CN112359297A - Short carbon fiber reinforced Ti2Preparation method of AlNb composite material - Google Patents

Short carbon fiber reinforced Ti2Preparation method of AlNb composite material Download PDF

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Publication number
CN112359297A
CN112359297A CN202010644321.0A CN202010644321A CN112359297A CN 112359297 A CN112359297 A CN 112359297A CN 202010644321 A CN202010644321 A CN 202010644321A CN 112359297 A CN112359297 A CN 112359297A
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China
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carbon fiber
powder
carbon fibers
composite material
short carbon
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CN202010644321.0A
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Inventor
熊博文
刘康
王振军
熊威
伍翔
任佳俊
蔡长春
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Nanchang Hangkong University
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Nanchang Hangkong University
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C47/00—Making alloys containing metallic or non-metallic fibres or filaments
    • C22C47/14—Making alloys containing metallic or non-metallic fibres or filaments by powder metallurgy, i.e. by processing mixtures of metal powder and fibres or filaments
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C49/00—Alloys containing metallic or non-metallic fibres or filaments
    • C22C49/02—Alloys containing metallic or non-metallic fibres or filaments characterised by the matrix material
    • C22C49/10—Refractory metals
    • C22C49/11—Titanium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C49/00—Alloys containing metallic or non-metallic fibres or filaments
    • C22C49/14—Alloys containing metallic or non-metallic fibres or filaments characterised by the fibres or filaments

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)

Abstract

The invention discloses a short carbon fiber reinforced Ti2A preparation method of AlNb composite material. Ti2The AlNb alloy has good high-temperature performance, low density and good oxidation resistance, is considered to replace the nickel-based superalloy in service to be applied to the key high-temperature structural material of an aircraft engine, has very important application prospect, but Ti2The low room temperature plasticity and toughness of the AlNb alloy are main reasons for preventing the AlNb alloy from being applied to an aeroengine in a large scale. The carbon fiber has extremely high tensile strength, Young modulus and low density as a novel functional material with excellent performance, and the short carbon fiber as a reinforcing body can obviously improve the strength and toughness of the composite material and avoid eachAnd (4) anisotropy. The invention adopts short carbon fiber to reinforce Ti2The performance of the AlNb alloy is optimized, the combat performance of the aircraft can be greatly improved, and more powerful guarantee is provided for safeguarding the national owner rights and the rights and interests of people.

