CN111250711A - One-step forming preparation method of titanium carbonitride base metal ceramic stirring head - Google Patents

One-step forming preparation method of titanium carbonitride base metal ceramic stirring head Download PDF

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Publication number
CN111250711A
CN111250711A CN202010161065.XA CN202010161065A CN111250711A CN 111250711 A CN111250711 A CN 111250711A CN 202010161065 A CN202010161065 A CN 202010161065A CN 111250711 A CN111250711 A CN 111250711A
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Prior art keywords
cushion block
stirring head
titanium carbonitride
pressing
sleeve
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CN202010161065.XA
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CN111250711B (en
Inventor
刘含莲
杨金帅
黄传真
朱洪涛
邹斌
姚鹏
董丰波
李成伍
江国焱
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Shandong University
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Shandong University
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • 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
    • B22F3/02—Compacting only
    • B22F3/03—Press-moulding apparatus therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • 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
    • B22F3/12—Both compacting and sintering
    • B22F3/14—Both compacting and sintering simultaneously
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/02—Making metallic powder or suspensions thereof using physical processes
    • B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
    • B23K20/12—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding
    • B23K20/122—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding using a non-consumable tool, e.g. friction stir welding
    • B23K20/1245—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding using a non-consumable tool, e.g. friction stir welding characterised by the apparatus
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
    • B23K20/26—Auxiliary equipment
    • 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
    • C22C29/005—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides 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
    • C22C29/04—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 carbonitrides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/02—Making metallic powder or suspensions thereof using physical processes
    • B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
    • B22F2009/043—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling by ball milling

Abstract

The invention provides a one-step forming preparation method of a titanium carbonitride base metal ceramic stirring head, which specifically comprises the steps of treating mixed powder, manufacturing a die pressing device, carrying out vacuum hot-pressing sintering and taking out the stirring head. The die assembly comprises a pressure head, a sleeve, a pressing cushion block, a die, a forming cushion block, a common cushion block and a tray, wherein the sleeve is in interference fit with the die, the end part of the sleeve is parallel and level, the forming cushion block is of a hollow circular through hole structure, the inner cavity of the forming cushion block is the same as the size and the shape of a stirring pin, the inner cavity of the sleeve is the same as the size and the shape of the shaft shoulder part of the stirring head, the middle part of the pressing cushion block, which is contacted with powder, is of a convex structure, the bulge is cylindrical and is the same as the size and the. The stirring head obtained by the invention has excellent performance, does not have the stress concentration problem caused by secondary processing, is simple to operate and is easy for industrial production.

Description

One-step forming preparation method of titanium carbonitride base metal ceramic stirring head
Technical Field
The invention belongs to the technical field of friction stir welding and ceramic material preparation, and particularly relates to a one-step forming preparation method of a titanium carbonitride base cermet stirring head.
Background
The information in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.
Friction stir welding is a new solid phase joining technology, and mainly generates friction heat through stirring between a stirring head and a welded workpiece, so that the welded metal is in a thermoplastic state, and plastically flows from the front end to the rear part under the pressure action of the stirring head, and the welded workpiece is welded into a whole. Due to the special connection mechanism of friction stir welding, the stir head becomes the core of the welding technology, and directly bears the heat load, the force load and the friction and wear in the welding process, so the material used for manufacturing the stir head is required to have the melting point, the strength and the hardness which are higher than those of the welded material, and good abrasion resistance and high temperature resistance. The highest temperature of the high-melting-point material during welding can reach over 1000 ℃, the current stirring head for welding the high-melting-point material mainly takes a tungsten-based material and a cubic boron nitride material as main materials, the tungsten-based material is expensive, the forming is difficult, and the manufacturing cost is high.
The performance of the titanium carbonitride based cermet material is between that of ceramic and hard alloy, so that the titanium carbonitride based cermet material not only maintains higher hardness, wear resistance and good chemical stability, but also has higher bending strength and fracture toughness, but the forming of the stirring head with a step shape and a complex structure is more difficult, and the manufacturing cost of a plurality of processes limits the application in the field of friction stir welding.
