CN103774026A - Method for preparing hard alloy product containing surface low-cobalt layer - Google Patents
Method for preparing hard alloy product containing surface low-cobalt layer Download PDFInfo
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- CN103774026A CN103774026A CN201310715146.XA CN201310715146A CN103774026A CN 103774026 A CN103774026 A CN 103774026A CN 201310715146 A CN201310715146 A CN 201310715146A CN 103774026 A CN103774026 A CN 103774026A
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Abstract
The invention relates to a method for preparing a hard alloy product containing a surface low-cobalt layer. The method comprises the following steps: regulating the component proportion of the hard alloy product and improving the sintering process of metal carbides and binder cobalt: mixing, mixing raw materials in a regulated component ratio, pressing to mold and sintering; regulating the highest sintering temperature of the hard alloy product, inhibiting liquid cobalt from spilling outward from the inside of the product in the high-temperature sintering stage to avoid forming a cobalt-enriched layer on the product surface; sintering the product in a differential pressure mode in the high-temperature sintering stage, and quickly introducing high-pressure gas into a furnace to realize quick cooling after the highest sintering temperature is reached. According to the method, liquid cobalt is effectively inhibited from spilling outward from the inside of the product in the high-temperature sintering stage, so that a cobalt-enriched layer is prevented from forming on the product surface; the surface low-cobalt layer does not have remarkable cobalt conglomeration or cobalt segregation, cobalt and metal carbides are uniformly distributed, so that the product quality and processing efficiency can be greatly improved, the service life of the product can be greatly prolonged, and the competitive strength of domestic blades for replacing imported blades can be promoted.
Description
Technical field
The present invention relates to a kind of preparation technology of hart metal product, particularly a kind of preparation method of the hart metal product containing surperficial low cobalt layer.
Background technology
Wimet refers to that the one obtaining by high temperature sintering has high rigidity, high red hardness metallic substance take refractory carbide and matrix metal as main component.What mainly use due to current our matrix metal is cobalt metal, and cobalt metal belongs to low melting material, mainly plays the effect of matrix metal in Wimet, and fusing point therefore will be well below refractory carbide.Therefore can occur with liquid situation at the high temperature sintering stage in sintering later stage cobalt metal, and the environment that in sintering process, the environment in our stove is high vacuum, therefore start just to have liquid cobalt outwards to overflow from interiors of products from this stage, thereby form the rich surface cobalt layer of product.And a kind of cobalt contents of body is that factor forms rich cobalt layer on surface because the cobalt contents of extexine is higher and tungsten carbide particle is partially thin etc. for the General hard alloy product of 10% left and right.Therefore we are detected and find that this trade mark carbide surface cobalt contents reaches 45%-75%, serious 10% cobalt contents that has exceeded product itself product by energy spectrometer.Our Wimet is mainly used for the metal processing of various metals and mechanically resistant material as everyone knows, severe work condition environment is very high to the hardness requirement of Wimet itself, and the appearance of alloy surface layer soft metal cobalt will make we hart metal product work in-process occur not wear-resisting, work-ing life not high phenomenon.
Summary of the invention
For the deficiency that contains at present rich surface cobalt layer Wimet old product, the object of the present invention is to provide the preparation method of the hart metal product containing surperficial low cobalt layer of a kind of durable wear, high life.
For solving the problems of the technologies described above, technical scheme of the present invention is: a kind of preparation method of the hart metal product containing surperficial low cobalt layer, comprising:
(1) adjust hart metal product composition proportion
[1] a kind of main components in percentage by weight of the Wimet old product containing rich surface cobalt layer:
WC powder: 85%-95%
Co powder: 9.5%-10.5%
Additive: chromium carbide: 0.5%-1.0%
C content: 5.60%-5.70%
Wc grain size: 0.8um
Co Powder Particle Size <1.5um
Forming agent: polyoxyethylene glycol: 2%;
[1] a kind of main components in percentage by weight of the Wimet product innovation containing surperficial low cobalt layer:
WC powder: 88%-92%
Co powder: 9.8%-10.2%
Additive: the chromium carbide of equivalent and tantalum carbide niobium: 1.0%-2.0%
C content: 5.60%-5.70%
Wc grain size: 0.8um
Co Powder Particle Size <1.5um
Forming agent: polyoxyethylene glycol: 2%.
