CN103484702B - 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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- CN103484702B CN103484702B CN201310488066.5A CN201310488066A CN103484702B CN 103484702 B CN103484702 B CN 103484702B CN 201310488066 A CN201310488066 A CN 201310488066A CN 103484702 B CN103484702 B CN 103484702B
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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
2alC particle reinforce Zn based composites and preparation method thereof.
Technical background
Metal-base composites is a key areas of modern high-and-new science and technology development and apply, has both had the advantage of matrix, has both again and introduces the characteristic that produces of wild phase, as high specific strength, high specific stiffness, high than characteristics such as toughness, high temperature resistant, antifatigues.Wherein, studying more is aluminium base, the metal-base composites such as 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 it is poor to there is thermotolerance in zinc alloy, fusing point is lower, tension and the shortcoming such as creep strength is low, work-ing life is short, and the weakness such as Zinc-base compounded material can overcome zinc alloy resistance to elevated temperatures difference and thermal expansivity is large, have 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 the one in ternary layered compound MAX phase, it combines the advantage of can and pottery, as high heat conductance, and high conductivity, heat shock resistance and anti-oxidant anticorrosive etc.Especially its thermal expansivity is close with metal, makes 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.Cr obtained on this basis
2alC particle reinforce Zn based composites thermotolerance is better, tensile strength is high, creep strength is high, wear resistance is good, and with low cost, be the good material being used as the special wear parts such as the higher bearing bush of cold punching die, transmitting gear and use temperature and improving workpiece work-ing life.
Chinese patent CN102337423A discloses a kind of preparation method of ceramic-powder-enhanced zinc-aluminum alloy based composite material, and matrix adopts Zn-Al alloy powder, and reinforcement ceramic powder is selected from SiC, Al
2o
3, ZrO
2, TiC, B
4c, Si
3n4, Cr
2o
3in at least one, 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, Al-Si alloy and Zn or Zn-Al alloy is utilized to carry out melt-mixing, and in process of cooling, forming the Zinc-base compounded material of silicon enhanced granule, the method reinforcement producing process is comparatively complicated.
Summary of the invention
The object of the invention is to overcome that 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
2alC particle reinforce Zn based composites and preparation method thereof.
Described Cr
2in AlC particle reinforce Zn based composites, matrix metal powder is zinc powder, and the size of zinc powder is 20 ~ 50 μm; Second-phase reinforcement Cr
2alC content of powder is 1% ~ 30%, second-phase reinforcement Cr
2the size of AlC powder is 0.1 ~ 30 μm, is obtained by the method for pressureless sintering.
Described Cr
2the preparation method of AlC particle reinforce Zn based composites is as follows:
1) respectively by Cr
2alC powder and zinc powder ball milling, make two-phase powder mix;
2), after the powder mixed being dried, be placed on hot pressed sintering in graphite jig, pass into argon gas in sintering process as shielding gas, obtain Cr
2alC particle reinforce 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 DEG C, and pressure is 20 ~ 50MPa, and insulation and dwell time are 30 ~ 90min.
Cr prepared by the present invention
2alC particle reinforce Zn based composites thermotolerance is better, tensile strength is high, creep strength is high, has good wear resistance, is the good material being used as the special wear parts such as the higher bearing bush of cold stamping grinding tool, transmitting gear and use temperature and improving workpiece work-ing life.In addition, preparation method's technique is simple, mild condition.
Accompanying drawing explanation
Fig. 1 is the optical microscopy map of the embodiment of the present invention 6 under 200 times.
Fig. 2 is the compression testing stress-strain figure of the embodiment of the present invention 6.
Fig. 3 is the SEM figure of the compression testing surface of fracture of the embodiment of the present invention 6.
Fig. 4 is the XRD figure of the embodiment of the present invention 10.
Embodiment
Embodiment 1: a kind of Cr of the present invention
2volume percent is the Cr of 1% by AlC particle reinforce Zn based composites
2alC powder and volume percent be 99% pure zinc powder mix, sinter in the hot-pressed sintering furnace being connected with shielding gas Ar, hot pressing temperature is for being set to 280 DEG C, and pressure is 50MPa, and soaking time is 60min.
Embodiment 2: a kind of Cr of the present invention
2volume percent is the Cr of 2% by AlC particle reinforce Zn based composites
2alC powder and volume percent be 98% pure zinc powder mix, sinter in the hot-pressed sintering furnace being connected with shielding gas Ar, hot pressing temperature is for being set to 300 DEG C, and pressure is 45MPa, and soaking time is 50min.
Embodiment 3: a kind of Cr of the present invention
2volume percent is the Cr of 3% by AlC particle reinforce Zn based composites
2alC powder and volume percent be 97% pure zinc powder mix, sinter in the hot-pressed sintering furnace being connected with shielding gas Ar, hot pressing temperature is for being set to 320 DEG C, and pressure is 48MPa, and soaking time is 45min.