Description

Short carbon fiber reinforced Ti2Preparation method of AlNb composite material
Technical Field
The invention relates to the technical field of metal matrix composite preparation, in particular to short carbon fiber reinforced Ti2A preparation method of AlNb composite material.
Background
Ti2The AlNb alloy has good high-temperature performance, low density and good oxidation resistance, is considered to be a key high-temperature structural material for replacing the nickel-based high-temperature alloy in the future to be applied to an aeroengine, and has very important application prospect, for example, the AlNb alloy can reduce weight by about 35 percent when replacing Inconel 718 alloy (national mark GH4169) as a part of the aeroengine, so that the thrust-weight ratio of the engine is greatly improved, and the energy consumption is reduced. However, Ti2The AlNb alloy has low room temperature plasticity and toughness and poor hot working deformation capability, is slightly superior to Ti-Al alloy, still belongs to a material difficult to deform, has more prominent problems when being used for preparing aeroengine components with complex shapes, and is a main reason for preventing the AlNb alloy from being applied to aeroengines in scale. The carbon fiber is used as a novel functional material with excellent performance, has extremely high tensile strength, Young modulus and low density, and can greatly improve the comprehensive performance of the composite material due to the super-strong mechanical property. The short carbon fiber as a reinforcing body can obviously improve the strength of the composite material and avoid anisotropy, meanwhile, the fiber reinforcing body can passivate the tips of cracks in a matrix material or change the direction, in addition, the toughness of the composite material can be improved through composite toughening modes such as fiber bridging, pulling out and the like, and the short carbon fiber is widely applied to toughening the composite material. Thus using short carbon fibers to reinforce Ti2The AlNb alloy can effectively optimize the performance of the AlNb alloy and promote the application of the AlNb alloy to aeronautical engines, thereby greatly improving the operational performance of aircrafts and providing more powerful guarantee for safeguarding the mastery of the state and the rights and interests of people.
Disclosure of Invention
The invention aims to solve the problems that: provides a short carbon fiber reinforced Ti2The preparation method of AlNb composite material solves the problem of Ti2The AlNb alloy has low room temperature plasticity and toughness and poor hot working deformation capability.
The technical scheme provided by the invention for solving the problems is as follows: short carbon fiber reinforced Ti2A method of making an AlNb composite, the method comprising the steps of:
step 1, chopping long carbon fibers, and cutting into short carbon fibers with a certain length;
step 2, filling Ti powder, Al powder and Nb powder into a ball milling tank in proportion;
step 3, adding the ball-milling tank filled with the powder material prepared in the step 2 into a steel ball according to a certain ball-material ratio, repeating the steps of vacuumizing and filling argon for a plurality of times, and performing ball milling on a planetary ball mill to prepare the powder material with uniformly dispersed Ti powder, Al powder and Nb powder;
step 4, adding the short carbon fibers prepared in the step 1 into the powder mixture prepared in the step 3 according to a certain mass fraction or volume fraction, and mechanically stirring to uniformly disperse the short carbon fibers into the powder mixture prepared in the step 3;
step 5, the mixed material obtained in the step 4 is filled into a high-strength graphite die, and vacuum discharge plasma sintering is carried out to obtain carbon fiber reinforced Ti2AlNb composite material.
Preferably, the carbon fibers in the step 1 include low-elasticity-modulus carbon fibers, standard-elasticity-modulus carbon fibers, medium-elasticity-modulus carbon fibers, high-elasticity-modulus carbon fibers and super high-elasticity-modulus carbon fibers, the diameter of the short carbon fibers is 1-30 μm, and the length of the short carbon fibers is 0.01-10 mm.
Preferably, the ball-to-material ratio (by weight) in the step 3 is 8-15: 1, wherein the vacuum-argon filling treatment needs to be repeated for more than 2 times, the vacuum degree is-0.09 to-0.1 MPa, the argon purity is more than or equal to 99.5 vol.%, the ball milling time is 1-8 h, and the rotation rate is 250-500 r/min.
Preferably, the mass fraction of the short carbon fibers added in the step 4 is 0.1-60% or the volume fraction is 0.1-80%, the mechanical stirring rotation rate is 150-2000 r/min, and the mechanical stirring time is 0.5-10 h.
Preferably, in the step 5, the vacuum discharge plasma sintering is performed, wherein the vacuum degree is-0.09 to-0.1 MPa, the sintering pressure is 30 to 200MPa, the sintering pressure maintaining time is 30 to 240min, and the sintering temperature is 950 to 1400 ℃.
Compared with the prior art, the invention has the advantages that: the short carbon fiber has the same performance as the long carbon fiber, but can avoid anisotropy caused by the long carbon fiber reinforced composite material, the short fiber reinforcement can passivate the crack tip in the matrix material or change the direction, and in addition, the plasticity and toughness of the composite material can be improved through composite toughening modes such as fiber bridging, pulling out and the like, and the composite material can be used for treating Ti2The plasticity and the toughness of the AlNb alloy are improved obviously.
Drawings
The accompanying drawings, which 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 shows short carbon fiber-reinforced Ti in example 1 of the present invention2Microstructure diagram of AlNb composite material.
Detailed Description
The embodiments of the present invention will be described in detail with reference to the accompanying drawings and examples, so that how to implement the technical means for solving the technical problems and achieving the technical effects of the present invention can be fully understood and implemented.
Example 1
Step 1, chopping long carbon fibers, and cutting into short carbon fibers with a certain length, wherein the carbon fibers comprise low-elasticity-modulus carbon fibers, standard-elasticity-modulus carbon fibers, medium-elasticity-modulus carbon fibers, high-elasticity-modulus carbon fibers and super high-elasticity-modulus carbon fibers, the diameter of the short carbon fibers is about 7 mu m, and the length of the chopped short carbon fibers is 20 mm;
step 2, filling Ti powder, Al powder and Nb powder into a ball milling tank in proportion;
step 3, adding the ball milling tank filled with the powder material prepared in the step 2 into a ball milling tank according to a certain ball-material ratio (weight) of 8:1, repeating vacuumizing and argon filling for 2 times, wherein the vacuum degree is-0.09 to-0.1 MPa, the argon purity is more than or equal to 99.5 vol%, and then performing ball milling on a planetary ball mill for 2 hours at a rotation rate of 200r/min to prepare the powder material with uniformly dispersed Ti powder, Al powder and Nb powder;
and 4, adding the short carbon fiber prepared in the step 1 into the powder mixture prepared in the step 3 according to a certain mass fraction or volume fraction, wherein the mass fraction of the added short carbon fiber is 2%, and mechanically stirring at a mechanical stirring rotation rate of 200r/min for 2h to uniformly disperse the short carbon fiber and the powder mixture prepared in the step 3.
And 5, loading the mixed material obtained in the step 4 into a high-strength graphite mold, and performing vacuum discharge plasma sintering, wherein the sintering vacuum degree is-0.09 MPa to-0.1 MPa, the sintering pressure is 30MPa, the sintering pressure holding time is 60min, the sintering temperature is 1250 ℃, so that the carbon fiber reinforced Ti is obtained2AlNb composite material, carbon fiber reinforced Ti2The microstructure of the AlNb composite material is shown in fig. 1.
The foregoing is merely illustrative of the preferred embodiments of the present invention and is not to be construed as limiting the claims. The present invention is not limited to the above embodiments, and the specific structure thereof is allowed to vary. All changes which come within the scope of the invention as defined by the independent claims are intended to be embraced therein.

