CN104451220A - Method of preparing compact titanium-aluminium alloy by virtue of discharge plasma sintering method - Google Patents
Method of preparing compact titanium-aluminium alloy by virtue of discharge plasma sintering method Download PDFInfo
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- CN104451220A CN104451220A CN201410739139.8A CN201410739139A CN104451220A CN 104451220 A CN104451220 A CN 104451220A CN 201410739139 A CN201410739139 A CN 201410739139A CN 104451220 A CN104451220 A CN 104451220A
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Abstract
The invention discloses a method of preparing a compact titanium-aluminium alloy by virtue of a discharge plasma sintering method. The method comprises the following steps: step 1, mixing titanium powder with aluminium powder; step 2, carrying out mechanical ball-milling on the mixed powder in an inert atmosphere by planetary ball-milling equipment; step 3, sintering the ball-milled mixed powder by virtue of the discharge plasma sintering method. The prepared titanium-aluminium alloy is excellent in mechanical performance, as well as has a grain size of 12mu m, a hardness of 850 HV, a compactness of 98.8% and a room-temperature plasticity of 5%; in addition, the method disclosed by the invention is simple in process, easy to operate, and good in industrialization prospect.
Description
Technical field
The invention belongs to alloy material preparing technical field, particularly relate to a kind of discharge plasma sintering legal system that utilizes for the method for fine and close titanium aluminum alloy.
Background technology
Ti-Al intermetallic compound, due to its excellent high-temperature behavior and high specific tenacity, is considered to one high-temperature structural material very likely, but the problem of its temperature-room type plasticity difference (elongation is 1% ~ 4%) seriously constrains it to be used.Based on the deficiency that titanium aluminum alloy exists, the present invention adopts discharge plasma sintering method (SPS) to prepare titanium aluminum alloy, to obtain the titanium aluminum alloy of fine grained texture thus to improve the temperature-room type plasticity of titanium aluminum alloy.
Summary of the invention
For prior art Problems existing, the invention provides a kind of discharge plasma sintering legal system that utilizes for the method for fine and close titanium aluminum alloy, the titanium aluminum alloy temperature-room type plasticity adopting the method to prepare significantly improves.
For solving the problems of the technologies described above, the present invention adopts following technical scheme:
Utilize discharge plasma sintering legal system for the method for fine and close titanium aluminum alloy, comprise step:
Step 1, mixing titanium valve and aluminium powder obtain mixed powder, and the mol ratio of titanium valve and aluminium powder is 1:(0.45 ~ 0.5);
Step 2, adopt planetary ball mill equipment to carry out mechanical ball milling in an inert atmosphere to mixed powder, ball-milling medium and mixed powder mass ratio are (12 ~ 15): 1, and rotating speed is (150 ~ 200) rev/min, and Ball-milling Time is 25 ~ 50 hours;
Step 3, adopt discharge plasma sintering method to sinter the mixed powder after ball milling, apply the axle pressure of (40 ~ 50) MPa in sintering process, sintering temperature is 800 ~ 1100 DEG C, and sintering time is 10 ~ 15min.
As preferably, above-mentioned titanium valve purity >=99.5%, granularity is 40 μm.
As preferably, above-mentioned aluminium powder purity >=99.6%, granularity is 30 μm.
As preferably, above-mentioned ball-milling medium is Stainless Steel Ball.
Discharge plasma sintering is a kind of novel material sintering technology, and its principal feature is the supper-fast densification sintering utilizing body heating and surface active to realize material.Because it has very high thermo-efficiency, can make to be sintered body and reach fine and close within the quickish time, sintering hard-to-sinter material be had to the advantage of its uniqueness.
The present invention utilizes mechanical activation-discharge plasma sintering method (MASPS) to achieve the superfast sintering of titanium aluminum alloy.First, the mixed powder of high-energy ball milling method to titanium valve and aluminium powder is adopted to carry out mechanical activation; Then, discharge plasma sintering method (Spark Plasma Sintering is called for short SPS) is adopted to carry out sintering synthesis to the mixed powder after mechanical activation.
Compared to the prior art, the present invention has following features and beneficial effect:
1, achieve the superfast sintering of titanium aluminum alloy, and the alloy material that crystal grain is thin, density is high can be prepared, thus improve the temperature-room type plasticity of titanium aluminum alloy.
2, technique simply, easily operates, and has good industrialization prospect.
Embodiment
The present invention is further illustrated below in conjunction with embodiment.
Embodiment
The first step: by the aluminium powder of the titanium valve of purity >=99.5%, granularity 40 μm and purity >=99.6%, granularity 30 μm by 1:(0.45 ~ 0.5) mol ratio mix.
Second step: adopt frequency conversion type planetary ball mill to carry out mechanical ball milling to mixed powder; ball-milling medium adopts Stainless Steel Ball; mechanical milling process is using argon gas as protective atmosphere; ball-milling medium and mixed powder mass ratio are (12 ~ 15): 1; rotating speed is (150 ~ 200) rev/min, and Ball-milling Time is 25 ~ 50 hours.
