CN114289721A - Sandwich alloy bar and manufacturing method thereof - Google Patents
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- CN114289721A CN114289721A CN202210009623.XA CN202210009623A CN114289721A CN 114289721 A CN114289721 A CN 114289721A CN 202210009623 A CN202210009623 A CN 202210009623A CN 114289721 A CN114289721 A CN 114289721A
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- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 120
- 239000000956 alloy Substances 0.000 title claims abstract description 120
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 18
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- 239000007787 solid Substances 0.000 claims description 55
- 239000000843 powder Substances 0.000 claims description 32
- 238000005245 sintering Methods 0.000 claims description 26
- 239000011265 semifinished product Substances 0.000 claims description 20
- ZGDWHDKHJKZZIQ-UHFFFAOYSA-N cobalt nickel Chemical compound [Co].[Ni].[Ni].[Ni] ZGDWHDKHJKZZIQ-UHFFFAOYSA-N 0.000 claims description 15
- 239000003112 inhibitor Substances 0.000 claims description 15
- 238000000227 grinding Methods 0.000 claims description 11
- 239000011230 binding agent Substances 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 10
- 238000000465 moulding Methods 0.000 claims description 8
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- 230000000295 complement effect Effects 0.000 abstract description 9
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- 229910017052 cobalt Inorganic materials 0.000 description 7
- 239000010941 cobalt Substances 0.000 description 7
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 7
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 7
- 239000010410 layer Substances 0.000 description 5
- 239000000047 product Substances 0.000 description 5
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- 239000013078 crystal Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
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- UPAWIKUZXZKSOH-OPSIUPSMSA-N 2-(dimethylamino)ethyl 4-(butylamino)benzoate;4-[(1r)-1-hydroxy-2-(methylamino)ethyl]benzene-1,2-diol;methyl (1s,3s,4r,5r)-3-benzoyloxy-8-methyl-8-azabicyclo[3.2.1]octane-4-carboxylate Chemical compound CNC[C@H](O)C1=CC=C(O)C(O)=C1.CCCCNC1=CC=C(C(=O)OCCN(C)C)C=C1.O([C@H]1C[C@@H]2CC[C@@H](N2C)[C@H]1C(=O)OC)C(=O)C1=CC=CC=C1 UPAWIKUZXZKSOH-OPSIUPSMSA-N 0.000 description 1
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- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention provides a sandwich alloy bar and a manufacturing method thereof, wherein the sandwich alloy bar comprises a core rod and an external hollow rod, the external hollow rod is provided with a hollow hole, the hollow hole and the external hollow rod are coaxial, the diameter of the hollow hole is matched with that of the core rod, and the core rod penetrates through the hollow hole and is filled in the hollow hole; the core rod is made of high-carbon alloy, the outer hollow rod is made of low-carbon alloy, and the diameter of the core rod accounts for 1/3-2/3 of the diameter of the alloy rod. The invention adopts two hard alloys with different components to respectively form, then combines the two parts of alloys into an alloy whole, can form two different structural regions with complementary performance in the bar, can also design alloys with different sandwich proportions according to the requirements, and is beneficial to meeting the use requirements of the sandwich alloy bar and expanding the application range of the sandwich alloy bar.
Description
Technical Field
The invention relates to the technical field of molding and sintering, in particular to a sandwich alloy bar and a manufacturing method thereof.
Background
Cemented carbide consists of a hard but brittle WC (tungsten carbide) phase and a tough binder phase Co/Ni. The finer the WC grain size is, the higher the hardness of the material is, and the better the wear resistance is; the higher the Co/Ni content, the better the toughness, but the corresponding wear resistance decreases. However, the cemented carbide products produced by the conventional process have an overall uniform microstructure, and even if the cemented carbide is mixed crystal cemented carbide, the structures inside and outside the alloy are relatively uniform.
Cemented carbide bodies having at least two distinct microstructural zones are well known in the art. For example, EP0951576a1 discloses a drill bit having a core of tough cemented carbide quality and a cover layer of more wear resistant quality. However, the alloy with different structures inside and outside has thin surface layer feet, and for bar products needing to be processed into cutters, the thin surface layer can be ground off, and finally, the cutting edges and the core part are made of uniform materials.
