CN102744404A - 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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- CN102744404A CN102744404A CN2012102612944A CN201210261294A CN102744404A CN 102744404 A CN102744404 A CN 102744404A CN 2012102612944 A CN2012102612944 A CN 2012102612944A CN 201210261294 A CN201210261294 A CN 201210261294A CN 102744404 A CN102744404 A CN 102744404A
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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 big, 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 ".----pressed compact moulding----sintering three big operations that the main production of carbide alloy is included as preparing raw material.Sintering circuit is that last procedure of CEMENTED CARBIDE PRODUCTION is meant the carbide alloy that the carbide alloy pressed compact is had high rigidity, high strength, high-wearing feature through the centigrade pyroreaction formation 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 of forming through by number of chemical reagent and carbon black, and every basically processing once also just is merely able to use once, once afterwards will wipe dope layer off and refresh coating once more; The cleaning of parison sintering boat and the work of brush the boat very inhomogeneities of loaded down with trivial details and artificial brush boat also bring many unstability factors to product, and these unstability will have a strong impact on product quality.And, easily employee's health is caused injury in various degree aborning because this anti-stick coating is used volatile materials such as poisonous and harmful such as tween, PEG, n-butanol.
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; Materials such as pottery, alloy, metal are heated to fusion or semi-molten state; And, be used widely in high leading-edge fields such as Aero-Space to spray to the method that forms the superficial layer of adhesion-tight through pretreated surface of the work at a high speed.But plasma spraying technology still belongs to blank in the process for protecting surface field of the parison sintering boat of carbide alloy.
Summary of the invention
The technical problem that the present invention will solve 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 does not relate to CEMENTED CARBIDE PRODUCTION as yet; Therefore also do not have ready-made technology 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, and surface color uniformity, sprayed surface do not have tangible slight crack and peel off the sintering access times: do not occur any problem that influences product quality in 10 uses.
The preliminary treatment of said carbide alloy parison sintering boat comprises:
[1] through 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 raising effectively.
2, the sintering number of the carbide alloy parison sintering boat of spraying anti-stick layer has reached more than 10 times, and this is than the dope layer that is merely able to expendable original conventional brush system, enhances productivity surplus in the of ten times; Exempted cleaning work very loaded down with trivial details and that product brought the parison sintering boat of many unstability factors; Eliminated because this anti-stick coating is used volatile materials such as poisonous and harmful such as tween, PEG, n-butanol, easily employee's health has been caused injury in various degree 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, handle through surface sand-blasting, peel off the zirconia anti-stick layer of retention, can supply to spray again the anti-stick layer next time; Because zirconia powder is nontoxic material, when surface sand-blasting is handled, can separate zirconia powder and collect through 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 do not have tangible slight crack with peel off the sintering access times: any problem that influences product quality does not appear in 10 uses.
Embodiment 2:Embodiment 1 said carbide alloy parison sintering boat preliminary treatment comprises:
[1] through 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:Studying the anti-stick layer whether plasma spray coating process is applicable to the parison sintering boat surface of coated with hard alloy, seek once to select peroxidating aluminium in the test of best spraying raw material, claim alundum (Al again; 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 a 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 fusion.Aluminium oxide can make diamond in mechanical bearing or the clock and watch, also as high-temperature refractory, system refractory brick, crucible, porcelain, synthetic cut stone etc.Development test repeatedly shows: zirconic comprehensive stability property is superior to 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 article on plasma spraying equipment has just had further raising.At first, the power supply of equipment needs further increasing 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 to 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,, but also will bear the hyperthermia radiation of plasma arc because positive and negative electrode will have the above high pressure of 5000V;
3, to have favorable cooling effect,, not have good cooling just to be difficult to guarantee the service life of nozzle and negative electrode because nozzle and negative electrode will bear very big thermic load.
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, the 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 the described a kind of carbide alloy of claim 1, it is characterized in that: the preliminary treatment of said carbide alloy parison sintering boat comprises:
[1] through 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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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103602942A (en) * | 2013-11-18 | 2014-02-26 | 中国科学院上海硅酸盐研究所 | Method for protecting precious metal crucible by coating crucible with high temperature resistant coating |
| CN106987158A (en) * | 2017-05-08 | 2017-07-28 | 株洲力洲硬质合金有限公司 | A kind of spraying barrier coating sintered for high-cobalt hart metal product |
| 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 |
| CN111621731A (en) * | 2020-06-11 | 2020-09-04 | 南昌硬质合金有限责任公司 | Preparation method of graphite boat isolating coating for hard alloy sintering |
| CN113369488A (en) * | 2021-05-27 | 2021-09-10 | 崇义章源钨业股份有限公司 | Reduction boat and preparation method thereof |
| CN116003163A (en) * | 2022-12-05 | 2023-04-25 | 浙江恒成硬质合金有限公司 | Coating for sintering hard alloy bar |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103602942A (en) * | 2013-11-18 | 2014-02-26 | 中国科学院上海硅酸盐研究所 | Method for protecting precious metal crucible by coating crucible with high temperature resistant coating |
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| 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 |
| CN111621731A (en) * | 2020-06-11 | 2020-09-04 | 南昌硬质合金有限责任公司 | Preparation method of graphite boat isolating coating for hard alloy sintering |
| CN113369488A (en) * | 2021-05-27 | 2021-09-10 | 崇义章源钨业股份有限公司 | Reduction boat and preparation method thereof |
| 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 |
| CN116003163A (en) * | 2022-12-05 | 2023-04-25 | 浙江恒成硬质合金有限公司 | Coating for sintering hard alloy bar |
| 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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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. |