CN103834823A - Preparation method for cemented carbide product - Google Patents
Preparation method for cemented carbide product Download PDFInfo
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- CN103834823A CN103834823A CN201310685358.8A CN201310685358A CN103834823A CN 103834823 A CN103834823 A CN 103834823A CN 201310685358 A CN201310685358 A CN 201310685358A CN 103834823 A CN103834823 A CN 103834823A
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Abstract
The invention provides a preparation method for a cemented carbide product. According to the preparation method, ultrafine mixed powder with specific components is adopted; a trace amount of metal Mo element is added to increase wettability and heat conductivity of the alloy; a trace amount of Y(NO)3 is added to play a purifying effect; and a trace amount of VC and Cr3C2 is added as a grain growth inhibitor to inhibit the growth of grains. On the premise of meeting the proportion relationships limited by the invention, the mixed powder is successively subjected to process steps of compression molding, isostatic cool pressing, atmosphere dewaxing, vacuum sintering and hot isostatic pressing, thereby effectively eliminating residual pores in the cemented carbide product, improving texture structure of the material and increasing properties of the material. The strength, hardness and service life of a finally produced cemented carbide product, particularly a large size cemented carbide holding-up hammer, are greatly increased.
Description
Technical field
The hard alloy top hammer that the present invention relates to a kind of preparation method of fine grained cemented carbide goods and utilize the method to prepare, relates in particular to a kind of preparation method of large size submicrometer hard alloy top hammer, belongs to Wimet and prepares technical field.
Background technology
Wimet is described as " industrial tooth ", for the manufacture of cutting tool, cutter, mould and wear-resisting spare part, is widely used in the fields such as military project, space flight and aviation, mechanical workout, metallurgy, petroleum drilling, mine instrument, telecommunications, building.At present, the Wimet market requirement continues to increase, and wherein WC base cemented carbide is widely used.Along with WC grain refinement, the mechanical property of material can obtain very significantly promoting.But there are three technological difficulties in the preparation of ultrafine WC base cemented carbide: the first, the easy oxygenation of superfine powder, after sintering, cause alloy decarburization on the one hand, oxygen is present on crystal boundary on the other hand, reduces the wettability of the relative WC particle of cobalt, thereby weakens crystal boundary; The second, when the sintering motivating force of superfine powder increase, sintering activating energy reduction, sintering, be difficult to effectively suppress growing up of WC grain, have the phenomenon of WC grain abnormal growth; Three, the fine and close resistance of Ultra-fine Grained is large, is difficult to eliminate completely residual porosity.Above-mentioned three technological difficulties have suppressed the further raising of the performances such as WC base cemented carbide intensity, have limited its application.
Take the preparation method of ordinary rigid alloy top hammer as example, its preparation method is to adopt micron order WC powder to add 8wt.% cobalt caking agent, make blank hammer through batch mixing, compression molding and low pressure sintering, then process and nondestructive testing through machining, stress relief annealing, obtain final product.Owing to sintered part having been applied in low pressure sintering process the atmospheric pressure of 4～10MPa, greatest diametrical dimension is significantly improved lower than the small-medium size top hammer density of 175mm, void content reduces, and use properties and life-span can meet need of production.
For example, a kind of preparation method of top hammer is disclosed in prior art, it is take submicron WC as raw material, add suitable grain growth inhibitor, pass through low pressure sintering, prepare the hard alloy top hammer that low-alloy hole, cross-breaking strength are greater than 3200MPa, this kind of preparation method is significantly improved the life-span of small size top hammer.
But, above-mentioned technique is in the preparation that is applied to large size top hammer time, because the pressure of low pressure sintering is lower, deficiency so that the hole in material eliminate completely, in addition, superfine powder exists oxygen level to increase, and causes alloy thing phase and grain-boundary weakness, therefore material property cannot reach use desired result, thereby has limited the application of this technique in large size top hammer.
Summary of the invention
Therefore, the technical problem to be solved in the present invention is, reduce the oxygen level increase that existing hard alloy production process occurs on preparation large size, thin brilliant goods and make alloy decarburization, grain-boundary weakness phenomenon, the defect that overcome that residual porosity rate is higher, density is lower, grain-size abnormal growth etc. affects the strength of materials and other performance, thereby provide, a kind of density is high, microtexture is even, the Wimet large size top hammer of the large size goods, particularly high work-ing life that cross-breaking strength, hardness are greatly improved.
