CN108284229B - Sintering connection method of nano hard alloy and invar alloy - Google Patents
Sintering connection method of nano hard alloy and invar alloy Download PDFInfo
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- CN108284229B CN108284229B CN201810076116.1A CN201810076116A CN108284229B CN 108284229 B CN108284229 B CN 108284229B CN 201810076116 A CN201810076116 A CN 201810076116A CN 108284229 B CN108284229 B CN 108284229B
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
- B22F7/02—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite layers
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
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- B22F3/14—Both compacting and sintering simultaneously
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- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
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Abstract
The invention discloses a sintering connection method of a nano hard alloy and an invar alloy, which comprises the steps of sequentially filling WC-20Co (wt.%) hard alloy powder and Fe-36Ni (wt.%) invar alloy powder into a forming die according to the volume ratio of 5:1, forming a blank and extruding into a wafer, then preheating and sintering at low temperature and heating at high temperature, ensuring better wettability and completeness of interface reaction in hard alloy sintering, simultaneously obtaining a sintered body with good forming, controlling the rapidness of nano tungsten carbide grains, and solving the problems of poor mechanical connection stability, large residual stress after welding growth, poor high-temperature use performance, high cost and the like.
Description
Technical Field
The invention belongs to the technical field of metal welding and connection, and particularly relates to a sintering connection method of a nano hard alloy and an invar alloy.
Background
In the prior art, the connection of nano hard alloy and invar alloy mainly comprises the following steps: 1) the hard alloy and the steel are connected together by methods such as screw thread, riveting, interference fit and the like through mechanical connection; 2) the two are adhered together by the adhesive, but the application range is small, reticular cracks are easily generated on the surface, and the external adhesive has high toxicity, is harmful to health, pollutes the environment and is sensitive to the environmental humidity; 3) the composite casting method comprises the steps of using hard alloy as an outer ring and using steel for an inner ring; 4) brazing connection; 5) and (4) pressurizing and vacuum diffusion welding.
The problems or disadvantages of the prior art are as follows: the material waste can be caused by connecting methods such as screw threads, riveting, interference fit and the like, generally, only the key parts of the workpiece need to use hard alloy, the consumed material is increased in order to manufacture the workpiece with a mechanical structure, and the processing time is long; meanwhile, the threaded connection part is subjected to stress to cause threaded wear, and the interference fit is easy to expand and crack due to the high hardness of the hard alloy, so that the connection part is unstable, the use frequency of the material is greatly reduced, the material is not suitable for small parts, and the smaller the part is, the more difficult the processing is; the composite casting has high rejection rate, unstable quality and large residual stress; the brazing connection has low use temperature, poor joint performance, low strength and large residual stress.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide a sintering connection method of a nano hard alloy and an invar alloy, which solves the problems of poor mechanical connection stability, large residual stress after welding, poor high-temperature service performance, low connection efficiency, high cost and the like.
The above object of the present invention is achieved by the following technical solutions:
a sintering connection method of nano hard alloy and invar alloy comprises the following steps:
s1 preparation of WC-20Co (wt.%) cemented carbide powder
Carrying out wet mixing and stirring on tungsten carbide and cobalt powder with the average particle size of 50-80 nm according to the mass ratio of 4:1 for 24 hours, and then evaporating to dryness to obtain WC-20Co (wt.%) nano hard alloy powder; wherein the wet mixing adopts alcohol as a solvent, and the addition amount at least immerses the mixed powder;
s2, preparing Fe-36Ni (wt.%) invar alloy powder
Carrying out dry mixing and stirring on iron powder and nickel powder with the average particle size of 50-60 nm according to the mass ratio of 16:9 for 24 hours to obtain Fe-36Ni (wt.%) invar alloy powder;
s3, preparing WC-20Co (wt.%) nano hard alloy and Fe-36Ni (wt.%) invar alloy blank
Sequentially putting the WC-20Co (wt.%) hard alloy obtained in the step S1 and the Fe-36Ni (wt.%) invar alloy obtained in the step S2 into a forming die according to the volume ratio of 5:1, forming a blank, and extruding the blank into a wafer;
s4, vacuum sintering
Preheating and sintering the wafer obtained in the step S3 at a low temperature, and then heating and sintering at a high temperature, wherein the low-temperature preheating and sintering is carried out at a heating rate of 10-15 ℃/min until the temperature is raised to 800-850 ℃; the high-temperature heating sintering is carried out at 6.69 multiplied by 10-3Heating to 1300-1350 ℃ at the vacuum degree of Pa at the heating rate of 6-8 ℃/min, and preserving heat for 8-10 h; and finally, cooling along with the furnace, and sampling to obtain the product.
