CN112430761A - TiB2/Ti(C,N)/Al2O3Preparation method of ceramic cutter material - Google Patents

TiB2/Ti(C,N)/Al2O3Preparation method of ceramic cutter material Download PDF

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CN112430761A
CN112430761A CN202011114714.7A CN202011114714A CN112430761A CN 112430761 A CN112430761 A CN 112430761A CN 202011114714 A CN202011114714 A CN 202011114714A CN 112430761 A CN112430761 A CN 112430761A
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ball
green body
drying
powder
ceramic
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周后明
达丽梅
张高峰
周金虎
陈滋鑫
刘刚
尹杰
朱宇旭
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Xiangtan University
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Xiangtan University
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    • 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
    • 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
    • B22F3/10—Sintering only
    • B22F3/1003—Use of special medium during sintering, e.g. sintering aid
    • B22F3/1007—Atmosphere
    • 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
    • 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
    • C22C29/14—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on borides
    • 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 discloses a TiB2/Ti(C,N)/Al2O3The preparation method of ceramic cutting tool material is characterized by mixing Ti (C, N) and Al2O3Preparing a sintering aid into slurry, and mixing the slurry with TiB2Uniformly mixing, drying to obtain composite ceramic powder, prepressing the composite ceramic powder into a blank, and carrying out vacuum hot-pressing sintering on the blank to obtain a titanium diboride-based ceramic cutter material; the vacuum hot-pressing sintering process comprises the following steps: the vacuum degree in the furnace is lower than 0.01MPa, and the furnace is firedSetting the initial pressure before the solidification to be 10MPa, increasing the pressure to 25MPa in the heat preservation stage, completing the pressure relief after heat preservation, raising the temperature from room temperature to 1600 ℃ at the temperature raising speed of 45 ℃/min, preserving the heat for 60min, and then cooling along with the furnace. The invention provides a preparation method of the ceramic cutting tool. Compared with the traditional ceramic cutter, the ceramic cutter prepared by the invention has excellent comprehensive mechanical properties, can meet the increasingly improved performance requirements of the market on the ceramic cutter, and is beneficial to further expanding the application range of the ceramic cutter.

Description

TiB2/Ti(C,N)/Al2O3Preparation method of ceramic cutter material
Technical Field
The invention relates to the field of ceramics, in particular to a TiB2/Ti(C,N)/Al2O3A preparation method of a ceramic cutter material.
Background
The high-speed cutting is taken as a key part in the advanced manufacturing technology, and plays an important role in the modern fields of dies, automobiles, aviation manufacturing and the like, particularly, the requirement on the performance of the cutter is higher when the high-speed cutting is carried out on the nickel-based high-temperature alloy, and the development of the ceramic cutter not only has important influence on the development of the high-speed cutting processing, but also can effectively save resources, reduce the cost and is beneficial to realizing the sustainable development of the resources.
Because titanium diboride has better chemical stability, wear resistance and corrosion resistance, the requirements for manufacturing high-wear-resistance and heat-resistance components are met, and when the titanium diboride is cut at high speed in the air, titanium elements and boron elements and oxygen elements form a lubricating film, so that the friction force can be effectively reduced. Because the fracture toughness and the bending strength of the titanium diboride are low, the titanium carbonitride is introduced into the titanium diboride-based ceramic material, so that the fracture toughness of the base material can be improved while the excellent performance of the titanium diboride is exerted, the problem of ductility and toughness of the ceramic cutter during high-speed cutting is solved, the sintered titanium diboride ceramic cutter material has good mechanical property, meets the requirement of high-speed cutting of nickel-based high-temperature alloy on the cutter, and has wide application prospect.
Disclosure of Invention
The invention aims to provide a titanium diboride-based composite ceramic cutter material and a preparation method thereof, so as to improve the plasticity and toughness of a ceramic cutter during high-speed cutting of nickel-based high-temperature alloy.