For this reason, the invention provides a kind of preparation method of hard metal article, it is characterized in that: comprise the following steps of carrying out successively:
S1: mixed powder is placed on to ball milling in ball mill, and described mixed powder comprises the component of following weight percentage: 89% ~ 92% WC, 10.5% ~ 7.5% Co, 0.1% ~ 0.5% Mo, 0.01% ~ 0.05% Y (NO3)
3, surplus is VC and Cr
3c
2;
S2: described mixed powder is put into mould mold pressing and form workpiece pressed compact;
S3: described workpiece pressed compact is carried out to isostatic cool pressing processing;
S4: described workpiece is carried out to atmosphere dewaxing;
S5: described workpiece is carried out to vacuum sintering;
S6: described workpiece is carried out to hip treatment;
S7: described workpiece is carried out to machining and stress relief annealing, form hard metal article.
In described step S1, the particle diameter of WC powder is 0.3 ~ 0.7 μ m, and the particle diameter of Co powder is 0.4 ~ 0.8 μ m.
In described step S1, Ball-milling Time is 48 ~ 72h, ball milling envrionment temperature span of control-5 ~ 5 ℃.
In described step S1, after described mixed powder adds described ball mill, mix paraffin and add dehydrated alcohol to carry out ball milling, adding the weight of described paraffin is 1.5% ~ 2.5% of described mixed powder weight, carries out vacuum stirring and be dried after ball milling.
In described step S2, the pressure range of described mold pressing is 160 ~ 200 MPa.
In described step S3, the pressure range of described isostatic cool pressing processing is 100 ~ 250MPa.
In described step S4, the temperature range of described dewaxing treatment is 300 ~ 450 ℃, and soaking time is 25 ~ 60h.
In described step S4, the atmosphere of described dewaxing treatment is hydrogen or vacuum.
In described step S5, the temperature range of described vacuum sintering is 1320 ~ 1410 ℃, and soaking time scope is 0.5 ~ 5h.
Described step S4 and described step S5 carry out in dewaxing vacuum sintering all-in-one oven.
In described step S6, the temperature range of described hip treatment is 1300 ~ 1420 ℃, and soaking time is 0.5 ~ 3h.
Described hip treatment is carried out in argon gas or nitrogen atmosphere, and the pressure range of described argon gas or nitrogen gas generation is 50 ~ 200MPa.
In described step S7, described Stress –relieving Annealing Temperature scope is 200 ~ 350 ℃, and soaking time scope is 20 ~ 60h.
The hard alloy top hammer that utilizes the preparation method described in above-mentioned any one to be prepared from, diameter is not less than 175mm.
Wimet preparation method provided by the invention has the following advantages:
1. the preparation method of hard metal article provided by the invention, the ultra-fine mixed powder of employing specific components, adding micro-metal M o element increases wettability and the thermal conductivity of alloy, adds micro-Y (NO3)
3play and purify and the effect of strengthening crystal boundary, add micro-VC and Cr
3c
2as the inhibitor of grain growth, suppress growing up of crystal grain.
2. the preparation method of hard metal article provided by the invention, when ball milling, mix 1.5% ~ 2.5% paraffin, make it to be wrapped in around Co particle, prevent raw material oxidation, simultaneously ball mill is in the low temperature environment of-5 ~ 5 ℃, further stop raw material oxidation, Ball-milling Time is that 48 ~ 72h is that good basis is laid in the preparation of material in subsequent process steps.
3. the preparation method of hard metal article provided by the invention, strict temperature, time and the pressure condition of controlling processing step and each processing step, the pressure range of described mold pressing is 160 ~ 200 MPa, the pressure range of isostatic cool pressing processing is 100 ~ 250MPa, the temperature range of described dewaxing treatment is 300 ~ 450 ℃, soaking time is 25 ~ 60h, the temperature range of described vacuum sintering is 1320 ~ 1410 ℃, soaking time scope is 0.5 ~ 5h, the temperature range of described hip treatment is 1300 ~ 1420 ℃, and soaking time is 0.5 ~ 3h.Above-mentioned processing step and processing parameter merge mutually, controlled on the whole the phenomenon of growing up of crystal grain in preparation process, have eliminated intercrystalline hole, have purified crystal boundary, have strengthened grain-boundary strength.After isostatic cool pressing and the presintering of vacuum liquid phase, workpiece relative density reaches more than 98%; Workpiece after sintering is under the hot isostatic pressing condition of high temperature, high pressure, and internal void is to external migration, and material continues densification, basically eliminate residual porosity; Vacuum sintering and hip treatment temperature are all lower than normal sintering method, hard phase WC grain abnormal growth is inhibited, the final equally distributed structure of submicron order two-phase structure that obtains, intensity, hardness and the toughness of material are improved simultaneously, and cross-breaking strength increase rate exceedes 30%.