Disclosure of Invention
In view of the problems in the prior art, the invention aims to provide a one-step forming preparation method of a titanium carbonitride base cermet stirring head. The metal ceramic stirring head is prepared by adopting a compression molding and primary sintering method, the problem of poor densification degree is solved by improving a compression molding mode, the requirement on processing precision is met, secondary processing of the stirring head is directly reduced, the production efficiency of the stirring head is greatly improved, and meanwhile, the manufacturing cost is reduced.
In order to solve the technical problems, the technical scheme of the invention is as follows:
in a first aspect, a one-step forming preparation method of a titanium carbonitride base cermet stirring head comprises the following steps:
titanium carbonitride (Ti (C)0.7,N0.3) Carrying out wet grinding and drying treatment;
drying the treated Ti (C)0.7,N0.3) Mixing with other raw materials, wet grinding, and drying;
pressing the mixed powder by a pressing die device;
carrying out vacuum hot-pressing sintering on the pressed pressing die;
and taking the cooled pressing die.
In some embodiments of the present invention, the ball milling ball for wet milling of titanium carbonitride is cemented carbide, the milling medium is alcohol, and the wet milling time is 65-80 h.
As some embodiments of the invention, the conditions of the drying process after wet milling of titanium carbonitride are: drying at 100-120 ℃, and then sieving, wherein the sieve specification is 90-110 meshes.
As some embodiments of the invention, the ball milling ball for wet milling of the mixed powder is cemented carbide, the milling medium is alcohol, and the wet milling time is 20-25 h.
As some embodiments of the invention, the conditions of the drying process after wet milling of the mixed powder are: drying at 100-120 ℃, and then sieving, wherein the sieve specification is 90-110 meshes. The invention has the function of refining powder by ball milling treatment, namely wet milling treatment of the titanium carbonitride and the mixed powder, is beneficial to reducing the number of air holes of the stirring head and improving the density and the wear resistance of the stirring head.
As some embodiments of the invention, the die assembly comprises a pressure head, a sleeve, a pressure applying cushion block, a die, a forming cushion block, a common cushion block and a tray, wherein the sleeve is in interference fit with the die, the end part of the sleeve is flush, the forming cushion block is of a hollow circular through hole structure, the inner cavity of the forming cushion block is the same as the size and shape of a stirring pin and is placed on the upper side of the common cushion block, the inner cavity of the sleeve is the same as the size and shape of the shaft shoulder part of the stirring head, the middle part of the contact end, connected with the powder, of the pressure applying cushion block is of a convex structure, the convex is cylindrical and is the.
As some embodiments of the invention, the powder first flows into the central cavity in the shaped pad and then fills the internal cavity of the sleeve, the pressure pad is pressed over the powder, and the raised portions are fully pressed into the powder. The matching of the forming cushion block and the pressing cushion block in the invention leads the powder in the cavity to be pressed into the stirring head structure at one time.
As some embodiments of the invention, the fillet radius is 1-1.5 mm; preferably 1 mm. The transition fillet arranged in the invention ensures that the pressing cushion block is not completely matched with the forming cushion block, the axial height from the root fillet of the bulge part of the pressing cushion block to the forming cushion block is smaller than that from other parts, the extrusion of the material at the root of the stirring pin is increased, the problem of serious contraction of the root of the stirring pin is solved, and simultaneously, the bonding between the side surface of the stirring pin and the wall surface of the cavity in the middle of the forming cushion block is reduced because the root of the stirring pin is pressed more than the side surface, and the material taking is convenient.
As some embodiments of the invention, the specific steps of the compression molding by using the compression molding device are as follows: the method comprises the steps of firstly, placing a sleeve into a die, performing interference fit, enabling the end parts to be parallel and level, sequentially placing a common cushion block and a forming cushion block into the sleeve, adding powder, firstly filling a middle cavity in the forming cushion block, continuously feeding after filling and pressing, pressing a pressing cushion block above the powder to enable a protruding part to be completely pressed into the powder, paving and compacting, and performing vacuum sintering on a pressing die. The preparation method of the stirring head is a one-step sintering method, and the maximum size error of the stirring head is smaller than 0.1mm by improving the pressing die, so that the use requirement of welding can be met.
