CN113637862A - Sintering method of WC-Co hard alloy - Google Patents

Sintering method of WC-Co hard alloy Download PDF

Info

Publication number
CN113637862A
CN113637862A CN202110949416.8A CN202110949416A CN113637862A CN 113637862 A CN113637862 A CN 113637862A CN 202110949416 A CN202110949416 A CN 202110949416A CN 113637862 A CN113637862 A CN 113637862A
Authority
CN
China
Prior art keywords
sintering
furnace
temperature
temperature rise
end point
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN202110949416.8A
Other languages
Chinese (zh)
Other versions
CN113637862B (en
Inventor
弓满锋
李萌
张程煜
莫德云
湛广平
胡惠璇
林文静
宋卓林
刘广发
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Northwestern Polytechnical University
Lingnan Normal University
Original Assignee
Northwestern Polytechnical University
Lingnan Normal University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Northwestern Polytechnical University, Lingnan Normal University filed Critical Northwestern Polytechnical University
Priority to CN202110949416.8A priority Critical patent/CN113637862B/en
Publication of CN113637862A publication Critical patent/CN113637862A/en
Application granted granted Critical
Publication of CN113637862B publication Critical patent/CN113637862B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/04—Making non-ferrous alloys by powder metallurgy
    • C22C1/05—Mixtures of metal powder with non-metallic powder
    • C22C1/051—Making hard metals based on borides, carbides, nitrides, oxides or silicides; Preparation of the powder mixture used as the starting material therefor
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
    • C22C29/02—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides
    • C22C29/06—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds
    • C22C29/067—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds comprising a particular metallic binder
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
    • C22C29/02—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides
    • C22C29/06—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds
    • C22C29/08—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds based on tungsten carbide

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Powder Metallurgy (AREA)

Abstract

The invention discloses a sintering method of WC-Co hard alloy, belonging to the technical field of powder metallurgy. The method comprises the steps of heating and sintering in a stepped mode, opening an electromagnetic valve with pulse intermittent partial pressure and filling protective gas into a furnace to adjust the vacuum degree in the furnace before the temperature rises to the liquid phase temperature of the Co phase, stopping heating after the heat preservation is finished, closing the electromagnetic valve with pulse intermittent partial pressure and finishing partial pressure when the temperature of the furnace is cooled to a certain temperature, and cooling to the room temperature along with the furnace to finish the sintering of the WC-Co hard alloy. The invention controls the flow of the protective gas through the pulse controller, thereby controlling the vacuum degree in the furnace and effectively avoiding the phenomena of large volatilization of Co and carburization of alloy materials. The WC-Co hard alloy with higher compactness is finally prepared, and the toughness and the strength of the WC-Co hard alloy are obviously improved compared with the alloy prepared by the traditional WC-Co hard alloy sintering method.