4. the preparation method of hard metal article provided by the invention, be particularly useful for the preparation that diameter is not less than the hard alloy top hammer of 175mm, the pressed compact of hard alloy top hammer exceedes 98% through vacuum presintering relative density, thing is mutually pure, when hot isostatic pressing, without jacket, sintering pressed compact is after hip treatment, and density approaches 100%, for uniform two-phase structure, imporosity and defect, the metallograph of material is shown in Fig. 2.Hip temperature is lower, has suppressed WC grain and has grown up, and microstructure, without thick WC grain, distributes without " cobalt pond "; average grain size is less than 1 μ m, and cross-breaking strength is greater than 4000MPa, and numerical value improves more than 30%; product is stable, and higher than 8000 times, be applicable to large-scale production work-ing life.The stereoscan photograph of top hammer is shown in Fig. 3.Table 2 is for utilizing the performance synopsis of top hammer prepared by Wimet workpiece preparation method provided by the invention and the top hammer of utilizing traditional preparation method to prepare.
Accompanying drawing explanation
For content of the present invention is more likely to be clearly understood, below according to a particular embodiment of the invention and by reference to the accompanying drawings, the present invention is further detailed explanation, wherein
Fig. 1 is the hard alloy top hammer preparation method's that provides of embodiments of the invention 1 process route chart;
Fig. 2 is the metallograph of the hard alloy top hammer prepared of the preparation technology that utilizes embodiment 1 to provide;
Fig. 3 is the stereoscan photograph of the hard alloy top hammer prepared of the preparation technology that utilizes embodiment 1 to provide.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is elaborated.Should be understood that, embodiment described herein only, for description and interpretation the present invention, is not limited to the present invention.
embodiment 1
As shown in Figure 1, the present embodiment provides a kind of preparation technology of hard alloy top hammer, comprises the following steps of carrying out successively:
S1: first mixed powder is put into ball mill, described mixed powder comprises the component of following weight percentage: 89% WC, 10.5% Co, 0.2% Mo, 0.01% Y (NO3)
3, surplus is VC and Cr
3c
2the particle diameter of WC powder is 0.3 μ m, and the particle diameter of Co powder is 0.4 μ m, then mixes the paraffin that weight is mixed powder 2%, make it to be wrapped in around Co particle, anti-oxidation, and add dehydrated alcohol to carry out ball milling, Ball-milling Time is 48h, ball milling envrionment temperature is the low temperature environment of-5 ℃, prevent raw material oxidation, after ball milling, adopt vacuum stirring dry, paraffin is mixed;
S2: the mixed powder after ball milling is put into mould and carry out mold pressing, form workpiece pressed compact, the pressure of described mold pressing is 160MPa;
S3: the workpiece pressed compact that mold pressing is obtained is put into isostatic cool pressing equipment and carried out isostatic cool pressing processing, makes the even density of workpiece, and the pressure of described isostatic cool pressing processing is 120MPa;
S4: will carry out dewaxing treatment through the workpiece of isostatic cool pressing processing, the temperature of described dewaxing treatment is 300 ℃, and soaking time is 60h, and the atmosphere of described dewaxing treatment is hydrogen;
S5: the workpiece after dewaxing treatment is carried out to vacuum sintering processing, and the temperature of described vacuum sintering is 1380 ℃, and soaking time is 0.5h;
S6: the described workpiece after vacuum sintering is carried out to hip treatment, and the temperature of described hip treatment is 1320 ℃, and soaking time is 2.5h, and described hip treatment is carried out in nitrogen atmosphere, and the pressure of described nitrogen is 50MPa;
S7: the workpiece through hip treatment is carried out to machining and stress relief annealing processing, and described stress relief annealing temperature is 200 ℃, and soaking time is 60h, to form the hard alloy top hammer of diameter as 175mm.
In the present embodiment, described dewaxing treatment and described vacuum sintering are carried out in dewaxing vacuum sintering all-in-one oven.
