CN102139370A - Method for preparing Ti2AlC self-lubricating and heat-resisting structural material - Google Patents
Method for preparing Ti2AlC self-lubricating and heat-resisting structural material Download PDFInfo
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- CN102139370A CN102139370A CN 201110008354 CN201110008354A CN102139370A CN 102139370 A CN102139370 A CN 102139370A CN 201110008354 CN201110008354 CN 201110008354 CN 201110008354 A CN201110008354 A CN 201110008354A CN 102139370 A CN102139370 A CN 102139370A
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Abstract
The invention relates to a method for preparing a Ti2AlC self-lubricating and heat-resisting structural material, which is characterized by comprising the following steps of: 1, batching Ti powder and Al powder according to an atomic ratio, and performing ball milling; performing physical dispersing on the TiAl powder subjected to the ball milling and a carbon nano tube or powdered graphite; and performing plasma sintering consolidation on the TiAl/carbon nano tube or the TiAl/powdered graphite which is subjected to the physical dispersing. In the method, the consolidation time is between 700 and 1,100 DEG C, and is about 300 to 700 DEG C lower than that of the prior art, so the Ti2AlC self-lubricating and heat-resisting structural material can be prepared at a low temperature.
Description
Technical field
The present invention relates to a kind of Aero-Space and petrochemical industry self-lubricating heat resistant structure preparation methods.
Background technology
Ti
2AlC is a kind of M
N+1AX
nThe type compound integrates the premium properties of metal and pottery, as resistance to oxidation, heat-resisting shake, corrosion-resistant, high elastic modulus, high-fracture toughness, excellent conducting performance etc.In addition, Ti
2AlC also has good self-lubricating property and good processability.Therefore, this material can be used as the combustion chamber of high-temperature engine connecting rod, aircraft gas turbine engine nozzle group valve, supersonic plane, rocket tube and packing ring, high-temperature heat exchanger, gas turbine, the isostructural alternative materials of thermal protection system of spacecraft, and the following candidate material of all kinds of anti-attrition parts of work of high temeperature chemistry etching condition in the petrochemical industry, as the bearing of chemical reaction kettle agitator and fan, special machine seal etc.Yet, because the wetability of C and other constituent elements is relatively poor, and the reasons such as vaporization at high temperature of Al, Ti caused
2The synthetic phase region of AlC is narrow, synthesis temperature is high, generally is higher than 1400 ℃, has limited the preparation and the application of this material.Reduce Ti
2The synthesis temperature of AlC self-lubricating heat resistant structure material, exploring the new material synthesis mode becomes present research focus.
Summary of the invention
The objective of the invention is to overcome the high defective of synthesis temperature, propose a kind of preparation method of lower temperature.
, disperse and discharge plasma sintering technique prepares Ti as initiation material with Ti powder, Al powder and CNT or graphite powder by mechanical ball milling, physics
2AlC self-lubricating heat resistant structure material, preparation process is as follows:
1. be 2: 0.9～1.5 batchings with Ti powder and Al powder by atomic ratio Ti: Al, then purity greater than 99.99% argon gas atmosphere under ball milling, ball-milling technology: ratio of grinding media to material is 5: 1～50: 1, rotational speed of ball-mill is 100～600rpm, the ball milling time is 5～70h;
2. be 2: 0.9～1.5: 1～1.5 to carry out physics and disperse the TiAl powder behind the ball milling and CNT or powdered graphite by atomic ratio Ti: Al: C, dispersing technology: ratio of grinding media to material is 1: 1～10: 1, the dispersion rotating speed is 20～400rpm, and jitter time is 5～70h;
3. it is fixed that TiAl/ CNT after physics being disperseed or TiAl/ powdered graphite carry out plasma agglomeration, consolidation technique: consolidation temperature is 700～1100 ℃, consolidation pressure is 1～100MPa, vacuum is for being 0.01～100Pa, consolidation time is 2min～2h, programming rate is 5～200 ℃/min, and cooling rate is 5～200 ℃/min.