An alternative is disclosed in the patent publication US4843039A, which discloses a cemented carbide body that is preferred for inserts of cutting tools for metal machining. These bodies comprise a cemented carbide core comprising a cemented carbide core with an eta-phase surrounded by a cemented carbide zone without an eta-phase and having a low cobalt content in the surface and a high cobalt content near the eta-phase zone. The process inhibits cobalt phase migration by forming a carbon potential difference inside and outside the hard alloy, so that the hard alloy with inconsistent internal and external cobalt contents is prepared. However, the method has very strict control on carbon potential, and a slight fluctuation may cause a serious eta phase in the alloy to influence the alloy strength, so that the phenomenon of cutter breakage occurs during cutting and machining.
Patent publication No. CN1636653A discloses a cemented carbide insert having a surface area with a low binder phase content and a fine WC grain size and thus a high wear resistance and a method for manufacturing the same. The method is to add a layer of Cr on the surface of a formed pressed blank3C2And then pressure sintering is carried out, the grain size of the alloy on the surface is further refined under the action of the inhibitor, and meanwhile, the migration of cobalt to the inside is promoted, so that a high-hardness alloy structure with finer grain size on the surface and lower cobalt content is formed, and an alloy structure with coarser grain size on the inside, higher cobalt content and better toughness is formed. However, in the alloy with different structures of the inner alloy and the outer alloy generated by the inhibitor mode, the alloy of the outer layer is difficult to exceed 3 mm.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a sandwich alloy bar and a manufacturing method thereof, two different structural regions with complementary properties can be formed in the bar through two hard alloys with different components formed separately, and alloys with different sandwich proportions can be designed according to requirements, so that the use requirements of the sandwich alloy bar can be met, and the application range of the sandwich alloy bar can be expanded.
The invention is realized by the following technical scheme:
according to one aspect of the invention, there is provided a sandwich alloy bar comprising a mandrel and an outer hollow bar having a hollow bore coaxial with the outer hollow bar, the diameter of the hollow bore being adapted to the mandrel, the mandrel penetrating and filling the hollow bore; the core rod is made of high-carbon alloy, the outer hollow rod is made of low-carbon alloy, and the diameter of the core rod accounts for 1/3-2/3 of the diameter of the alloy rod.
Preferably, the grain size of the WC in the core rod and the outer hollow rod is different by 0.2-1.0 um; the grain size of WC in the core rod is 0.8-2.0um, and the grain size of WC in the external hollow rod is 0.2-0.8 um.
Preferably, the core rod and the outer hollow rod both comprise a cobalt-nickel binder phase, the content of the cobalt-nickel binder phase in the core rod being 1-5% higher than the content in the outer hollow rod.
Preferably, the relative magnetic saturation of the core rod is 5-10% higher than the relative magnetic saturation of the outer hollow rod.
Preferably, the mandrel does not contain an inhibitor, the outer hollow rod contains an inhibitor, and the inhibitor is Cr2C3At least one of VC and TaC.
According to another aspect of the present invention, there is provided a method for manufacturing the above-mentioned sandwich alloy bar, including:
extruding and molding high-carbon alloy component powder for forming the core rod and sintering to obtain a solid round rod, wherein the diameter of the solid round rod accounts for 1/3-2/3 of the diameter of the alloy rod;
extruding and forming low-carbon alloy component powder for forming an external hollow rod to obtain a hollow rod semi-finished product green blank, wherein the hollow rod semi-finished product green blank is provided with a hollow hole;
will solid round bar is put into the semi-manufactured goods unburned bricks of hollow bar in the cavity hole, through the low pressure furnace sintering, solid round bar with the semi-manufactured goods unburned bricks of hollow bar combine into an alloy whole, obtain sandwich alloy rod.
Preferably, the grain size of WC differs between 0.2-1.0um in the high carbon alloy component powder and the low carbon alloy component powder, the grain size of WC in the high carbon alloy component powder is 0.8-2.0um, the grain size of WC in the low carbon alloy component powder is 0.2-0.8 um; the content of the cobalt-nickel binding phase in the high-carbon alloy component powder is 1-5% higher than that in the low-carbon alloy component powder.
Preferably, before the placing the solid round bar into the hollow hole of the hollow bar semi-finished green body, the method further comprises: and carrying out coarse grinding treatment on the surface of the solid round bar to remove surface impurities of the solid round bar and enable the solid round bar to be better attached to the hollow hole of the hollow bar semi-finished product green body.
Preferably, the outer diameter of the solid round bar after the rough grinding treatment is 0.05mm larger than the diameter of the hollow hole of the hollow bar semi-finished green product.