Utilize the metallograph of the hard alloy top hammer of preparation method's production of the present embodiment to see Fig. 2, the stereoscan photograph of top hammer is shown in Fig. 3, and performance data is in table 2.
embodiment 2
The present embodiment provides a kind of preparation technology of hard alloy top hammer, comprises the following steps of carrying out successively:
S1: first mixed powder is put into ball mill, described mixed powder comprises the component of following weight percentage: 91.2% WC, 8.5% Co, 0.1% Mo, 0.02% Y (NO3)
3, surplus is VC and Cr
3c
2the particle diameter of WC powder is 0.4 μ m, and the particle diameter of Co powder is 0.5 μ m, then mixes the paraffin that weight is mixed powder 1.5%, make it to be wrapped in around Co particle, anti-oxidation, and add dehydrated alcohol to carry out ball milling, Ball-milling Time is 54h, ball milling envrionment temperature is the low temperature environment of-2 ℃, prevent raw material oxidation, after ball milling, adopt vacuum stirring dry, paraffin is mixed;
S2: the mixed powder after ball milling is put into mould and carry out mold pressing, form workpiece pressed compact, the pressure of described mold pressing is 170 MPa;
S3: the workpiece pressed compact that mold pressing is obtained is put into isostatic cool pressing equipment and carried out isostatic cool pressing processing, makes the even density of workpiece, and the pressure of described isostatic cool pressing processing is 100MPa;
S4: will carry out dewaxing treatment through the workpiece of isostatic cool pressing processing, the temperature of described dewaxing treatment is 350 ℃, and soaking time is 58h,, the atmosphere of described dewaxing treatment is vacuum;
S5: the workpiece after dewaxing treatment is carried out to vacuum sintering processing, and the temperature of described vacuum sintering is 1380 ℃, and soaking time is 5h;
S6: the described workpiece after vacuum sintering is carried out to hip treatment, and the temperature of described hip treatment is 1300 ℃, and soaking time is 2.5h, and described hip treatment is carried out in nitrogen atmosphere, and the pressure of described nitrogen gas generation is 60MPa;
S7: the workpiece through hip treatment is carried out to machining and stress relief annealing processing, and described stress relief annealing temperature is 220 ℃, and soaking time is 55h, to form the hard alloy top hammer of diameter as 188mm.
In the present embodiment, described dewaxing treatment and described vacuum sintering are carried out in dewaxing vacuum sintering all-in-one oven.
Utilize the performance data of hard alloy top hammer that the preparation method of the present embodiment produces in table 2.
embodiment3
The present embodiment provides a kind of preparation technology of hard alloy top hammer, comprises the following steps of carrying out successively:
S1: first mixed powder is put into ball mill, described mixed powder comprises the component of following weight percentage: 90% WC, 9.4% Co, 0.4% Mo, 0.03% Y (NO3)
3, surplus is VC and Cr
3c
2the particle diameter of WC powder is 0.5 μ m, and the particle diameter of Co powder is 0.6 μ m, then mixes the paraffin that weight is mixed powder 2.3%, make it to be wrapped in around Co particle, anti-oxidation, and add dehydrated alcohol to carry out ball milling, Ball-milling Time is 55h, ball milling envrionment temperature is the low temperature environment of-1 ℃, prevent raw material oxidation, after ball milling, adopt vacuum stirring dry, paraffin is mixed;
S2: the mixed powder after ball milling is put into mould and carry out mold pressing, form workpiece pressed compact, the pressure of described mold pressing is 180 MPa;
S3: the workpiece pressed compact that mold pressing is obtained is put into isostatic cool pressing equipment and carried out isostatic cool pressing processing, makes the even density of workpiece, and the pressure of described isostatic cool pressing processing is 150MPa;
S4: will carry out dewaxing treatment through the workpiece of isostatic cool pressing processing, the temperature of described dewaxing treatment is 380 ℃, and soaking time is 50h,, described dewaxing treatment is carried out in a vacuum;
S5: the workpiece after dewaxing treatment is carried out to vacuum sintering processing, and the temperature of described vacuum sintering is 1410 ℃, and soaking time is 3h;
S6: the described workpiece after vacuum sintering is carried out to hip treatment, and the temperature of described hip treatment is 1340 ℃, and soaking time is 2h, and described hip treatment is carried out in nitrogen atmosphere, and the pressure of described argon gas or nitrogen gas generation is 90MPa;
S7: the workpiece through hip treatment is carried out to machining and stress relief annealing processing, and described stress relief annealing temperature is 240 ℃, and soaking time is 50h, to form the hard alloy top hammer of diameter as 199mm.
In the present embodiment, described dewaxing treatment and described vacuum sintering are carried out in dewaxing vacuum sintering all-in-one oven.