As some embodiments of the invention, the process of sintering comprises: and (3) under a vacuum atmosphere, heating, pressurizing, preserving heat and pressure, preferably, the heating time is 49min, the sintering temperature is 1475 ℃, the sintering pressure is 32MPa, and the preserving heat time is 30 min.
As some embodiments of the invention, the material extraction process: firstly, a radial force vertical to a central shaft is applied to a contact part of a forming cushion block and a common cushion block to enable the common cushion block to fall off under the shearing action, then the forming cushion block is clamped, and a rotation torque around the central shaft is applied to enable a stirring pin to be separated from the forming cushion block. The forming cushion block arranged in the stirring pin forming device is of a hollow through hole structure, is in contact with the common cushion block at the lower layer, is convenient to take materials, and can reduce the adhesion between the bottom surface of the stirring pin and the common cushion block.
In a second aspect, a titanium carbonitride based cermet stirring tip is composed of the following raw materials, by mass, Ti (C)0.7,N0.3)88 parts of Mo, 3.2 parts of Ni and 4.8 parts of Co4.
The invention provides a method for solving the problem of serious abrasion of a stirring head for friction stir welding of a high-melting-point material. The selected stirring head material does not have thermochemical reaction with steel and aluminum, and has good mechanical properties: flexural strength 1543.8MPa, Vickers hardness 15.28GPa and fracture toughness 9.10 MPa.m1/2And the use requirements of friction stir welding can be met.
In a third aspect, the titanium carbonitride base cermet stir head is used in the field of welding.
The invention has the beneficial effects that:
the die assembly designed by the invention has the advantages of reasonable structure, simple processing, convenient operation, easy demoulding and material taking and convenient manufacture. The optimized and sintered stirring head has high density and small size error, the fillet of the convex part of the pressing cushion block ensures that the fillet is not completely matched with the forming cushion block, the extrusion of the material at the root of the stirring pin is increased, the densification degree of the stirring head is excellent, and the problem of serious contraction of the root of the stirring pin is solved, so the maximum size error of the prepared stirring head is less than 0.1mm, and the use requirement of friction stir welding is met. According to the invention, the metal ceramic stirring head is sintered and molded at one time, so that the procedures of turning, grinding and the like can be directly omitted, the production period is greatly reduced, the production cost is reduced, and the problem of stress concentration on the stirring pin root caused by secondary processing such as turning, grinding and the like can be avoided.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the invention and not to limit the invention.
FIG. 1 is a schematic view of a stirring head structure;
FIG. 2 is a schematic view of a die assembly;
FIG. 3 is a schematic size view of the stirring head;
FIG. 4 is a schematic view of a pressing pad and a forming pad provided in example 1;
FIG. 5 is a schematic view of a press pad and a forming pad provided in comparative example 1;
FIG. 6 is a schematic view of a press pad and a forming pad provided in comparative example 2;
the device comprises a shaft shoulder, a stirring pin, a pressure head, a sleeve, a pressure applying cushion block, a powder, a mould, a forming cushion block, a common cushion block, a tray, a supporting block and a fillet, wherein the shaft shoulder is 1, the stirring pin is 2, the pressure head is 3, the sleeve is 4, the pressure applying cushion block is 5, the powder is 6, the mould is 7, the forming cushion block is 8, the.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise. The invention will be further illustrated by the following examples
Example 1
The embodiment provides a method for preparing the stirring head, which comprises the following specific steps:
putting original powder of a titanium carbonitride material into a polyurethane ball milling cylinder, taking hard alloy balls as ball milling balls and alcohol as a ball milling medium, sealing, and then putting the ball milling cylinder on a roller ball mill for independent wet ball milling for 72 hours; putting the ball-milled titanium carbonitride slurry into a vacuum drying oven for drying at the drying temperature of 100-120 ℃, sieving with a 100-mesh sieve after drying, and packaging the sieved powder for later use; referring to fig. 3, the total volume and mass of the stirring head were calculated according to the size of the stirring head designed, and the mixing ratio by mass (Ti (C)0.7,N0.3)88 parts of Mo4 parts, 3.2 parts of Ni and 4.8 parts of Co4) putting the titanium carbonitride powder subjected to ball milling and other metal powder into a polyurethane ball milling cylinder, taking hard alloy balls as ball milling balls and alcohol as a ball milling medium, sealing and then putting the ball milling cylinder into a roller ball mill for ball milling for 24 hours; and (3) drying the mixed slurry subjected to ball milling in a vacuum drying oven at the drying temperature of 100-120 ℃, sieving with a 100-mesh sieve after drying, and packaging the sieved powder for later use.
