CN109852865A - A kind of mold heat resistant and wear resistant cemented carbide material and preparation method thereof - Google Patents
A kind of mold heat resistant and wear resistant cemented carbide material and preparation method thereof Download PDFInfo
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- CN109852865A CN109852865A CN201910164103.4A CN201910164103A CN109852865A CN 109852865 A CN109852865 A CN 109852865A CN 201910164103 A CN201910164103 A CN 201910164103A CN 109852865 A CN109852865 A CN 109852865A
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- cemented carbide
- mold
- carbide material
- heat resistant
- wear resistant
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Abstract
The invention discloses a kind of mold heat resistant and wear resistant cemented carbide materials and preparation method thereof comprising the alloy compositions of following weight percent: WC 87.3~88.2%, Co 11.8~12.2%, VC 0.2~0.4%, Cr3C20.5~0.7%, the sum of each component is 100%.A kind of mold heat resistant and wear resistant cemented carbide material of the present invention, the adjustment of technique is designed and prepared by being reasonably formulated, make prepared cemented carbide material that there is the wear-resisting property under good high temperature resistance and high temperature, mold can be effectively prevent to occur tooth during preparing riffled tube, collapse phenomena such as tooth or odontotripsis are serious, substantially increase the service life of mold, and the internal screw thread product depth of thread consistency especially prepared is high, and quality is stablized.
Description
Technical field
The present invention relates to Metal mould material fields, more particularly to a kind of mold heat resistant and wear resistant cemented carbide material
And preparation method thereof.
Background technique
Mold for producing outer light internal tooth screwed pipe needs under the mal-conditions such as high temperature, high pressure, abrasion and heat fatigue
Metal stock is formed to the outer light internal tooth riffled tube of required shape by rotation and hot-extrusion mold type chamber.With metal base
Expect the difference of material, required extrusion temperature is also different, therefore, the high temperature resistance of internal threads pipe pipe itself, high temperature
Under wearability and toughness reguirements it is also different.
Hard alloy is hard compounds and binding metal one kind made of powder metallurgical technique of refractory metal
Alloy material has a series of excellent performances such as hardness is high, wear-resisting, intensity and toughness are preferable, heat-resisting, corrosion-resistant, is to prepare heat
The ideal material of forging mould, hot-extrusion mold and riffled tube mold.
The existing alloy material for preparing riffled tube mold mostly uses imported product, and price is somewhat expensive, at high temperature
In use, mold is easy to appear serious wear, is easy tooth, collapses the defects of tooth, cause the service life of mold shorter, cost is thrown
Enter higher, and since mold is often worn out, such as checks not in time, it is easy to the depth of thread of riffled tube is influenced, thus shadow
Ring the quality stability of screwed pipe.
Summary of the invention
The invention mainly solves the technical problem of providing a kind of mold heat resistant and wear resistant cemented carbide materials and its system
Preparation Method is able to solve disadvantages mentioned above existing for existing riffled tube mold.
In order to solve the above technical problems, one technical scheme adopted by the invention is that: provide a kind of mold wear-resisting high-ductility
Cemented carbide material comprising the alloy compositions of following weight percent: WC 87.3~88.2%, Co 11.8~12.2%, VC
0.2~0.4%, Cr3C20.5~0.7%, the sum of each component is 100%.
In a preferred embodiment of the present invention, the average grain diameter of the WC is 0.8~0.85 μm.
In order to solve the above technical problems, another technical solution used in the present invention is: providing a kind of mold high temperature resistant
The preparation method of wearable hard alloy material, includes the following steps:
(1) ingredient: by WC, Co, VC and Cr3C2It is weighed by above-mentioned formula ratio, it is spare；
(2) ground and mixed: above-mentioned material is sequentially added in ball milling bucket, and a certain amount of solvent naphtha is then added, and mixed grinding obtains
The wet-milling slurry of certain partial size；
(3) drying and screening: low melt point paraffin being added into wet-milling slurry obtained in step (2), and stirring makes above-mentioned wet-milling slurry
It is dry, 400 meshes are then crossed, impurity is filtered out；
(4) compression moulding: being sieved, treated expects that grain is pressed, and obtains semi-finished product；
(5) sinter molding: pressed semi-finished product are put into sintering furnace, are sintered under inert atmosphere conditions through high-temperature pressurizing
Afterwards, cooling obtains the mold high temperature toughness cemented carbide material.
