CN111545726A - Directional Ti3SiC2Reinforced magnesium-based composite material cylinder block and preparation method thereof - Google Patents

Directional Ti3SiC2Reinforced magnesium-based composite material cylinder block and preparation method thereof Download PDF

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Publication number
CN111545726A
CN111545726A CN202010581550.2A CN202010581550A CN111545726A CN 111545726 A CN111545726 A CN 111545726A CN 202010581550 A CN202010581550 A CN 202010581550A CN 111545726 A CN111545726 A CN 111545726A
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China
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sic
cylinder
magnesium
cylinder sleeve
composite material
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于文波
皮旭锋
黄振莺
李翠伟
李世波
周洋
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Beijing Jiaotong University
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Beijing Jiaotong University
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D19/00—Casting in, on, or around objects which form part of the product
    • B22D19/08—Casting in, on, or around objects which form part of the product for building-up linings or coverings, e.g. of anti-frictional metal
    • B22D19/085—Casting in, on, or around objects which form part of the product for building-up linings or coverings, e.g. of anti-frictional metal of anti-frictional metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D18/00—Pressure casting; Vacuum casting
    • B22D18/02—Pressure casting making use of mechanical pressure devices, e.g. cast-forging
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/10—Alloys containing non-metals
    • C22C1/1036—Alloys containing non-metals starting from a melt
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/10—Alloys containing non-metals
    • C22C1/1036—Alloys containing non-metals starting from a melt
    • C22C1/1047—Alloys containing non-metals starting from a melt by mixing and casting liquid metal matrix composites
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C23/00—Alloys based on magnesium

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Composite Materials (AREA)
  • Powder Metallurgy (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)

Abstract

The invention discloses a directional Ti3SiC2A cylinder block of a ceramic particle reinforced magnesium-based composite material. Ti with wear-resisting self-lubricating property preheated to 60 DEG C3SiC2Adding the ceramic powder into a high-speed stirred semi-solid AE44 magnesium alloy, heating the melt to 700 ℃, preserving the heat for 10mins, and cooling to 500 ℃ again to obtain a semi-solid blank. And (2) putting the blank with the temperature of 500 ℃ into a press, carrying out hot back extrusion at the speed of 0.05-0.5mm/s to obtain a tubular cylinder sleeve blank, and carrying out rough turning, rough boring, turning process excircle, fine boring and finish turning excircle, rough honing, fine honing and platform honing on the tubular cylinder sleeve blank in sequence to obtain the magnesium-based cylinder sleeve finished product.And (3) placing the cylinder sleeve in a developed die-casting die and performing die-casting by adopting AE44 magnesium alloy to obtain the cylinder body. The ceramic reinforced magnesium-based cylinder body has the characteristic of low density, and has no phenomenon of furrow and particle shedding on the surface after the cylinder sleeve is rubbed as shown in the attached drawing of the abstract.