Utilize the performance data of hard alloy top hammer that the preparation method of the present embodiment produces in table 2.
embodiment 4
The present embodiment provides a kind of preparation technology of hard alloy top hammer, comprises the following steps of carrying out successively:
S1: first mixed powder is put into ball mill, described mixed powder comprises the component of following weight percentage: 92% WC, 7.5% Co, 0.3% Mo, 0.04% Y (NO3)
3, surplus is VC and Cr
3c
2the particle diameter of WC powder is 0.7 μ m, and the particle diameter of Co powder is 0.8 μ m, then mixes the paraffin that weight is mixed powder 1.8%, make it to be wrapped in around Co particle, anti-oxidation, and add dehydrated alcohol to carry out ball milling, Ball-milling Time is 60h, ball milling envrionment temperature is the low temperature environment of 0 ℃, prevent raw material oxidation, after ball milling, adopt vacuum stirring dry, paraffin is mixed;
S2: the mixed powder after ball milling is put into mould and carry out mold pressing, form workpiece pressed compact, the pressure of described mold pressing is 190 MPa;
S3: the workpiece pressed compact that mold pressing is obtained is put into isostatic cool pressing equipment and carried out isostatic cool pressing processing, makes the even density of workpiece, and the pressure of described isostatic cool pressing processing is 180MPa;
S4: will carry out dewaxing treatment through the workpiece of isostatic cool pressing processing, the temperature of described dewaxing treatment is 400 ℃, and soaking time is 28h,, the atmosphere of described dewaxing treatment is vacuum;
S5: the workpiece after dewaxing treatment is carried out to vacuum sintering processing, and the temperature of described vacuum sintering is 1400 ℃, and soaking time is 2h;
S6: the described workpiece after vacuum sintering is carried out to hip treatment, and the temperature of described hip treatment is 1380 ℃, and soaking time is 1h, and described hip treatment is carried out in nitrogen atmosphere, and the pressure of described nitrogen gas generation is 130MPa;
S7: the workpiece through hip treatment is carried out to machining and stress relief annealing processing, and described stress relief annealing temperature is 280 ℃, and soaking time is 40h, to form the hard alloy top hammer of diameter as 175mm.
In the present embodiment, described dewaxing treatment and described vacuum sintering are carried out in dewaxing vacuum sintering all-in-one oven.
Utilize the performance data of hard alloy top hammer that the preparation method of the present embodiment produces in table 2.
embodiment 5
The present embodiment provides a kind of preparation technology of hard alloy top hammer, comprises the following steps of carrying out successively:
S1: first mixed powder is put into ball mill, described mixed powder comprises the component of following weight percentage: 89.5% WC, 9.8% Co, 0.5% Mo, 0.045% Y (NO3)
3, surplus is VC and Cr
3c
2the particle diameter of WC powder is 0.5 μ m, and the particle diameter of Co powder is 0.6 μ m, then mixes the paraffin that weight is mixed powder 2.5%, make it to be wrapped in around Co particle, anti-oxidation, and add dehydrated alcohol to carry out ball milling, Ball-milling Time is 65h, ball milling envrionment temperature is the low temperature environment of 2 ℃, prevent raw material oxidation, after ball milling, adopt vacuum stirring dry, paraffin is mixed;
S2: the mixed powder after ball milling is put into mould and carry out mold pressing, form workpiece pressed compact, the pressure of described mold pressing is 200 MPa;
S3: the workpiece pressed compact that mold pressing is obtained is put into isostatic cool pressing equipment and carried out isostatic cool pressing processing, makes the even density of workpiece, and the pressure of described isostatic cool pressing processing is 200MPa;
S4: will carry out dewaxing treatment through the workpiece of isostatic cool pressing processing, the temperature of described dewaxing treatment is 450 ℃, and soaking time is 25h,, the atmosphere of described dewaxing treatment is vacuum;
S5: the workpiece after dewaxing treatment is carried out to vacuum sintering processing, and the temperature of described vacuum sintering is 1380 ℃, and soaking time is 5h;
S6: the described workpiece after vacuum sintering is carried out to hip treatment, and the temperature of described hip treatment is 1420 ℃, and soaking time is 0.5h, and described hip treatment is carried out in nitrogen atmosphere, and the pressure of nitrogen gas generation is 200MPa;
S7: the workpiece through hip treatment is carried out to machining and stress relief annealing processing, and described stress relief annealing temperature is 300 ℃, and soaking time is 30h, to form the hard alloy top hammer of diameter as 188mm.
In the present embodiment, described dewaxing treatment and described vacuum sintering are carried out in dewaxing vacuum sintering all-in-one oven.