In a preferred embodiment of the present invention, in the step (2), the additional amount of the solvent naphtha be the WC, Co,
VC and Cr3C2The 1/4~1/3 of gross mass；The process conditions of the mixed grinding are as follows: 6~8:1 of ratio of grinding media to material, Ball-milling Time be 36~
48h, the average grain diameter of gained wet-milling slurry are 2~5 μm.
In a preferred embodiment of the present invention, in the step (5), the process conditions of the sintering are as follows: in inertia argon
Gas atmosphere under the pressure condition of 8~12MPa, first rises to 800~1000 DEG C from room temperature with the heating rate of 3~5 DEG C/min, permanent
Temperature keeps 60~90min, 1300~1350 DEG C is then warming up to from 800~1000 DEG C with the heating rate of 8~10 DEG C/min, perseverance
Temperature keeps 30~45min.
In a preferred embodiment of the present invention, in the step (5), the process conditions of the cooling are as follows: in inertia argon
Gas atmosphere under the pressure condition of 5~8MPa, is first cooled to 500 from 1300~1350 DEG C with the rate of temperature fall of 10~20 DEG C/min
~600 DEG C, constant temperature keeps 1~2h, then inert argon atmosphere, cooled to room temperature under condition of normal pressure.
The beneficial effects of the present invention are: a kind of mold heat resistant and wear resistant cemented carbide material of the present invention, by reasonable
Formula designs and prepares the adjustment of technique, has prepared cemented carbide material under good high temperature resistance and high temperature
Wear-resisting property can effectively prevent mold to occur tooth during preparing riffled tube, collapse phenomena such as tooth or odontotripsis are serious,
The service life of mold is substantially increased, and the internal screw thread product depth of thread consistency especially prepared is high, quality is stablized.
Detailed description of the invention
Fig. 1 is the metallographic microscope figure that a kind of mold heat resistant and wear resistant cemented carbide material of the present invention amplifies 1500 times.
Specific embodiment
The preferred embodiments of the present invention will be described in detail with reference to the accompanying drawing, so that advantages and features of the invention energy
It is easier to be readily appreciated by one skilled in the art, so as to make a clearer definition of the protection scope of the present invention.
The embodiment of the present invention includes:
Present invention discloses a kind of mold heat resistant and wear resistant cemented carbide materials and preparation method thereof, wherein the mold is used
Heat resistant and wear resistant cemented carbide material includes the alloy compositions of following weight percent: WC 87.3~88.2%, Co 11.8~
12.2%, VC 0.2~0.4%, Cr3C20.5~0.7%, the sum of each component is 100%.
The average grain diameter of the WC particle is 0.8~0.85 μm.
A kind of above-mentioned mold preparation method of heat resistant and wear resistant cemented carbide material, specifically comprises the following steps:
(1) ingredient: by WC, Co, VC and Cr3C2It is weighed by above-mentioned formula ratio, it is spare；
(2) ground and mixed: weighed material in step (1) is added sequentially in ball milling bucket, then add account for the WC,
Co, VC and Cr3C21/4~1/3 solvent naphtha of gross mass, 36~48h of mixed grinding, is put down under the ratio of grinding media to material of 6~8:1
The wet-milling slurry that equal partial size is 2~5 μm；
(3) drying and screening: appropriate low melt point paraffin being added into wet-milling slurry obtained in step (2), and stirring makes above-mentioned wet-milling
Slurry is dry, crosses 400 meshes, then to filter out impurity；
(4) compression moulding: being sieved in step (3), treated expects that grain is pressed, and obtains semi-finished product；
(5) sinter molding: pressed semi-finished product in step (4) are put into sintering furnace, under inert atmosphere conditions through high temperature
After pressure sintering, cooling obtains the mold high temperature toughness cemented carbide material.
Specifically, the process conditions of the sintering in step (5) are as follows: in inert argon atmosphere, the pressure of 8~12MPa
Under the conditions of, 800~1000 DEG C first are increased to from room temperature with the heating rate of 3~5 DEG C/min, constant temperature keeps 60~90min, then
1300~1350 DEG C are warming up to from 800~1000 DEG C with the heating rate of 8~10 DEG C/min, constant temperature keeps 30~45min；
The process conditions of the cooling in step (5) are as follows: under inert argon atmosphere, the pressure condition of 5~8MPa, first with 10
The rate of temperature fall of~20 DEG C/min is cooled to 500~600 DEG C from 1300~1350 DEG C, and constant temperature keeps 1~2h, then in inertia argon
Cooled to room temperature under conditions of gas atmosphere and normal pressure.