Description

Directional Ti3SiC2Reinforced magnesium-based composite material cylinder block and preparation method thereof
Technical Field
The invention relates to a directional Ti3SiC2A ceramic reinforced magnesium-based composite material cylinder body and a preparation method thereof.
Background
Magnesium alloy is the lightest metal structure material in the world, and has important application value and wide development prospect in the competitive field of light weight and low emission in the automobile industry (reference: Wu culture, Chinese energy 2007.29[10 ]). Magnesium alloys have low absolute strength, especially poor high temperature performance, which limits their use in engine parts and transmission parts, such as cylinder liners, bushings, etc. Studies have shown that the only way to pursue magnesium alloys that are heat resistant and have wear resistant properties is through compounding (ref: Mortensen, A.and J.Llorca, Materials Today,2010.9[6]: P.1-16). Namely, the 'reinforcement/functional body' is added in the magnesium alloy, and the performance of the material is comprehensively improved by reasonably regulating and controlling the interface, the tissue structure and the like on the basis of utilizing the intrinsic performance of different material components. The magnesium-based composite material has a series of advantages of high specific strength, high specific modulus, small density, good thermal stability and the like, simultaneously has good damping performance and electromagnetic shielding performance, and is considered to be a light metal composite material with extremely strong influence after an aluminum-based composite material. Because the automobile has the influence of vibration and friction in the driving process, the development of the Mg-based composite material with high specific strength, high specific rigidity, excellent damping, shock absorption and noise reduction performance and wear-resisting and self-lubricating characteristics becomes a research hotspot.
Automotive cylinder liners are required to transmit forces as well as to withstand high surface speeds, which requires that the liner material be of a soft composition to achieve good running properties, such as running-in, compliance and as little bite tendency as possible, and be less vulnerable to damage by foreign matter; and a hard component to achieve good wear resistance and fatigue resistance. Therefore, a metallographic structure with soft and hard component crystal grains distributed as uniformly as possible is created, and the method is a reasonable way for improving the performance of the bushing. In order to replace the cast iron lining inside the traditional cylinder body, the effect of reducing the weight of the cylinder body is achieved. One method is to coat the surface of a substrate on the inner wall of the cylinder body with a coating, such as chromium metal, to improve the wear resistance, but the coating and the substrate have different coefficients of thermal expansion to cause shedding, and the service life of the cylinder body depends on the thickness of the coating, which is in the micron scale (CN 105603266A); another approach is to use high silicon aluminum to make engine blocks (ref: Arsha, A.G., et al, Materials & Design,2015[88]: P.1201-1209). The bare primary Si on the surface of the engine cylinder body can provide good wear resistance through grinding and honing by proper processes. Thus, the cast iron bush is omitted, and the contact heat transfer between the piston and the cylinder body is facilitated, so that the recovery of materials is facilitated. However, it was found that brittle Si particles easily fall off from the matrix and are easily broken. Meanwhile, the Al alloy is added with a large amount of Si, which is not beneficial to the forming of the cylinder block (refer to Yu, W., et Al., Journal of Alloys and Compounds,2018[731]: P.444-451). Therefore, the current research direction is to achieve wear-resistant self-lubricating properties of the cylinder wall by surface treatment or to seek a liner instead of a cast iron liner.
In recent years, Mg has attracted considerable attention as the lightest structural material. Meanwhile, SiC, TiC and Al2O3Granules, B4C and C nanotube whiskers and fibers, etc. are widely used as Mg-based composite reinforcements (ref: Oakley, R., R.Cochrane, and R.Stevens Key Engineering materials.1995.Trans Tech Publ.). Among them, the most studied SiC-Mg based composite materials have been applied to propellers, missile empennages and internally reinforced cylinders by Textron, USA. Tensile experiments show that the failure mechanism of the composite material is caused by the separation of the SiC and Mg matrix interface to form cracks and further propagation. In addition, it has been found that high hot extrusion ratios are prone to cracking of the hard and brittle SiC. For the conventional SiC Mg-based composite material, Saravanan (reference: Saravanan, R.and M.Surappa, materials science and Engineering: A,2000.276[ 1]]P.108-116) found 30% vol SiC-Mg in the composite to be resistant to wearCompared with pure magnesium, the performance is improved by two orders of magnitude, but the hard and brittle SiC ceramic particles are easy to fall off from the Mg matrix to cause serious 'furrow' scratches on the surface of the matrix. Meanwhile, the hard and brittle SiC reinforcement body which does not have damping capacity is not beneficial to damping shock absorption of the whole composite material. In view of this, Das et al (reference: Das, A.and S.P.Harimkar, Journal of materials science&Technology,2014.30[11]P.1059-1070.) A SiC-Graphene reinforced Mg composite material is prepared by introducing a carbon material with high damping capacity and self-lubricating property, however, graphite which plays the roles of self-lubricating and improving damping capacity is easy to oxidize and fail under the oxidation environment higher than 350 ℃, therefore, the traditional Mg-based composite material reinforcement has the defects that ① has low plastic toughness and damage tolerance, ② has weak bonding force with an interface formed by a Mg matrix, hard and brittle particles are easy to fall off to cause Mg matrix scratching, the carbon material introduced to overcome the phenomenon is easy to oxidize and fail at high temperature, and ③ later processing is easy to induce the breakage of the hard and brittle particles, such as hot extrusion.