Preferably, the conditions for low-pressure furnace sintering are as follows: the sintering temperature is 1400 ℃ and 1450 ℃, the pressure is 5-9Mpa, and the pressure maintaining time is 15-60 minutes.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the sandwich alloy bar and the manufacturing method thereof, two hard alloys with different components are respectively molded, and then the two parts of alloys are combined into an alloy whole, so that two different structural areas with complementary performance can be formed, alloy bars with different sandwich proportions can be designed according to requirements, and the use requirements of the sandwich alloy bar can be met, and the application range of the sandwich alloy bar can be expanded.
2. According to the sandwich alloy bar and the manufacturing method thereof, two different structural regions with complementary performance are formed by separately molded hard alloys with two different components, the difference between the WC grain size and the Co/Ni binding phase content between an inner core rod and an outer hollow rod in the alloy bar is 0.2-1.0um, and the difference between the Co/Ni binding phase content is 1.5% -5%.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a schematic view of the scanning electron microscope results of a core rod and an outer hollow rod of a sandwich alloy bar in an embodiment of the present invention; wherein a is a core rod and b is an outer hollow rod.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.
The embodiment of the invention provides a sandwich alloy bar which can be used for a hard alloy cutting tool, and the sandwich alloy bar comprises a core rod and an external hollow rod, wherein the external hollow rod is provided with a hollow hole, the hollow hole and the external hollow rod are coaxial, the diameter of the hollow hole is matched with that of the core rod, and the core rod penetrates through and is filled in the hollow hole; the core rod is made of high-carbon alloy, the outer hollow rod is made of low-carbon alloy, and the diameter of the core rod accounts for 1/3-2/3 of the diameter of the alloy rod according to the requirement of the sharpening depth of the regular hard cutter. In other embodiments, according to the requirement of the sharpening depth of the finish-hardening cutter, in combination with practical situations, the diameter of the core rod can be adjusted at will, so that alloy bars with different sandwich proportions can be designed, the use requirement of the sandwich alloy bars can be met, and the application range of the sandwich alloy bars can be expanded.
WC is used as the main raw material of the hard alloy, and in some preferred embodiments, the grain size of the WC in the core rod and the outer hollow rod is different by 0.2-1.0 um; the grain size of WC in the core rod is 0.8-2.0um, the grain size of WC in the external hollow rod is 0.2-0.8um, and the grain size difference between the core rod and the WC in the external hollow rod can be seen from figure 1. The core rod and the external hollow rod both comprise cobalt-nickel binding phases, the content of the cobalt-nickel binding phases in the core rod is 1-5% higher than that in the external hollow rod, coarse crystals in the core rod enable the core rod to have better impact resistance, and a cobalt-nickel (Co/Ni) binding phase layer is thick and has good toughness; the ultra-fine grains in the outer hollow rod make it have higher hardness and good wear resistance. The content of cobalt-nickel binder phase in the core rod is higher than that in the outer hollow rod, forming a structure with hard outer and soft inner, thus forming two different structural regions with complementary properties. Compared with the prior art, the sandwich alloy bar has larger difference gradient between two structural regions, so that the use performance and strength of the product can be better coordinated.
In the embodiment, the relative magnetic saturation of the core rod is higher than that of the outer hollow rod, in some preferred embodiments, the relative magnetic saturation of the core rod is 5% -10% higher than that of the outer hollow rod, and the middle core rod adopts high-carbon alloy to effectively control Co not to migrate to the outer surface; the outer hollow rod of the outer layer of the core rod is made of low-carbon alloy, the hardness of the outer hollow rod is higher, and therefore a structure with hard outside and soft inside is formed.
In some embodiments, the core rod does not contain an inhibitor, the outer hollow rod contains an inhibitor, and the inhibitor is Cr2C3At least one of VC and TaC to inhibit the growth of crystal grains, so that the external hollow rod has higher hardness and better wear resistance.
The sandwich alloy bar in the embodiment of the invention comprises two different structural regions with complementary performance, and compared with the prior art, the two structural regions in the alloy bar have larger difference gradient, the difference between the WC grain size and the cobalt-nickel binding phase content between the inner core rod and the outer hollow rod in the alloy bar is 0.2-1.0um, and the difference between the cobalt-nickel binding phase content is 1.5-5%, because the toughness and the wear resistance are the same relationship, the toughness of the core part of the alloy bar, which does not participate in the processing part, needs to be improved as much as possible, and the wear resistance of the outer part, which participates in the processing part, is improved, so that the product use performance and strength can be better coordinated through the difference between the WC grain size and the cobalt-nickel binding phase content. In addition, alloys with different sandwich proportions can be designed according to requirements, so that the use requirements of the sandwich alloy bar can be met, and the application range of the sandwich alloy bar can be expanded.