3rd step: the mixed powder that activates through ball milling is loaded graphite jig, then be placed in discharge plasma sintering machine and sinter, the axle pressure applying (40 ~ 50) MPa in sintering process is that sintering temperature is 800 ~ 1100 DEG C, and sintering time is 10 ~ 15min.
Titanium aluminum alloy prepared by the present embodiment has excellent mechanical property, grain fineness number 12 μm, hardness 850HV, density 98.8%; Temperature-room type plasticity 5%(elongation), and titanium aluminum alloy temperature-room type plasticity prepared by traditional method only 1% ~ 4%.
Claims (4)
1. utilize discharge plasma sintering legal system for the method for fine and close titanium aluminum alloy, it is characterized in that, comprise step:
Step 1, mixing titanium valve and aluminium powder obtain mixed powder, and the mol ratio of titanium valve and aluminium powder is 1:(0.45 ~ 0.5);
Step 2, adopt planetary ball mill equipment to carry out mechanical ball milling in an inert atmosphere to mixed powder, ball-milling medium and mixed powder mass ratio are (12 ~ 15): 1, and rotating speed is (150 ~ 200) rev/min, and Ball-milling Time is 25 ~ 50 hours;
Step 3, adopt discharge plasma sintering method to sinter the mixed powder after ball milling, apply the axle pressure of (40 ~ 50) MPa in sintering process, sintering temperature is 800 ~ 1100 DEG C, and sintering time is 10 ~ 15min.
2. utilize discharge plasma sintering legal system for the method for fine and close titanium aluminum alloy as claimed in claim 1, it is characterized in that:
Described titanium valve purity >=99.5%, granularity is 40 μm.
3. utilize discharge plasma sintering legal system for the method for fine and close titanium aluminum alloy as claimed in claim 1, it is characterized in that:
Described aluminium powder purity >=99.6%, granularity is 30 μm.
4. utilize discharge plasma sintering legal system for the method for fine and close titanium aluminum alloy as claimed in claim 1, it is characterized in that:
Described ball-milling medium is Stainless Steel Ball.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410739139.8A CN104451220A (en) | 2014-12-08 | 2014-12-08 | Method of preparing compact titanium-aluminium alloy by virtue of discharge plasma sintering method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410739139.8A CN104451220A (en) | 2014-12-08 | 2014-12-08 | Method of preparing compact titanium-aluminium alloy by virtue of discharge plasma sintering method |
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| Publication Number | Publication Date |
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| CN104451220A true CN104451220A (en) | 2015-03-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410739139.8A Pending CN104451220A (en) | 2014-12-08 | 2014-12-08 | Method of preparing compact titanium-aluminium alloy by virtue of discharge plasma sintering method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104911380A (en) * | 2015-06-09 | 2015-09-16 | 华南理工大学 | Preparation method of ultrafine-grain Ti-6Al-4V alloy |
| CN113233464A (en) * | 2021-06-03 | 2021-08-10 | 北京理工大学前沿技术研究院 | High-purity titanium aluminum carbide and preparation method and application thereof |
| CN115976367A (en) * | 2023-02-17 | 2023-04-18 | 浙江工业大学 | Rhenium alloying titanium-aluminum alloy and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101240382A (en) * | 2007-02-05 | 2008-08-13 | 中南大学 | Method for preparing high dense TiAl-base alloy |
| CN101245431A (en) * | 2008-03-25 | 2008-08-20 | 长春工业大学 | Gamma-group Ti-Al alloy material with high-temperature resistance oxidation and manufacture method thereof |
-
2014
- 2014-12-08 CN CN201410739139.8A patent/CN104451220A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101240382A (en) * | 2007-02-05 | 2008-08-13 | 中南大学 | Method for preparing high dense TiAl-base alloy |
| CN101245431A (en) * | 2008-03-25 | 2008-08-20 | 长春工业大学 | Gamma-group Ti-Al alloy material with high-temperature resistance oxidation and manufacture method thereof |
Non-Patent Citations (3)
| Title |
|---|
| 刘鹤等: "机械合金化Ti／Al 合金的制备", 《粉末冶金工业》 * |
| 孔凡涛等: "机械合金化与等离子烧结制备细晶TiAI合金", 《稀有金属材料与工程》 * |
| 王志伟: "Ti-Al-Al2O3纳米粉体的机械活化-放电等离子烧结", 《材料保护》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104911380A (en) * | 2015-06-09 | 2015-09-16 | 华南理工大学 | Preparation method of ultrafine-grain Ti-6Al-4V alloy |
| CN113233464A (en) * | 2021-06-03 | 2021-08-10 | 北京理工大学前沿技术研究院 | High-purity titanium aluminum carbide and preparation method and application thereof |
| CN115976367A (en) * | 2023-02-17 | 2023-04-18 | 浙江工业大学 | Rhenium alloying titanium-aluminum alloy and preparation method thereof |
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Application publication date: 20150325 |
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