia powder ZrO,
Spraying spacing: 30mm-80mm;
[2] spraying raw material: zirconia powder ZrO, natural zirconia raw mineral materials, proportion 4.6-4.7, hardness 7.5,2700 ℃ of fusing points, zirconia material has high rigidity, high strength, high tenacity, high wearability and the physical and chemical performance of chemical resistance.
The anti-stick layer thickness of plasma spraying is 0.3--0.8mm, the surface color uniformity, and sprayed surface is without obvious slight crack and peel off the sintering access times: do not occur any problem that affects product quality in 10 use procedures.
The preliminary treatment of described carbide alloy parison sintering boat comprises:
[1] by special-purpose sand-blasting machine, adopt the blasting pressure of 40-80 order alumina grits, 5-8bar that the sintering boat surface is carried out blasting treatment, make the surface of boat have certain roughness;
[2] boat is carried out the pre-heat treatment, preheat temperature generally between 80-150 degree centigrade main purpose be remover surface moisture, improve the body surface state of activation.
The invention has the beneficial effects as follows:
1, the anti-stick layer of spraying can effectively prevent under the high temperature, the carbide alloy pressed compact easily with the contact material generation chemical reaction of parison sintering boat, thereby the quality stability that guarantees carbide alloy has obtained effectively raising.
2, the sintering number of the carbide alloy parison sintering boat of spraying anti-stick layer has reached more than 10 times, and this enhances productivity more than ten doubly than the dope layer that is merely able to expendable original conventional brush system; Exempted cleaning work very loaded down with trivial details and that product is brought the parison sintering boat of many unstability factors, eliminated because this anti-stick coating is used the volatile materials such as poisonous and harmful such as tween, PEG, n-butanol, easily employee's health has been caused in various degree injury aborning.Significantly improved the production environment of carbide alloy.
3, recycling, economize on resources; To the carbide alloy parison sintering boat of the spraying anti-stick layer that reaches sintering number, process by surface sand-blasting, peel off the zirconia anti-stick layer of retention, can be for spray again the anti-stick layer next time; Because zirconia powder is nontoxic material, when surface sand-blasting is processed, can separate zirconia powder and collect by dust collecting system, hand to zirconia powder factory and further purify, produce qualified zirconia.
The specific embodiment
Embodiment 1:A kind of surface anti sticking knot method of parison sintering boat of carbide alloy comprises plasma spray coating process equipment: plasma spraying anti-stick layer is carried out on the surface to pretreated carbide alloy parison sintering boat;
[1] plasma spray coating process major parameter:
Running current: 300A-600A
Working voltage: 50V-100V
Spray main gas: argon gas or nitrogen
Spraying time gas: hydrogen or helium
Main gas flow: 2000ml/min
Hydrogen flowing quantity: 100ml/min
Gas pressure: 0.3MP-0.5MP
Powder feeding flow: 200ml-400ml,
Spraying raw material: zirconia powder ZrO,
Spraying spacing: 30mm-80mm;
[2] spraying raw material: zirconia powder ZrO, natural zirconia raw mineral materials, proportion 4.6-4.7, hardness 7.5,2700 ℃ of fusing points, zirconia material has high rigidity, high strength, high tenacity, high wearability and the physical and chemical performance of chemical resistance.
The anti-stick layer thickness of plasma spraying is the positive and negative 0.1mm of 0.5mm deviation, the surface color uniformity, sprayed coating and boat body bond firm sprayed surface without obvious slight crack and peel off the sintering access times: do not occur any problem that affects product quality in 10 use procedures.
Embodiment 2:Embodiment 1 described carbide alloy parison sintering boat preliminary treatment comprises:
[1] by special-purpose sand-blasting machine, adopt the blasting pressure of 40-80 order alumina grits, 5-8bar that the sintering boat surface is carried out blasting treatment, make the surface of boat have certain roughness;
[2] boat is carried out the pre-heat treatment, preheat temperature generally between 80-150 degree centigrade main purpose be remover surface moisture, improve the body surface state of activation.
Embodiment 3:Whether be applicable to the anti-stick layer of the parison sintering boat surface of coated with hard alloy at the research plasma spray coating process, seek once to select peroxidating aluminium in the test of best spraying raw material, claim again alundum (Al2O3), chemical formula: Al2O3, molecular weight: 102, be commonly referred to " alumina ", be the amorphous powder of a kind of white, be commonly called as alumina, belong to atomic crystal, molecular link is covalent bond, fusing point is 2050 ℃, and boiling point is 3000 ℃, and real density is 3.6g/cm.Can be dissolved in the ice crystal of melting.Aluminium oxide can mechanical bearing processed or clock and watch in diamond, also as high-temperature refractory, refractory brick processed, crucible, porcelain, synthetic cut stone etc.Development test repeatedly shows: zirconic comprehensive stability is better than the bond breaker that aluminium oxide is suitable for cemented carbide sintering more, so first selective oxidation zirconium powder is as the raw material of used for plasma spraying.