The embodiment of the invention also provides a manufacturing method of the sandwich alloy bar, which comprises the following steps:
extruding and molding high-carbon alloy component powder for forming the core rod and sintering to obtain a solid round rod, wherein the diameter of the solid round rod accounts for 1/3-2/3 of the diameter of the alloy rod;
extruding and forming low-carbon alloy component powder for forming an external hollow rod to obtain a hollow rod semi-finished product green blank, wherein the hollow rod semi-finished product green blank is provided with a hollow hole;
and (3) putting the solid round bar into the hollow hole of the hollow bar semi-finished product green body, sintering the solid round bar and the hollow bar semi-finished product green body through a low-pressure furnace, and combining the solid round bar and the hollow bar semi-finished product green body into an alloy whole to obtain the sandwich alloy bar.
According to the embodiment of the invention, the solid round bar and the external hollow bar of the core part are separately produced, so that after the sizes of the alloy bar and the solid round bar are determined according to actual conditions and specific requirements, the alloy bar with the target size can be produced through size control during production, alloy bars with different sandwich proportions can be designed according to requirements, and the use requirements of the sandwich alloy bar can be met, and the application range of the sandwich alloy bar can be expanded.
To improve the properties of the sandwich alloy bar, in some preferred embodiments, the grain size of WC differs between 0.2-1.0um in the high carbon alloy component powder and the low carbon alloy component powder, the grain size of WC in the high carbon alloy component powder is 0.8-2.0um, and the grain size of WC in the low carbon alloy component powder is 0.2-0.8 um; the content of the cobalt-nickel binding phase in the high-carbon alloy component powder is 1% -5% higher than that in the low-carbon alloy component powder, and a structure with hard outside and soft inside is formed, so that two different structural regions with complementary properties are formed.
In order to remove the surface impurities of the solid round bar and make the solid round bar better fit with the hollow hole of the hollow bar semi-finished product, in some embodiments, before the solid round bar is placed into the hollow hole of the hollow bar semi-finished product, the method further comprises the following steps: and carrying out coarse grinding treatment on the surface of the solid round bar.
In order to ensure that the solid round bar and the semi-finished hollow bar are in interference fit when the alloy is sintered, in some preferred embodiments, the outer diameter of the solid round bar after the rough grinding treatment is 0.05mm larger than the diameter of the hollow hole of the semi-finished hollow bar.
To enhance the bonding of the core rod to the outer hollow rod, in some preferred embodiments, the conditions for low pressure furnace sintering are: the sintering temperature is 1400 ℃ and 1450 ℃, the pressure is 5-9Mpa, and the pressure maintaining time is 15-60 minutes.
According to the manufacturing method of the sandwich alloy bar in the embodiment of the method, two hard alloys with different components are respectively molded, and then the two parts of alloys are combined into an alloy whole, so that two different structural areas with complementary performance can be formed, alloys with different sandwich proportions can be designed according to requirements, the use requirements of the sandwich alloy bar can be met, and the application range of the sandwich alloy bar can be expanded; in addition, in the embodiment of the invention, two different structural regions with complementary performance are arranged between the inner core rod and the outer hollow rod in the alloy bar, the difference between the WC grain size and the Co/Ni binder phase content is 0.2-1.0um, and the difference between the Co/Ni binder phase content is 1.5% -5%. The method for producing a sandwich alloy bar of the present invention will be described in more detail below with reference to examples.
