CN113020604A - High-strength wear-resistant high-temperature-resistant titanium-aluminum oxide alloy material and preparation method thereof - Google Patents
High-strength wear-resistant high-temperature-resistant titanium-aluminum oxide alloy material and preparation method thereof Download PDFInfo
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- 239000000956 alloy Substances 0.000 title claims abstract description 55
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- VQYHBXLHGKQYOY-UHFFFAOYSA-N aluminum oxygen(2-) titanium(4+) Chemical compound [O-2].[Al+3].[Ti+4] VQYHBXLHGKQYOY-UHFFFAOYSA-N 0.000 title claims abstract description 14
- 238000000498 ball milling Methods 0.000 claims abstract description 47
- 239000000843 powder Substances 0.000 claims abstract description 38
- 229910000838 Al alloy Inorganic materials 0.000 claims abstract description 33
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 33
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 31
- 239000002131 composite material Substances 0.000 claims abstract description 29
- 238000000034 method Methods 0.000 claims abstract description 29
- UQZIWOQVLUASCR-UHFFFAOYSA-N alumane;titanium Chemical compound [AlH3].[Ti] UQZIWOQVLUASCR-UHFFFAOYSA-N 0.000 claims abstract description 26
- 238000005245 sintering Methods 0.000 claims abstract description 22
- 239000011812 mixed powder Substances 0.000 claims abstract description 21
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims abstract description 20
- 229910021389 graphene Inorganic materials 0.000 claims abstract description 18
- 239000002135 nanosheet Substances 0.000 claims abstract description 17
- 238000002156 mixing Methods 0.000 claims abstract description 13
- 238000007731 hot pressing Methods 0.000 claims abstract description 12
- 239000011733 molybdenum Substances 0.000 claims abstract description 12
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 12
- 238000003825 pressing Methods 0.000 claims abstract description 10
- 230000008569 process Effects 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims description 15
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 14
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 14
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 14
- 238000000227 grinding Methods 0.000 claims description 13
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 7
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 7
- 229910052782 aluminium Inorganic materials 0.000 claims description 7
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 7
- 229910052799 carbon Inorganic materials 0.000 claims description 7
- 229910052804 chromium Inorganic materials 0.000 claims description 7
- 239000011651 chromium Substances 0.000 claims description 7
- 229910052742 iron Inorganic materials 0.000 claims description 7
- 229910052758 niobium Inorganic materials 0.000 claims description 7
- 239000010955 niobium Substances 0.000 claims description 7
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 claims description 7
- 229910052757 nitrogen Inorganic materials 0.000 claims description 7
- 229910052760 oxygen Inorganic materials 0.000 claims description 7
- 239000001301 oxygen Substances 0.000 claims description 7
- 229910052710 silicon Inorganic materials 0.000 claims description 7
- 239000010703 silicon Substances 0.000 claims description 7
- 239000010936 titanium Substances 0.000 claims description 7
- 229910052719 titanium Inorganic materials 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 3
- 238000001238 wet grinding Methods 0.000 claims description 3
- 238000003801 milling Methods 0.000 claims description 2
- 238000010304 firing Methods 0.000 claims 1
- 238000011161 development Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 4
- 230000003647 oxidation Effects 0.000 description 16
- 238000007254 oxidation reaction Methods 0.000 description 16
- 229910010038 TiAl Inorganic materials 0.000 description 8
- 229910002804 graphite Inorganic materials 0.000 description 6
- 239000010439 graphite Substances 0.000 description 6
- 238000001291 vacuum drying Methods 0.000 description 6
- 238000001035 drying Methods 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 230000004584 weight gain Effects 0.000 description 4
- 235000019786 weight gain Nutrition 0.000 description 4
- 230000009467 reduction Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000005275 alloying Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 229910006281 γ-TiAl Inorganic materials 0.000 description 1
Classifications
-
- 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
- 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
- B22F3/16—Both compacting and sintering in successive or repeated steps
-
- 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
-
- 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
- C22C1/10—Alloys containing non-metals
- C22C1/1084—Alloys containing non-metals by mechanical alloying (blending, milling)
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C14/00—Alloys based on titanium
Abstract
The invention discloses a high-strength wear-resistant high-temperature-resistant titanium-aluminum oxide alloy material and a preparation method thereof, wherein TiAl4822 pre-alloy powder, graphene nanosheets and molybdenum are subjected to wet ball milling mixing to obtain mixed powder; pressing the mixed powder into a blank; and carrying out vacuum hot-pressing sintering to obtain the titanium-aluminum alloy composite material. The invention adopts the methods of mechanical ball milling and vacuum hot pressing sintering to perfect the innovation development of the titanium-aluminum alloy, and has simple process and obvious effect.