The mold heat resistant and wear resistant cemented carbide material of above method preparation, can be under 1300 DEG C or more of hot environment
Use, after tested, physical property is as follows: hardness is 90~95HRD；Tensile strength is 3600~3800N/mm2；Density is 14
~16g/cm3, wear-resisting property promotes 8~10% compared with current material.
Embodiment 1
By taking the mold heat resistant and wear resistant cemented carbide material for configuring 100kg as an example.
Weigh WC particle 87.3kg, Co powder 11.8kg, VC 0.2kg, Cr that average grain diameter is 0.8 μm3C20.7kg, so
After be added sequentially in ball milling bucket, then again thereto be added 35kg solvent naphtha, mixed grinding 48h, obtain average grain diameter be 2
~4 μm of wet-milling slurry adds appropriate low melt point paraffin, stirs drying, the mixture after drying is crossed 400 meshes, with filter
Except impurity therein, then by the semi-finished product of shape required for being pressed into requirement, using high-temperature pressurizing sinter molding, after cooling
Obtain the cemented carbide material.
Specifically, the process conditions of the sintering are as follows: under conditions of inert argon atmosphere and 8~12MPa pressure, first
Rise to 1000 DEG C from room temperature with the heating rate of 5 DEG C/min, constant temperature keeps 60min, then with the heating rate of 10 DEG C/min from
800~1000 DEG C are warming up to 1300~1350 DEG C, and constant temperature keeps 30min；
The process conditions of the cooling are as follows: under conditions of inert argon atmosphere and 5~8MPa pressure, first with 20 DEG C/min's
Rate of temperature fall is cooled to 500~600 DEG C from 1300~1350 DEG C, and constant temperature keeps 2h, then in inert argon atmosphere and normal pressure
Under conditions of cooled to room temperature.
A kind of mold heat resistant and wear resistant cemented carbide material of the present invention, uses particle WC for primary raw material, due to particle
WC not only has the wear-resisting property under good high temperature resistance and high temperature, while its corrosion resistance and chipping resistance can be all non-
Chang Zhuoyue can be effectively prevent in riffled tube forming process, and mold falls tooth, collapses phenomena such as tooth or odontotripsis are serious, thus
Improve the service life of mold and the quality of molding riffled tube.The mold is amplified with heat resistant and wear resistant cemented carbide material
1500 times of metallographic microscope figure is as shown in Figure 1.
Mold heat resistant and wear resistant cemented carbide material made from the above method, after tested, mechanical performance are as follows: hard
Degree is 91.6 ± 0.5HRD；Tensile strength is 3600N/mm2；Density is 14.15 ± 0.1g/cm3, wear-resisting property is compared with current material
Promote 8.5%.
A kind of mold heat resistant and wear resistant cemented carbide material and preparation method thereof of the present invention is set by reasonably formula
The adjustment of meter and preparation process, the especially selection of recipe ingredient and the adjustment of dosage, high-temperature pressurizing sintering forming process and
The design of cooling technique makes prepared cemented carbide material have the wearability under good high temperature resistance and applied at elevated temperature
Can, mold can be effectively prevented and occur tooth during preparing riffled tube, collapse phenomena such as tooth or odontotripsis are serious, thus
The service life of mold is substantially increased, and using the internal screw thread product of this mold preparation, depth of thread consistency is high,
Quality is stablized.
In the description of the present invention, it should be noted that the instruction such as term " on ", "lower", "left", "right", "inner", "outside"
Orientation or positional relationship be based on the orientation or positional relationship shown in the drawings or the invention product using when usually put
Orientation or positional relationship, be merely for convenience of description of the present invention and simplification of the description, rather than the device of indication or suggestion meaning
Or element must have a particular orientation, be constructed and operated in a specific orientation, therefore be not considered as limiting the invention.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, and comes for those skilled in the art
It says, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any modification, equivalent
Replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (6)
1. a kind of mold heat resistant and wear resistant cemented carbide material, which is characterized in that it includes the alloy of following weight percent
Component: WC 87.3~88.2%, Co 11.8~12.2%, VC 0.2~0.4%, Cr3C20.5~0.7%, the sum of each component is
100%。
2. mold according to claim 1 heat resistant and wear resistant cemented carbide material, which is characterized in that the WC's is averaged
Partial size is 0.8~0.85 μm.