Secondly the improvement of development test plasma spraying equipment: because the essential high temperature resistant and good stability of the bond breaker of cemented carbide sintering, so the requirement of microstructure of plasma sprayed equipment has just had further raising.At first, the power supply of equipment needs further to strengthen to improve power limiting and power supply stability, need make improvement than the selected power supply of the spraying coating process of routine; As improve maximum operating currenbt and make it satisfy output maximum current to reach more than the 650A, and anti-High-frequency Interference ability is strong; The constant current precision is less than 1%; Permanent power precision is less than 5%.Secondly, corresponding adjustment must be made for dystectic characteristic in the angle of the internal structure nozzle bore of spray gun and the aperture of nozzle; Require spray gun to have following performance:
1, must there be very high concentricity in electrode and nozzle duct, if there is off-centre will very easily cause the scaling loss of nozzle;
2, to have reliable insulating properties, because positive and negative electrode will have the above high pressure of 5000V, but also will bear the hyperthermia radiation of plasma arc;
3, to have good cooling effect, because nozzle and negative electrode will bear very large thermic load, not have good cooling just to be difficult to guarantee the service life of nozzle and negative electrode.
Claims (2)
1. the surface anti sticking knot method of the parison sintering boat of a carbide alloy comprises plasma spraying equipment, it is characterized in that:
Plasma spraying anti-stick layer is carried out on surface to pretreated carbide alloy parison sintering boat;
[1] plasma spray coating process major parameter:
Running current: 300A-600A
Working voltage: 50V-100V
Spray main gas: argon gas or nitrogen
Spraying time gas: hydrogen or helium
Main gas flow: 2000ml/min
Hydrogen flowing quantity: 100ml/min
Gas pressure: 0.3MP-0.5MP
Powder feeding flow: 200ml-400ml,
Spraying raw material: zirconia powder ZrO,
Spraying spacing: 30mm-80mm;
[2] spraying raw material: zirconia powder ZrO, natural zirconia raw mineral materials, proportion 4.6-4.7, hardness 7.5,2700 ℃ of fusing points, zirconia material has high rigidity, high strength, high tenacity, high wearability and the physical and chemical performance of chemical resistance;
[3] the anti-stick layer thickness of plasma spraying is 0.3mm--0.8mm.
2. the surface anti sticking knot method of the parison sintering boat of a kind of carbide alloy claimed in claim 1, it is characterized in that: the preliminary treatment of described carbide alloy parison sintering boat comprises:
[1] by special-purpose sand-blasting machine, adopt the blasting pressure of 40-80 order alumina grits, 5-8bar that the sintering boat surface is carried out blasting treatment, make the surface of boat have certain roughness;
[2] boat is carried out the pre-heat treatment, preheat temperature generally between 80-150 degree centigrade main purpose be remover surface moisture, improve the body surface state of activation.
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| CN103602942B (en) * | 2013-11-18 | 2016-03-23 | 中国科学院上海硅酸盐研究所 | The method of high-temperaure coating coating crucible surface protection precious metal crucible |
| CN106987158B (en) * | 2017-05-08 | 2018-04-10 | 株洲力洲硬质合金有限公司 | A kind of spraying barrier coating for high-cobalt hart metal product sintering |
| CN109580380A (en) * | 2018-12-25 | 2019-04-05 | 江苏隆达超合金航材有限公司 | The method glutinous for fixture resistance in high temperature endurance performance experiment |
| CN111621731B (en) * | 2020-06-11 | 2022-09-30 | 南昌硬质合金有限责任公司 | Preparation method of graphite boat isolation coating for hard alloy sintering |
| CN113369488B (en) * | 2021-05-27 | 2024-03-08 | 崇义章源钨业股份有限公司 | Reduction boat and preparation method thereof |
| CN116003163B (en) * | 2022-12-05 | 2024-03-15 | 浙江恒成硬质合金有限公司 | Coating for sintering hard alloy bar |
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| JPH04308048A (en) * | 1991-04-04 | 1992-10-30 | Tokyo Tungsten Co Ltd | Production of porous tungsten material |
| CN101928478A (en) * | 2009-06-18 | 2010-12-29 | 自贡硬质合金有限责任公司 | Coating for high bonding phase cemented carbide sintering |
| CN101972848A (en) * | 2010-11-17 | 2011-02-16 | 河源富马硬质合金股份有限公司 | Coating special for vacuum sintering of cobalt-rich hard alloys and preparation and use methods thereof |
| CN102585569A (en) * | 2011-12-23 | 2012-07-18 | 江西稀有稀土金属钨业集团有限公司 | Coating for sintering hard alloy, preparation method and using method |
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Patent Citations (4)
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| JPH04308048A (en) * | 1991-04-04 | 1992-10-30 | Tokyo Tungsten Co Ltd | Production of porous tungsten material |
| CN101928478A (en) * | 2009-06-18 | 2010-12-29 | 自贡硬质合金有限责任公司 | Coating for high bonding phase cemented carbide sintering |
| CN101972848A (en) * | 2010-11-17 | 2011-02-16 | 河源富马硬质合金股份有限公司 | Coating special for vacuum sintering of cobalt-rich hard alloys and preparation and use methods thereof |
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Non-Patent Citations (1)
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Application publication date: 20121024 Assignee: Jiangxi Jiang tungsten cemented carbide Co., Ltd. Assignor: Jiangxi Rare Earth and Rare Metals Tungsten Group Co., Ltd. Contract record no.: 2015360000011 Denomination of invention: Surface bonding-proof method for hard alloy parison sintering boat Granted publication date: 20131023 License type: Exclusive License Record date: 20150202 |
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Effective date of registration: 20220211 Address after: 330600 Industrial Park, Jing'an County, Yichun City, Jiangxi Province Patentee after: JIANGXI JIANGWU CEMENTED CARBIDE CO.,LTD. Address before: 330046 No. 118 West Beijing Road, Jiangxi, Nanchang Patentee before: JIANGXI RARE EARTH AND RARE METALS TUNGSTEN Group Corp. |
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