Description

Sintering method of WC-Co hard alloy
Technical Field
The invention relates to the technical field of powder metallurgy, in particular to a sintering method of WC-Co hard alloy.
Background
WC cemented carbide has many excellent properties such as high strength, high hardness, and high toughness, and thus is widely used in the fields of cutting, drilling, mining, tool forming, and wear-resistant parts. In order to solve the problems of low sintering property and hard brittleness of the WC alloy, binders such as Fe, Co, Ni and the like are usually added among the carbon tungsten particles, so that the compactness and the toughness of the WC hard alloy are improved.
Of the three common binders, Co has good wettability, yield and work hardening behavior, making it the most widely used metal binder in WC cemented carbides. However, the WC-Co cemented carbide is mostly prepared by a high temperature liquid phase sintering method, and Co is easily volatilized in the high temperature sintering process, so that Co usually loses a part in the sintering process, thereby causing the reduction of the compactness and the toughness of the alloy, and affecting the performance of the alloy.
Disclosure of Invention
In order to solve the problem that the alloy performance is damaged due to Co loss in the high-temperature liquid phase sintering process of the existing WC-Co hard alloy sintering method, the invention provides the WC-Co hard alloy sintering method, which can adjust the vacuum degree in a furnace by controlling the inflow of protective gas and avoid the problem that the alloy performance is influenced by the easy loss of a binding phase Co in the conventional high-temperature liquid phase sintering method.
In order to achieve the purpose, the invention adopts the following technical scheme:
and (3) adopting step-type heating sintering, opening the electromagnetic valve with pulse intermittent partial pressure and filling protective gas into the furnace to adjust the vacuum degree in the furnace before the temperature is increased to the liquid phase temperature of the Co phase, stopping heating after the heat preservation is finished, closing the electromagnetic valve with pulse intermittent partial pressure and finishing partial pressure when the furnace temperature is cooled to 1090-1110 ℃, and cooling to the room temperature along with the furnace to finish the sintering of the WC-Co hard alloy.
Further, the alloy types applied in the sintering method of WC-Co hard alloy provided by the invention include but are not limited to the following: YG, YT, YA or YW alloys.
Further, the step-type heating sintering is divided into a first sintering stage, a second sintering stage, a third sintering stage, a fourth sintering stage and a fifth sintering stage.
Further, the temperature rise time of the first sintering stage is 20-40 min, the temperature rise end point is 190-210 ℃, and the heat preservation time after the temperature rise end point is reached is 30-60 min.
Further, the temperature rise time of the second sintering stage is 30-40 min, the temperature rise end point is 390-410 ℃, and the heat preservation time after the temperature rise end point is reached is 50-70 min.
Furthermore, the temperature rise time of the third sintering stage is 60-90 min, the temperature rise end point is 690-710 ℃, and the heat preservation time after the temperature rise end point is reached is 50-70 min.
Furthermore, the temperature rise time of the fourth sintering stage is 60-90 min, the temperature rise end point is 1190-1210 ℃, and the heat preservation time after the temperature rise end point is reached is 55-70 min.
Further, the temperature rise time of the fifth sintering stage is 45-85 min, the temperature rise end point is 1350-1450 ℃, and the heat preservation time after the temperature rise end point is reached is 45-85 min.
Further, before the furnace temperature of the fifth sintering stage is increased to the liquid phase temperature of the Co phase, the electromagnetic valve of pulse intermittent partial pressure is opened and protective gas is filled into the furnace to adjust the vacuum degree in the furnace.
Further, the liquid-phase temperature of the Co phase is 1280-1350 ℃.
Further, when the temperature in the furnace rises to 1220-1270 ℃, an electromagnetic valve with pulse intermittent partial pressure is opened, and protective gas is filled into the furnace.
Furthermore, the pulse pause time is 10-60 s, the partial pressure time is 0.5-3 s, and the pressure in the furnace is 10-300 Pa.
Further, the protective gas is nitrogen or argon.
The invention has the following beneficial effects:
1. the invention adopts a simple and effective method to adjust the vacuum degree in the furnace by controlling the flow of the protective gas through the pulse, thereby avoiding the problem that the binder phase Co in the WC-Co hard alloy is easy to volatilize in the conventional high-temperature liquid phase sintering process.
2. The WC-Co hard alloy sintering method provided by the invention can also avoid the carburization phenomenon of the WC-Co hard alloy under the condition of sintering at a low vacuum degree, so that the adverse effects on the strength, toughness, wear resistance and other properties of the alloy caused by the condition that the continuity of the alloy matrix is damaged by free graphite are avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a fracture SEM image of a WC-Co hard alloy obtained by sintering in example 4 of the invention;