Claims (5)

1. Short carbon fiber reinforced Ti2The preparation method of the AlNb composite material is characterized by comprising the following steps:
step 1, chopping long carbon fibers, and cutting into short carbon fibers with a certain length;
step 2, filling Ti powder, Al powder and Nb powder into a ball milling tank in proportion;
step 3, adding the ball-milling tank filled with the powder material prepared in the step 2 into a steel ball according to a certain ball-material ratio, repeating the steps of vacuumizing and filling argon for a plurality of times, and performing ball milling on a planetary ball mill to prepare the powder material with uniformly dispersed Ti powder, Al powder and Nb powder;
step 4, adding the short carbon fibers prepared in the step 1 into the powder mixture prepared in the step 3 according to a certain mass fraction or volume fraction, and mechanically stirring to uniformly disperse the short carbon fibers into the powder mixture prepared in the step 3;
step 5, the mixed material obtained in the step 4 is filled into a high-strength graphite die, and vacuum discharge plasma sintering is carried out to obtain carbon fiber reinforced Ti2AlNb composite material.
2. A carbon fiber reinforced Ti according to claim 12The preparation method of the AlNb composite material is characterized in that the carbon fibers in the step 1 comprise low-elasticity-modulus, standard-elasticity-modulus, medium-elasticity-modulus, high-elasticity-modulus and super-high-elasticity-modulus carbon fibers, the diameter of the short carbon fibers is 1-30 mu m, and the length of the short carbon fibers is 0.01-10 mm.
3. A carbon fiber reinforced Ti according to claim 12The preparation method of the AlNb composite material is characterized in that the ball-to-material ratio (weight) in the step 3 is 8-15: 1, wherein the vacuum pumping-argon filling treatment needs to be repeated for more than 2 times, the vacuum degree is-0.09-0.1 MPa, the argon purity is more than or equal to 99.5 vol.%, the ball milling time is 1-8 h, and the rotation rate is 250-500 r/min.
4. A carbon fiber reinforced Ti according to claim 12The preparation method of the AlNb composite material is characterized in that the mass fraction or volume fraction of the short carbon fibers added in the step 4 is 0.1-60%, the mechanical stirring rotation rate is 150-2000 r/min, and the mechanical stirring time is 0.5-10 h.
5. A carbon fiber reinforced Ti according to claim 12The preparation method of the AlNb composite material is characterized in that in the step 5, vacuum discharge plasma sintering is carried out, the vacuum degree is-0.09 MPa to-0.1 MPa, the sintering pressure is 30MPa to 200MPa, the sintering pressure maintaining time is 30 min to 240min, and the sintering temperature is 950 ℃ to 1400 ℃.
CN202010644321.0A 2020-07-07 2020-07-07 Short carbon fiber reinforced Ti2Preparation method of AlNb composite material Pending CN112359297A (en)

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Application publication date: 20210212