Description
Technical Field
The invention belongs to the technical field of alloy materials, and particularly relates to a high-strength wear-resistant high-temperature-resistant titanium oxide aluminum alloy material and a preparation method thereof.
Background
The TiAl-based alloy has the excellent characteristics of light weight, high strength, high room temperature specific modulus, high specific strength, good high-temperature creep resistance and the like, plays an important role in improving the thrust-weight ratio and the fuel efficiency of aerospace and vehicle engines, and is widely applied to the aerospace and automobile industries. However, the TiAl-based alloy has poor room temperature shaping and wear resistance, insufficient oxidation resistance at a temperature of over 800 ℃ and the like, which become the bottleneck of the application, and how to improve the performance of the TiAl-based alloy is greatly valued by researchers.
The TiAl4822 alloy is a second generation TiAl alloy, is firstly completed by the American air force materials institute and GE company, has high room temperature plasticity, is applied to the low-pressure turbine 6 and 7-grade blades of the engine by Howmet company, GE company, Boeing company and the like, and is considered as a TiAl alloy with the highest engineering development value. Because the high-temperature high-pressure wear-resistant steel is usually in a service working condition of high temperature, high pressure and high wear, how to improve the strength, the wear-resistant performance and the high-temperature oxidation resistance of the high-temperature wear-resistant steel is an urgent problem to be solved.
In recent years, researchers in various countries have conducted some studies on the composition design and structure control of TiAl-based alloys, such as: the heat treatment, alloying and introduction of reinforcement are equal, so that the mechanical property of the TiAl-based alloy is obviously improved. The star material Graphene nano sheets (GN) provide motive power for development of composite materials by virtue of ultra-thin and high-strength characteristics and are considered as ideal reinforcements; in addition, the addition of the molybdenum element changes the oxidation mechanism of the alloy material and can obviously enhance the high-temperature oxidation resistance of the alloy material.
Therefore, in order to solve the above problems, it is necessary to provide a method for preparing a titanium-aluminum alloy material, which can solve the problems in the prior art.
Disclosure of Invention
The invention aims to solve the technical problem of providing a high-strength wear-resistant high-temperature-resistant titanium-aluminum oxide alloy material and a preparation method thereof aiming at the defects in the prior art, perfects the innovative development of titanium-aluminum alloy by adopting a mechanical ball milling and vacuum hot-pressing sintering method, and has simple process and obvious effect.
The invention adopts the following technical scheme:
a preparation method of a high-strength wear-resistant high-temperature-resistant titanium oxide aluminum alloy material comprises the steps of carrying out wet ball milling mixing on TiAl4822 pre-alloy powder, graphene nanosheets and molybdenum to obtain mixed powder; pressing the mixed powder into a blank; and carrying out vacuum hot-pressing sintering to obtain the titanium-aluminum alloy composite material.
Specifically, the weight percentages are as follows: 99.0%, 96.0% or 95.0% of TiAl4822 pre-alloyed powder, 0% or 1.0% of graphene nano-sheet and 0% or 4.0% of molybdenum.
Further, the TiAl4822 pre-alloyed powder comprises the following components in percentage by mass: 0.013% carbon, 0.067% oxygen, 0.003% nitrogen, 0.01% silicon, 0.051% iron, 2.30% chromium, 4.80% niobium, 32.47% aluminum, and the balance titanium.
Specifically, in the wet ball milling mixing process, the grinding balls and the ball milling tank are made of zirconia materials, the ball-material ratio is 4:1, the ball milling time is 12 hours, and the rotating speed is 300 r/min.
Furthermore, the diameter of the grinding ball is 5mm, and the diameter of the ball milling tank is 100 mm.