FIG. 2 is a fracture SEM image of a WC-Co hard alloy sintered according to comparative example 2 of the invention;
FIG. 3 is a graph showing the EDS elemental analysis results of a WC-Co cemented carbide sintered in comparative example 2 according to the present invention.
Detailed Description
The invention provides a sintering method of WC-Co hard alloy, which specifically comprises the following steps:
and (3) adopting step-type heating sintering, opening the electromagnetic valve with pulse intermittent partial pressure and filling protective gas into the furnace to adjust the vacuum degree in the furnace before the temperature is increased to the liquid phase temperature of the Co phase, stopping heating after the heat preservation is finished, closing the electromagnetic valve with pulse intermittent partial pressure and finishing partial pressure when the furnace temperature is cooled to 1090-1110 ℃, and cooling to the room temperature along with the furnace to finish the sintering of the WC-Co hard alloy.
Further, the alloy types applied in the sintering method of WC-Co hard alloy provided by the invention include but are not limited to the following: YG, YT, YA or YW alloys.
Further, the step-type heating sintering is divided into a first sintering stage, a second sintering stage, a third sintering stage, a fourth sintering stage and a fifth sintering stage.
Further, the temperature rise time of the first sintering stage is 20-40 min, the temperature rise end point is 190-210 ℃, and the heat preservation time after the temperature rise end point is reached is 30-60 min.
Further, the temperature rise time of the second sintering stage is 30-40 min, the temperature rise end point is 390-410 ℃, and the heat preservation time after the temperature rise end point is reached is 50-70 min.
Furthermore, the temperature rise time of the third sintering stage is 60-90 min, the temperature rise end point is 690-710 ℃, and the heat preservation time after the temperature rise end point is reached is 50-70 min.
Furthermore, the temperature rise time of the fourth sintering stage is 60-90 min, the temperature rise end point is 1190-1210 ℃, and the heat preservation time after the temperature rise end point is reached is 55-70 min.
Further, the temperature rise time of the fifth sintering stage is 45-85 min, the temperature rise end point is 1350-1450 ℃, and the heat preservation time after the temperature rise end point is reached is 45-85 min.
Further, before the furnace temperature of the fifth sintering stage is increased to the liquid phase temperature of the Co phase, the electromagnetic valve of pulse intermittent partial pressure is opened and protective gas is filled into the furnace to adjust the vacuum degree in the furnace.
In the fifth sintering stage, the Co phase liquid phase temperature is 1280-1350 ℃, so that the electromagnetic valve with pulse intermittent partial pressure needs to be opened before the temperature is increased to the Co phase liquid phase temperature, namely the temperature for opening the electromagnetic valve is 1220-1270 ℃.
Furthermore, the pulse pause time is 10-60 s, the partial pressure time is 0.5-3 s, and the pressure in the furnace is 10-300 Pa.
Further, the protective gas is nitrogen or argon.
According to the invention, the flow of the protective gas is controlled through intermittent partial pressure, so that the vacuum degree in the furnace can be adjusted, the problem of easy volatilization of the binder phase Co is prevented, the prepared WC-Co hard alloy has excellent comprehensive properties such as high compactness, high toughness and high strength, the vacuum degree can be controlled not to be too low, and the carburization phenomenon in the hard alloy preparation process is prevented. In addition, the consumption of protective gas can be saved, and waste is avoided.
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The WC-Co cemented carbide in this example was YG 6.
The alloy raw materials are placed in a vacuum calcining furnace to carry out stepped heating sintering in five sintering stages.
A first sintering stage: heating the raw materials to 200 ℃ for 30min, and then preserving heat for 30 min;
a second sintering stage: heating the raw materials to 400 ℃ for 40min, and then preserving heat for 60 min;
a third sintering stage: heating the raw materials to 710 ℃ for 70min, and then preserving heat for 70 min;
a fourth sintering stage: heating the raw materials to 1210 deg.C for 70min, and keeping the temperature for 70 min;
a fifth sintering stage: the raw materials are heated to 1420 ℃ for 65min and then are insulated for 60 min.
In the fifth sintering stage, when the temperature is increased to 1230 ℃, opening a pulse intermittent partial pressure electromagnetic valve and filling nitrogen into the furnace, wherein the pulse intermittent time is 10s, the partial pressure time is 1.5s, and the internal pressure of the furnace is controlled to be 120-200 Pa.
And stopping heating after the heat preservation process of the fifth sintering stage is finished, closing the electromagnetic valve for pulse intermittent partial pressure and finishing partial pressure when the furnace temperature is cooled to 1100 ℃, and cooling to room temperature along with the furnace to finish the sintering of the WC-Co hard alloy.