Referring to fig. 2, the pressing die structure comprises a pressing head 3, a sleeve 4, a pressing cushion block 5, a die 7, a forming cushion block 8, a common cushion block 9 and a tray 10, wherein the sleeve 4 is firstly arranged in the die 7, the ends of the sleeve are parallel and level, the common cushion block 9 and the forming cushion block 8 are sequentially arranged in the sleeve 4, powder 6 is added, a middle cavity in the forming cushion block 6 is firstly filled, the feeding is continued after the pressing cushion block is filled and pressed, the pressing cushion block 5 is pressed above the powder 6, so that the protruding part is completely pressed into the powder 6, the spreading and the pressing are carried out, and the pressing die is arranged in a. Raising the temperature to 1475 ℃ in a vacuum atmosphere for 49min, applying pressure of 32MPa at the temperature, and keeping the temperature for 30 min; after the heat preservation is finished, the temperature is cooled to 200 ℃ along with the water in the furnace cavity, and then the temperature is cooled to room temperature along with the air in the furnace. When materials are taken, firstly, shearing force is applied to the contact part of the forming cushion block 8 and the common cushion block 9 to enable the common cushion block 9 to fall off, then, the rotating torque around the forming cushion block 8 is applied to enable the forming cushion block 8 to be separated from the stirring head, and the obtained stirring head comprises a shaft shoulder 1 and a stirring pin 2 as shown in figure 1.
In the embodiment, a convex fillet cushion block is adopted as the pressure applying cushion block 5 and is not completely matched with the forming cushion block 8, referring to fig. 4, the radius of the fillet 11 is respectively 1.0mm, 1.2mm and 1.5mm, after sintering and cooling, the actual size is measured, referring to the parameter attached table in embodiment 1, the maximum size error of the sintered stirring head is less than 1mm, and the stirring head finished product for friction stir welding is prepared.
Example 1 attached Table of parameters
Figure BDA0002405808190000061
Comparative example 1
This example provides a method for manufacturing the stirring pin, which comprises substantially the same steps as those of example 1, except that in the step of press-molding, a flat pad is used as the pressing pad 5, and after sintering and cooling, the actual size of the stirring pin is measured, as shown in fig. 5: diameter 4.88mm, length 4.23mm, theoretical size of the pin: the diameter is 6.00mm, the length is 6.00mm, the maximum size error of the stirring head is more than 1.7mm, and the shrinkage is serious in the axial direction and the radial direction.
Comparative example 2
The embodiment provides a method for preparing the stirring head, which has the same specific steps as those in embodiment 1, except that in the compression molding step, a convex right-angle cushion block is adopted as a pressing cushion block 5 and is completely matched with a molding cushion block 8, and referring to fig. 6, after sintering and cooling, the stirring needle is seriously bonded with the molding cushion block 8, and the material taking is difficult.