Further, the degree of vacuum in the ball mill tank was 10-1Pa。
Specifically, the powder after ball milling and mixing is firstly put into a vacuum drying oven and dried for 12 hours at 65 ℃.
Specifically, the mixed powder was charged into a die and pressed under a pressure of 25MPa to obtain a green compact.
Specifically, the sintering temperature is 1200 ℃, the roasting time is 60min, and then the furnace cooling is carried out.
According to another technical scheme, the high-strength wear-resistant high-temperature-resistant titanium oxide aluminum alloy material is prepared by the method.
Compared with the prior art, the invention has at least the following beneficial effects:
the invention relates to a preparation method of a high-strength wear-resistant high-temperature-resistant titanium oxide aluminum alloy material, which comprises the steps of carrying out wet ball milling mixing on TiAl4822 pre-alloy powder, graphene nanosheets and pure molybdenum powder to obtain mixed powder; pressing the mixed powder into a blank; the titanium-aluminum alloy composite material is obtained through vacuum hot pressing sintering, the process is simple, and the service performance of the TiAl4822 alloy is further improved.
Further, the selected TiAl4822 alloy comprises, in actual mass fraction: 0.013% carbon, 0.067% oxygen, 0.003% nitrogen, 0.01% silicon, 0.051% iron, 2.30% chromium, 4.80% niobium, 32.47% aluminum, and the balance titanium. The TiAl4822 alloy is the second generation TiAl alloy, and has better plastic processing performance and wide application field.
Furthermore, 1.0% of graphene nanosheets are high-quality reinforcing phases with optimal content, so that the hardness and wear resistance of the TiAl4822 alloy can be improved; 4.0 percent of molybdenum is the addition amount of the molybdenum element with the optimal content, and the high-temperature oxidation resistance of the TiAl4822 alloy can be improved.
Furthermore, the powder can be effectively and uniformly mixed by mechanical wet ball milling, absolute ethyl alcohol is used as a wet milling medium, the ball-material ratio is 4:1, the ball milling time is 12 hours, and the rotating speed of the ball mill is set to be 300 r/min.
Furthermore, the grinding balls and the ball milling tank are made of zirconia materials, and the grinding balls and the ball milling tank are hard and cannot be damaged, so that the purity of the powder is influenced; the diameter of the grinding ball is 5mm, the diameter of the ball milling tank is 100mm, and the powder is effectively mixed.
Further, in order to prevent the powder from being oxidized, the ball milling tank is vacuumized, so that the vacuum degree in the ball milling tank is kept at 10- 1Pa。
Further, after ball milling, the mixed powder is put into a vacuum drying oven for drying at 65 ℃ for 12h, so that the purity of the powder is ensured.
Further, the mixed powder is filled into a die and pressed under the pressure of 25MPa to obtain a blank, so that the powder leakage phenomenon caused by overlarge pressure is avoided, and the sintering defect caused by overlarge powder pores can also be effectively avoided.
Furthermore, the mould and the powder are separated by graphite paper, so that the blank and the mould are prevented from reacting.
Further, the sintering temperature is 1200 ℃, and the TiAl4822 alloy composite material with fine and uniform tissue is obtained by furnace cooling after roasting for 60 min.
In conclusion, the preparation method of the high-strength wear-resistant high-temperature-resistant titanium oxide aluminum alloy material is simple in process and remarkable in effect.
The technical solution of the present invention is further described in detail by the following examples.
Detailed Description
It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be further understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.
The invention provides a preparation method of a high-strength wear-resistant high-temperature-resistant titanium oxide aluminum alloy material, which comprises the following steps of: 99.0%/95.0%/94.0% of TiAl4822 pre-alloyed powder, 0/1.0% of graphene nano-sheet and 0/4.0% of molybdenum; carrying out wet ball milling mixing on TiAl4822 pre-alloy powder, graphene nanosheets and molybdenum powder in a planetary ball mill; putting the mixed powder into a die, and pressing under the pressure of 25MPa to obtain a blank; and (3) carrying out vacuum hot-pressing sintering on the blank to obtain the titanium-aluminum alloy composite material. The titanium-aluminum alloy material has good strength, wear resistance and high-temperature oxidation resistance, and has wider application value.