The present invention adopts Ti, Al mixed-powder as initial mechanical ball milling raw material, by the control ball-milling technology, acquisition has the TiAl alloy powder of a large amount of plastic deformations, small grains structure and particle size, subsequently ball milling gained TiAl alloy powder and CNT or graphite powder are mixed, obtain homodisperse TiAl/ CNT or TiAl/ graphite composite powder, utilize discharge plasma sintering technique to prepare Ti then
2AlC self-lubricating heat resistant structure material.The present invention adopts tiny behind mechanical ball milling, uniform TiAl/ CNT or TiAl/ graphite composite powder and discharge plasma sintering technique as preparation Ti
2The initiation material of AlC material and synthesis mode, reasons such as a large amount of plastic deformations and the remarkable refinement of powder particle size have been introduced because of powder particle in the mechanical milling process, effectively improved the sintering activity of powder, thereby reduce the synthesis temperature of material, consolidation temperature is 700～1100 ℃, than low about 300～700 ℃ of prior art, realize cryogenic conditions preparation Ti down
2AlC self-lubricating heat resistant structure material technology path is Ti
2AlC self-lubricating heat resistant structure material lays the foundation in the application of Aero-Space and petrochemical industry.
Description of drawings
Fig. 1 is material material phase analysis result behind embodiment 1 sintering.
Specific embodiments
Embodiment 1: with Ti powder, Al powder and CNT is raw material, adopts mechanical ball milling and discharge plasma sintering technique to prepare Ti
2AlC self-lubricating heat resistant structure material, step is as follows:
1.500 order, purity are 99.9% Ti powder and 325 orders, purity is 99.9% Al powder, is 2: 1.1 batchings by atomic ratio Ti: Al;
2. the batching in the step 1 is put into the Stainless Steel Vacuum ball grinder, bleed, and then charge into purity greater than 99.99% argon gas, repeatedly pumping, inflation 4 times, carry out mechanical ball milling then, the ball-milling technology condition: ratio of grinding media to material is 20: 1, ball milling speed is 400rpm, and the ball milling time is 50h; A large amount of plastic deformations and alloying have taken place in powder behind the ball milling, and part ball-milled powder particle size reaches 200nm;
3. the alloy powder with a large amount of plastic deformations with gained in the step 2 mixes with commercial CNT, utilizing ball mill to carry out physics disperses, wherein to satisfy atomic ratio Ti: Al: C be 2: 1.1: 1.1 to the addition of CNT, dispersing technology: ratio of grinding media to material is 2: 1, jitter time is 50h, and the dispersion rotating speed is 150rpm;
4. it is fixed to adopt discharge plasma sintering technique to carry out the mixed-powder that obtains in the step 3, and consolidation technique: consolidation temperature is 900 ℃, and consolidation time is 20min, and consolidation pressure is 60MPa, and programming rate is 100 ℃/min, and cooling rate is 10 ℃/min.The material phase analysis result of material as shown in Figure 1 behind the sintering.