Preferably, in step S3, the forming die is a stainless steel uniaxial forming die with an inner diameter of phi 20mm, and the compression is performed by a BJ-24 type powder tablet press.
Preferably, in the step S3, the blank forming includes a pressing process and an unloading process, the pressing process and the unloading process are both kept at a constant speed, the pressing pressure is 10-20 MPa, and the pressure maintaining time is 10-20 min.
Preferably, in step S3, the disc size is Φ 20mm × 3mm, and the thickness of the Fe-36Ni (wt.%) invar powder laminate is 0.5 mm.
Preferably, in the step S4, the sintering is performed by using a ZT-40-20Y vacuum hot pressing sintering furnace.
Preferably, in step S4, the low-temperature preheating sintering is performed by heating to 810-840 ℃ at a heating rate of 11-14 ℃/min; the high-temperature heating sintering is carried out at 6.69 multiplied by 10-3Heating to 1310-1340 ℃ at a heating rate of 6-8 ℃/min under the vacuum degree of Pa, and preserving heat for 8.5-9.5 h.
Preferably, in step S4, the low-temperature preheating sintering is performed by heating to 820-830 ℃ at a heating rate of 12-13 ℃/min; the high-temperature heating sintering is carried out at 6.69 multiplied by 10-3The vacuum degree of Pa is 7 DEG CHeating to 1320-1330 ℃ at a heating rate of/min, and keeping the temperature for 9 h.
It should be further explained that, in the technical scheme of the invention, the high density of the formed material can be ensured by adopting the tungsten carbide and cobalt powder with the average particle size of 50 nm-80 nm and the nanoscale powder such as iron powder and nickel powder with the average particle size of 50 nm-60 nm for vacuum sintering. In the vacuum sintering process, 1) the sintering temperature is as follows: selecting hard alloy with the temperature of 1300-1350 ℃ to ensure that the hard alloy is still in a nanometer size after sintering, and obtaining a sintered body with comprehensive mechanical properties, wherein if the sintering temperature is too high, abnormal growth of crystal grains is easily caused, and the strength property of the sintered body is reduced; the sintering temperature is low, which is not beneficial to the proceeding of the interface reaction of the hard alloy and the invar alloy. 2) Heating speed: cracks are sensitive to heating/cooling rates: when the heating speed is high, the temperature difference is generated at different parts of the sintered body due to different heat conductivity of the components and the size of the sintered body, and large stress is generated under the combined action of the temperature difference and different thermal expansion coefficients of the components to induce the generation of micro cracks; these microcracks will propagate into macrocracks at a fast cooling rate. The heating process of the vacuum sintering in the invention is divided into two stages: a low-temperature preheating stage and a high-temperature heating stage; the heating speed in the low-temperature stage is 10-15 ℃/min, fewer cracks are generated in the sintering process in the high-temperature heating stage, better wettability and completeness of interface reaction in hard alloy sintering are guaranteed, and the heating speed is reduced to 6-8 ℃/min. 3) Vacuum degree: the high-temperature heating process is kept in the vacuum furnace at 6.69 multiplied by 10-3Pa, high vacuum degree, certain inhibition to high temperature oxidation burning loss. 4) Sintering time: the heat preservation time of the sintered blank at the sintering temperature is 8-10 h, the defects of pores and the like of the formed material can be caused when the heat preservation time is too short or too long, and the nano-scale of the crystal grains can be still maintained after sintering so as to achieve good comprehensive mechanical properties.
On the basis of the common knowledge in the field, the above preferred conditions can be combined randomly to obtain the preferred embodiments of the invention; in addition, the starting materials and reagents used in the invention are, unless otherwise indicated, either commercially available or conventionally selected.
Compared with the prior art, the invention has the positive improvement effects that:
(1) compared with the problems of poor joint performance, low strength, large residual stress and the like caused by hard alloy and steel in the traditional process, the invention connects the hard alloy and the steel material by vacuum sintering the nano-scale powder, improves the density of the material while reducing the residual stress, has good toughness and stable performance, achieves higher density of the nanocrystalline hard alloy in the solid phase sintering process at lower temperature, and can completely eliminate densely distributed small holes in the liquid phase sintering process at higher temperature.