(2) sintering process of improvement metallic carbide and matrix metal cobalt:
By refractory carbide and matrix metal cobalt, obtain a kind of Wimet with high rigidity by high temperature sintering, the fusing point of cobalt metal will, well below refractory carbide, mainly play the effect of matrix metal in Wimet; Therefore can occur with liquid form at the high temperature sintering stage in sintering later stage cobalt metal, and the environment that environment in sintering oven is high vacuum, therefore just there is liquid cobalt outwards to overflow from interiors of products in traditional sintering process high temperature sintering stage, thereby form the rich cobalt layer of product surface, cobalt surface content reaches 45%-75%, the serious cobalt contents that has exceeded product itself 10%;
Improved sintering process is:
[1] raw material of adjusting component proportioning is mixed;
[2] by sintering after the raw material compression moulding mixing;
[3] the highest sintering temperature of adjustment hart metal product, the highest sintering temperature of Wimet is to be soaked as the best by liquid phase matrix metal cobalt completely with the metallic carbide of infusibility; But wolfram varbide is a temperature range by the temperature of complete wetting, therefore the highest sintering temperature of this brand Wimet is rationally adjusted within 1400 ℃-1430 ℃, can suppress liquid cobalt and outwards overflow from interiors of products in the high temperature sintering stage, thereby avoid product surface to form rich cobalt layer;
[4] in the high temperature sintering stage, product is carried out to dividing potential drop sintering: after sintering temperature reaches 1250 ℃, start dividing potential drop sintering 65-105 minute, force value is 20mbar-50mbar, reach after the highest sintering temperature at product, in stove, pass into inertia high pressure (20bar-40bar) gas rapidly, realize cooling fast.
Improved agglomerant artistic skill effectively suppresses liquid cobalt outwards overflowed from cemented carbide body inside in the high temperature sintering stage, thereby what guarantee that product surface forms is not rich cobalt layer but low cobalt layer; The cobalt contents per-cent of low cobalt layer is down to 12%-25%, and surperficial low cobalt layer is without significantly cobalt gathering or cobalt segregation, and metallic carbide WC and matrix metal cobalt Co two-phase are evenly distributed.
Without the Hard alloy of rich cobalt, in follow-up physics coating (PVD), between Wimet and coated material (TiN/TiALN), bonding force is higher than the 10%-15% of rich surface cobalt hard alloy on surface, and after coating, product is largely increased work-ing life.
beneficial effect of the present invention:
1, can effectively suppress liquid cobalt containing the hart metal product preparation method of surperficial low cobalt layer and outwards overflow from interiors of products in the high temperature sintering stage, thereby avoid product surface to form rich cobalt layer; The cobalt contents per-cent of the low cobalt layer of product surface is down to 12%-25%, and surperficial low cobalt layer is without significantly cobalt gathering or cobalt segregation, and cobalt and metallic carbide two-phase are evenly distributed, thereby have directly improved working (machining) efficiency and the work-ing life of this product.
2, this product is through being commonly used for the body of coated chip, surface hard alloy in low cobalt is in follow-up coating, between hard alloy body and coating, bonding force is higher than the 10%-15% of rich surface cobalt hard alloy, quality product, use properties and work-ing life after coating are largely increased, and greatly promote the competitive power of domestic blade replace imported blade.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the present invention is further described.
Fig. 1 is the schematic flow sheet containing the hart metal product preparation method of surperficial low cobalt layer.
Fig. 2 is the product surface layer picture of adopting new technology.
Fig. 3 is the product surface layer picture that adopts old technique.
Embodiment
embodiment 1:1# is containing the hart metal product preparation method of surperficial low cobalt layer;
[1] containing the main component of surperficial low cobalt layer hart metal product:
WC powder: 88%
Co powder: 10.2%
Additive: the chromium carbide of equivalent and tantalum carbide niobium: 1.2%
C content: 5.60%
Wc grain size: 0.8um
Co Powder Particle Size <1.5um
Forming agent: polyoxyethylene glycol: 2%.
[2] sintering process adjustment: start dividing potential drop sintering after sintering temperature reaches 1250 ℃: 1250 ℃, force value is 20mbar sintering 105 minutes; 1350 ℃ start dividing potential drop sintering, and force value is 40mbar sintering 65 minutes; 1400 ℃ start dividing potential drop sintering, and force value is 50mbar sintering 35 minutes; After product reaches 1420 ℃ of the highest sintering temperatures, in stove, pass into inertia high pressure (40bar) gas rapidly, realize cooling fast.