The invention relates to a preparation method of a high-strength wear-resistant high-temperature-resistant titanium-aluminum oxide alloy material, which comprises the following steps:
s1, mixing the following materials in percentage by mass: 99.0%, 96.0% or 95.0% of TiAl4822 pre-alloyed powder, 0% or 1.0% of graphene nano-sheet and 0% or 4.0% of molybdenum;
the TiAl4822 comprises the following chemical components: 0.013% carbon, 0.067% oxygen, 0.003% nitrogen, 0.01% silicon, 0.051% iron, 2.30% chromium, 4.80% niobium, 32.47% aluminum, and the balance titanium.
S2, carrying out wet ball milling and mixing on TiAl4822 pre-alloyed powder, graphene nano sheets and molybdenum powder in a planetary ball mill;
the ball milling tank and the grinding balls (the diameter of the ball milling tank is 100mm, the diameter of the grinding balls is 5mm) are made of zirconia, the ball material ratio is 4:1, absolute ethyl alcohol is used as a wet milling medium, the ball milling time is 12h, and the rotating speed of the ball mill is set to be 300 r/min; after ball milling, the mixed powder is put into a vacuum drying oven for drying and dried for 12 hours at 65 ℃.
In order to prevent the powder from being oxidized, the ball milling tank is vacuumized, so that the vacuum degree in the ball milling tank is kept at 10-1Pa。
S3, filling the mixed powder into a die, and pressing under the pressure of 25MPa to obtain a blank;
the mould is separated from the powder by graphite paper, so that the blank is prevented from reacting with the mould.
And S4, carrying out vacuum hot-pressing sintering on the blank to obtain the titanium-aluminum alloy composite material.
The sintering temperature is 1200 ℃, and the titanium-aluminum alloy composite material is obtained after the titanium-aluminum alloy composite material is roasted for 60min and cooled along with the furnace.
The titanium-aluminum alloy composite material prepared by the method has good strength, wear resistance and high-temperature oxidation resistance, 1.0% of graphene nanosheets are high-quality reinforcing phases with optimal content, and the hardness and wear resistance of the TiAl4822 alloy can be improved; 4.0 percent of molybdenum is the addition amount of the molybdenum element with the optimal content, and the high-temperature oxidation resistance of the TiAl4822 alloy can be improved. Moreover, the sintering temperature is 1200 ℃, the temperature is kept for 60min, and furnace cooling is carried out, so that the TiAl4822 alloy is a typical gamma TiAl alloy, the grains are fine, and the structure performance is better.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are a part of the embodiments of the present invention, but not all of the embodiments. The components of embodiments of the present invention generally described and illustrated herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The preparation method of this example includes the following steps:
the method comprises the following steps: placing TiAl4822 alloy powder into a die, and pressing under the pressure of 25MPa to obtain a blank; the mould is separated from the powder by graphite paper, so that the blank is prevented from reacting with the mould.
Step two: carrying out vacuum hot-pressing sintering on the blank to obtain a titanium-aluminum alloy composite material; the sintering temperature is 1200 ℃, and the titanium-aluminum alloy composite material is obtained after the titanium-aluminum alloy composite material is roasted for 60min and cooled along with the furnace.
The TiAl4822 alloy material prepared by the method in the embodiment has good compactness, and the microhardness, the friction coefficient, the wear rate and the oxidation gain of the TiAl4822 alloy material are respectively tested by adopting a digital display microhardness, a ball-disk linear reciprocating friction and wear testing machine, a muffle furnace and a precise electronic balance. The detection shows that the microhardness is 240.5Hv, the friction coefficient is 0.6026, and the wear rate is 0.134510-4mg/N.m, oxidation weight gain of 3.92mg/cm2。
Example 2
The preparation method of this example includes the following steps:
the method comprises the following steps: the materials are prepared according to the following mass percentages: 99.0% of TiAl4822 pre-alloyed powder and 1.0% of graphene nano-sheets; wherein, the TiAl4822 comprises the following chemical components: 0.013% carbon, 0.067% oxygen, 0.003% nitrogen, 0.01% silicon, 0.051% iron, 2.30% chromium, 4.80% niobium, 32.47% aluminum, and the balance titanium.