The fracture toughness of the obtained WC-Co hard alloy is 9.4 MPa.m1/2The transverse rupture strength is 1800MPa, the Co content measured by a cobalt magnetic measuring instrument is 5.4 percent, the Co loss is 0.6 percent, and a metallographic test shows that the alloy does not contain a graphite phase.
Example 2
The WC-Co cemented carbide in this example was YG 8.
The alloy raw materials are placed in a vacuum calcining furnace to carry out stepped heating sintering in five sintering stages.
A first sintering stage: heating the raw materials to 200 ℃ for 30min, and then preserving heat for 30 min;
a second sintering stage: heating the raw materials to 410 ℃ for 30min, and then preserving heat for 60 min;
a third sintering stage: heating the raw materials to 700 deg.C for 60min, and keeping the temperature for 60 min;
a fourth sintering stage: heating the raw materials to 1200 ℃ for 60min, and then preserving heat for 60 min;
a fifth sintering stage: the raw materials are heated to 1400 ℃ for 65min and then are kept warm for 60 min.
In the fifth sintering stage, when the temperature is raised to 1250 ℃, an electromagnetic valve of pulse intermittent partial pressure is opened, nitrogen is filled into the furnace, the pulse intermittent time in the process is 15s, the partial pressure time is 1s, and the pressure in the furnace is controlled to be 10-100 Pa.
And stopping heating after the heat preservation process of the fifth sintering stage is finished, closing the electromagnetic valve for pulse intermittent partial pressure and finishing partial pressure when the furnace temperature is cooled to 1110 ℃, and cooling to room temperature along with the furnace to finish the sintering of the WC-Co hard alloy.
The fracture toughness of the obtained WC-Co hard alloy is 10.2 MPa.m1/2The transverse rupture strength is 2050MPa, the Co content measured by a cobalt magnetic measuring instrument is 7.1 percent, the Co loss is 0.9 percent, and a metallographic test shows that the alloy does not contain a graphite phase.
Example 3
The WC-Co cemented carbide in this example was YG 6.
The alloy raw materials are placed in a vacuum calcining furnace to carry out stepped heating sintering in five sintering stages.
A first sintering stage: heating the raw materials to 190 deg.C for 20min, and keeping the temperature for 30 min;
a second sintering stage: heating the raw materials to 390 ℃ for 30min, and then preserving heat for 50 min;
a third sintering stage: heating the raw materials to 690 ℃ for 60min, and keeping the temperature for 50 min;
a fourth sintering stage: heating the raw materials to 1190 deg.C for 60min, and keeping the temperature for 55 min;
a fifth sintering stage: the raw materials are heated to 1350 ℃ for 45min and then are kept warm for 45 min.
In the fifth sintering stage, when the temperature is increased to 1220 ℃, a pulse intermittent partial pressure electromagnetic valve is opened, argon is filled into the furnace, the pulse intermittent time in the process is 10s, the partial pressure time is 0.5s, and the internal pressure of the furnace is controlled to be 10-50 Pa.
And stopping heating after the heat preservation process of the fifth sintering stage is finished, closing the electromagnetic valve for pulse intermittent partial pressure and finishing partial pressure when the furnace temperature is cooled to 1090 ℃, and cooling to room temperature along with the furnace to finish the sintering of the WC-Co hard alloy.
The fracture toughness of the obtained WC-Co hard alloy is 9.2 MPa.m1/2The transverse rupture strength is 1795MPa, the Co content measured by a cobalt magnetic measuring instrument is 5.3 percent, the Co loss is 0.7 percent, and a metallographic test shows that the alloy does not contain a graphite phase.
Example 4
The WC-Co cemented carbide in this example was YG 8.
The alloy raw materials are placed in a vacuum calcining furnace to carry out stepped heating sintering in five sintering stages.
A first sintering stage: heating the raw materials to 210 ℃ for 40min, and then preserving heat for 60 min;
a second sintering stage: heating the raw materials to 410 ℃ for 40min, and then preserving heat for 70 min;
a third sintering stage: heating the raw materials to 710 ℃ for 90min, and then preserving heat for 70 min;
a fourth sintering stage: heating the raw materials to 1210 deg.C for 90min, and keeping the temperature for 70 min;
a fifth sintering stage: the temperature of the raw materials is raised to 1450 ℃ after 85min, and then the temperature is kept for 100 min.
In the fifth sintering stage, when the temperature rises to 1270 ℃, opening a pulse intermittent partial pressure electromagnetic valve and filling argon into the furnace, wherein the pulse intermittent time is 60s, the partial pressure time is 3s, and the pressure in the furnace is controlled to be 250-300 Pa.
And stopping heating after the heat preservation process of the fifth sintering stage is finished, closing the electromagnetic valve for pulse intermittent partial pressure and finishing partial pressure when the furnace temperature is cooled to 1110 ℃, and cooling to room temperature along with the furnace to finish the sintering of the WC-Co hard alloy.
