CN100408714C - Mixing-reinforced magnesium-base self-lubricating composite material and preparing method - Google Patents
Mixing-reinforced magnesium-base self-lubricating composite material and preparing method Download PDFInfo
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- CN100408714C CN100408714C CNB03111122XA CN03111122A CN100408714C CN 100408714 C CN100408714 C CN 100408714C CN B03111122X A CNB03111122X A CN B03111122XA CN 03111122 A CN03111122 A CN 03111122A CN 100408714 C CN100408714 C CN 100408714C
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Abstract
The present invention relates to a magnesium base self-lubricating composite material formed by compounding magnesium and magnesium alloys as base materials with additive phases, and a preparation method thereof. The material is composed of magnesium base alloys and additive miscellaneous reinforcing phases, wherein the magnesium base alloys are prepared from the components by the following volume weight percentage: 5 to 10% of Al, 0.2 to 0.6% of Zn, 0.1 to 0.25% of Mn, 0 to 6% of Si, 0 to 1% Re, at most 0.01% of impurity, and magnesium as the rest; the additive miscellaneous reinforcing phases comprise the components by the following volume percentage: 5 to 15% of Al2O3 chopped fiber, and 5 to 20% of graphite. In the preparation method, firstly, a prefabricated part is prepared; then, a final composite material is prepared by a compacting casting method. The prepared composite material has the advantages of good tribological property, high wear resistant bearing capacity, small friction coefficient, simple production process and low production cost.
Description
Technical field
The present invention relates to a kind of is body material and add magnesium based self lubricated composite material that is composited mutually and preparation method thereof with magnesium and alloy thereof, particularly relates to Al
2O
3Staple fibre mixes enhancing self-lubricating composite and preparation method thereof with graphite granule for the magnesium base that adds mutually.
The technical background metal-base composites be with two or more material by being composited someway, purpose is more effectively to bring into play differing materials characteristic separately, and gives this material of single use not available good composite performance.In recent years, cheaply, prepare the development of simple relatively discontinuous reinforced composite, particularly particle or short fiber reinforced metal-base composite materials comparatively fast.Development along with automobile and space flight and aviation technology, with the light alloy is that matrix composite more and more demonstrates wide application prospect, but present research focuses mostly on aspect aluminum matrix composite, the preparation process of aluminum matrix composite, microtexture, mechanical property etc. have been carried out research extensively and profoundly, and the density of comparing MAGNESIUM METAL with aluminium is low (to be about 1.748/cm
3), be about 64% of aluminium, 20% of steel.Therefore, its specific tenacity is apparently higher than aluminium and steel, and is farther far above engineering plastics.The Young's modulus of magnesium is low, good shock resistance is arranged, in addition, magnesium has good machinability and anti-electromagnetic interference shielding performance and is easy to recovery, and, very abundant at Chinese reserves, be considered to the most promising now automobile lightweight material and " 3C " case material.
Have than magnesium alloy comprehensive performance with the discontinuous enhancing composite material of magnesium alloy that adds various forms of enhancing systems one-tenth, become an important field of research in the advanced metal-base composites.But both at home and abroad to discontinuous enhancing magnesium base composite material, especially the technology of preparing of mixing reinforced magnesium based composites is relative with performance study less.
Summary of the invention
The object of the present invention is to provide and a kind ofly be used to prepare magnesium alloy substrate and add Al
2O
3Mixing reinforced magnesium based self lubricated composite material of staple fibre and graphite granule and preparation method thereof.
Concrete technical scheme is:
The mixing reinforced magnesium based self lubricated composite material is made of the mass percent of the composition range of Magnuminium: Al 5-10%, Zn 0.2-0.6%, Mn 0.1-0.25%, Si 0-1%, R the wild phase that mixes of Magnuminium and interpolation
E0-1%, impurity≤0.01%, all the other are magnesium, the wild phase that mixes of interpolation is: Al
2O
3Staple fibre and graphite granule, Al
2O
3The add-on of staple fibre is percent by volume 5-15%, and the add-on percent by volume of graphite is 5-20%.
R
EFor light mishmetal or single rare earth, can be: La, Ce, Nd.
Al
2O
3The purity of staple fibre is more than 98.9%, and diameter is 8-12 μ m, and length is 300-700 μ m, and graphite particle size is:＜45 μ m, 76-88 μ m, 88-105 μ m and 300-450 μ m.
The preparation method of mixing reinforced magnesium based self lubricated composite material at first carries out the precast body preparation, adopts Squeeze Casting to prepare final matrix material then, and the technical process of precast body preparation is:
A) earlier to graphite granule and Al
2O
3Staple fibre adds water and mixes stirring, and speed is 150～450 rev/mins, and churning time is 5～30 minutes, adds binding agent simultaneously;
B) be pressed after sieving, pressing force is 0.05～5MPa during compacting, pressurize 5～30 minutes;
C) to the precast body oven drying at low temperature of moulding, the oven drying at low temperature temperature is 100～250 ℃;
D) to precast body hyperthermia drying in sealed vessel of moulding, Heating temperature is 650～950 ℃;
Adopt Squeeze Casting to prepare final matrix material, method is:
A) to mould and die preheating, mould adopts metal pattern, and preheating temperature is 200～350 ℃.