[3] the highest sintering temperature of adjustment 1# brand hart metal product, the highest sintering temperature of Wimet is to be soaked as the best by liquid phase matrix metal cobalt completely with the metallic carbide of infusibility; But wolfram varbide is a temperature range by the temperature of complete wetting, therefore the highest sintering temperature of this brand Wimet is rationally adjusted within (1400 ℃-1430 ℃) interval, can suppress liquid cobalt and outwards overflow from interiors of products in the high temperature sintering stage, thereby avoid product surface to form rich cobalt layer.
Improved agglomerant artistic skill effectively suppresses liquid cobalt outwards overflowed from cemented carbide body 1 inside in the high temperature sintering stage, thereby what guarantee that product surface forms is not rich cobalt layer but low cobalt layer 2; The cobalt contents per-cent of low cobalt layer 2 is down to 12%-25%, and surperficial low cobalt layer 2 is without significantly cobalt gathering or cobalt segregation, and metallic carbide WC and matrix metal cobalt Co two-phase are evenly distributed.
embodiment 2:2# is containing the hart metal product preparation method of surperficial low cobalt layer;
[1] Hard alloy main component:
WC powder: 90%
Co powder: 10%
Additive: the chromium carbide of equivalent and tantalum carbide niobium: 1.5%
C content: 5.70%
Wc grain size: 0.8um
Co Powder Particle Size <1.5um
Forming agent: polyoxyethylene glycol: 2%.
[2] and [3] identical with embodiment 1.
embodiment 3:3# is containing the hart metal product preparation method of surperficial low cobalt layer;
[1] Hard alloy main component:
WC powder: 92%
Co powder: 9.8%
Additive: the chromium carbide of equivalent and tantalum carbide niobium: 1.8%
C content: 5.65%
Wc grain size: 0.8um
Co Powder Particle Size <1.5um
Forming agent: polyoxyethylene glycol.
[2] and [3] identical with embodiment 1.
Detect 3# brand hart metal product upper layer without obvious cobalt metal brilliant white through outward appearance, product is normal greyish white metal color, and the nominal content that detects cobalt by scanning electron microscope energy disperse spectroscopy is 10%-15%, substantially approaches the nominal cobalt contents of product.Table specific as follows;
| Element | Weight | Atom | |
| Per-cent | Per-cent | ||
| C K | 11.57 | 60.74 | |
| Co K | 12.28 | 13.14 | |
| W M | 76.15 | 26.12 | |
| Total amount | 100.00 |
As follows by amplifying the photo that 5000 times of scanning electron microscope take: product surface cobalt and the metallic carbide two-phase of adopting new technology are evenly distributed, assemble and segregation without obvious cobalt, as shown in Figure 2.Obviously there is the cobalt gathering of bulk in the surface of old handicraft product, as shown in Figure 3.Therefore we can find out that the rich cobalt phenomenon of the product surface layer of adopting new technology improves significantly.