The preparation method of the invention leads the stirring head to be sintered and molded at one time, can directly save the working procedures of turning, grinding and the like, avoids the stress concentration problem at the root of the stirring pin, and the sintered stirring head has good use performance.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A one-step forming preparation method of a titanium carbonitride base cermet stirring head is characterized by comprising the following steps: the method comprises the following steps:
wet grinding and drying the titanium carbonitride;
drying the treated Ti (C)0.7,N0.3) Mixing with other raw materials, wet grinding, and drying;
pressing the mixed powder by a pressing die device;
carrying out vacuum hot-pressing sintering on the pressed pressing die;
and taking the cooled pressing die.
2. The one-step forming method for preparing a titanium carbonitride based cermet stirring head as set forth in claim 1, wherein: the ball milling ball for wet milling of the titanium carbonitride is made of hard alloy, the ball milling medium is alcohol, and the wet milling time is 65-80 h.
3. The one-step forming method for preparing a titanium carbonitride based cermet stirring head as set forth in claim 1, wherein: conditions of drying treatment after wet grinding: drying at 100-120 ℃, and then sieving, wherein the sieve specification is 90-110 meshes.
4. The one-step forming method for preparing a titanium carbonitride based cermet stirring head as set forth in claim 1, wherein: the ball milling ball for wet milling the mixed powder is hard alloy, the ball milling medium is alcohol, and the wet milling time is 20-25 h.
5. The one-step forming method for preparing a titanium carbonitride based cermet stirring head as set forth in claim 1, wherein: conditions of drying treatment after wet grinding: drying at 100-120 ℃, and then sieving, wherein the sieve specification is 90-110 meshes.
6. The one-step forming method for preparing a titanium carbonitride based cermet stirring head as set forth in claim 1, wherein: the die assembly comprises a pressure head, a sleeve, a pressing cushion block, a die, a forming cushion block, a common cushion block and a tray, wherein the sleeve is in interference fit with the die, the end part of the sleeve is parallel and level, the forming cushion block is of a hollow circular through hole structure, an inner cavity of the forming cushion block is the same as the size and shape of a stirring pin and is placed on the upper side of the common cushion block, the size and shape of the inner cavity of the sleeve are the same as those of a shaft shoulder part of the stirring head, the middle part of the contact end of the pressing cushion block and powder is of a bulge structure, the bulge is cylindrical and is the same;
preferably, the fillet radius is 1-1.5 mm.
7. The one-step forming method for preparing a titanium carbonitride based cermet stirring head as set forth in claim 6, wherein: the charging method comprises the following steps: the method comprises the steps of firstly, placing a sleeve into a die, performing interference fit, enabling the end parts to be parallel and level, sequentially placing a common cushion block and a forming cushion block into the sleeve, adding powder, firstly filling a middle cavity in the forming cushion block, continuously feeding after filling and compressing, pressing a pressing cushion block above the powder, enabling the protruding part to be completely pressed into the powder, and paving and compacting. Preferably, the sintering process comprises: under the vacuum atmosphere, heating, pressurizing, preserving heat and maintaining pressure; more preferably, the temperature rise time is 49min, the sintering temperature is 1475 ℃, the sintering pressure is 32MPa, and the heat preservation time is 30 min.
8. The method for preparing a titanium carbonitride-based cermet stirring head as set forth in claim 7, wherein: taking materials: firstly, a radial force vertical to a central shaft is applied to a contact part of a forming cushion block and a common cushion block to enable the common cushion block to fall off under the shearing action, then the forming cushion block is clamped, and a rotation torque around the central shaft is applied to enable a stirring pin to be separated from the forming cushion block.
9. The titanium carbonitride-based cermet stirring head prepared by the preparation method as set forth in any one of claims 1 to 9, characterized in that: is prepared from Ti (C)0.7,N0.3)88 parts of Mo, 3.2 parts of Ni and 4.8 parts of Co4.
10. The titanium carbonitride based cermet stir head of claim 9 is used in the welding field.
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Publication number Priority date Publication date Assignee Title
US11772188B1 (en) * 2021-11-04 2023-10-03 Lockheed Martin Corporation Additive friction stir deposition system for refractory metals

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