B) to precast body preheating in advance, preheating temperature is 250～550 ℃.
C) with magnesium alloy melting in electric furnace of preparation, pouring temperature is 600～800 ℃.
D) squeeze pressure is 30～100MPa, and the dwell time is 0.5～5 second.
The alloy of final preparation is: magnesium alloy+5-15%Al
2O
3Staple fibre+5-20% graphite, wherein percentage ratio is percent by volume.
Compared with the prior art the present invention has following effect: prepared matrix material has the excellent friction characteristic, and wear-resisting supporting capacity obviously improves, and frictional coefficient obviously reduces, and production technique is simple, and production cost is low.The mixing reinforced magnesium based self lubricated composite material that adopts the present technique preparation has improved more than 1.5 times than the supporting capacity of matrix magnesium alloy materials, and frictional coefficient drops to about 0.2 by original 0.5, and wear rate is starkly lower than the matrix magnesium alloy.
Description of drawings
Fig. 1 graphite particle size is magnesium alloy+8%Al of 76-88 μ m
2O
3+ 5% graphite self-lubricating matrix material metallographic structure;
Fig. 2 graphite particle size is magnesium alloy+8%Al of 76-88 μ m
2O
3+ 10% graphite self-lubricating matrix material metallographic structure;
Fig. 3 graphite particle size is magnesium alloy+8%Al of 76-88 μ m
2O
3+ 15% graphite self-lubricating matrix material metallographic structure;
Fig. 4 graphite particle size is magnesium alloy+8%Al of 76-88 μ m
2O
3+ 20% graphite self-lubricating matrix material metallographic structure;
Fig. 5 graphite particle size is magnesium alloy/Al of＜45 μ m
2O
3+ 15% graphite self-lubricating matrix material metallographic structure;
Fig. 6 graphite particle size is magnesium alloy/Al of 88-105 μ m
2O
3+ 15% graphite self-lubricating matrix material metallographic structure;
Fig. 7 graphite particle size is magnesium alloy/Al of 300-450 μ m
2O
3+ 15% graphite self-lubricating matrix material metallographic structure;
Fig. 8 is the scanning electron microscope pattern of the stretching fracture (unsticking of fiber) of mixing reinforced magnesium based self lubricated composite material, the Al that extracts when rupturing as can be seen among this figure
2O
3Fiber and broken fiber;
Fig. 9 is the scanning electron microscope pattern of the stretching fracture (fracture of fiber and the state of graphite) of mixing reinforced magnesium based self lubricated composite material, by the graphite granule of incision position and the Al that breaks as can be seen among this figure
2O
3Staple fibre;
Figure 10 content of graphite is to effects of tensile strength (graphite particle size is 76-88 μ m);
Figure 11 content of graphite is to the influence (graphite particle size is 76-88 μ m) of unit elongation;
Figure 12 variation relation of mass loss that wear and tear with load;
The variation relation of Figure 13 The friction coefficient load;
Figure 14 graphite particle size is to effects of tensile strength (content of graphite is 15%);
Figure 15 graphite particle size is to the influence (content of graphite is 15%) of unit elongation;
Figure 16 graphite particle size is to the influence (content of graphite is 15%) of worn composite amount;
Figure 17 graphite particle size is to the influence (content of graphite is 15%) of friction coefficient of composite material;
The technical process of Figure 18 precast body preparation;
Embodiment
Illustrated embodiment further specifies the details of the technology of the present invention in conjunction with the accompanying drawings.But this only is several examples wherein, rather than all.
Example 1: mix with the magnesium base of the different content of graphite of method for preparing and to strengthen self-lubricating composite and consult table 1:
The chemical ingredients of table 1 first series alloy (the graphite size is 76-88 μ m)
Content of graphite is consulted Figure 10 and Figure 11 to the influence of tensile strength and unit elongation.Content of graphite is consulted Figure 12 to the influence of polishing machine, and content of graphite is consulted Figure 13 to the influence of frictional behaviour, can find out the increase with graphite particle content from Figure 10 and 11, and the tensile strength of matrix material and unit elongation are all on a declining curve.As can be seen from Figure 12, compare basic alloy, mixing the wear resistance that strengthens self-lubricating composite obviously improves, and engender-the stabilised platform district with the content of graphite increase, show that wear-resisting supporting capacity obviously improves, bring up to (matrix material that contains 20% graphite) about 180N from about 40N of basic alloy, simultaneously because the adding of graphite, the frictional coefficient of self-lubricating composite also obviously reduces, drop to (matrix material that contains 20% graphite) below 0.2 from about 0.5 of basic alloy, consult Figure 13.
