CN103484702A - Cr2AlC-granule-reinforced Zn-base composite material and preparation method thereof - Google Patents
Cr2AlC-granule-reinforced Zn-base composite material and preparation method thereof Download PDFInfo
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Abstract
The invention relates to a metal-base composite material, particularly a Cr2AlC-granule-reinforced Zn-base composite material and a preparation method thereof. In the Cr2AlC-granule-reinforced Zn-base composite material, the base metal powder is zinc powder of which the particle size is 20-50 mu m; the content of the second phase reinforcer Cr2AlC powder is 1-30%; the particle size of the second phase reinforcer Cr2AlC powder is 0.1-30 mu m; and the second phase reinforcer Cr2AlC powder is prepared by non-pressure sintering. The preparation method comprises the following steps: respectively carrying out ball milling on the Cr2AlC powder and zinc powder, and uniformly mixing the two powder phases; and drying the uniformly mixed powder, and carrying out hot press sintering in a graphite jig while introducing argon as a protective gas, thereby obtaining the Cr2AlC-granule-reinforced Zn-base composite material. The composite material has the advantages of high heat resistance, high tensile strength, high creep strength and favorable friction and wear resistance. The preparation method has the advantages of simple technique and mild conditions.
Description
Technical field
The present invention relates to metal-base composites, specifically a kind of Cr
2the AlC particle strengthens Zn based composites and preparation method thereof.
Technical background
Metal-base composites is the development of modern high-and-new science and technology and a key areas of application, has both had advantages of matrix, has both again and introduces the characteristic that wild phase produces, as high specific strength, high specific stiffness, high than characteristics such as toughness, high temperature resistant, antifatigues.Wherein, studying more is the metal-base composites such as aluminium base, magnesium base and copper base.For a long time, the application of Zinc-base compounded material is not general, major cause is that zinc alloy has had superior mechanical property, good low temperature castability and machinability, but zinc alloy exists thermotolerance poor, fusing point is lower, the shortcomings such as tension and creep strength are low, work-ing life is short, and Zinc-base compounded material can overcome the weakness such as the poor and thermal expansivity of zinc alloy resistance to elevated temperatures is large, has boundless application prospect.
In the research and preparation process of matrix material, the size of the wild phase of interpolation, shape, distribution and very large to novel metal based composites performance impact with the bonding strength at interface.Cr
2alC is a kind of in mutually of ternary layered compound MAX, and it combines can and ceramic advantage, as high heat conductance, and high conductivity, heat shock resistance and anti-oxidant anticorrosive etc.Especially its thermal expansivity and metal are close, make it be suitable as very much the reinforcement of metal-base composites.And Cr
2the preparation method of AlC powder is simple, with low cost.The Cr made on this basis
2it is better that the AlC particle strengthens Zn based composites thermotolerance, tensile strength is high, creep strength is high, wear resistance is good, and with low cost, be as the special wear parts such as cold punching die, transmitting gear and the higher bearing bush of use temperature and improve the workpiece good material in work-ing life.
Chinese patent CN102337423A discloses a kind of preparation method of ceramic-powder-enhanced zinc-aluminum alloy based composite material, the matrix adopting Zn-Al alloy powder, and the reinforcement ceramic powder is selected from SiC, Al
2o
3, ZrO
2, TiC, B
4c, Si
3n4, Cr
2o
3in at least one, the matrix alloy fusing point is lower, non-refractory.Chinese patent CN101368237A discloses a kind of preparation method of silicon particle reinforced zinc based composite material, utilize Al-Si alloy and Zn or Zn-Al alloy to carry out melt-mixing, and forming the Zinc-base compounded material of silicon enhanced granule in process of cooling, it is comparatively complicated that the method reinforcement is produced process.
Summary of the invention
The object of the invention is to overcome that the zinc alloy thermotolerance is poor, fusing point is lower, tension and the shortcoming such as creep strength is low, work-ing life is short, a kind of Cr is provided
2the AlC particle strengthens Zn based composites and preparation method thereof.