In order to solve the technical problems, the invention adopts the following technical scheme:
the titanium diboride-based composite ceramic tool is prepared from the following materials in parts by mass: titanium diboride (TiB)2) 53-61%, titanium carbonitride (Ti (C, N)): 8-31%, alumina (Al)2O3) 0-23%, nickel (Ni) 5-10%, molybdenum (Mo): 3 to 6 percent.
In the present invention to adopt TiB2As matrix material, Ti (C, N) and Al2O3Ni and Mo are selected as binder phases for reinforcing the phase.
The invention also protects the preparation process of the intermetallic compound composite ceramic cutter, and the method comprises the following steps:
(1) the powder is prepared according to the mass ratio, and then is ball-milled in a ball mill by taking absolute ethyl alcohol as a ball-milling medium, wherein the ball-milling tank and the ball-milling material are all stainless steel.
(2) Pouring the ball-milled flowing slurry into a glass ware, and putting the glass ware into a DZ-1BC II vacuum drying oven for heating and drying.
(3) After drying, cooling to room temperature and sieving with a 150-mesh sieve.
(4) And spreading the uniformly mixed powder into an inner sleeve of the metal mold.
(5) The press machine adopted by green body prepressing is a 769YP-30T powder press machine, in order to ensure the integrity of the green body, an upside-down mould taking mode is adopted, an upper pressure head-graphite gasket-green body-graphite gasket-a lower pressure head are sequentially arranged from top to bottom, and the prepared green body is loaded into a graphite mould for sintering.
In the step (1), ball milling is carried out in a ball mill for 48 hours at a ball-material ratio of 8:1, the set rotating speed of the ball mill is 275r/min, the positive and negative rotating directions are automatically changed once every 30 minutes, and the middle rotating is stopped for 5 minutes.
In the step (1), the material comprises the following components in percentage by mass: titanium diboride (TiB)2) 53-61%, titanium carbonitride (Ti (C, N)): 8-31%, alumina (Al)2O3) 0-23%, nickel (Ni) 5-10%, molybdenum (Mo): 3 to 6 percent.
In the step (2), in order to avoid slurry loss or mutual pollution of the composite materials caused by alcohol boiling during drying, the composite materials are dried for 5 hours at a low vacuum degree of 70 ℃ and then dried at a high vacuum degree of 110 ℃ until the drying is finished.
In the step (5), the green compact prepressing pressure is 10MPa, and the time is kept for 20 min.
Compared with the prior art, the invention has the following remarkable characteristics:
compared with metal toughened composite ceramic, Ti (C, N) and Al2O3The mechanical property of the synergistic toughening composite ceramic material sample is improved to a certain extent, and the bending strength, hardness and fracture toughness of the titanium diboride-based composite ceramic material are in Ni3The Al content is improved at the same time with different improvements.
Description of the drawings:
FIG. 1 shows the mechanical properties of the composite ceramic cutting tool materials prepared in examples 1 to 4 and Al2O3The relation of contents;
FIG. 2 is a graph showing the relationship between the mechanical properties of the composite ceramic cutting tool materials prepared in examples 5 to 8 and the sintering temperature;
FIG. 3 is an XRD pattern of composite ceramic cutting tool materials prepared in examples 1-4;
FIG. 4 is an XRD pattern of composite ceramic cutting tool materials prepared in examples 5-8.
The specific implementation mode is as follows:
in order to make the technical solutions of the present disclosure more clearly understood by those skilled in the art, the technical solutions of the present disclosure will be described in detail below with reference to specific embodiments.
Example 1(G1)
A titanium diboride-based composite ceramic cutter mainly comprises the following preparation steps:
(1) weighing: 61% TiB by volume fraction2Powder, 31% of Ti (C, N) powder, 5% of Ni powder and 3% of Mo powder.
(2) Ball milling: pouring the proportioned powder into a ball milling tank, cleaning and drying the ball milling tank by using an ultrasonic cleaning machine before use, putting ball milling beads with different diameters into the tank at a ball-material ratio of 8:1, wet-milling by using absolute ethyl alcohol as a medium, setting the rotating speed of the ball mill to be 275r/min, automatically changing the forward and reverse rotating direction every 30 minutes, and stopping rotating for 5 minutes in the middle.