Ti3SiC2The novel ternary layered cermet MAX material capable of being machined has a layered structure similar to graphite in a hexagonal system in the same genus as Mg (reference documents: N.V.Tzenov and M.W.Barsum, J.Am.Ceram.Soc.,2000,83[4 ]]:825)Ti3SiC2The friction coefficient and the friction rate of the alloy are only 0.27 and 1.37 × 10 when the alloy is rubbed with low-carbon steel under the dry friction conditions of 20m/s and 0.8MPa-6mm3V (N.m) (reference: H-X ZHai, et al, mater. Sci. Forum,2005[475-]1251) structure-determining properties, layers to layers of the ⊥ c axis tend to slip under shear forces and to plastically deform metal-like bending straps, for which the barsum group (ref: barsum, m., et., Nature Materials,2003, [2 ]]P.107-111) proposes a kink non-linear elastic deformation mechanism of the MAX material, which is similar to the micro plastic deformation mechanism (incorporated Kik bands) of metals with a close-packed hexagonal structure such as Mg, Ti, etc., so that MAX has excellent damping performance. Thereby, the MAX has excellent damping performance. Therefore, the MAX material can become an ideal reinforcement for preparing magnesium metal structural material with high damping, shock absorption, wear resistance and self-lubricating characteristics, and can be prepared into ceramic particlesAn automobile cylinder sleeve made of particle reinforced Mg-based composite material. Therefore, the present invention employs Ti3SiC2And preparing the automobile cylinder sleeve made of the Mg-based composite material by using the MAX phase material.
Disclosure of Invention
The invention aims to provide oriented Ti3SiC2The ceramic reinforced magnesium-based composite material cylinder body and the preparation method thereof comprise the following components:
ti in cylinder liner3SiC2The volume content of the ceramic phase is 5-35 vol%, the balance is AE44 magnesium alloy, and the balance of the cylinder body is AE44 magnesium alloy.
The microstructure is as follows:
ti in cylinder liners3SiC2The ceramic phase is directionally distributed in the AE44 magnesium alloy, wherein the ceramic phase particles are distributed at the magnesium matrix grain boundary, and the two interfaces are firmly combined. Moreover, the cylinder liner can be machined in a later period.
Oriented Ti of the invention3SiC2The preparation method of the ceramic reinforced magnesium-based composite material cylinder block comprises the following steps:
step 1, melting Mg alloy, cooling to semi-solid state, and preheating Ti at 60 DEG C3SiC2The ceramic powder is added into a high-speed stirred semi-solid AE44 magnesium alloy melt. Heating the melt to 700 ℃, preserving heat for 10mins, and cooling to 500 ℃ again to obtain a semi-solid blank.
And 2, putting the blank at the temperature of 500 ℃ into a press, pushing the blank into a grinding tool at the speed of 0.05-0.5mm/s by using a hot backward extrusion die, and obtaining a tubular cylinder sleeve blank.
And 3, performing rough turning, rough boring, turning of an outer circle, fine boring and fine turning of the outer circle, rough honing, fine honing and platform honing on the obtained Mg-based composite material cylinder sleeve blank in sequence to obtain a magnesium-based cylinder sleeve finished product.
And 4, placing the obtained cylinder sleeve in an improved die-casting die, and pressing the molten AE44 magnesium alloy into the die to obtain the cylinder body.
The invention has the following effects: oriented Ti of the invention3SiC2Ceramic gainThe strong magnesium-based composite material cylinder block has the characteristics of low density and wear resistance and self-lubrication, wherein the wear resistance and self-lubrication are caused by strong toughness Ti3SiC2The orientation of the ceramic particles can improve the service life of the engine cylinder body, reduce the energy consumption of the engine, reduce the emission pollution,
drawings
FIG. 1 is Ti3SiC2And (3) a microstructure light mirror image of the reinforced magnesium-based composite material cylinder sleeve.
FIG. 2 is 15 vol% Ti3SiC2An electron microscope image of the friction surface of the reinforced magnesium-based composite material and an aluminum alloy friction pair under the pressure of 0.5m/s and 2 MPa.
Detailed Description
The invention provides orientable Ti3SiC2The present invention will be described in detail below with reference to the accompanying drawings and examples, but the present invention is not limited thereto.
Example 1
In CO2Under the protective atmosphere, AE44 magnesium alloy is melted and then cooled to be semi-solid, and 15% vol Ti is added3SiC2MAX ceramic powder (the particle size is 1-20 μm) is added into semisolid AE44 magnesium alloy melt which is stirred at high speed. Casting the mixture into a developed lining stainless steel grinding tool, maintaining the pressure at 50-100MPa, cooling to room temperature, heating the melt to 700 ℃, preserving the heat for 10mins, and cooling to 500 ℃ again to obtain a semi-solid blank. Placing the blank at 500 deg.C into a press, hot back-extruding to prepare cylinder jacket, pushing the blank into a grinding tool at a speed of 1mm/s to obtain tubular Ti3SiC2Ceramic matrix enhanced AE44 magnesium based cylinder liner blank. As shown in FIG. 1, the microstructure indicates a ceramic phase Ti3SiC2Respectively in three-dimensional continuous distribution with metal phase Mg-based alloy, wherein the ceramic phase Ti3SiC2The particles are distributed at the grain boundary of the Mg matrix, and the interface of the particles and the Mg matrix is firmly combined. The obtained cylinder liner was placed in a modified die casting mold, and a molten AE44 magnesium alloy was pressed into the mold to obtain a cylinder body.

Claims (3)

1. Directional Ti3SiC2The ceramic reinforced Mg-base composite material cylinder features that it is made of directionally textured Ti3SiC2The cylinder sleeve of the reinforced AE44 magnesium alloy composite material and the AE44 magnesium alloy wrapped around the cylinder sleeve.
2. The Ti of claim 13SiC2Ceramic base reinforcing AE44 magnesium alloy cylinder jacket, its characterized in that: the microstructure is ceramic phase Ti3SiC2Parallel to the cylinder wall, Ti3SiC2And no nano-phase is generated between the two phases of the magnesium alloy, and the cylinder sleeve has excellent wear-resisting and self-lubricating properties.
3. A Ti according to claim 13SiC2The forming characteristic of the reinforced AE44 magnesium alloy composite material cylinder block is that the Ti is directly hot-extruded3SiC2The cylinder sleeve is obtained by ceramic phase reinforced AE44 magnesium alloy composite material, and the cylinder sleeve is placed in an improved die-casting die to be die-cast and formed to obtain the cylinder body.
CN202010581550.2A 2020-06-23 2020-06-23 Directional Ti3SiC2Reinforced magnesium-based composite material cylinder block and preparation method thereof Pending CN111545726A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113149653A (en) * 2021-04-08 2021-07-23 中国科学院金属研究所 MAX-phase ceramic-magnesium or magnesium alloy composite material and preparation method thereof
CN113231791A (en) * 2021-03-23 2021-08-10 北京交通大学 Magnesium-based composite material cylinder sleeve for motorcycle engine and preparation method thereof

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101934365A (en) * 2010-09-27 2011-01-05 上海交通大学 Manufacture method of motorcycle engine cylinder liner based on magnesium-base alloy
TW201200267A (en) * 2010-06-24 2012-01-01 Boamax Ind Co Ltd Structure and manufacturing method of cylinder having high silicon aluminum alloy contained sleeve
CN102358928A (en) * 2011-09-28 2012-02-22 重庆大学 Self-generated mixed particle-reinforced aluminum alloy cylinder sleeve and preparation method thereof
EP2873390A1 (en) * 2013-11-18 2015-05-20 Biotronik AG Semifinished product and high-strength degradable implant formed therefrom
CN107043903A (en) * 2017-04-11 2017-08-15 北京交通大学 Orientation texture Ti2AlC Mg based composites and its hot extrusion preparation method
JP2018001182A (en) * 2016-06-28 2018-01-11 いすゞ自動車株式会社 Reinforced aluminum composite member, manufacturing method thereof, and piston
CN109750197A (en) * 2019-03-26 2019-05-14 北京交通大学 A kind of ternary ceramics enhancing magnesium-based composite material cylinder jacket and preparation method thereof

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW201200267A (en) * 2010-06-24 2012-01-01 Boamax Ind Co Ltd Structure and manufacturing method of cylinder having high silicon aluminum alloy contained sleeve
CN101934365A (en) * 2010-09-27 2011-01-05 上海交通大学 Manufacture method of motorcycle engine cylinder liner based on magnesium-base alloy
CN102358928A (en) * 2011-09-28 2012-02-22 重庆大学 Self-generated mixed particle-reinforced aluminum alloy cylinder sleeve and preparation method thereof
EP2873390A1 (en) * 2013-11-18 2015-05-20 Biotronik AG Semifinished product and high-strength degradable implant formed therefrom
JP2018001182A (en) * 2016-06-28 2018-01-11 いすゞ自動車株式会社 Reinforced aluminum composite member, manufacturing method thereof, and piston
CN107043903A (en) * 2017-04-11 2017-08-15 北京交通大学 Orientation texture Ti2AlC Mg based composites and its hot extrusion preparation method
CN109750197A (en) * 2019-03-26 2019-05-14 北京交通大学 A kind of ternary ceramics enhancing magnesium-based composite material cylinder jacket and preparation method thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113231791A (en) * 2021-03-23 2021-08-10 北京交通大学 Magnesium-based composite material cylinder sleeve for motorcycle engine and preparation method thereof
CN113149653A (en) * 2021-04-08 2021-07-23 中国科学院金属研究所 MAX-phase ceramic-magnesium or magnesium alloy composite material and preparation method thereof

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Application publication date: 20200818