Claims (1)
1. Ti
2AlC self-lubricating, heat resistant structure preparation methods is characterized in that preparation process is as follows:
(1) be 2: 0.9～1.5 batchings with Ti powder and Al powder by atomic ratio Ti: Al, then purity greater than 99.99% argon gas atmosphere under ball milling, ball-milling technology: ratio of grinding media to material is 5: 1～50: 1, rotational speed of ball-mill is 100～600rpm, the ball milling time is 5～70h;
(2) be 2: 0.9～1.5: 1～1.5 to carry out physics and disperse the TiAl powder behind the ball milling and CNT or powdered graphite by atomic ratio Ti: Al: C, dispersing technology: ratio of grinding media to material is 1: 1～10: 1, the dispersion rotating speed is 20～400rpm, and jitter time is 5～70h;
(3) it is fixed that TiAl/ CNT after physics is disperseed or TiAl/ powdered graphite carry out plasma agglomeration, consolidation technique: consolidation temperature is 700～1100 ℃, consolidation pressure is 1～100MPa, vacuum is 0.01～100Pa, consolidation time is 2min～2h, programming rate is 5～200 ℃/min, and cooling rate is 5～200 ℃/min.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103757453A (en) * | 2013-12-19 | 2014-04-30 | 陕西理工学院 | Ti3AlC2-Ti2AlC/TiAl-based composite material and preparation method thereof |
| CN103993195A (en) * | 2014-06-11 | 2014-08-20 | 天津大学 | Preparation method of ultra-fine grain titanium-aluminum-carbon particle enhanced TiAl-based composite material |
| CN104911381A (en) * | 2015-04-29 | 2015-09-16 | 陕西理工学院 | Ti2AlC/TiAl-based composite and preparation method thereof |
| CN105779825A (en) * | 2016-03-21 | 2016-07-20 | 太原理工大学 | TiAl alloy self-lubricating material and preparation method thereof |
| CN107793156A (en) * | 2017-09-22 | 2018-03-13 | 太原理工大学 | A kind of preparation method of fine and close Ti2AlC materials |
| CN107988502A (en) * | 2017-12-01 | 2018-05-04 | 新疆维吾尔自治区产品质量监督检验研究院 | Intermatallic Ti-Al compound based self lubricated composite material and preparation method thereof |
| CN114890413A (en) * | 2022-04-15 | 2022-08-12 | 中南大学 | Graphite @ Ti 2 SnC powder particles and preparation method thereof |
| CN115255359A (en) * | 2022-06-21 | 2022-11-01 | 河南科技大学 | Ti in a net-layer structure2AlC/TiAl composite material and preparation method thereof |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103757453A (en) * | 2013-12-19 | 2014-04-30 | 陕西理工学院 | Ti3AlC2-Ti2AlC/TiAl-based composite material and preparation method thereof |
| CN103757453B (en) * | 2013-12-19 | 2016-02-24 | 陕西理工学院 | A kind of Ti 3alC 2-Ti 2alC/TiAl based composites and preparation method thereof |
| CN103993195A (en) * | 2014-06-11 | 2014-08-20 | 天津大学 | Preparation method of ultra-fine grain titanium-aluminum-carbon particle enhanced TiAl-based composite material |
| CN104911381A (en) * | 2015-04-29 | 2015-09-16 | 陕西理工学院 | Ti2AlC/TiAl-based composite and preparation method thereof |
| CN105779825A (en) * | 2016-03-21 | 2016-07-20 | 太原理工大学 | TiAl alloy self-lubricating material and preparation method thereof |
| CN105779825B (en) * | 2016-03-21 | 2017-08-22 | 太原理工大学 | A kind of TiAl alloy self-lubricating material and preparation method thereof |
| CN107793156A (en) * | 2017-09-22 | 2018-03-13 | 太原理工大学 | A kind of preparation method of fine and close Ti2AlC materials |
| CN107793156B (en) * | 2017-09-22 | 2020-10-30 | 太原理工大学 | Preparation method of compact Ti2AlC material |
| CN107988502A (en) * | 2017-12-01 | 2018-05-04 | 新疆维吾尔自治区产品质量监督检验研究院 | Intermatallic Ti-Al compound based self lubricated composite material and preparation method thereof |
| CN114890413A (en) * | 2022-04-15 | 2022-08-12 | 中南大学 | Graphite @ Ti 2 SnC powder particles and preparation method thereof |
| CN114890413B (en) * | 2022-04-15 | 2023-09-01 | 中南大学 | Graphite @ Ti 2 SnC powder particles and preparation method thereof |
| CN115255359A (en) * | 2022-06-21 | 2022-11-01 | 河南科技大学 | Ti in a net-layer structure2AlC/TiAl composite material and preparation method thereof |
| CN115255359B (en) * | 2022-06-21 | 2024-01-19 | 河南科技大学 | Ti in a network-layer structure 2 AlC/TiAl composite material and preparation method thereof |
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Application publication date: 20110803 |