Step two: carrying out wet ball milling mixing on the TiAl4822 pre-alloyed powder and the graphene nanosheets in a planetary ball mill; ball milling pot and milling balls (the diameter of the ball milling pot is100. The diameter of the grinding ball is 5mm) is all made of zirconia, the ball-material ratio is 4:1, the ball-milling time is 12h, and the rotating speed of the ball mill is set to be 300 r/min. To prevent the powder from being oxidized, the vacuum degree in the ball milling tank is kept at 10- 1Pa. After ball milling, the mixed powder is put into a vacuum drying oven for drying and dried for 12 hours at 65 ℃.
Step three: putting the mixed powder into a die, and pressing under the pressure of 25MPa to obtain a blank; the mould is separated from the powder by graphite paper, so that the blank is prevented from reacting with the mould.
Step four: carrying out vacuum hot-pressing sintering on the blank to obtain a titanium-aluminum alloy composite material; the sintering temperature is 1200 ℃, and the titanium-aluminum alloy composite material is obtained after the titanium-aluminum alloy composite material is roasted for 60min and cooled along with the furnace.
The TiAl4822 alloy composite material prepared by the method in the embodiment has good compactness, and the microhardness, the friction coefficient, the wear rate and the oxidation gain of the TiAl4822 alloy composite material are respectively tested by adopting a digital display microhardness, a ball-disk linear reciprocating friction and wear testing machine, a muffle furnace and a precise electronic balance. Through detection, the microhardness is 302Hv, which is improved by 25.9%; the friction coefficient is 0.5642, which is reduced by 6.4%; wear rate was 0.054610-4mg/N.m, reduced by 59.4%; the oxidation weight gain is 3.77mg/cm2The reduction is 3.8%.
Example 3
The preparation method of this example includes the following steps:
the method comprises the following steps: the materials are prepared according to the following mass percentages: 96.0 percent of TiAl4822 pre-alloyed powder and 4.0 percent of molybdenum; wherein, the TiAl4822 comprises the following chemical components: 0.013% carbon, 0.067% oxygen, 0.003% nitrogen, 0.01% silicon, 0.051% iron, 2.30% chromium, 4.80% niobium, 32.47% aluminum, and the balance titanium.
Step two: carrying out wet ball milling mixing on TiAl4822 pre-alloy powder and molybdenum powder in a planetary ball mill; the ball milling tank and the grinding balls (with the diameter of 100mm and 5mm) are made of zirconia, the ball-material ratio is 4:1, the ball milling time is 12 hours, and the rotating speed of the ball mill is set to be 300 r/min. To prevent the powder from being oxidized, the vacuum degree in the ball milling tank is kept at 10-1Pa. After ball milling, mixingThe powder is put into a vacuum drying oven for drying and dried for 12 hours at 65 ℃.
Step three: putting the mixed powder into a die, and pressing under the pressure of 25MPa to obtain a blank; the mould is separated from the powder by graphite paper, so that the blank is prevented from reacting with the mould.
Step four: carrying out vacuum hot-pressing sintering on the blank to obtain a titanium-aluminum alloy composite material; the sintering temperature is 1200 ℃, and the titanium-aluminum alloy composite material is obtained after the titanium-aluminum alloy composite material is roasted for 60min and cooled along with the furnace.
The TiAl4822 alloy composite material prepared by the method in the embodiment has good compactness, and the microhardness, the friction coefficient, the wear rate and the oxidation gain of the TiAl4822 alloy composite material are respectively tested by adopting a digital display microhardness, a ball-disk linear reciprocating friction and wear testing machine, a muffle furnace and a precise electronic balance. Through detection, the microhardness is 287.8Hv, which is improved by 19.7%; the friction coefficient is 0.5898, which is reduced by 2.2%; wear rate was 0.095910-4mg/N.m, reduced by 28.7%; the oxidation weight gain is 2.86mg/cm2And the reduction is 27.0%.
Example 4
The preparation method of this example includes the following steps:
the method comprises the following steps: the materials are prepared according to the following mass percentages: 94.0% of TiAl4822 pre-alloyed powder, 1.0% of graphene nanosheet and 4.0% of molybdenum; wherein, the TiAl4822 comprises the following chemical components: 0.013% carbon, 0.067% oxygen, 0.003% nitrogen, 0.01% silicon, 0.051% iron, 2.30% chromium, 4.80% niobium, 32.47% aluminum, and the balance titanium.