(2) In the high-temperature sintering stage, the heating rate is reduced to 6-8 ℃/min, so that fewer cracks are generated in the sintering process, and better wettability and completeness of interface reaction in hard alloy sintering are ensured.
(3) The high-temperature sintering temperature is 1300-1350 ℃, the sintered body with good forming is obtained, the rapid growth of nano tungsten carbide grains is controlled, and the problems of poor mechanical connection stability, large residual stress after welding, poor high-temperature use performance, high cost and the like are solved.
(4) Compared with the traditional process in which only one alloy powder is sintered and applied to metal connection in the traditional method, the invention adopts the vacuum sintering process and simultaneously sinters the two powders, thereby reducing the residual stress and simultaneously improving the density, and further obtaining two alloy sintered bodies which are tightly connected and well formed.
Drawings
FIG. 1 is a graph of a sintering process of the present invention;
FIG. 2 is an optical micrograph of a typical sample after sintering according to the present invention wherein (a) is a side view and (b) is a front view;
FIG. 3 is an SEM picture of a sintered interface of a sample of example 1 of the present invention.
Detailed Description
The following provides a detailed description of the preferred embodiments of the present invention with reference to the accompanying drawings.
Example 1
A sintering connection method of nano hard alloy and invar alloy comprises the following steps:
step one, carrying out wet mixing on tungsten carbide with the average particle size of 80nm and cobalt powder with the average particle size of 50nm according to the mass ratio of 4:1, stirring for 24h, evaporating to dryness, adopting alcohol as a solvent, and immersing the mixed powder in an adding amount to obtain WC-20Co (wt.%) hard alloy powder.
And step two, dry-mixing and stirring the iron powder with the average particle size of 50nm and the nickel powder with the average particle size of 50nm according to the mass ratio of 16:9 for 24 hours to obtain Fe-36Ni (wt.%) invar alloy powder.
Step three, sequentially filling the WC-20Co (wt.%) hard alloy obtained in the step S1 and the Fe-36Ni (wt.%) invar alloy obtained in the step S2 into a uniaxial forming die with an inner diameter phi of 20mm according to a volume ratio of 5:1 for blank forming, then extruding the blank into a wafer with the size phi of 20mm multiplied by 3mm by adopting a BJ-24 type powder tablet press, wherein the thickness of a pressed layer of Fe-36Ni (wt.%) invar alloy powder is 0.5 mm; the blank forming comprises a pressure applying process and an unloading process, wherein the pressure applying process and the unloading process are both kept at a constant speed, the pressure applying pressure is 10MPa, and the pressure maintaining time is 10 min.
Fourthly, preheating and sintering the wafer obtained in the S3 at a low temperature and then heating and sintering at a high temperature by adopting a ZT-40-20Y vacuum hot pressing sintering furnace, wherein the heating rate of the low-temperature preheating and sintering at 10 ℃/min is increased to 800 ℃; high-temperature sintering at 6.69 x 10-3Heating to 1300 ℃ at a heating rate of 6 ℃/min under the vacuum degree of Pa, and preserving heat for 8h, as shown in figure 1; and finally, cooling along with the furnace, and sampling to obtain the product as shown in the attached figure 2.
As shown in fig. 3, in the sintered sample, it can be observed that the invar alloy thin layer on the top layer is well formed, the invar alloy thin layer and the hard alloy substrate have good connectivity, a wider transition layer is provided, and a sintered body without interface pores is present, which further illustrates that the rapid growth of tungsten carbide grains can be well controlled by the combination of the hard alloy and the invar alloy nano powder through the vacuum sintering process.
Example 2
A sintering connection method of nano hard alloy and invar alloy comprises the following steps:
step one, carrying out wet mixing on tungsten carbide with the average particle size of 50nm and cobalt powder with the average particle size of 50nm according to the mass ratio of 4:1, stirring for 24h, evaporating to dryness, adopting alcohol as a solvent, and immersing the mixed powder in an adding amount to obtain WC-20Co (wt.%) hard alloy powder.