Utilize the performance data of hard alloy top hammer that the preparation method of the present embodiment produces in table 2.
embodiment 6
The present embodiment provides a kind of preparation technology of hard alloy top hammer, comprises the following steps of carrying out successively:
S1: first mixed powder is put into ball mill, described mixed powder comprises the component of following weight percentage: 89% WC, 10.5% Co, 0.3% Mo, the Y (NO3) of 0.05 %
3, surplus is VC and Cr
3c
2the particle diameter of WC powder is 0.5 μ m, and the particle diameter of Co powder is 0.6 μ m, then mixes the paraffin that weight is mixed powder 1.8%, make it to be wrapped in around Co particle, anti-oxidation, and add dehydrated alcohol to carry out ball milling, Ball-milling Time is 72h, ball milling envrionment temperature is the low temperature environment of 5 ℃, prevent raw material oxidation, after ball milling, adopt vacuum stirring dry, paraffin is mixed;
S2: the mixed powder after ball milling is put into mould and carry out mold pressing, form workpiece pressed compact, the pressure of described mold pressing is 180 MPa;
S3: the workpiece pressed compact that mold pressing is obtained is put into isostatic cool pressing equipment and carried out isostatic cool pressing processing, makes the even density of workpiece, and the pressure of described isostatic cool pressing processing is 250MPa;
S4: will carry out dewaxing treatment through the workpiece of isostatic cool pressing processing, the temperature of described dewaxing treatment is 450 ℃, and soaking time is 25h, and the atmosphere of described dewaxing treatment is hydrogen;
S5: the workpiece after dewaxing treatment is carried out to vacuum sintering processing, and the temperature of described vacuum sintering is 1320 ℃, and soaking time is 2.5h;
S6: the described workpiece after vacuum sintering is carried out to hip treatment, and the temperature of described hip treatment is 1300 ℃, and soaking time is 3h, and described hip treatment is carried out in argon gas atmosphere, the pressure that described argon gas produces is 200MPa;
S7: the workpiece through hip treatment is carried out to machining and stress relief annealing processing, and described stress relief annealing temperature is 350 ℃, and soaking time is 20h, to form the hard alloy top hammer of diameter as 188mm.
In the present embodiment, described dewaxing treatment and described vacuum sintering are carried out in dewaxing vacuum sintering all-in-one oven.
Utilize the performance data of hard alloy top hammer that the preparation method of the present embodiment produces in table 2.
Table 1 is large size top hammer performance synopsis prepared by patented technology of the present invention and traditional method
| Preparation method | Composition | Density (g/cm 3） | Hardness HRA | Cross-breaking strength (MPa) | (μ m) for grain-size | Work-ing life (inferior) |
| Low pressure sintering (micron raw material) | WC-8Co | 14.7~14.8 | 90.0 | 3200 | 1~2 | 3000 |
| The art of this patent (micron raw material) | WC-8Co | 14.7~14.8 | 90.5 | 3400 | 1~1.5 | 5000 |
| The art of this patent (ultra-fine feed stock) | WC-10Co | 14.3~14.8 | 91.3-92.3 | >4000 | <1 | >8000 |
Table 2 is the performance data that each embodiment prepares large size top hammer
Data from table 1 and table 2 can be found out; the addendum cone that adopts the above embodiment of the present invention to prepare; average grain size is less than 1 μ m; cross-breaking strength is greater than 4000MPa; than traditional technology, strength values improves more than 30%, and product is stable; higher than 8000 times, be applicable to large-scale production work-ing life.
Obviously, above-described embodiment is only for example is clearly described, and the not restriction to embodiment.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here without also giving exhaustive to all embodiments.And the apparent variation of being extended out thus or variation are still among the protection domain in the invention.
Claims (14)
1. a preparation method for hard metal article, is characterized in that: comprise the following steps of carrying out successively:
S1: mixed powder is placed on to ball milling in ball mill, and described mixed powder comprises the component of following weight percentage: 89% ~ 92% WC, 10.5% ~ 7.5% Co, 0.1% ~ 0.5% Mo, 0.01% ~ 0.05% Y (NO3)
3, surplus is VC and Cr
3c
2;
S2: described mixed powder is put into mould mold pressing and form workpiece pressed compact;
S3: described workpiece pressed compact is carried out to isostatic cool pressing processing;
S4: described workpiece is carried out to atmosphere dewaxing;
S5: described workpiece is carried out to vacuum sintering;
S6: described workpiece is carried out to hip treatment;
S7: described workpiece is carried out to machining and stress relief annealing, form hard metal article.
2. according to the preparation method of the hard metal article described in claim 1, it is characterized in that: in described step S1, the particle diameter of WC powder is 0.3 ~ 0.7 μ m, and the particle diameter of Co powder is 0.4 ~ 0.8 μ m.