The fracture toughness of the obtained WC-Co hard alloy is 10.3 MPa.m1/2The transverse rupture strength is 2020MPa, the Co content measured by a cobalt magnetic measuring instrument is 7.3 percent, the Co loss is 0.7 percent, a metallographic test shows that the alloy has no graphite phase, and the fracture morphology is shown in figure 1.
Comparative example 1
The WC-Co cemented carbide in this comparative example was YG 6.
The only difference from example 1 is that the pulsed intermittent partial pressure is not applied in the fifth sintering stage, and the furnace pressure is controlled to 10 throughout the sintering stage-2～10-3In the Pa range.
The fracture toughness of the obtained hard alloy is 7.2 MPa.m1/2The transverse rupture strength is 1450MPa, and the Co content measured by a cobalt magnetic measuring instrument is 3.9 percent. No graphite phase was observed after metallographic testing of the samples.
Comparative example 2
The WC-Co cemented carbide in this comparative example was YG 8.
The difference from the embodiment 4 is only that the pressure in the furnace in the fifth sintering stage is controlled within the range of 400 to 500 Pa.
The fracture toughness of the obtained hard alloy is 8.9 MPa.m1/2The transverse rupture strength is 1850MPa, the Co content is 7.3 percent and the Co loss is 0.7 percent as measured by a cobalt magnetic measuring instrument, the fracture morphology is shown in figure 2, and the fracture morphology in the alloy fault can be clearly seenThe appearance of graphite sheets, metallographic examination of which also showed the presence of graphite phases in the alloy, is shown in figure 3 for EDS elemental analysis.
Through comparison between the two groups of examples and comparative examples, the fact that when the pressure in the furnace is low, namely the furnace is in a high vacuum state, the loss of Co is large at the moment, and the performance of the alloy is influenced can be found; when the pressure in the furnace is higher, namely the furnace is in a low vacuum state, the loss of Co is smaller, but the alloy has a carburizing phenomenon, and the performance of the alloy is also influenced.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A sintering method of WC-Co hard alloy is characterized by adopting step-type temperature rise sintering, adjusting the vacuum degree in a furnace before the temperature rises to the liquid phase temperature of a Co phase, stopping heating after the temperature is kept, finishing partial pressure when the furnace temperature is cooled to 1090-1110 ℃, and cooling to the room temperature along with the furnace to finish the sintering of the WC-Co hard alloy.
2. The WC-Co cemented carbide sintering method of claim 1, wherein the stepped temperature rise sintering comprises a first sintering stage, a second sintering stage, a third sintering stage, a fourth sintering stage, and a fifth sintering stage.
3. The method for sintering WC-Co cemented carbide as claimed in claim 2, wherein the temperature rise time in the first sintering stage is 20 to 40min, the temperature rise end point is 190 to 210 ℃, and the holding time after reaching the temperature rise end point is 30 to 60 min.
4. The method for sintering WC-Co cemented carbide as claimed in claim 2, wherein the temperature rise time in the second sintering stage is 30 to 40min, the temperature rise end point is 390 to 410 ℃, and the heat retention time after reaching the temperature rise end point is 50 to 70 min.
5. The method for sintering WC-Co cemented carbide as claimed in claim 2, wherein the temperature rise time in the third sintering stage is 60 to 90min, the temperature rise end point is 690 to 710 ℃, and the holding time after reaching the temperature rise end point is 50 to 70 min.
6. The method for sintering WC-Co cemented carbide as claimed in claim 2, wherein the temperature rise time in the fourth sintering stage is 60 to 90min, the temperature rise end point is 1190 to 1210 ℃, and the heat retention time after reaching the temperature rise end point is 55 to 70 min.
7. The WC-Co hard alloy sintering method according to claim 2, wherein the temperature rise time in the fifth sintering stage is 45-85 min, the temperature rise end point is 1350-1450 ℃, and the holding time after reaching the temperature rise end point is 45-85 min.
8. The WC-Co cemented carbide sintering method as claimed in claim 7, wherein before the furnace temperature in the fifth sintering stage is increased to the Co phase liquid phase temperature, a solenoid valve for pulse intermittent partial pressure is opened and a shielding gas is charged into the furnace to adjust the degree of vacuum in the furnace.
9. The WC-Co hard alloy sintering method according to claim 8, wherein the liquid-phase temperature of the Co phase is 1280-1350 ℃, when the temperature in the furnace rises to 1220-1270 ℃, a pulse intermittent partial pressure electromagnetic valve is opened, and protective gas is filled into the furnace, wherein the protective gas is nitrogen or argon.
10. The WC-Co cemented carbide sintering method according to claim 7, wherein the pulse pause time of the fifth sintering stage is 10 to 60 seconds, the partial pressure time is 0.5 to 3 seconds, and the pressure in the furnace is 10 to 300 Pa.
CN202110949416.8A 2021-08-18 2021-08-18 Sintering method of WC-Co hard alloy Active CN113637862B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110949416.8A CN113637862B (en) 2021-08-18 2021-08-18 Sintering method of WC-Co hard alloy