Step two: carrying out wet ball milling mixing on TiAl4822 pre-alloy powder, graphene nanosheets and molybdenum powder in a planetary ball mill; the ball milling tank and the grinding balls (the diameter of the ball milling tank is 100, the diameter of the grinding balls is 5mm) are made of zirconia, the ball-material ratio is 4:1, the ball milling time is 12 hours, and the rotating speed of the ball mill is set to be 300 r/min. To prevent the powder from being oxidized, the vacuum degree in the ball milling tank is kept at 10-1Pa. After ball milling, the mixed powder is put into a vacuum drying oven for drying and dried for 12 hours at 65 ℃.
Step three: putting the mixed powder into a die, and pressing under the pressure of 25MPa to obtain a blank; the mould is separated from the powder by graphite paper, so that the blank is prevented from reacting with the mould.
Step four: carrying out vacuum hot-pressing sintering on the blank to obtain a titanium-aluminum alloy composite material; the sintering temperature is 1200 ℃, and the titanium-aluminum alloy composite material is obtained after the titanium-aluminum alloy composite material is roasted for 60min and cooled along with the furnace.
The TiAl4822 alloy composite material prepared by the method in the embodiment has good compactness, and the microhardness, the friction coefficient, the wear rate and the oxidation gain of the TiAl4822 alloy composite material are respectively tested by adopting a digital display microhardness, a ball-disk linear reciprocating friction and wear testing machine, a muffle furnace and a precise electronic balance. Through detection, the microhardness is 299.2Hv, which is improved by 24.4%; the friction coefficient is 0.5898, which is reduced by 8.6%; wear rate was 0.047810-4mg/N.m, reduced by 64.5%; the oxidation weight gain is 2.88mg/cm2The reduction is 26.5%.
In conclusion, the preparation method of the high-strength wear-resistant high-temperature-resistant titanium aluminum oxide alloy material is simple in process and remarkable in effect, and the tissue performance of the titanium aluminum alloy material is enhanced by adding the graphene and the molybdenum.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (10)
1. A preparation method of a high-strength wear-resistant high-temperature-resistant titanium oxide aluminum alloy material is characterized by comprising the following steps of carrying out wet ball milling mixing on TiAl4822 pre-alloy powder, graphene nanosheets and molybdenum to obtain mixed powder; pressing the mixed powder into a blank; and carrying out vacuum hot-pressing sintering to obtain the titanium-aluminum alloy composite material.
2. The method according to claim 1, characterized in that the following are calculated in mass percent: 99.0%, 96.0% or 95.0% of TiAl4822 pre-alloyed powder, 0% or 1.0% of graphene nano-sheet and 0% or 4.0% of molybdenum.
3. The method of claim 2, wherein the TiAl4822 prealloyed powder comprises, in mass percent: 0.013% carbon, 0.067% oxygen, 0.003% nitrogen, 0.01% silicon, 0.051% iron, 2.30% chromium, 4.80% niobium, 32.47% aluminum, and the balance titanium.
4. The method as claimed in claim 1, wherein in the wet ball milling mixing process, the grinding balls and the ball milling tank are made of zirconia, absolute ethyl alcohol is used as a wet milling medium, the ball-material ratio is 4:1, the ball milling time is 12h, and the rotating speed is 300 r/min.
5. The method of claim 4, wherein the grinding balls have a diameter of 5mm and the milling pot has a diameter of 100 mm.
6. The method of claim 4, wherein the degree of vacuum in the ball mill jar is 10-1Pa。
7. The method of claim 1, wherein the ball milled mixed powder is first placed in a vacuum oven and dried at 65 ℃ for 12 hours.
8. The method according to claim 1, wherein the mixed powder is charged into a die and pressed at a pressure of 25MPa to obtain a green body.
9. The method of claim 1, wherein the sintering temperature is 1200 ℃ and the firing time is 60min, followed by furnace cooling.
10. The high-strength wear-resistant high-temperature-resistant titanium-aluminum oxide alloy material prepared by the method of claim 1.
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