3. according to the preparation method of the hard metal article described in any one in claim 1 ~ 2, it is characterized in that: in described step S1, Ball-milling Time is 48 ~ 72h, ball milling envrionment temperature span of control-5 ~ 5 ℃.
4. according to the preparation method of the hard metal article described in any one in claim 1 ~ 3, it is characterized in that: in described step S1, after described mixed powder adds described ball mill, mix paraffin and add dehydrated alcohol to carry out ball milling, adding the weight of described paraffin is 1.5% ~ 2.5% of described mixed powder weight, carries out vacuum stirring and be dried after ball milling.
5. according to the preparation method of the hard metal article described in claim 1 ~ 4, it is characterized in that: in described step S2, the pressure range of described mold pressing is 160 ~ 200 MPa.
6. according to the preparation method of the hard metal article described in any one in claim 1 ~ 5, it is characterized in that: in described step S3, the pressure range of described isostatic cool pressing processing is 100 ~ 250MPa.
7. according to the preparation method of the hard metal article described in any one in claim 1 ~ 6, it is characterized in that: in described step S4, the temperature range of described dewaxing treatment is 300 ~ 450 ℃, and soaking time is 25 ~ 60h.
8. according to the preparation method of the hard metal article described in any one in claim 1 ~ 7, it is characterized in that: in described step S4, the atmosphere of described dewaxing treatment is hydrogen or vacuum.
9. according to the preparation method of the hard metal article described in any one in claim 1 ~ 8, it is characterized in that: in described step S5, the temperature range of described vacuum sintering is 1320 ~ 1410 ℃, and soaking time scope is 0.5 ~ 5h.
10. according to the preparation method of the hard metal article described in any one in claim 1 ~ 9, it is characterized in that: described step S4 and described step S5 carry out in dewaxing vacuum sintering all-in-one oven.
11. according to the preparation method of the hard metal article described in any one in claim 1 ~ 10, it is characterized in that: in described step S6, the temperature range of described hip treatment is 1300 ~ 1420 ℃, and soaking time is 0.5 ~ 3h.
12. according to the preparation method of the hard metal article described in any one in claim 1 ~ 11, it is characterized in that: described hip treatment is carried out in argon gas or nitrogen atmosphere, and the pressure range of described argon gas or nitrogen gas generation is 50 ~ 200MPa.
13. according to the preparation method of the hard metal article described in any one in claim 1 ~ 12, it is characterized in that: in described step S7, described stress relief annealing temperature range is 200 ~ 350 ℃, and soaking time scope is 20 ~ 60h.
14. according to the preparation method of the hard metal article described in any one in claim 1 ~ 13, it is characterized in that: hard metal article prepared by described preparation method is that diameter is not less than 175mm hard alloy top hammer.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104057271A (en) * | 2014-07-04 | 2014-09-24 | 福建金鑫钨业股份有限公司 | Hard alloy tool mold manufacturing method |
| CN104525952A (en) * | 2015-01-22 | 2015-04-22 | 四川科力特硬质合金股份有限公司 | Preparation method of hard alloy pressed blank adapted to general mechanical processing |
| CN105478772A (en) * | 2014-09-15 | 2016-04-13 | 安泰科技股份有限公司 | Manufacturing method of molybdenum flat target material |
| CN106222475A (en) * | 2016-08-29 | 2016-12-14 | 河源富马硬质合金股份有限公司 | A kind of preparation method of Large scale alloy |
| CN107012379A (en) * | 2017-05-11 | 2017-08-04 | 株洲力洲硬质合金有限公司 | One kind is without forming agent hard alloy production process |
| CN111318692A (en) * | 2020-04-16 | 2020-06-23 | 上海钨睿新材料科技有限公司 | Cold isostatic pressing process for efficiently producing hard alloy bars |