And step two, dry-mixing and stirring the iron powder with the average particle size of 60nm and the nickel powder with the average particle size of 60nm according to the mass ratio of 16:9 for 24 hours to obtain Fe-36Ni (wt.%) invar alloy powder.
Step three, sequentially filling the WC-20Co (wt.%) hard alloy obtained in the step S1 and the Fe-36Ni (wt.%) invar alloy obtained in the step S2 into a uniaxial forming die with an inner diameter phi of 20mm according to a volume ratio of 5:1 for blank forming, then extruding the blank into a wafer with the size phi of 20mm multiplied by 3mm by adopting a BJ-24 type powder tablet press, wherein the thickness of a pressed layer of Fe-36Ni (wt.%) invar alloy powder is 0.5 mm; the blank forming comprises a pressing process and an unloading process, wherein the pressing process and the unloading process are kept at constant speed, the pressing pressure is 10MPa, and the pressure maintaining time is 10 min.
Fourthly, the wafer obtained in the step S3 is preheated and sintered at low temperature and then heated and sintered at high temperature by adopting a ZT-40-20Y vacuum hot pressing sintering furnace, wherein the heating rate of the low-temperature preheating sintering is 10 ℃/min, the temperature is increased to 800 ℃, and the high-temperature heating sintering is 6.69 multiplied by 10-3Heating to 1300 ℃ at the vacuum degree of Pa by adopting the heating rate of 6 ℃/min, and preserving the heat for 8 hours; and finally, cooling along with the furnace, and sampling to obtain the product.
Example 3
A sintering connection method of nano hard alloy and invar alloy comprises the following steps:
step one, carrying out wet mixing on tungsten carbide with the average particle size of 60nm and cobalt powder with the average particle size of 60nm according to the mass ratio of 4:1, stirring for 24h, evaporating to dryness, and immersing the mixed powder in an adding amount of alcohol serving as a solvent to obtain WC-20Co (wt.%) hard alloy powder.
And step two, dry-mixing and stirring the iron powder with the average particle size of 55nm and the nickel powder with the average particle size of 55nm for 24 hours according to the mass ratio of 16:9 to obtain Fe-36Ni (wt.%) invar alloy powder.
Step three, sequentially filling the WC-20Co (wt.%) hard alloy obtained in the step S1 and the Fe-36Ni (wt.%) invar alloy obtained in the step S2 into a uniaxial forming die with an inner diameter phi of 20mm according to a volume ratio of 5:1 for blank forming, then extruding the blank into a wafer with the size phi of 20mm multiplied by 3mm by adopting a BJ-24 type powder tablet press, wherein the thickness of a pressed layer of Fe-36Ni (wt.%) invar alloy powder is 0.5 mm; the blank forming comprises a pressing process and an unloading process, wherein the pressing process and the unloading process are kept at constant speed, the pressing pressure is 12MPa, and the pressure maintaining time is 12 min.
Fourthly, the wafer obtained in the step S3 is preheated and sintered at low temperature and then heated and sintered at high temperature by adopting a ZT-40-20Y vacuum hot pressing sintering furnace, wherein the heating rate of 11 ℃/min is adopted for preheating and sintering at low temperature to 810 ℃, and the heating and sintering at high temperature is 6.69 multiplied by 10-3Heating to 1350 ℃ at the vacuum degree of Pa by adopting the heating rate of 7 ℃/min, and preserving heat for 9 h; and finally, cooling along with the furnace, and sampling to obtain the product.
Example 4
A sintering connection method of nano hard alloy and invar alloy comprises the following steps:
step one, mixing tungsten carbide with the average particle size of 70nm and cobalt powder with the average particle size of 70nm according to the mass ratio of 4:1, performing wet mixing and stirring for 24 hours, evaporating to dryness, and immersing the mixed powder in an adding amount by using alcohol as a solvent to obtain WC-20Co (wt.%) hard alloy powder.
And step two, dry-mixing and stirring the iron powder with the average particle size of 58nm and the nickel powder with the average particle size of 58nm according to the mass ratio of 16:9 for 24 hours to obtain Fe-36Ni (wt.%) invar alloy powder.