Described Cr
2the AlC particle strengthens in the Zn based composites, and the matrix metal powder is zinc powder, and the size of zinc powder is 20～50 μ m; Second-phase reinforcement Cr
2the AlC content of powder is 1%～30%, second-phase reinforcement Cr
2the size of AlC powder is 0.1～30 μ m, and the method by pressureless sintering makes.
Described Cr
2the preparation method that the AlC particle strengthens the Zn based composites is as follows:
1) respectively by Cr
2alC powder and zinc powder ball milling, mix the two-phase powder;
2) after the powder mixed is dried, be placed on hot pressed sintering in graphite jig, pass into argon gas in sintering process as shielding gas, obtain Cr
2the AlC particle strengthens the Zn based composites.
In step 1), described ball milling can adopt planetary ball mill ball milling 12h.
In step 2) in, the diameter of described graphite jig can be 30～50mm; The condition of described hot pressed sintering can be: temperature is 280～400 ℃, and pressure is 20～50MPa, and insulation and dwell time are 30～90min.
The Cr that the present invention is prepared
2it is better that the AlC particle strengthens Zn based composites thermotolerance, tensile strength is high, creep strength is high, has good wear resistance, is as the special wear parts such as cold stamping grinding tool, transmitting gear and the higher bearing bush of use temperature and improves the workpiece good material in work-ing life.In addition, preparation method's technique is simple, mild condition.
The accompanying drawing explanation
Fig. 1 is the optical microscopy map of the embodiment of the present invention 6 under 200 times.
The compression testing stress-strain figure that Fig. 2 is the embodiment of the present invention 6.
The SEM figure of the compression testing surface of fracture that Fig. 3 is the embodiment of the present invention 6.
The XRD figure that Fig. 4 is the embodiment of the present invention 10.
Embodiment
Embodiment 1: a kind of Cr of the present invention
2the AlC particle strengthens Zn based composites, the Cr that is 1% by volume percent
2the pure zinc powder that AlC powder and volume percent are 99% mixes, sintering in the hot-pressed sintering furnace that is connected with shielding gas Ar, and hot pressing temperature is for being made as 280 ℃, and pressure is 50MPa, and soaking time is 60min.
Embodiment 2: a kind of Cr of the present invention
2the AlC particle strengthens Zn based composites, the Cr that is 2% by volume percent
2the pure zinc powder that AlC powder and volume percent are 98% mixes, sintering in the hot-pressed sintering furnace that is connected with shielding gas Ar, and hot pressing temperature is for being made as 300 ℃, and pressure is 45MPa, and soaking time is 50min.
Embodiment 3: a kind of Cr of the present invention
2the AlC particle strengthens Zn based composites, the Cr that is 3% by volume percent
2the pure zinc powder that AlC powder and volume percent are 97% mixes, sintering in the hot-pressed sintering furnace that is connected with shielding gas Ar, and hot pressing temperature is for being made as 320 ℃, and pressure is 48MPa, and soaking time is 45min.
Embodiment 4: a kind of Cr of the present invention
2the AlC particle strengthens Zn based composites, the Cr that is 4% by volume percent
2the pure zinc powder that AlC powder and volume percent are 96% mixes, sintering in the hot-pressed sintering furnace that is connected with shielding gas Ar, and hot pressing temperature is for being made as 340 ℃, and pressure is 40MPa, and soaking time is 30min.
Embodiment 5: a kind of Cr of the present invention
2the AlC particle strengthens Zn based composites, the Cr that is 5% by volume percent
2the pure zinc powder that AlC powder and volume percent are 95% mixes, sintering in the hot-pressed sintering furnace that is connected with shielding gas Ar, and hot pressing temperature is for being made as 350 ℃, and pressure is 35MPa, and soaking time is 40min.