Claims (1)
1. a preparation method who contains the hart metal product of surperficial low cobalt layer, comprising:
(1) adjust hart metal product composition proportion:
(1) a kind of main components in percentage by weight of the Wimet old product containing rich surface cobalt layer:
WC powder: 85%-95%
Co powder: 9.5%-10.5%
Additive: chromium carbide: 0.5%-1.0%
C content: 5.60%-5.70%
Wc grain size: 0.8um
Co Powder Particle Size <1.5um
Forming agent: polyoxyethylene glycol: 2%;
(2) a kind of main components in percentage by weight of the Wimet product innovation containing surperficial low cobalt layer:
WC powder: 88%-92%
Co powder: 9.8%-10.2%
Additive: the chromium carbide of equivalent and tantalum carbide niobium: 1.0%-2.0%
C content: 5.60%-5.70%
Wc grain size: 0.8um
Co Powder Particle Size <1.5um
Forming agent: polyoxyethylene glycol: 2%;
(2) sintering process of improvement metallic carbide and matrix metal cobalt:
By refractory carbide (WC powder) and matrix metal cobalt (Co powder), obtain a kind of cemented carbide body (1) with high rigidity by high temperature sintering, the fusing point of cobalt metal will, well below refractory carbide, mainly play the effect of matrix metal in Wimet; Therefore can occur with liquid form at the high temperature sintering stage in sintering later stage cobalt metal, and the environment that environment in sintering oven is high vacuum, therefore just there is liquid cobalt outwards to overflow from interiors of products in traditional sintering process high temperature sintering stage, thereby form the rich cobalt layer of product surface, cobalt surface content reaches 45%-75%, the serious cobalt contents that has exceeded product itself 10%;
Improved sintering process is:
(1) raw material of adjusting component proportioning is mixed;
(2) by sintering after the raw material compression moulding mixing;
(3) the highest sintering temperature of adjustment hart metal product, the highest sintering temperature of Wimet is to be soaked as the best by liquid phase matrix metal cobalt completely with the metallic carbide of infusibility; But wolfram varbide is a temperature range by the temperature of complete wetting, therefore the highest sintering temperature of this brand Wimet is rationally adjusted within 1400 ℃-1430 ℃, can suppress liquid cobalt and outwards overflow from interiors of products in the high temperature sintering stage, thereby avoid product surface to form rich cobalt layer;
(4) in the high temperature sintering stage, product is carried out to dividing potential drop sintering: after sintering temperature reaches 1250 ℃, start dividing potential drop sintering 15-45 minute, force value is 20mbar-50mbar, reach after the highest sintering temperature at product, in stove, pass into inertia high pressure (20bar-40bar) gas rapidly, realize cooling fast;
Improved agglomerant artistic skill effectively suppresses liquid cobalt outwards overflowed from cemented carbide body (1) inside in the high temperature sintering stage, thereby what guarantee that product surface forms is not rich cobalt layer but low cobalt layer (2); The cobalt contents per-cent of low cobalt layer (2) is down to 12%-25%, and surperficial low cobalt layer (2) is without significantly cobalt gathering or cobalt segregation, and metallic carbide (WC) are evenly distributed with matrix metal cobalt (Co) two-phase;
Without the Hard alloy of rich cobalt, in follow-up physics coating (PVD), between Wimet and coated material (TiN/TiALN), bonding force is higher than the 10%-15% of rich surface cobalt hard alloy on surface, and after coating, product is largely increased work-ing life.
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| CN201310715146.XA CN103774026A (en) | 2013-12-23 | 2013-12-23 | Method for preparing hard alloy product containing surface low-cobalt layer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107999771A (en) * | 2017-11-28 | 2018-05-08 | 深圳市海明润超硬材料股份有限公司 | A kind of preparation method of diamond compact |
| CN110042294A (en) * | 2019-04-16 | 2019-07-23 | 株洲华锐精密工具股份有限公司 | Carbide chip and preparation method thereof for milling hardened steel |
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2013
- 2013-12-23 CN CN201310715146.XA patent/CN103774026A/en active Pending
Patent Citations (4)
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| JP2002187005A (en) * | 2000-12-22 | 2002-07-02 | Mitsubishi Materials Corp | Throwaway tip made of surface-coated cemented carbide excellent in wear resistance in high speed cutting |
| JP2005224914A (en) * | 2004-02-16 | 2005-08-25 | Mitsubishi Materials Kobe Tools Corp | Shaft cutting tool capable of high-speed cutting of hard-to-cut material |
| CN101914714A (en) * | 2010-08-25 | 2010-12-15 | 株洲硬质合金集团有限公司 | Nonmagnetic hard alloy and preparation method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107999771A (en) * | 2017-11-28 | 2018-05-08 | 深圳市海明润超硬材料股份有限公司 | A kind of preparation method of diamond compact |
| CN107999771B (en) * | 2017-11-28 | 2019-11-19 | 深圳市海明润超硬材料股份有限公司 | A kind of preparation method of diamond compact |
| CN110042294A (en) * | 2019-04-16 | 2019-07-23 | 株洲华锐精密工具股份有限公司 | Carbide chip and preparation method thereof for milling hardened steel |
| CN110042294B (en) * | 2019-04-16 | 2020-11-13 | 株洲华锐精密工具股份有限公司 | Hard alloy blade for milling quenched steel and preparation method thereof |
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Application publication date: 20140507 |