| CN112359260A (en) * | 2020-11-25 | 2021-02-12 | 株洲硬质合金集团有限公司 | Hard alloy anvil as well as preparation method and application thereof |
| CN113336554A (en) * | 2021-07-02 | 2021-09-03 | 阳江职业技术学院 | Water jet sand pipe raw material, water jet sand pipe preparation method and water jet sand pipe |
| CN113523278A (en) * | 2021-05-20 | 2021-10-22 | 九江金鹭硬质合金有限公司 | Sintering method of low-stress hard alloy die material |
| CN115821099A (en) * | 2022-11-28 | 2023-03-21 | 攀钢集团攀枝花钢铁研究院有限公司 | Preparation method of hard alloy |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04147939A (en) * | 1990-10-09 | 1992-05-21 | Mitsubishi Heavy Ind Ltd | Sintered hard alloy and its manufacture |
| CN1116248A (en) * | 1994-10-25 | 1996-02-07 | 冶金工业部钢铁研究总院 | Tungsten carbide base hard alloy containing rare-earth and its oxides |
| DE4437053A1 (en) * | 1994-10-18 | 1996-02-08 | Widia Gmbh | Tungsten@ carbide hard alloy with good mechanical properties |
| CN102061401A (en) * | 2010-12-10 | 2011-05-18 | 中南大学 | Method for preparing WC base hard alloy with high hardness and high toughness |
| CN102350269A (en) * | 2011-09-26 | 2012-02-15 | 株洲硬质合金集团有限公司 | Hard alloy anvil used for compounding diamond compound sheet and preparation method thereof |
-
2013
- 2013-12-16 CN CN201310685358.8A patent/CN103834823B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04147939A (en) * | 1990-10-09 | 1992-05-21 | Mitsubishi Heavy Ind Ltd | Sintered hard alloy and its manufacture |
| DE4437053A1 (en) * | 1994-10-18 | 1996-02-08 | Widia Gmbh | Tungsten@ carbide hard alloy with good mechanical properties |
| CN1116248A (en) * | 1994-10-25 | 1996-02-07 | 冶金工业部钢铁研究总院 | Tungsten carbide base hard alloy containing rare-earth and its oxides |
| CN102061401A (en) * | 2010-12-10 | 2011-05-18 | 中南大学 | Method for preparing WC base hard alloy with high hardness and high toughness |
| CN102350269A (en) * | 2011-09-26 | 2012-02-15 | 株洲硬质合金集团有限公司 | Hard alloy anvil used for compounding diamond compound sheet and preparation method thereof |
Non-Patent Citations (4)
| Title |
|---|
| 于尧明: "提高硬质合金顶锤质量问题的探讨", 《四川冶金》 * |
| 姜爱民等: "晶粒长大抑制剂在硬质合金中的应用概况", 《硬质合金》 * |
| 赵云良: "超细WC-Co硬质合金顶锤试验", 《磨料磨具与磨削》 * |
| 高新亮: "亚微米硬质合金顶锤的研制", 《超硬材料工程》 * |
Cited By (13)
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|---|---|---|---|---|
| CN104057271A (en) * | 2014-07-04 | 2014-09-24 | 福建金鑫钨业股份有限公司 | Hard alloy tool mold manufacturing method |
| CN105478772B (en) * | 2014-09-15 | 2018-12-04 | 安泰科技股份有限公司 | A kind of manufacturing method of molybdenum planar targets |
| CN105478772A (en) * | 2014-09-15 | 2016-04-13 | 安泰科技股份有限公司 | Manufacturing method of molybdenum flat target material |
| CN104525952A (en) * | 2015-01-22 | 2015-04-22 | 四川科力特硬质合金股份有限公司 | Preparation method of hard alloy pressed blank adapted to general mechanical processing |
| CN106222475A (en) * | 2016-08-29 | 2016-12-14 | 河源富马硬质合金股份有限公司 | A kind of preparation method of Large scale alloy |
| CN106222475B (en) * | 2016-08-29 | 2017-12-29 | 河源富马硬质合金股份有限公司 | A kind of preparation method of Large scale alloy |
| CN107012379A (en) * | 2017-05-11 | 2017-08-04 | 株洲力洲硬质合金有限公司 | One kind is without forming agent hard alloy production process |
| CN111318692A (en) * | 2020-04-16 | 2020-06-23 | 上海钨睿新材料科技有限公司 | Cold isostatic pressing process for efficiently producing hard alloy bars |
| CN112359260A (en) * | 2020-11-25 | 2021-02-12 | 株洲硬质合金集团有限公司 | Hard alloy anvil as well as preparation method and application thereof |
| CN113523278A (en) * | 2021-05-20 | 2021-10-22 | 九江金鹭硬质合金有限公司 | Sintering method of low-stress hard alloy die material |
| CN113523278B (en) * | 2021-05-20 | 2022-11-18 | 九江金鹭硬质合金有限公司 | Sintering method of low-stress hard alloy die material |
| CN113336554A (en) * | 2021-07-02 | 2021-09-03 | 阳江职业技术学院 | Water jet sand pipe raw material, water jet sand pipe preparation method and water jet sand pipe |
| CN115821099A (en) * | 2022-11-28 | 2023-03-21 | 攀钢集团攀枝花钢铁研究院有限公司 | Preparation method of hard alloy |
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