Example 2: mix with the magnesium base of the different graphite particle sizes of method for preparing and to strengthen self-lubricating composite and consult table 2:
The chemical ingredients of table 2 second series alloy
Graphite particle size is consulted Figure 14 to effects of tensile strength, and graphite particle size is consulted Figure 15 to the influence of unit elongation, and graphite particle size is consulted Figure 16 to the influence of polishing machine, and graphite particle size is consulted Figure 17 to the influence of frictional behaviour.By Figure 14 and Figure 15 as can be seen, the tensile strength of matrix material and unit elongation increase with the increase of the graphite particle size that adds, as seen from Figure 16, the wear rate of matrix material (mass loss) reduces with the increase of graphite granule, as seen from Figure 17, the variation of graphite particle size is little to the influence of friction coefficient of composite material, but trends towards descending with the granularity increase.
Claims (3)
1. the mixing reinforced magnesium based self lubricated composite material is made up of the wild phase that mixes of Magnuminium and interpolation, it is characterized in that the mass percent of the composition range of Magnuminium: Al 5-10%, Zn 0.2-0.6%, Mn 0.1-0.25%, Si 0-1%, R
E0-1%, impurity≤0.01%, all the other are magnesium, R
EBe light mishmetal or the single rare earth that is selected from the interpolation of La, Ce, Nd, mix wild phase and be: Al
2O
3Staple fibre and graphite granule, Al
2O
3The add-on percent by volume of staple fibre is 5-15%, and the add-on percent by volume of graphite is 5-20%.
2. mixing reinforced magnesium based self lubricated composite material according to claim 1 is characterized in that Al
2O
3The purity of staple fibre is more than 98.9%, and diameter is 8-12 μ m, and length is 300-700 μ m, and graphite particle size is:＜45 μ m, 76-88 μ m, 88-105 μ m or 300-450 μ m.
3. the preparation method of mixing reinforced magnesium based self lubricated composite material according to claim 1 is characterized in that at first carrying out the precast body preparation, adopts Squeeze Casting to prepare final matrix material then, and the technical process of precast body preparation is:
A) earlier to graphite granule and Al
2O
3Staple fibre adds water and mixes stirring, and speed is 150～450 rev/mins, and churning time is 5～30 minutes, adds binding agent simultaneously;
B) be pressed after sieving, pressing force is 0.05～5MPa during compacting, pressurize 5～30 minutes;
C) to the precast body oven drying at low temperature of moulding, the oven drying at low temperature temperature is 100～250 ℃;
D) to precast body hyperthermia drying in sealed vessel of moulding, Heating temperature is 650～950 ℃;
Adopt Squeeze Casting to prepare final matrix material, method is:
A) to mould and die preheating, mould adopts metal pattern, and preheating temperature is 200～350 ℃;
B) to precast body preheating in advance, preheating temperature is 250～550 ℃;
C) with magnesium alloy melting in electric furnace of preparation, pouring temperature is 600～800 ℃;
D) squeeze pressure is 30～100MPa, and the dwell time is 0.5～5 minute.
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| CNB03111122XA CN100408714C (en) | 2003-03-04 | 2003-03-04 | Mixing-reinforced magnesium-base self-lubricating composite material and preparing method |
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| CN100408714C true CN100408714C (en) | 2008-08-06 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1318625C (en) * | 2005-03-31 | 2007-05-30 | 上海交通大学 | Copper-plated graphite granule reinforced magnesium base composite material |
| CN100410413C (en) * | 2006-12-21 | 2008-08-13 | 上海交通大学 | Carbon fiber mixing reinforced magnesium-base high modulus composite material and its preparing process |
| CN102051539B (en) * | 2011-01-14 | 2012-08-22 | 南京信息工程大学 | Heat-resistant magnesium alloy material and preparation method thereof |
| CN102051535B (en) * | 2011-01-14 | 2012-08-22 | 南京信息工程大学 | Damping abrasion resistant magnesium alloy material and preparation method thereof |
| CN102191443B (en) * | 2011-05-16 | 2013-05-08 | 西安理工大学 | Preparation method of alumina fiber reinforced magnesium-matrix composite |
| CN107964616A (en) * | 2017-11-28 | 2018-04-27 | 宁波市鄞州隆茂冲压件厂 | A kind of rail mounting bracket |
| CN107841666A (en) * | 2017-11-29 | 2018-03-27 | 宁波市鄞州隆茂冲压件厂 | A kind of support |
| CN107937781B (en) * | 2017-11-29 | 2020-08-07 | 宁波晋畅机电科技有限公司 | Corrosion-resistant support |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1345382A (en) * | 1999-12-21 | 2002-04-17 | 日立金属株式会社 | Method for producing metal-based composite material |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1345382A (en) * | 1999-12-21 | 2002-04-17 | 日立金属株式会社 | Method for producing metal-based composite material |
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