Step three, sequentially filling the WC-20Co (wt.%) hard alloy obtained in the step S1 and the Fe-36Ni (wt.%) invar alloy obtained in the step S2 into a uniaxial forming die with an inner diameter phi of 20mm according to a volume ratio of 5:1 for blank forming, then extruding the blank into a wafer with the size phi of 20mm multiplied by 3mm by adopting a BJ-24 type powder tablet press, wherein the thickness of a pressed layer of Fe-36Ni (wt.%) invar alloy powder is 0.5 mm; the blank forming comprises a pressing process and an unloading process, wherein the pressing process and the unloading process are kept at constant speed, the pressing pressure is 14MPa, and the pressure maintaining time is 14 min.
Step four, preheating and sintering the wafer obtained in the step S3 at low temperature in a ZT-40-20Y vacuum hot pressing sintering furnaceSintering and then high-temperature heating sintering, wherein the low-temperature preheating sintering adopts the heating rate of 12 ℃/min to be heated to 830 ℃, and the high-temperature heating sintering is 6.69 multiplied by 10-3Heating to 1320 ℃ at the vacuum degree of Pa by adopting the heating rate of 8 ℃/min, and preserving the heat for 10 hours; and finally, cooling along with the furnace, and sampling to obtain the product.
Example 5
A sintering connection method of nano hard alloy and invar alloy comprises the following steps:
step one, carrying out wet mixing on tungsten carbide with the average particle size of 80nm and cobalt powder with the average particle size of 80nm according to the mass ratio of 4:1, stirring for 24h, evaporating to dryness, adopting alcohol as a solvent, and immersing the mixed powder in an adding amount to obtain WC-20Co (wt.%) hard alloy powder.
And step two, dry-mixing and stirring the iron powder with the average particle size of 60nm and the nickel powder with the average particle size of 60nm according to the mass ratio of 16:9 for 24 hours to obtain Fe-36Ni (wt.%) invar alloy powder.
Step three, sequentially filling the WC-20Co (wt.%) hard alloy obtained in the step S1 and the Fe-36Ni (wt.%) invar alloy obtained in the step S2 into a uniaxial forming die with an inner diameter phi of 20mm according to a volume ratio of 5:1 for blank forming, then extruding the blank into a wafer with the size phi of 20mm multiplied by 3mm by adopting a BJ-24 type powder tablet press, wherein the thickness of a pressed layer of Fe-36Ni (wt.%) invar alloy powder is 0.5 mm; the blank forming comprises a pressing process and an unloading process, wherein the pressing process and the unloading process are kept at constant speed, the pressing pressure is 20MPa, and the pressure maintaining time is 20 min.
Fourthly, the wafer obtained in the step S3 is preheated and sintered at low temperature and then heated and sintered at high temperature by adopting a ZT-40-20Y vacuum hot pressing sintering furnace, wherein the heating rate of the low-temperature preheating sintering is 15 ℃/min, the temperature is increased to 850 ℃, and the heating and sintering at high temperature is 6.69 multiplied by 10-3Heating to 1350 ℃ at the vacuum degree of Pa by adopting the heating rate of 8 ℃/min, and preserving heat for 10 h; and finally, cooling along with the furnace, and sampling to obtain the product.
Example 6
A sintering connection method of nano hard alloy and invar alloy comprises the following steps:
step one, carrying out wet mixing on tungsten carbide with the average particle size of 75nm and cobalt powder with the average particle size of 75nm according to the mass ratio of 4:1, stirring for 24h, evaporating to dryness, adopting alcohol as a solvent, and immersing the mixed powder in an adding amount to obtain WC-20Co (wt.%) hard alloy powder.
And step two, dry-mixing and stirring the iron powder with the average particle size of 50nm and the nickel powder with the average particle size of 50nm according to the mass ratio of 16:9 for 24 hours to obtain Fe-36Ni (wt.%) invar alloy powder.
Step three, sequentially filling the WC-20Co (wt.%) hard alloy obtained in the step S1 and the Fe-36Ni (wt.%) invar alloy obtained in the step S2 into a uniaxial forming die with an inner diameter phi of 20mm according to a volume ratio of 5:1 for blank forming, then extruding the blank into a wafer with the size phi of 20mm multiplied by 3mm by adopting a BJ-24 type powder tablet press, wherein the thickness of a pressed layer of Fe-36Ni (wt.%) invar alloy powder is 0.5 mm; the blank forming comprises a pressing process and an unloading process, wherein the pressing process and the unloading process are kept at constant speed, the pressing pressure is 15MPa, and the pressure maintaining time is 15 min.