Embodiment 4: a kind of Cr of the present invention
2volume percent is the Cr of 4% by AlC particle reinforce Zn based composites
2alC powder and volume percent be 96% pure zinc powder mix, sinter in the hot-pressed sintering furnace being connected with shielding gas Ar, hot pressing temperature is for being set to 340 DEG C, and pressure is 40MPa, and soaking time is 30min.
Embodiment 5: a kind of Cr of the present invention
2volume percent is the Cr of 5% by AlC particle reinforce Zn based composites
2alC powder and volume percent be 95% pure zinc powder mix, sinter in the hot-pressed sintering furnace being connected with shielding gas Ar, hot pressing temperature is for being set to 350 DEG C, and pressure is 35MPa, and soaking time is 40min.
Embodiment 6: a kind of Cr of the present invention
2volume percent is the Cr of 10% by AlC particle reinforce Zn based composites
2alC powder and volume percent be 90% pure zinc powder mix, sinter in the hot-pressed sintering furnace being connected with shielding gas Ar, hot pressing temperature is for being set to 360 DEG C, 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, improves 7.56% than the hardness of the pure zinc under equal conditions.Compressed rupture strength is 230MPa, improves 15% than the intensity of the pure zinc under equal conditions.
As can be seen from Figure 1, wild phase Cr
2the distribution of AlC uniform particles in the base.
Fig. 2 confirms that this matrix material has good compression property.
What the crackle of the surface of fracture of Fig. 3 showed material is fractured into brittle rupture.
Embodiment 7: volume percent is the Cr of 15% by a kind of Cr2AlC particle reinforce of the present invention Zn based composites
2alC powder and volume percent be 85% pure zinc powder mix, sinter in the hot-pressed sintering furnace being connected with shielding gas Ar, hot pressing temperature is for being set to 380 DEG C, 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, improves 30.67% than the hardness of the pure zinc under equal conditions.Compressed rupture strength is 250MPa, improves 25% than the intensity of the pure zinc under equal conditions.
Embodiment 8: volume percent is the Cr of 20% by a kind of Cr2AlC particle reinforce of the present invention Zn based composites
2alC powder and volume percent be 80% pure zinc powder mix, sinter in the hot-pressed sintering furnace being connected with shielding gas Ar, hot pressing temperature is for being set to 400 DEG C, 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, improves 21.14% than the hardness of the pure zinc under equal conditions.
Embodiment 9: volume percent is the Cr of 25% by a kind of Cr2AlC particle reinforce of the present invention Zn based composites
2alC powder and volume percent be 75% pure zinc powder mix, sinter in the hot-pressed sintering furnace being connected with shielding gas Ar, hot pressing temperature is for being set to 350 DEG C, 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, improves 9.5% than the hardness of the pure zinc under equal conditions.
Embodiment 10: volume percent is the Cr of 30% by a kind of Cr2AlC particle reinforce of the present invention Zn based composites
2alC powder and volume percent be 70% pure zinc powder mix, sinter in the hot-pressed sintering furnace being connected with shielding gas Ar, hot pressing temperature is for being set to 380 DEG C, 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, improves 19.91% than the hardness of the pure zinc under equal conditions.
Fig. 4 shows, in matrix material, principal phase is matrix Zn, wild phase Cr
2alC is undecomposed.
Claims (5)
1. a Cr
2alC particle reinforce Zn based composites, is characterized in that described Cr
2in AlC particle reinforce Zn based composites, matrix metal powder is zinc powder, and the size of zinc powder is 20 ~ 50 μm; Second-phase reinforcement Cr
2alC content of powder by volume per-cent is 1% ~ 30%, second-phase reinforcement Cr
2the size of AlC powder is 0.1 ~ 30 μm, is obtained by the method for hot pressed sintering.
2. a kind of Cr as claimed in claim 1
2the preparation method of AlC particle reinforce Zn based composites, is characterized in that comprising the following steps:
1) respectively by Cr
2alC powder and zinc powder ball milling, make two-phase powder mix;
2), after the powder mixed being dried, be placed on hot pressed sintering in graphite jig, pass into argon gas in sintering process as shielding gas, obtain Cr
2alC particle reinforce Zn based composites.
3. a kind of Cr as claimed in claim 2
2the preparation method of AlC particle reinforce Zn based composites, is characterized in that in step 1) in, described ball milling adopts planetary ball mill ball milling 12h.
4. a kind of Cr as claimed in claim 2
2the preparation method of AlC particle reinforce Zn based composites, 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 preparation method of AlC particle reinforce Zn based composites, is characterized in that in step 2) in, the condition of described hot pressed sintering is: temperature is 280 ~ 400 DEG C, and pressure is 20 ~ 50MPa, and insulation and dwell time are 30 ~ 90min.
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| CN103484702B true CN103484702B (en) | 2015-04-22 |
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| CN104928511B (en) * | 2015-06-30 | 2017-06-23 | 中南大学 | A kind of hot pressed sintering particle reinforced 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 |
| 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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| 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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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 |
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