Embodiment 6: a kind of Cr of the present invention
2the AlC particle strengthens Zn based composites, the Cr that is 10% by volume percent
2the pure zinc powder that AlC powder and volume percent are 90% mixes, sintering in the hot-pressed sintering furnace that is connected with shielding gas Ar, and hot pressing temperature is for being made as 360 ℃, and pressure is 40MPa, and soaking time is 60min.
Experiment confirms, reinforcement Cr
2when the content of AlC is 1%～10%, the hardness mean value of matrix material is 69.7HV, than the hardness of the pure zinc under equal conditions, improves 7.56%.Compressed rupture strength is 230MPa, than the intensity of the pure zinc under equal conditions, improves 15%.
As can be seen from Figure 1, wild phase Cr
2the AlC uniform particles is distributed in matrix.
Fig. 2 has confirmed that this matrix material has good compression property.
The crackle of the surface of fracture of Fig. 3 shows the brittle rupture that is fractured into of material.
Embodiment 7: a kind of Cr2AlC particle of the present invention strengthens Zn based composites, the Cr that is 15% by volume percent
2the pure zinc powder that AlC powder and volume percent are 85% mixes, sintering in the hot-pressed sintering furnace that is connected with shielding gas Ar, and hot pressing temperature is for being made as 380 ℃, and pressure is 20MPa, and soaking time is 30min.
Experiment confirms, reinforcement Cr
2when the content of AlC is 15%, the hardness mean value of matrix material is 85.9HV, than the hardness of the pure zinc under equal conditions, improves 30.67%.Compressed rupture strength is 250MPa, than the intensity of the pure zinc under equal conditions, improves 25%.
Embodiment 8: a kind of Cr2AlC particle of the present invention strengthens Zn based composites, the Cr that is 20% by volume percent
2the pure zinc powder that AlC powder and volume percent are 80% mixes, sintering in the hot-pressed sintering furnace that is connected with shielding gas Ar, and hot pressing temperature is for being made as 400 ℃, and pressure is 25MPa, and soaking time is 90min.
Experiment confirms, reinforcement Cr
2when the content of AlC is 20%, the hardness mean value of matrix material is 78.5HV, than the hardness of the pure zinc under equal conditions, improves 21.14%.
Embodiment 9: a kind of Cr2AlC particle of the present invention strengthens Zn based composites, the Cr that is 25% by volume percent
2the pure zinc powder that AlC powder and volume percent are 75% mixes, sintering in the hot-pressed sintering furnace that is connected with shielding gas Ar, and hot pressing temperature is for being made as 350 ℃, and pressure is 20MPa, and soaking time is 75min.
Experiment confirms, reinforcement Cr
2when the content of AlC is 25%, the hardness mean value of matrix material is 70.97HV, than the hardness of the pure zinc under equal conditions, improves 9.5%.
Embodiment 10: a kind of Cr2AlC particle of the present invention strengthens Zn based composites, the Cr that is 30% by volume percent
2the pure zinc powder that AlC powder and volume percent are 70% mixes, sintering in the hot-pressed sintering furnace that is connected with shielding gas Ar, and hot pressing temperature is for being made as 380 ℃, and pressure is 30MPa, and soaking time is 70min.
Experiment confirms, reinforcement Cr
2when the content of AlC is 30%, the hardness mean value of matrix material is 77.7HV, than the hardness of the pure zinc under equal conditions, improves 19.91%.
Fig. 4 shows, in matrix material, principal phase is matrix Zn, wild phase Cr
2alC is undecomposed.
Claims (5)
1. a Cr
2the AlC particle strengthens the Zn based composites, it is characterized in that described Cr
2the AlC particle strengthens in the Zn based composites, and the matrix metal powder is zinc powder, and the size of zinc powder is 20～50 μ m; Second-phase reinforcement Cr
2the AlC content of powder is 1%～30%, second-phase reinforcement Cr
2the size of AlC powder is 0.1～30 μ m, and the method by pressureless sintering makes.