3. a kind of preparation method of mold as claimed in claim 1 or 2 heat resistant and wear resistant cemented carbide material, feature exist
In including the following steps:
(1) ingredient: by WC, Co, VC and Cr3C2It is weighed by above-mentioned formula ratio, it is spare；
(2) ground and mixed: above-mentioned material is sequentially added in ball milling bucket, and a certain amount of solvent naphtha is then added, and mixed grinding obtains
The wet-milling slurry of certain partial size；
(3) drying and screening: low melt point paraffin being added into wet-milling slurry obtained in step (2), and stirring makes above-mentioned wet-milling slurry
It is dry, 400 meshes are then crossed, impurity is filtered out；
(4) compression moulding: being sieved, treated expects that grain is pressed, and obtains semi-finished product；
(5) sinter molding: pressed semi-finished product are put into sintering furnace, are sintered under inert atmosphere conditions through high-temperature pressurizing
Afterwards, cooling obtains the mold high temperature toughness cemented carbide material.
4. the mold according to claim 3 preparation method of heat resistant and wear resistant cemented carbide material, which is characterized in that institute
It states in step (2), the additional amount of the solvent naphtha is described WC, Co, VC and Cr3C2The 1/4~1/3 of gross mass；The mixing is ground
The process conditions of mill are as follows: 6~8:1 of ratio of grinding media to material, Ball-milling Time are 36~48h, and the average grain diameter of gained wet-milling slurry is 2~5 μm.
5. the mold according to claim 3 preparation method of heat resistant and wear resistant cemented carbide material, which is characterized in that institute
It states in step (5), the process conditions of the sintering are as follows: under inert argon atmosphere, the pressure condition of 8~12MPa, first with 3~5
DEG C/heating rate of min from room temperature rises to 800~1000 DEG C, constant temperature keeps 60~90min, then with the liter of 8~10 DEG C/min
Warm speed is warming up to 1300~1350 DEG C from 800~1000 DEG C, and constant temperature keeps 30~45min.
6. the mold according to claim 3 preparation method of heat resistant and wear resistant cemented carbide material, which is characterized in that institute
State in step (5), the process conditions of the cooling are as follows: under inert argon atmosphere, the pressure condition of 5~8MPa, first with 10~
The rate of temperature fall of 20 DEG C/min is cooled to 500~600 DEG C from 1300~1350 DEG C, and constant temperature keeps 1~2h, then inert argon gas
Atmosphere, cooled to room temperature under condition of normal pressure.
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| CN201910164103.4A CN109852865A (en) | 2019-03-05 | 2019-03-05 | A kind of mold heat resistant and wear resistant cemented carbide material and preparation method thereof |
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| CN201910164103.4A CN109852865A (en) | 2019-03-05 | 2019-03-05 | A kind of mold heat resistant and wear resistant cemented carbide material and preparation method thereof |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1269842A (en) * | 1997-09-05 | 2000-10-11 | 桑德维克公司 | Method of making ultrafine Wc-Co alloys |
| CN1480545A (en) * | 2003-07-22 | 2004-03-10 | 株洲硬质合金集团有限公司 | Method for preparing superfine hard alloy |
| CN102994792A (en) * | 2012-12-10 | 2013-03-27 | 湖南世纪特种合金有限公司 | Preparation method for high-strength and high-hardness nanocrystalline tungstate-cobalt hard alloy |
| CN103614603A (en) * | 2013-12-09 | 2014-03-05 | 株洲硬质合金集团有限公司 | Hard alloy with grain size of less than 200nm and preparation method thereof |
| CN105734321A (en) * | 2016-03-01 | 2016-07-06 | 株洲硬质合金集团有限公司 | Preparing method for ultra-fine hard alloy |
-
2019
- 2019-03-05 CN CN201910164103.4A patent/CN109852865A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1269842A (en) * | 1997-09-05 | 2000-10-11 | 桑德维克公司 | Method of making ultrafine Wc-Co alloys |
| CN1480545A (en) * | 2003-07-22 | 2004-03-10 | 株洲硬质合金集团有限公司 | Method for preparing superfine hard alloy |
| CN102994792A (en) * | 2012-12-10 | 2013-03-27 | 湖南世纪特种合金有限公司 | Preparation method for high-strength and high-hardness nanocrystalline tungstate-cobalt hard alloy |
| CN103614603A (en) * | 2013-12-09 | 2014-03-05 | 株洲硬质合金集团有限公司 | Hard alloy with grain size of less than 200nm and preparation method thereof |
| CN105734321A (en) * | 2016-03-01 | 2016-07-06 | 株洲硬质合金集团有限公司 | Preparing method for ultra-fine hard alloy |
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Application publication date: 20190607 |
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