(3) And (3) drying: and pouring the ball-milled flowing slurry into a glass ware, drying for 5 hours at a low vacuum degree of 70 ℃ and then at a high vacuum degree of 110 ℃ until the drying is finished in order to avoid slurry loss or mutual pollution of composite materials caused by boiling of alcohol, and sieving by a 150-mesh sieve after the drying is finished and the temperature is cooled to room temperature.
(4) Molding: and (3) paving the uniformly mixed powder into an inner sleeve of a metal die, keeping the green body prepressing pressure at 10MPa for 20min, adopting a 769YP-30T powder tablet press as a press machine for green body prepressing, adopting an inverted mould-taking mode to ensure the integrity of the green body, sequentially arranging an upper pressure head, a graphite gasket, the green body, the graphite gasket and a lower pressure head from top to bottom, and loading the prepared green body into the graphite die for sintering.
(5) And (3) sintering: putting the graphite mould with the green body into a sintering furnace, carrying out vacuum hot-pressing sintering, setting the initial pressure before sintering to 10MPa according to the influence of volume change on the density, increasing the pressure to 25MPa in the heat preservation stage, completing pressure relief after heat preservation, increasing the temperature rise speed to 1600 ℃ from the room temperature at 45 ℃/min, preserving the heat for 60min, and then cooling along with the furnace to obtain Ti (C, N) toughened TiB2A base ceramic cutting tool material.
Example 2(G2)
A titanium diboride-based composite ceramic cutter mainly comprises the following preparation steps:
(1) weighing: 61% TiB by volume fraction2Powder, 24% Ti (C, N) powder, 7% Al2O3Powder, 5% of Ni powder and 3% of Mo powder.
(2) Ball milling: pouring the proportioned powder into a ball milling tank, cleaning and drying the ball milling tank by using an ultrasonic cleaning machine before use, putting ball milling beads with different diameters into the tank at a ball-material ratio of 8:1, wet-milling by using absolute ethyl alcohol as a medium, setting the rotating speed of the ball mill to be 275r/min, automatically changing the forward and reverse rotating direction every 30 minutes, and stopping rotating for 5 minutes in the middle.
(3) And (3) drying: and pouring the ball-milled flowing slurry into a glass ware, drying for 5 hours at a low vacuum degree of 70 ℃ and then at a high vacuum degree of 110 ℃ until the drying is finished in order to avoid slurry loss or mutual pollution of composite materials caused by boiling of alcohol, and sieving by a 150-mesh sieve after the drying is finished and the temperature is cooled to room temperature.
(4) Molding: and (3) paving the uniformly mixed powder into an inner sleeve of a metal die, keeping the green body prepressing pressure at 10MPa for 20min, adopting a 769YP-30T powder tablet press as a press machine for green body prepressing, adopting an inverted mould-taking mode to ensure the integrity of the green body, sequentially arranging an upper pressure head, a graphite gasket, the green body, the graphite gasket and a lower pressure head from top to bottom, and loading the prepared green body into the graphite die for sintering.
(5) And (3) sintering: putting the graphite mould with the green body into a sintering furnace, carrying out vacuum hot-pressing sintering, setting the initial pressure before sintering to 10MPa according to the influence of volume change on the density, increasing the pressure to 25MPa in the heat preservation stage, completing pressure relief after heat preservation, increasing the temperature rise speed to 1600 ℃ from the room temperature at 45 ℃/min, preserving the heat for 60min, and then cooling along with the furnace to obtain Ti (C, N) toughened TiB2A base ceramic cutting tool material.
Example 3(G3)
A titanium diboride-based composite ceramic cutter mainly comprises the following preparation steps:
(1) weighing: 61% TiB by volume fraction2Powder, 16% Ti (C, N) powder, 15% Al2O3Powder, 5% of Ni powder and 3% of Mo powder.
(2) Ball milling: pouring the proportioned powder into a ball milling tank, cleaning and drying the ball milling tank by using an ultrasonic cleaning machine before use, putting ball milling beads with different diameters into the tank at a ball-material ratio of 8:1, wet-milling by using absolute ethyl alcohol as a medium, setting the rotating speed of the ball mill to be 275r/min, automatically changing the forward and reverse rotating direction every 30 minutes, and stopping rotating for 5 minutes in the middle.
(3) And (3) drying: and pouring the ball-milled flowing slurry into a glass ware, drying for 5 hours at a low vacuum degree of 70 ℃ and then at a high vacuum degree of 110 ℃ until the drying is finished in order to avoid slurry loss or mutual pollution of composite materials caused by boiling of alcohol, and sieving by a 150-mesh sieve after the drying is finished and the temperature is cooled to room temperature.
(4) Molding: and (3) paving the uniformly mixed powder into an inner sleeve of a metal die, keeping the green body prepressing pressure at 10MPa for 20min, adopting a 769YP-30T powder tablet press as a press machine for green body prepressing, adopting an inverted mould-taking mode to ensure the integrity of the green body, sequentially arranging an upper pressure head, a graphite gasket, the green body, the graphite gasket and a lower pressure head from top to bottom, and loading the prepared green body into the graphite die for sintering.
(5) And (3) sintering: putting the graphite mould with the green body into a sintering furnace, carrying out vacuum hot-pressing sintering, setting the initial pressure before sintering to 10MPa according to the influence of volume change on the density, increasing the pressure to 25MPa in the heat preservation stage, completing pressure relief after heat preservation, increasing the temperature rise speed to 1600 ℃ from the room temperature at 45 ℃/min, preserving the heat for 60min, and then cooling along with the furnace to obtain Ti (C, N) toughened TiB2A base ceramic cutting tool material.
Example 4(G4)
A titanium diboride-based composite ceramic cutter mainly comprises the following preparation steps:
(1) weighing: 61% TiB by volume fraction2Powder, 8% Ti (C, N) powder, 23% Al2O3Powder, 5% of Ni powder and 3% of Mo powder.
(2) Ball milling: pouring the proportioned powder into a ball milling tank, cleaning and drying the ball milling tank by using an ultrasonic cleaning machine before use, putting ball milling beads with different diameters into the tank at a ball-material ratio of 8:1, wet-milling by using absolute ethyl alcohol as a medium, setting the rotating speed of the ball mill to be 275r/min, automatically changing the forward and reverse rotating direction every 30 minutes, and stopping rotating for 5 minutes in the middle.
(3) And (3) drying: and pouring the ball-milled flowing slurry into a glass ware, drying for 5 hours at a low vacuum degree of 70 ℃ and then at a high vacuum degree of 110 ℃ until the drying is finished in order to avoid slurry loss or mutual pollution of composite materials caused by boiling of alcohol, and sieving by a 150-mesh sieve after the drying is finished and the temperature is cooled to room temperature.
(4) Molding: and (3) paving the uniformly mixed powder into an inner sleeve of a metal die, keeping the green body prepressing pressure at 10MPa for 20min, adopting a 769YP-30T powder tablet press as a press machine for green body prepressing, adopting an inverted mould-taking mode to ensure the integrity of the green body, sequentially arranging an upper pressure head, a graphite gasket, the green body, the graphite gasket and a lower pressure head from top to bottom, and loading the prepared green body into the graphite die for sintering.
(5) And (3) sintering: putting the graphite mould with the green body into a sintering furnace, carrying out vacuum hot-pressing sintering, setting the initial pressure before sintering to 10MPa according to the influence of volume change on the density, increasing the pressure to 25MPa in the heat preservation stage, completing pressure relief after heat preservation, increasing the temperature rise speed to 1600 ℃ from the room temperature at 45 ℃/min, preserving the heat for 60min, and then cooling along with the furnace to obtain Ti (C, N) toughened TiB2A base ceramic cutting tool material.
Example 5(G5)
A titanium diboride-based composite ceramic cutter mainly comprises the following preparation steps:
(1) weighing: 53% TiB by volume fraction2Powder, 24% Ti (C, N) powder, 7% Al2O3Powder, 10% of Ni powder and 6% of Mo powder.
(2) Ball milling: pouring the proportioned powder into a ball milling tank, cleaning and drying the ball milling tank by using an ultrasonic cleaning machine before use, putting ball milling beads with different diameters into the tank at a ball-material ratio of 8:1, wet-milling by using absolute ethyl alcohol as a medium, setting the rotating speed of the ball mill to be 275r/min, automatically changing the forward and reverse rotating direction every 30 minutes, and stopping rotating for 5 minutes in the middle.
(3) And (3) drying: and pouring the ball-milled flowing slurry into a glass ware, drying for 5 hours at a low vacuum degree of 70 ℃ and then at a high vacuum degree of 110 ℃ until the drying is finished in order to avoid slurry loss or mutual pollution of composite materials caused by boiling of alcohol, and sieving by a 150-mesh sieve after the drying is finished and the temperature is cooled to room temperature.
(4) Molding: and (3) paving the uniformly mixed powder into an inner sleeve of a metal die, keeping the green body prepressing pressure at 10MPa for 20min, adopting a 769YP-30T powder tablet press as a press machine for green body prepressing, adopting an inverted mould-taking mode to ensure the integrity of the green body, sequentially arranging an upper pressure head, a graphite gasket, the green body, the graphite gasket and a lower pressure head from top to bottom, and loading the prepared green body into the graphite die for sintering.
(5) And (3) sintering: putting the graphite mould with the green body into a sintering furnace, carrying out vacuum hot-pressing sintering, setting the initial pressure before sintering to 10MPa in consideration of the influence of volume change on density, increasing the pressure to 25MPa in the heat preservation stage, completing pressure relief after heat preservation, increasing the temperature rise speed to 1500 ℃ from room temperature at 45 ℃/min, preserving heat for 60min, and then cooling along with the furnace to obtain Ti (C, N) toughened TiB2A base ceramic cutting tool material.
Example 6(G6)
A titanium diboride-based composite ceramic cutter mainly comprises the following preparation steps:
(1) weighing: 53% TiB by volume fraction2Powder, 24% Ti (C, N) powder, 7% Al2O3Powder, 10% of Ni powder and 6% of Mo powder.
(2) Ball milling: pouring the proportioned powder into a ball milling tank, cleaning and drying the ball milling tank by using an ultrasonic cleaning machine before use, putting ball milling beads with different diameters into the tank at a ball-material ratio of 8:1, wet-milling by using absolute ethyl alcohol as a medium, setting the rotating speed of the ball mill to be 275r/min, automatically changing the forward and reverse rotating direction every 30 minutes, and stopping rotating for 5 minutes in the middle.
(3) And (3) drying: and pouring the ball-milled flowing slurry into a glass ware, drying for 5 hours at a low vacuum degree of 70 ℃ and then at a high vacuum degree of 110 ℃ until the drying is finished in order to avoid slurry loss or mutual pollution of composite materials caused by boiling of alcohol, and sieving by a 150-mesh sieve after the drying is finished and the temperature is cooled to room temperature.
(4) Molding: and (3) paving the uniformly mixed powder into an inner sleeve of a metal die, keeping the green body prepressing pressure at 10MPa for 20min, adopting a 769YP-30T powder tablet press as a press machine for green body prepressing, adopting an inverted mould-taking mode to ensure the integrity of the green body, sequentially arranging an upper pressure head, a graphite gasket, the green body, the graphite gasket and a lower pressure head from top to bottom, and loading the prepared green body into the graphite die for sintering.
(5) And (3) sintering: putting the graphite mold with the green body into a sintering furnace, performing vacuum hot-pressing sintering, setting the initial pressure before sintering to 10MPa according to the influence of volume change on the density, increasing the pressure to 25MPa in the heat preservation stage, completing pressure relief after heat preservation, increasing the temperature rise speed to 1550 ℃ from the room temperature at 45 ℃/min, preserving the heat for 60min, and then cooling along with the furnace to obtain Ti (C, N) toughened TiB2A base ceramic cutting tool material.
Example 7(G7)
A titanium diboride-based composite ceramic cutter mainly comprises the following preparation steps:
(1) weighing: 53% TiB by volume fraction2Powder, 24% Ti (C, N) powder, 7% Al2O3Powder, 10% of Ni powder and 6% of Mo powder.
(2) Ball milling: pouring the proportioned powder into a ball milling tank, cleaning and drying the ball milling tank by using an ultrasonic cleaning machine before use, putting ball milling beads with different diameters into the tank at a ball-material ratio of 8:1, wet-milling by using absolute ethyl alcohol as a medium, setting the rotating speed of the ball mill to be 275r/min, automatically changing the forward and reverse rotating direction every 30 minutes, and stopping rotating for 5 minutes in the middle.
(3) And (3) drying: and pouring the ball-milled flowing slurry into a glass ware, drying for 5 hours at a low vacuum degree of 70 ℃ and then at a high vacuum degree of 110 ℃ until the drying is finished in order to avoid slurry loss or mutual pollution of composite materials caused by boiling of alcohol, and sieving by a 150-mesh sieve after the drying is finished and the temperature is cooled to room temperature.
(4) Molding: and (3) paving the uniformly mixed powder into an inner sleeve of a metal die, keeping the green body prepressing pressure at 10MPa for 20min, adopting a 769YP-30T powder tablet press as a press machine for green body prepressing, adopting an inverted mould-taking mode to ensure the integrity of the green body, sequentially arranging an upper pressure head, a graphite gasket, the green body, the graphite gasket and a lower pressure head from top to bottom, and loading the prepared green body into the graphite die for sintering.
(5) And (3) sintering: putting the graphite mould with the green body into a sintering furnace, carrying out vacuum hot-pressing sintering, setting the initial pressure before sintering to 10MPa according to the influence of volume change on the density, increasing the pressure to 25MPa in the heat preservation stage, completing pressure relief after heat preservation, increasing the temperature rise speed to 1600 ℃ from the room temperature at 45 ℃/min, preserving the heat for 60min, and then cooling along with the furnace to obtain Ti (C, N) toughened TiB2A base ceramic cutting tool material.
Example 8(G8)
A titanium diboride-based composite ceramic cutter mainly comprises the following preparation steps:
(1) weighing: 53% TiB by volume fraction2Powder, 24% Ti (C, N) powder, 7% Al2O3Powder, 10% of Ni powder and 6% of Mo powder.
(2) Ball milling: pouring the proportioned powder into a ball milling tank, cleaning and drying the ball milling tank by using an ultrasonic cleaning machine before use, putting ball milling beads with different diameters into the tank at a ball-material ratio of 8:1, wet-milling by using absolute ethyl alcohol as a medium, setting the rotating speed of the ball mill to be 275r/min, automatically changing the forward and reverse rotating direction every 30 minutes, and stopping rotating for 5 minutes in the middle.
(3) And (3) drying: and pouring the ball-milled flowing slurry into a glass ware, drying for 5 hours at a low vacuum degree of 70 ℃ and then at a high vacuum degree of 110 ℃ until the drying is finished in order to avoid slurry loss or mutual pollution of composite materials caused by boiling of alcohol, and sieving by a 150-mesh sieve after the drying is finished and the temperature is cooled to room temperature.
(4) Molding: and (3) paving the uniformly mixed powder into an inner sleeve of a metal die, keeping the green body prepressing pressure at 10MPa for 20min, adopting a 769YP-30T powder tablet press as a press machine for green body prepressing, adopting an inverted mould-taking mode to ensure the integrity of the green body, sequentially arranging an upper pressure head, a graphite gasket, the green body, the graphite gasket and a lower pressure head from top to bottom, and loading the prepared green body into the graphite die for sintering.
(5) And (3) sintering: putting the graphite mould with the green body into a sintering furnace for vacuum hot-pressing sinteringFinally, the vacuum degree in the furnace is required to be lower than 0.01MPa, the influence of volume change on the compactness is considered, the initial pressure before sintering is set to be 10MPa, the pressure is increased to 25MPa in the heat preservation stage, the pressure relief is completed after heat preservation, the temperature rise speed is 45 ℃/min, the temperature reaches 1650 ℃ from the room temperature, the temperature is preserved for 60min, and then the temperature is cooled along with the furnace, so that the Ti (C, N) toughened TiB is obtained2A base ceramic cutting tool material.
The mechanical properties of examples 1-4 are shown in FIG. 1. With Al2O3The content is increased from 0 percent to 23 percent, the bending strength of the material is increased from 698MPa to 779MPa and then is reduced to 600MPa, and the fracture toughness is increased from 5.19 MPa-m1/2Increased to 8.81 MPa-m1/2Then the pressure is reduced to 7.4 MPa.m1/2The Vickers hardness is increased after being slightly decreased. It should be noted that Al of the G1-G4 composite material2O3The content of the inorganic acid is 7 vol% and the inorganic acid has the best mechanical property.
The mechanical properties of examples 5-8 are shown in FIG. 2. The sintering temperature is increased from 1500 ℃ to 1600 ℃, the bending strength of the composite material is increased from 765MPa to 806MPa, and the fracture toughness is increased from 7.71 MPa.m1/2Down to 7.288MPa m1/2The Vickers hardness gradually increased, but at 1650 ℃ the flexural strength rapidly decreased to 730MPa and the fracture toughness increased to 8.77MPa m1 /2。
The ceramic cutter prepared by the invention has good bending strength and fracture toughness, can meet the performance requirements of high-speed cutting of nickel-based high-temperature alloy on the ceramic cutter, and is beneficial to further expanding the application range of the ceramic cutter.
The above description is only a preferred embodiment of the present disclosure, and is not intended to limit the present disclosure, and various changes may be made within the knowledge of those skilled in the art without departing from the spirit of the present invention.

Claims (5)

1. TiB2/Ti(C,N)/Al2O3The preparation method of the ceramic cutter material is characterized by comprising the following preparation processes:
(1) the powder is prepared according to the mass ratio, and then is ball-milled in a ball mill by taking absolute ethyl alcohol as a ball-milling medium, wherein the ball-milling tank and the ball-milling material are all stainless steel.
(2) Pouring the ball-milled flowing slurry into a glass ware, and putting the glass ware into a DZ-1BC II vacuum drying oven for heating and drying.
(3) After drying, cooling to room temperature and sieving with a 150-mesh sieve.
(4) And spreading the uniformly mixed powder into an inner sleeve of the metal mold.
(5) A press machine 769YP-30T powder tablet press machine is used for green body prepressing, an upper pressure head-graphite gasket-green body-graphite gasket-lower pressure head is sequentially arranged from top to bottom in an inverted mould taking mode for ensuring the integrity of the green body, and the manufactured green body is loaded into a graphite mould for sintering.
2. The preparation step of claim 1, wherein in the step (1), the ball is milled in the ball mill for 48 hours at a ball-to-material ratio of 8:1, the ball mill is set to rotate at 275r/min, the forward and reverse rotation directions are automatically changed every 30 minutes, and the rotation is stopped for 5 minutes.
3. The preparation method according to claim 1, wherein in the step (1), the material comprises the following components in parts by mass: titanium diboride (TiB)2) 53-61%, titanium carbonitride (Ti (C, N)): 8-31%, alumina (Al)2O3) 0-23%, nickel (Ni) 5-10%, molybdenum (Mo): 3 to 6 percent.
4. The preparation process according to claim 1, wherein in the step (2), in order to prevent the loss of the slurry or the mutual contamination of the composite materials due to the boiling of the alcohol, the drying is performed for 5 hours at a low vacuum degree of 70 ℃ and then at a high vacuum degree of 110 ℃ until the drying is completed.
5. The method of claim 1, wherein in step (5), the green body pre-compaction pressure is 10MPa and the time is 20 min.
CN202011114714.7A 2020-10-16 2020-10-16 TiB2/Ti(C,N)/Al2O3Preparation method of ceramic cutter material Pending CN112430761A (en)

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