2. a kind of Cr as claimed in claim 1
2the AlC particle strengthens the preparation method of Zn based composites, it is characterized in that comprising the following steps:
1) respectively by Cr
2alC powder and zinc powder ball milling, mix the two-phase powder;
2) after the powder mixed is dried, be placed on hot pressed sintering in graphite jig, pass into argon gas in sintering process as shielding gas, obtain Cr
2the AlC particle strengthens the Zn based composites.
3. a kind of Cr as claimed in claim 2
2the AlC particle strengthens the preparation method of Zn based composites, it is characterized in that in step 1), and described ball milling adopts planetary ball mill ball milling 12h.
4. a kind of Cr as claimed in claim 2
2the AlC particle strengthens the preparation method of Zn based composites, it is characterized in that in step 2) in, the diameter of described graphite jig is 30～50mm.
5. a kind of Cr as claimed in claim 2
2the AlC particle strengthens the preparation method of Zn based composites, it is characterized in that in step 2) in, the condition of described hot pressed sintering is: temperature is 280～400 ℃, and pressure is 20～50MPa, and insulation and dwell time are 30～90min.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104928511A (en) * | 2015-06-30 | 2015-09-23 | 中南大学 | Hot pressing sintering particle reinforcing zinc-based composite material and preparation method thereof |
| CN105834414A (en) * | 2016-03-18 | 2016-08-10 | 苏州莱特复合材料有限公司 | Graphene zinc-based composite and preparation method thereof |
| CN115286401A (en) * | 2022-06-29 | 2022-11-04 | 武汉科技大学 | Cr (chromium) 2 AlC combined silicon carbide refractory material and preparation method thereof |
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| US7553564B2 (en) * | 2004-05-26 | 2009-06-30 | Honeywell International Inc. | Ternary carbide and nitride materials having tribological applications and methods of making same |
| CN102181766A (en) * | 2010-12-31 | 2011-09-14 | 陕西科技大学 | A (Ti, cr)2AlC solid solution composite material and its prepn |
| CN102242302A (en) * | 2011-06-28 | 2011-11-16 | 钢铁研究总院 | Preparation method of layered ternary ceramic reinforced copper composite material |
| CN103273057A (en) * | 2013-05-28 | 2013-09-04 | 哈尔滨工业大学 | Cr2AlC reinforced bronze-based brake pad material used for high-speed railway and preparation method thereof |
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2013
- 2013-10-17 CN CN201310488066.5A patent/CN103484702B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7553564B2 (en) * | 2004-05-26 | 2009-06-30 | Honeywell International Inc. | Ternary carbide and nitride materials having tribological applications and methods of making same |
| CN102181766A (en) * | 2010-12-31 | 2011-09-14 | 陕西科技大学 | A (Ti, cr)2AlC solid solution composite material and its prepn |
| CN102242302A (en) * | 2011-06-28 | 2011-11-16 | 钢铁研究总院 | Preparation method of layered ternary ceramic reinforced copper composite material |
| CN103273057A (en) * | 2013-05-28 | 2013-09-04 | 哈尔滨工业大学 | Cr2AlC reinforced bronze-based brake pad material used for high-speed railway and preparation method thereof |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104928511A (en) * | 2015-06-30 | 2015-09-23 | 中南大学 | Hot pressing sintering particle reinforcing zinc-based composite material and preparation method thereof |
| CN105834414A (en) * | 2016-03-18 | 2016-08-10 | 苏州莱特复合材料有限公司 | Graphene zinc-based composite and preparation method thereof |
| CN115286401A (en) * | 2022-06-29 | 2022-11-04 | 武汉科技大学 | Cr (chromium) 2 AlC combined silicon carbide refractory material and preparation method thereof |
| CN115286401B (en) * | 2022-06-29 | 2023-03-31 | 武汉科技大学 | Cr (chromium) 2 AlC combined silicon carbide refractory material and preparation method thereof |
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