Fourthly, the wafer obtained in the step S3 is preheated and sintered at low temperature and then heated and sintered at high temperature by adopting a ZT-40-20Y vacuum hot pressing sintering furnace, wherein the heating rate of the low-temperature preheating sintering is 14 ℃/min, the temperature is increased to 840 ℃, and the heating and sintering at high temperature is 6.69 multiplied by 10-3Heating to 1340 ℃ at the vacuum degree of Pa by adopting the heating rate of 7 ℃/min, and preserving the temperature for 10 hours; and finally, cooling along with the furnace, and sampling to obtain the product.
Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (8)
1. A sintering connection method of nano hard alloy and invar alloy is characterized by comprising the following steps:
s1 preparation of WC-20Co (wt.%) cemented carbide powder
Carrying out wet mixing and stirring on tungsten carbide and cobalt powder with the average particle size of 50-80 nm according to the mass ratio of 4:1 for 24 hours, and then evaporating to dryness to obtain WC-20Co (wt.%) nano hard alloy powder; wherein the wet mixing adopts alcohol as a solvent, and the addition amount at least immerses the mixed powder;
s2, preparing Fe-36Ni (wt.%) invar alloy powder
Carrying out dry mixing and stirring on iron powder and nickel powder with the average particle size of 50-60 nm according to the mass ratio of 16:9 for 24 hours to obtain Fe-36Ni (wt.%) invar alloy powder;
s3, preparing WC-20Co (wt.%) nano hard alloy and Fe-36Ni (wt.%) invar alloy blank
Sequentially putting the WC-20Co (wt.%) hard alloy obtained in the step S1 and the Fe-36Ni (wt.%) invar alloy obtained in the step S2 into a forming die according to the volume ratio of 5:1, forming a blank, and extruding the blank into a wafer; wherein the wafer size is Φ 20mm x 3mm and the thickness of the Fe-36Ni (wt.%) invar powder laminate is 0.5 mm;
s4, vacuum sintering
Preheating and sintering the wafer obtained in the step S3 at a low temperature, and then heating and sintering at a high temperature, wherein the low-temperature preheating and sintering is carried out at a heating rate of 10-15 ℃/min until the temperature is raised to 800-850 ℃; the high-temperature heating sintering is carried out at 6.69 multiplied by 10-3Heating to 1300-1350 ℃ at the vacuum degree of Pa at the heating rate of 6-8 ℃/min, and preserving heat for 8-10 h; cooling with the furnace to obtain the product.
2. The method for sintering and joining nano-cemented carbide and invar alloy as claimed in claim 1, wherein in step S3, the forming die is a stainless steel uniaxial forming die with an inner diameter of 20mm, and the pressing is performed by a BJ-24 type powder press.
3. The method for sintering and joining nano-cemented carbide and invar alloy according to claim 1, wherein in step S3, the blank forming comprises pressing and unloading processes, the pressing and unloading processes are both kept at a constant speed, the pressing pressure is 10-20 MPa, and the pressure holding time is 10-20 min.
4. The method for sintering and bonding nano-cemented carbide and invar alloy as claimed in claim 1, wherein in step S4, the sintering is performed in a ZT-40-20Y vacuum hot pressing sintering furnace.
5. The method for sintering and bonding the nano-cemented carbide and the invar alloy according to claim 1, wherein in the step S4, the low-temperature preheating sintering is performed by heating to 810-840 ℃ at a heating rate of 11-14 ℃/min.
6. The method for sintering and joining nano-cemented carbide and invar alloy as claimed in claim 1 or 5, wherein in step S4, the low temperature pre-heating sintering is performed by heating to 820-830 ℃ at a heating rate of 12-13 ℃/min.
7. The method for sintering and joining nano-cemented carbide and invar alloy as claimed in claim 1, wherein the high temperature sintering is performed at 6.69 x 10 in step S4-3Heating to 1310-1340 ℃ at a heating rate of 6-8 ℃/min under the vacuum degree of Pa, and preserving heat for 8.5-9.5 h.
8. The method for sintering and joining nano cemented carbide and invar alloy as claimed in claim 1 or 7, wherein the high temperature sintering is performed at 6.69 x 10 in step S4-3And (3) heating to 1320-1330 ℃ at a heating rate of 7 ℃/min under the vacuum degree of Pa, and preserving heat for 9 h.
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