Example 1
Extruding and molding 90% WC + 10% Co component powder and sintering to obtain a D6.1 x 330mm solid round bar, wherein the grain size of WC is 0.8um, and the relative magnetic saturation of the solid round bar is controlled to be 90-95%; coarsely grinding D6.1 × 330mm solid round bars into D6.05 × 330mm solid round bars;
using 91.2% WC + 8% Co + 0.8% Cr3C2Forming component powder of the + VC + TaC combined inhibitor by extrusion to obtain a semi-finished blank of a hollow bar with the diameter of D12.3 x D6.0 x 330mm, wherein the semi-finished blank of the single-hole hard alloy is a semi-finished blank of the single-hole hard alloy, and the grain size of WC is 0.4 um;
and (3) plugging the solid round rod with the diameter of D6.05 x 330mm subjected to coarse grinding into a hollow hole of the hollow rod semi-finished product green body, and performing pressure sintering in a low-pressure furnace to 1430 ℃ and maintaining the pressure at 5Mpa for 30 minutes. The alloy interface structure of the bar obtained after sintering is positioned at the outer diameter position of the core 1/2, the grain size of WC in the core rod of the bar is 0.8um, the Co content is 10%, the alloy hardness is HRA91.5, the grain size of WC in the outer hollow bar of the bar is 0.4um, the Co content is 8%, the alloy hardness is HRA93.8, and therefore the hard alloy solid bar with the model number of D12.3 x 330mm is prepared.
Example 2
Extruding and molding 90% WC + 10% Co component powder and sintering to obtain a D6.1 x 330mm solid round bar, wherein the grain size of WC is 1.5um, and the relative magnetic saturation of the solid round bar is controlled to be 90-95%; roughly grinding the D6.1X 330mm solid round bar into D6.05X 330mm solid round bar;
using 93.5% WC + 6% Co + 0.5% Cr3C2(iii) extrusion of component powders of the + VC + TaC combination inhibitor to obtain D12.3 × D6.0 x 330mm hollow bar semi-finished product green body, which is a single straight hole hard alloy semi-finished product green body, wherein the grain size of WC is 0.8 um;
and (3) plugging the coarsely ground D6.05 x 330mm solid round bar into a hollow hole of the hollow bar semi-finished product green body, and performing pressure sintering in a low-pressure furnace to 1450 ℃ under the pressure of 5Mpa for 30 minutes. The alloy interface structure of the bar obtained after sintering is positioned at the outer diameter position of the core 1/2, the grain size of WC in the core rod of the bar is 1.5um, the Co content is 10%, the alloy hardness is HRA90.7, the grain size of the outer hollow bar of the bar is 0.8um, the Co content is 6%, the alloy hardness is HRA92.5, and therefore the hard alloy solid bar with the model D12.3 x 330mm is prepared.
Example 3
Extruding and molding 90% WC + 12% Co component powder and sintering to obtain a D8.1 x 330mm solid round bar, wherein the grain size of WC is 1.5um, and the relative magnetic saturation of the solid round bar is controlled to be 90-95%; roughly grinding the D4.1X 330mm solid round bar into D4.05X 330mm solid round bar;
using 92.5% WC + 7% Co + 0.5% Cr3C2Forming component powder of the + VC + TaC combined inhibitor by extrusion to obtain a semi-finished blank of a hollow bar with the diameter of D12.3 x D4.0 x 330mm, wherein the semi-finished blank of the single-straight-hole hard alloy is a semi-finished blank of the single-straight-hole hard alloy, and the grain size of WC is 0.5 um;
and (3) plugging the coarsely ground D8.05 x 330mm solid round bar into a hollow hole of the hollow bar semi-finished product green body, and performing pressure sintering in a low-pressure furnace to 1430 ℃ and maintaining the pressure at 5Mpa for 60 minutes. The alloy interface structure of the bar obtained after sintering is positioned at the outer diameter position of the core 1/3, the grain size of WC in the core rod of the bar is 1.5um, the Co content is 12%, the alloy hardness is HRA88.5, the grain size of the outer hollow bar of the bar is 0.5um, the Co content is 7%, the alloy hardness is HRA93.0, and thus the hard alloy solid bar with the model D12.3 x 330mm is prepared.