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110949416.8A CN113637862B (en) 2021-08-18 2021-08-18 Sintering method of WC-Co hard alloy

Publications (2)

Publication Number Publication Date
CN113637862A true CN113637862A (en) 2021-11-12
CN113637862B CN113637862B (en) 2022-05-24

Family

ID=78422701

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110949416.8A Active CN113637862B (en) 2021-08-18 2021-08-18 Sintering method of WC-Co hard alloy

Country Status (1)

Country Link
CN (1) CN113637862B (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5151247A (en) * 1990-11-05 1992-09-29 Sandvik Ab High pressure isostatic densification process
JP2001329331A (en) * 2000-05-19 2001-11-27 Hitachi Tool Engineering Ltd High hardness and high toughness cemented carbide and its production method
CN102634685A (en) * 2011-02-10 2012-08-15 厦门金鹭特种合金有限公司 Ultra-coarse grain cemented carbide secondary liquid-phase sintering process
CN108165861A (en) * 2018-02-08 2018-06-15 合肥工业大学 A kind of method that nanometer WC-6Co composite powders to add Co powder prepare ultra-fine cemented carbide as raw material

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5151247A (en) * 1990-11-05 1992-09-29 Sandvik Ab High pressure isostatic densification process
JP2001329331A (en) * 2000-05-19 2001-11-27 Hitachi Tool Engineering Ltd High hardness and high toughness cemented carbide and its production method
CN102634685A (en) * 2011-02-10 2012-08-15 厦门金鹭特种合金有限公司 Ultra-coarse grain cemented carbide secondary liquid-phase sintering process
CN108165861A (en) * 2018-02-08 2018-06-15 合肥工业大学 A kind of method that nanometer WC-6Co composite powders to add Co powder prepare ultra-fine cemented carbide as raw material

Also Published As

Publication number Publication date
CN113637862B (en) 2022-05-24

Similar Documents

Publication Publication Date Title
CN108060322B (en) Preparation method of hard high-entropy alloy composite material
CN105695837B (en) A kind of preparation method of WC Ni fine grained cemented carbides
CN108213422B (en) Preparation method of carbon-containing high-entropy alloy composite material
Li et al. Effect of Mo addition on the microstructure and mechanical properties of ultra-fine grade TiC–TiN–WC–Mo2C–Co cermets
CN110396632B (en) Ti (C, N) -based metal ceramic with homogeneous ring core structure and preparation method thereof
CN109022990B (en) Preparation method of high-entropy alloy binding phase Ti (C, N) -based metal ceramic
CN109161711B (en) Superfine crystal gradient hard alloy with double-gradient-layer structure on surface and preparation method thereof
CN104630533B (en) A kind of preparation method of the composite hard alloy of cutter material
CN107829007A (en) A kind of method that high-entropy alloy and powder metallurgic method prepare high-entropy alloy block
CN104388722A (en) Hard alloy with binding phase intensified by virtue of heat treatment and preparation method of hard alloy
CN110358960B (en) Preparation method of high-strength and high-toughness Ti (C, N) -based metal ceramic
CN105177397A (en) Preparation method for powder metallurgy wear-resisting stainless steel
CN108642361B (en) High-strength high-hardness ceramic material and production process thereof
CN111560564B (en) Resource-saving high-nitrogen duplex stainless steel and near-net forming method thereof
CN113502428B (en) Method for preparing high-nitrogen nickel-free austenitic stainless steel and product thereof
Upadhyaya et al. Advances in sintering of hard metals
CN105238957B (en) A kind of high-performance high-temperature nickel-base alloy and its manufacture method
Zeng et al. Effect of WC addition on the microstructure and mechanical properties of TiN-based cermets
CN113046612B (en) Surface layer decarburization phase gradient hard alloy material and preparation method thereof
CN113637862B (en) Sintering method of WC-Co hard alloy
CN113953517A (en) 3D printing preparation method of high-density hard alloy block
CN103785836A (en) Powder metallurgy process
CN106637052A (en) Method for improving carbon potential of low-carbon hard alloy
Danninger et al. Powder metallurgy manufacturing of carbon-free precipitation hardened high speed steels
Archana et al. Influence of applied pressure during field-assisted sintering of Ti (C, N)–WC–FeAl based nanocomposite

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant