CN115927895A - Isolated island structure TiB 2 Cu-Cu composite material and preparation method thereof - Google Patents
Isolated island structure TiB 2 Cu-Cu composite material and preparation method thereof Download PDFInfo
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Abstract
The invention discloses an isolated island-shaped structure TiB 2 The preparation method of the/Cu-Cu composite material specifically comprises the following steps: step 1: first according to TiB in the composite material 2 Particle pre-formation amount for Cu powder and TiH 2 The powder and the powder B are proportioned and weighed, and then are subjected to mechanical alloying treatment by a ball mill to prepare spherical Cu + TiH 2 + B precursor powder; step 2: spherical Cu + TiH through vibration powder mixing equipment 2 Mixing the precursor powder B and the pure Cu powder in proportion; and 3, step 3: performing cold press molding on the fully and uniformly mixed powder obtained in the step 2 to obtain a cold pressed blank; and 4, step 4: placing the pressed compact in a graphite die for hot-pressing sintering to prepare the TiB with the isolated island-shaped structure 2 a/Cu-Cu composite material. The method solves the problem of TiB 2 The plasticity/toughness of the particle dispersion reinforced Cu-based composite material is poor. Also discloses an isolated island-shaped structure TiB 2 a/Cu-Cu composite material.
Description
Technical Field
The invention belongs to the technical field of metal matrix composite materials, and particularly relates to an isolated island-shaped TiB structure 2 a/Cu-Cu composite material and an isolated island-shaped structure TiB 2 A preparation method of a/Cu-Cu composite material.
Background
The discontinuous particle reinforced metal matrix composite material has become an indispensable lightweight structural material and functional material in high-tech fields such as military and national defense, aerospace, rail transit and the like due to the advantages in various aspects such as cost, mechanical property, specific strength, thermal stability, isotropy, machining and the like. However, although these metal matrix composites have many favorable properties of high electrical conductivity, high thermal stability and high strength, the room temperature damage tolerance (toughness, ductility and defect sensitivity) of the materials is greatly reduced due to the addition of a large amount of discontinuous brittle ceramic particles in the matrix, so that they cannot be widely used. Currently, the focus of attention in this field is to control the volume fraction, size and aspect ratio of the reinforcement in the metal matrix to obtain a metal matrix composite material with the reinforcement uniformly dispersed. But theoretical analysisAnd the research results carried out show that the configuration design of the non-uniform distribution of the reinforcement in the matrix is expected to break the bottleneck of poor damage tolerance of materials. In recent years, tiB 2 The particle reinforced Cu-based composite material is used as a preferred material of a high-strength high-conductivity metal structure component, and the limitation of the improvement of the comprehensive performance caused by the dispersion distribution of the reinforcement body also becomes a key problem to be solved in the field.
Disclosure of Invention
It is a first object of the present invention to provide an isolated island structure TiB 2 The preparation method of the/Cu-Cu composite material solves the problem of TiB 2 The problem of poor plasticity/toughness of the particle dispersion reinforced Cu-based composite material is solved, and TiB is realized 2 The comprehensive performance of the/Cu composite material is further improved.
It is a second object of the present invention to provide an isolated island-like structure TiB 2 a/Cu-Cu composite material, which solves the problem of TiB 2 The plasticity/toughness of the particle dispersion reinforced Cu-based composite material is poor.
The first technical scheme adopted by the invention is that the isolated island-shaped structure TiB 2 The preparation method of the/Cu-Cu composite material comprises the following steps:
step 1: firstly according to the TiB in the composite material 2 Particle pre-generation amount to Cu powder and TiH 2 The powder and the B powder are proportioned and weighed, and then are subjected to mechanical alloying treatment by a ball mill to prepare spherical Cu + TiH 2 + B precursor powder;
step 2: spherical Cu + TiH through vibration powder mixing equipment 2 Mixing the precursor powder B and the pure Cu powder in proportion;
and 3, step 3: performing cold press molding on the fully and uniformly mixed powder obtained in the step 2 to obtain a cold pressed blank;
and 4, step 4: placing the pressed compact in a graphite die for hot-pressing sintering to prepare an isolated island-shaped structure TiB 2 a/Cu-Cu composite material.
The present invention is also characterized in that,
the specific implementation mode of the step 1 is as follows:
firstly, according to the molar ratio of Ti atoms to B atoms of 1:2 to TiH 2 Powders andb powder is subjected to proportion calculation and combined with in-situ generation of TiB 2 The particle content is Cu + TiH 2 1-5 wt.% of the precursor powder of + B Cu powder and TiH powder are weighed respectively 2 The method comprises the following steps of (1) pouring three raw material powders into the same ball milling tank, weighing the ball milling beads according to the mass of the powders in the ball milling tank in a ball material ratio of (10-20) -2 Filling argon gas to low negative pressure after Pa, and repeating for multiple times to ensure that the inside of the ball milling tank is completely protected by argon gas atmosphere; finally, the ball milling tank is placed in a ball mill for ball milling treatment with the rotating speed of 350r/min-450r/min and the ball milling time of 5h-20h to obtain the spherical Cu + TiH 2 + B precursor powder.
In step 1, spherical Cu + TiH 2 The particle size range of the precursor powder of + B is 200-900 μm.
In step 2, spherical Cu + TiH 2 The mass ratio of the precursor powder B to the pure Cu powder is 4:1-1:4 for vibration powder mixing to obtain spherical Cu + TiH 2 And the mixed powder of the precursor powder and the pure Cu powder, wherein the frequency of the vibration mixed powder is 30Hz-50Hz, and the vibration duration is 1h-3h.
The specific implementation manner of the step 3 is as follows:
and (3) weighing the mixed powder obtained in the step (2), placing the mixed powder into a quenching steel cold pressing die, and carrying out cold press molding on the mixed powder by a four-column hydraulic press under the loading pressure of 50-200 MPa and the pressure maintaining time of 20-60 s so as to obtain a cold pressed blank with higher density.
The specific implementation manner of the step 4 is as follows:
putting the cold pressed blank into a graphite crucible and putting the cold pressed blank into the center position in a sintering furnace, closing a furnace cover of the hot pressing furnace, and sintering under the protection of inert gas or vacuum; wherein, the sintering process firstly heats up to 850-950 ℃ at the speed of 10-30 ℃/min and keeps the temperature for 0.5-1 h, then continuously heats up to 950-1060 ℃ and keeps the temperature for 0.5-2 h under the pressure of 0-50 MPa, and then cools down to room temperature along with the furnace to prepare the TiB with the isolated island structure 2 a/Cu-Cu composite material.
The second technical scheme adopted by the invention is that the isolated island-shaped structure TiB 2 the/Cu-Cu composite material is prepared by the method.
The invention has the beneficial effects that:
the invention relates to a method for preparing an isolated island-shaped structure TiB 2 Method for producing a Cu-Cu composite material, the macroscopic structure of which is TiB 2 the/Cu composite region is an isolated island-shaped structure wrapped by the pure Cu region, and the pure Cu region is in a space communication state. This isolated island structure TiB 2 the/Cu composite material not only shows excellent cold processing deformability, but also solves the problem of TiB 2 The problem of poor plasticity/toughness of the particle dispersion reinforced Cu-based composite material is solved, and the TiB is obviously improved 2 Mechanical property and conductivity of the/Cu composite material.
Drawings
FIG. 1 shows the spherical Cu + TiH after ball milling in example 1 of the present invention 2 + B precursor powder morphology;
FIG. 2 shows an isolated island-like TiB structure prepared in example 1 of the present invention 2 The sintered morphology of the/Cu-Cu composite material;
FIG. 3 shows that in example 2 of the present invention, an isolated island-like TiB structure is obtained 2 The sintered morphology of the/Cu-Cu composite material;
FIG. 4 shows that the isolated island-like TiB structure is obtained in example 2 of the present invention 2 The texture appearance of the sintered composite area of the/Cu-Cu composite material;
FIG. 5 shows that in example 3 of the present invention, an isolated island-like TiB structure is obtained 2 The rolling state appearance of the/Cu-Cu composite material.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The invention provides a method for preparing an isolated island-shaped structure TiB 2 The preparation method of the/Cu-Cu composite material specifically comprises the following steps:
step 1: first according to TiB in the composite material 2 Particle pre-formation amount for Cu powder and TiH 2 The powder and the B powder are proportioned and weighed, and then are subjected to mechanical alloying treatment by a ball mill to prepare spherical Cu + TiH 2 + B precursor powder;
the specific implementation mode of the step 1 is as follows:
firstly, according to the molar ratio of Ti atoms to B atoms of 1:2 to TiH 2 The powder and the powder B are calculated according to the proportion and combined with the in-situ generation of TiB 2 The particle content is Cu + TiH 2 1-5 wt.% of the precursor powder of + B Cu powder and TiH powder are weighed respectively 2 And powder B, then, the three raw material powders are simultaneously inverted into the same ball milling tank, the ball milling beads are weighed according to the mass of the powder in the ball milling tank in a ball-material ratio of 10 to 1 -2 Filling argon gas to low negative pressure after Pa, and repeating for multiple times to ensure that the inside of the ball milling tank is completely protected by argon gas atmosphere; finally, the ball milling tank is placed in a ball mill for ball milling treatment with the rotating speed of 350r/min-450r/min and the ball milling time of 5h-20h to obtain the spherical Cu + TiH 2 + B precursor powder. In step 1, spherical Cu + TiH 2 The particle size range of the precursor powder of + B is 200-900 μm.
Step 2: spherical Cu + TiH is mixed through vibration powder mixing equipment 2 Mixing the precursor powder B and the pure Cu powder in proportion;
in step 2, spherical Cu + TiH 2 The mass ratio of the precursor powder B to the pure Cu powder is 4:1-1:4, and three-dimensional vibration powder mixing is carried out to obtain spherical Cu + TiH 2 And the mixed powder of the precursor powder and the pure Cu powder, wherein the frequency of the vibration mixed powder is 30Hz-50Hz, and the vibration duration is 1h-3h. And step 3: performing cold press molding on the fully and uniformly mixed powder obtained in the step 2 to obtain a cold pressed blank;
the specific implementation mode of the step 3 is as follows:
and (3) weighing the mixed powder obtained in the step (2), placing the mixed powder into a quenching steel cold pressing die, and carrying out cold press molding on the mixed powder by a four-column hydraulic press under the loading pressure of 50-200 MPa and the pressure maintaining time of 20-60 s so as to obtain a cold pressed blank with higher density.
And 4, step 4: placing the pressed compact in a graphite die for hot-pressing sintering to prepare the TiB with the isolated island-shaped structure 2 a/Cu-Cu composite material.
The specific implementation manner of the step 4 is as follows:
putting the cold pressed blank into a graphite crucible and putting the cold pressed blank into the center position in a sintering furnace, closing a furnace cover of the hot pressing furnace, and sintering under the inert gas protection or vacuum atmosphere; wherein, the sintering process firstly heats up to 850-950 ℃ at the speed of 10-30 ℃/min and keeps the temperature for 0.5-1 h, then continuously heats up to 950-1060 ℃ and keeps the temperature for 0.5-2 h under the pressure of 0-50 MPa, and then cools down to room temperature along with the furnace to prepare the TiB with the isolated island structure 2 a/Cu-Cu composite material.
Example 1
Step 1: mixing Cu powder and TiH 2 The powder and the powder B are generated into TiB according to the in-situ reaction 2 The content of the particles accounts for 2wt.% of the matrix of the precursor powder, and then Cu powder and TiH are used for proportioning 2 Weighing 29.4g, 0.43g and 0.19g of powder B, pouring the three raw material powders into the same ball milling tank, respectively adding the powder B, the ball milling beads and absolute ethyl alcohol into the same ball milling tank, and vacuumizing to 1.0 × 10 -2 And (2) introducing argon gas to low negative pressure after Pa, repeating the steps for a plurality of times to ensure that the interior of the ball milling tank is completely protected by argon gas atmosphere, then placing the ball milling tank in a ball milling machine for ball milling treatment at 450r/min for 8h, wherein the mass of grinding balls is 15 times of the mass of powder in the ball milling tank, the addition of absolute ethyl alcohol of a process control agent is 3wt.%, and finally obtaining spherical Cu + TiH 2 + B precursor powder.
Step 2: spherical precursor powder and pure Cu powder are respectively weighed according to the weight ratio of 2:3 and are placed in a powder mixing tank to be subjected to vibration powder mixing with the frequency of 40Hz and the time of 1h, and uniform mixed powder of the spherical precursor powder and the pure Cu powder is obtained.
And 3, step 3: and (3) weighing the mixed powder obtained in the step (2), placing the mixed powder into a quenching steel cold pressing die, and carrying out cold press molding on the mixed powder by a four-column hydraulic press under the loading pressure of 100MPa and the pressure maintaining for 40s to obtain a cold pressed blank with higher density.
And 4, step 4: and (3) putting the cold-pressed blank into a graphite crucible and putting the cold-pressed blank into the center position in a sintering furnace, closing the furnace cover of the hot-pressing furnace, and sintering under the protection of nitrogen. Wherein, sinteringThe process comprises the steps of firstly heating to 900 ℃ at the speed of 20 ℃/min and preserving heat for 0.5h, then continuously heating to 1000 ℃ and preserving heat for 1h under the pressure of 35MPa, and finally cooling to room temperature along with a furnace to obtain the isolated island-shaped structure TiB 2 A Cu-Cu composite material.
Through the above process, the isolated island-shaped TiB prepared in this example is formed 2 The as-sintered conductivity of the/Cu-Cu composite was 93% IACS, the tensile elongation at break was 34%, and the room-temperature rolling deformation was 90%.
As shown in FIG. 1, the spherical Cu + TiH of the ball-milled product of example 1 2 The precursor powder is similar to a sphere in shape, and the sphericity is higher.
As shown in FIG. 2, the isolated island-like structure TiB prepared in example 1 2 The sintered morphology of the/Cu-Cu composite material shows that TiB 2 the/Cu composite regions are distributed in isolated island-shaped in the matrix, and two adjacent TiB 2 The space between the/Cu composite regions is larger, and the pure Cu regions are in a space communication state, so that the isolated island-shaped structure TiB 2 the/Cu composite material not only shows excellent cold processing deformability, but also solves the problem of TiB 2 The problem of poor plasticity/toughness of the particle dispersion reinforced Cu-based composite material is solved, and the TiB is obviously improved 2 The mechanical property and the conductivity of the/Cu composite material.
Example 2
Step 1: mixing Cu powder and TiH 2 The powder and the B powder generate TiB according to in-situ reaction 2 The content of the particles accounts for 2wt.% of the matrix of the precursor powder, and then Cu powder and TiH are used 2 Weighing 29.4g, 0.43g and 0.19g of powder B, pouring the three raw material powders into the same ball milling tank, adding the three raw material powders together with ball milling beads and absolute ethyl alcohol into the same ball milling tank, and vacuumizing to 1.0X 10 -2 And (2) introducing argon gas to low negative pressure after Pa, repeating the steps for multiple times to ensure that the interior of the ball milling tank is completely protected by argon gas atmosphere, then placing the ball milling tank in a ball milling machine for ball milling treatment at 450r/min for 10 hours, wherein the mass of grinding balls is 20 times of the mass of powder in the ball milling tank, the addition amount of absolute ethyl alcohol of a process control agent is 2wt.%, and finally obtaining spherical Cu + TiH 2 + B precursor powder.
Step 2: spherical precursor powder and pure Cu powder are respectively weighed according to the weight ratio of 3:2 and are placed in a powder mixing tank to be subjected to vibration powder mixing with the frequency of 40Hz and the time of 1h, and uniform mixed powder of the spherical precursor powder and the pure Cu powder is obtained.
And step 3: and (3) weighing the mixed powder obtained in the step (2), placing the mixed powder into a quenching steel cold pressing die, and carrying out cold press molding on the mixed powder by a four-column hydraulic press under the loading pressure of 100MPa and the pressure maintaining for 40s to obtain a cold pressed blank with higher density.
And 4, step 4: and (3) putting the cold-pressed blank into a graphite crucible and putting the cold-pressed blank into the center position in a sintering furnace, closing the furnace cover of the hot-pressing furnace, and sintering under the protection of nitrogen. Wherein, the sintering process firstly heats up to 900 ℃ at the speed of 20 ℃/min and preserves the temperature for 0.5h, then continuously heats up to 1050 ℃ and preserves the temperature for 1h under the pressure of 35MPa, and finally cools down to room temperature along with the furnace to prepare the isolated island-shaped structure TiB 2 A Cu-Cu composite material.
Through the above process, the isolated island-shaped TiB prepared in this example is formed 2 The as-sintered conductivity of the/Cu-Cu composite was 88% IACS, the tensile elongation at break was 31%, and the room-temperature rolling deformation was 70%.
As shown in FIG. 3, the isolated island-like structure TiB prepared in example 2 2 The sintered morphology of the/Cu-Cu composite material can be seen as TiB 2 the/Cu composite regions are distributed in isolated island-shaped in the matrix, and two adjacent TiB 2 The space between the/Cu composite regions is small, and the pure Cu regions are in a space communication state, so that the isolated island-shaped structure TiB 2 the/Cu composite material not only shows excellent cold processing deformability, but also solves the problem of TiB 2 The problem of poor plasticity/toughness of the particle dispersion reinforced Cu-based composite material is solved, and the TiB is obviously improved 2 The mechanical property and the conductivity of the/Cu composite material.
As shown in FIG. 4, the isolated island-like structure TiB prepared in example 2 2 The appearance of a composite region in a sintered matrix of the/Cu-Cu composite material is visible, and the TiB is fine 2 The particles are dispersed in the composite zone.
Example 3
Step 1: mixing Cu powder and TiH 2 The powder and the powder B are generated into TiB according to the in-situ reaction 2 The content of the particles accounts for 2wt.% of the matrix of the precursor powder, and then Cu powder and TiH are used 2 Weighing 29.4g, 0.43g and 0.19g of powder B, pouring the three raw material powders into the same ball milling tank, respectively adding the powder B, the ball milling beads and absolute ethyl alcohol into the same ball milling tank, and vacuumizing to 1.0 × 10 -2 And (3) introducing argon gas to low negative pressure after Pa, repeating for multiple times to ensure that the inside of the ball milling tank is completely protected by argon gas atmosphere, then placing the ball milling tank in a ball milling machine for ball milling treatment at 400r/min for 10 hours, wherein the mass of grinding balls is 20 times of the mass of powder in the ball milling tank, the addition of a process control agent absolute ethyl alcohol is 3wt.%, and finally obtaining spherical Cu + TiH 2 + B precursor powder.
Step 2: spherical precursor powder and pure Cu powder are respectively weighed according to the weight ratio of 1:1 and are placed in a powder mixing tank to be subjected to vibration powder mixing with the frequency of 40Hz and the time of 1h, and uniform mixed powder of the spherical precursor powder and the pure Cu powder is obtained.
And step 3: and (3) weighing the mixed powder obtained in the step (2), placing the mixed powder into a quenching steel cold pressing die, and carrying out cold press molding on the mixed powder by a four-column hydraulic press under the loading pressure of 100MPa and the pressure maintaining for 40s to obtain a cold pressed blank with higher density.
And 4, step 4: and (3) putting the cold-pressed blank into a graphite crucible and putting the cold-pressed blank into the center position in a sintering furnace, closing the furnace cover of the hot-pressing furnace, and sintering under the protection of nitrogen. Wherein, the sintering process firstly heats up to 900 ℃ at the speed of 20 ℃/min and preserves heat for 0.5h, then continuously heats up to 1020 ℃ and preserves heat for 1h under the pressure of 35MPa, and finally cools down to room temperature along with the furnace to prepare the TiB with the isolated island structure 2 a/Cu-Cu composite material.
Through the above process, the isolated island-shaped TiB prepared in this example is formed 2 The as-sintered conductivity of the/Cu-Cu composite was 90% IACS, the tensile elongation at break was 32%, and the room-temperature rolling deformation was 80%.
As shown in FIG. 5, the isolated island-like structure TiB prepared in example 3 2 Rolled form of/Cu-Cu composite materialOutward appearance, visible TiB 2 the/Cu composite region is still distributed in an isolated strip-shaped island shape in the matrix, and the pure Cu region is in a space communication shape, so that the isolated island-shaped structure TiB 2 the/Cu composite material not only shows excellent cold-working deformability, but also solves the problem of TiB 2 The problem of poor plasticity/toughness of the particle dispersion reinforced Cu-based composite material is solved, and the TiB is obviously improved 2 The mechanical property and the conductivity of the/Cu composite material.
Example 4
Step 1: mixing Cu powder and TiH 2 The powder and the powder B are generated into TiB according to the in-situ reaction 2 The content of the particles accounts for 3wt.% of the matrix of the precursor powder, and then Cu powder and TiH are used for proportioning 2 Weighing 29.1g, 0.64g and 0.28g of powder B, pouring the three raw material powders into the same ball milling tank, respectively adding the powders, ball milling beads and absolute ethyl alcohol into the same ball milling tank, and vacuumizing to 1.0 × 10 -2 And (2) introducing argon gas to low negative pressure after Pa, repeating the steps for multiple times to ensure that the interior of the ball milling tank is completely protected by argon gas atmosphere, then placing the ball milling tank in a ball milling machine for ball milling treatment at 450r/min for 10 hours, wherein the mass of grinding balls is 15 times of the mass of powder in the ball milling tank, the addition amount of absolute ethyl alcohol of a process control agent is 3wt.%, and finally obtaining spherical Cu + TiH 2 + B precursor powder.
Step 2: spherical precursor powder and pure Cu powder are respectively weighed according to the weight ratio of 2:3 and are placed in a powder mixing tank to be subjected to vibration powder mixing with the frequency of 40Hz and the time of 1h, and uniform mixed powder of the spherical precursor powder and the pure Cu powder is obtained.
And 3, step 3: and (3) weighing the mixed powder obtained in the step (2), placing the mixed powder into a quenching steel cold pressing die, and carrying out cold press molding on the mixed powder by a four-column hydraulic press under the loading pressure of 100MPa and the pressure maintaining for 60s to obtain a cold pressed blank with higher density.
And 4, step 4: and (3) putting the cold-pressed blank into a graphite crucible and putting the cold-pressed blank into the center position in a sintering furnace, closing the furnace cover of the hot-pressing furnace, and sintering under the protection of nitrogen. Wherein, the sintering process is firstly heated to 900 ℃ at the speed of 20 ℃/min and is kept for 0.5h, and then the temperature is continuously heated to 1040 ℃ and is kept at the pressure of 35MPaPreserving heat for 1h, and finally cooling to room temperature along with the furnace to obtain the isolated island-shaped structure TiB 2 a/Cu-Cu composite material.
Through the above process, the isolated island-shaped TiB prepared in this example is formed 2 The as-sintered conductivity of the/Cu-Cu composite was 91% IACS, the tensile elongation at break was 32.4%, and the room-temperature rolling deformation was 80%.
Example 5
Step 1: mixing Cu powder and TiH 2 The powder and the B powder generate TiB according to in-situ reaction 2 The content of the particles accounts for 3wt.% of the matrix of the precursor powder, and then Cu powder and TiH are used for proportioning 2 Weighing 29.1g, 0.64g and 0.28g of powder B, pouring the three raw material powders into the same ball milling tank, respectively adding the powders, ball milling beads and absolute ethyl alcohol into the same ball milling tank, and vacuumizing to 1.0 × 10 -2 And Pa, filling argon to low negative pressure, repeating for multiple times to ensure that the inside of the ball milling tank is completely protected by argon atmosphere, then placing the ball milling tank in a ball milling machine for ball milling treatment at 400r/min for 8 hours, wherein the mass of grinding balls is 15 times of the mass of powder in the ball milling tank, the addition of a process control agent absolute ethyl alcohol is 3wt.%, and finally obtaining spherical Cu + TiH 2 + B precursor powder.
Step 2: spherical precursor powder and pure Cu powder are respectively weighed according to the weight ratio of 3:2 and are placed in a powder mixing tank to be subjected to vibration powder mixing with the frequency of 50Hz and the time length of 2h, and uniform mixed powder of the spherical precursor powder and the pure Cu powder is obtained.
And step 3: and (3) weighing the mixed powder obtained in the step (2), placing the mixed powder into a quenching steel cold pressing die, and carrying out cold press molding on the mixed powder under the loading pressure of 150MPa and the pressure maintaining for 60s by using a four-column hydraulic press so as to obtain a cold pressed blank with higher density.
And 4, step 4: and (3) putting the cold pressed blank into a graphite crucible and putting the cold pressed blank into the center position inside a sintering furnace, closing a furnace cover of the hot pressing furnace, and sintering under the protection of nitrogen. Wherein, the sintering process is firstly heated to 900 ℃ at the speed of 25 ℃/min and is kept for 1h, then is continuously heated to 1040 ℃ and is kept for 1h under the pressure of 35MPa, and finally is cooled to the room temperature along with the furnace to prepare the ceramic materialObtaining an isolated island-shaped structure TiB 2 A Cu-Cu composite material.
Through the process, the isolated island-shaped structure TiB prepared by the embodiment 2 The as-sintered conductivity of the/Cu-Cu composite was 87% IACS, the tensile elongation at break was 29%, and the room-temperature rolling deformation was 70%.
Claims (7)
1. Isolated island-like structure TiB 2 The preparation method of the/Cu-Cu composite material is characterized by comprising the following steps:
step 1: first according to TiB in the composite material 2 Particle pre-generation amount to Cu powder and TiH 2 The powder and the B powder are proportioned and weighed, and then are subjected to mechanical alloying treatment by a ball mill to prepare spherical Cu + TiH 2 + B precursor powder;
step 2: spherical Cu + TiH through vibration powder mixing equipment 2 Mixing the precursor powder B and the pure Cu powder in proportion;
and step 3: performing cold press molding on the fully and uniformly mixed powder obtained in the step 2 to obtain a cold pressed blank;
and 4, step 4: placing the pressed compact in a graphite die for hot-pressing sintering to prepare the TiB with the isolated island-shaped structure 2 a/Cu-Cu composite material.
2. The isolated island structure TiB of claim 1 2 The preparation method of the/Cu-Cu composite material is characterized in that the specific implementation mode of the step 1 is as follows:
firstly, according to the molar ratio of Ti atoms to B atoms of 1:2 to TiH 2 The powder and the powder B are subjected to proportion calculation and combined with in-situ generation of TiB 2 The particle content is Cu + TiH 2 1-5 wt.% of the precursor powder of + B Cu powder and TiH powder are weighed respectively 2 The method comprises the following steps of (1) pouring three raw material powders into the same ball milling tank, weighing the ball milling beads according to the mass of the powders in the ball milling tank in a ball material ratio of (10-20) -2 Filling argon to low negative pressure after Pa,repeating the steps for multiple times to ensure that the inside of the ball milling tank is completely protected by argon atmosphere; finally, the ball milling tank is placed in a ball mill for ball milling treatment with the rotating speed of 350r/min-450r/min and the ball milling time of 5h-20h to obtain the spherical Cu + TiH 2 + B precursor powder.
3. The isolated island structure TiB of claim 1 2 The preparation method of the/Cu-Cu composite material is characterized in that in the step 1, spherical Cu + TiH 2 The particle size range of the precursor powder of + B is 200-900 μm.
4. The isolated island structure TiB of claim 1 2 The preparation method of the/Cu-Cu composite material is characterized in that in the step 2, spherical Cu + TiH 2 + B precursor powder and pure Cu powder are subjected to three-dimensional vibration powder mixing according to the mass ratio of 4:1-1:4 to obtain spherical Cu + TiH 2 And + B precursor powder and pure Cu powder, wherein the frequency of the vibration mixed powder is 30Hz-50Hz, and the vibration duration is 1h-3h.
5. The isolated island structure TiB of claim 1 2 The preparation method of the/Cu-Cu composite material is characterized in that the specific implementation mode of the step 3 is as follows:
and (3) weighing the mixed powder obtained in the step (2), placing the mixed powder into a quenching steel cold pressing die, and carrying out cold press molding on the mixed powder by a four-column hydraulic press under the loading pressure of 50-200 MPa and the pressure maintaining time of 20-60 s so as to obtain a cold pressed blank with higher density.
6. The isolated island structure TiB of claim 1 2 The preparation method of the/Cu-Cu composite material is characterized in that the specific implementation mode of the step 4 is as follows:
putting the cold pressed blank into a graphite crucible and putting the cold pressed blank into the center position in a sintering furnace, closing a furnace cover of the hot pressing furnace, and sintering under the inert gas protection or vacuum atmosphere; wherein, the sintering process firstly heats up to 850-950 ℃ at the speed of 10-30 ℃/min and keeps the temperature for 0.5-1 h, then continuously heats up to 950-1060 ℃ and keeps the temperature at the pressure of 0-50 MPaKeeping the temperature for 0.5 to 2 hours under the action of force, and then cooling the temperature to room temperature along with a furnace to obtain the TiB with the isolated island structure 2 A Cu-Cu composite material.
7. Isolated island-like structure TiB 2 A/Cu-Cu composite material, characterized in that it is produced by a method according to any one of claims 1 to 6.
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