Example 4
Extruding and molding 90% WC + 10% Co component powder and sintering to obtain a D8.1 x 330mm solid round bar, wherein the grain size of WC is 0.8um, and the relative magnetic saturation of the solid round bar is controlled to be 90-95%; roughly grinding the D8.1X 330mm solid round bar into D8.05X 330mm solid round bar;
using 90.2% WC + 9% Co + 0.8% Cr3C2Forming component powder of the + VC + TaC combined inhibitor by extrusion to obtain a semi-finished blank of a hollow bar with the diameter of D12.3 x D8.0 x 330mm, wherein the semi-finished blank of the single-straight-hole hard alloy is a semi-finished blank of the single-straight-hole hard alloy, and the grain size of WC is 0.3 um;
and (3) plugging the coarsely ground D8.05 × 330mm solid round bar into a hollow hole of the hollow bar semi-finished product green body, and performing pressure sintering in a low-pressure furnace to 1410 ℃ under the pressure of 9Mpa for 15 minutes. The alloy interface structure of the bar obtained after sintering is positioned at the outer diameter position of the core 2/3, the grain size of WC in the core rod of the bar is 0.8um, the Co content is 10%, the alloy hardness is HRA91.7, the grain size of the outer hollow bar of the bar is 0.3um, the Co content is 9%, the alloy hardness is HRA93.8, and therefore the hard alloy solid bar with the model D12.3 x 330mm is prepared.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes and modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The above-described preferred features may be used in any combination without conflict with each other.
Claims (10)
1. A sandwich alloy bar is characterized by comprising a core rod and an external hollow rod, wherein the external hollow rod is provided with a hollow hole, the hollow hole and the external hollow rod are coaxial, the diameter of the hollow hole is matched with that of the core rod, and the core rod penetrates through and is filled in the hollow hole;
the core rod is made of high-carbon alloy, the outer hollow rod is made of low-carbon alloy, and the diameter of the core rod accounts for 1/3-2/3 of the diameter of the alloy rod.
2. The sandwich alloy bar of claim 1, wherein the grain size of the WC of the mandrel and the outer hollow bar differ by 0.2-1.0 um; the grain size of WC in the core rod is 0.8-2.0um, and the grain size of WC in the external hollow rod is 0.2-0.8 um.
3. The sandwich alloy bar of claim 1, wherein the core rod and the outer hollow rod each comprise a cobalt nickel binder phase, the cobalt nickel binder phase being present in the core rod in an amount of 1% to 5% greater than the content of the cobalt nickel binder phase in the outer hollow rod.
4. The sandwich alloy bar of claim 1, wherein the relative magnetic saturation of the core rod is 5% -10% higher than the relative magnetic saturation of the outer hollow bar.
5. The sandwich alloy bar of claim 1, wherein the core rod does not contain an inhibitor, the outer hollow bar contains an inhibitor, and the inhibitor is Cr2C3At least one of VC and TaC.
6. A method of manufacturing the sandwich alloy bar of any one of claims 1-5, comprising:
extruding and molding high-carbon alloy component powder for forming the core rod and sintering to obtain a solid round rod, wherein the diameter of the solid round rod accounts for 1/3-2/3 of the diameter of the alloy rod;
extruding and forming low-carbon alloy component powder for forming an external hollow rod to obtain a hollow rod semi-finished product green blank, wherein the hollow rod semi-finished product green blank is provided with a hollow hole;
will solid round bar is put into the semi-manufactured goods unburned bricks of hollow bar in the cavity hole, through the low pressure furnace sintering, solid round bar with the semi-manufactured goods unburned bricks of hollow bar combine into an alloy whole, obtain sandwich alloy rod.
7. The method of manufacturing a sandwich alloy bar according to claim 6, wherein the grain size of WC is different between 0.2-1.0um in the high carbon alloy component powder and the low carbon alloy component powder, the grain size of WC in the high carbon alloy component powder is 0.8-2.0um, and the grain size of WC in the low carbon alloy component powder is 0.2-0.8 um; the content of the cobalt-nickel binding phase in the high-carbon alloy component powder is 1-5% higher than that in the low-carbon alloy component powder.
8. The method of manufacturing a sandwich alloy bar according to claim 6, further comprising, before said placing said solid round bar into said hollow hole of said green hollow bar semi-finished product: and carrying out coarse grinding treatment on the surface of the solid round bar to remove surface impurities of the solid round bar and enable the solid round bar to be better attached to the hollow hole of the hollow bar semi-finished product green body.
9. The method of manufacturing a sandwich alloy bar according to claim 8, wherein the outer diameter of the solid round bar after the rough grinding process is 0.05mm larger than the diameter of the hollow hole of the semi-finished hollow bar blank.
10. The method of manufacturing a sandwich alloy bar according to claim 6, wherein the conditions of the low pressure furnace sintering are: the sintering temperature is 1400 ℃ and 1450 ℃, the pressure is 5-9Mpa, and the pressure maintaining time is 15-60 minutes.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US4618540A (en) * | 1983-05-13 | 1986-10-21 | Santrade Limited | Compound body and method of making the same |
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