CN102225461A - Method for preparing selectively enhanced aluminum-based composite from ceramic particles - Google Patents
Method for preparing selectively enhanced aluminum-based composite from ceramic particles Download PDFInfo
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Abstract
The invention relates to a method for preparing selectively enhanced aluminum-based composite from ceramic particles and belongs to the field of metal matrix composites (MMCs). The preparation method comprises the following steps: firstly, preparing porous ceramic blanks; and secondly, putting the porous ceramic blanks at a part needing to be enhanced, injecting molten alloy into a mould at 750-1,100 DEG C, applying pressure of 20-50MPa to forcibly fill the molten alloy into the porous ceramic blanks and a mold cavity, and solidifying, thus obtaining the selectively enhanced aluminum-based composite. The method has the advantages that a foaming technology, an injection molding and a gel casting process are combined, thus leading the porous ceramic blank to have designability; the MMC reinforcement and an aluminum matrix are integrally formed by adopting extrusion casting process, thus fully playing the advantages of high strength and high toughness of the aluminum matrix and wear resistance of the MMC reinforcement. The composite has the advantages of high thermal conductivity, good radiation capability, excellent wear resistance and light weight.
Description
Technical field
The invention belongs to field of research of metal, a kind of method for preparing ceramic particle selectivity reinforced aluminum matrix composites is provided especially.
Background technology
Aluminum matrix composite all is widely used at Aeronautics and Astronautics and automotive field.In some structural members, require composite that enough strength and stiffness should be arranged, possess good heat-conducting and anti-wear performance again, the brake drum that uses on the wheel for example, it must possess good comprehensive mechanical properties (high strength and high tenacity) to bear very high torque load, excellent friction and wear behavior is arranged again to realize braking function, also require it to have high thermal conductivity simultaneously to discharge fricative a large amount of heat.Ke Ke requirement is that single aluminium alloy or single aluminum matrix composite are all implacable like this.Single aluminium alloy (as reflectal and extra super duralumin alloy) can not satisfy local anti-wear performance requirement though can guarantee the structural member excellent comprehensive mechanical properties.(though MMC) can satisfy the requirement of anti-wear performance and thermophysical property excellence, there is the low problem of material ductility in Metal matrix composites to single aluminum matrix composite, makes composite lack enough toughness, has reduced fatigue strength.In addition, single aluminum matrix composite is difficult to hole and other mechanical process.If high strength alumin ium alloy and wear-resisting aluminum matrix composite are combined, just can give full play to the thermophysical property of two constituent elements and the characteristic of friction and wear behavior excellence, kept the light-weighted huge advantage of aluminum matrix composite simultaneously.
It is that molten aluminium alloy is infiltrated the porous ceramics base substrate by the method for pressure impregnation or pressure-free impregnation that present liquid phase method prepares aluminum matrix composite, and the single aluminum matrix composite that obtains can not satisfy the requirement to mechanical property, thermophysical property and anti-wear performance simultaneously.Therefore, need to adopt hard ceramic particles or fiber to strengthen.Ceramic phase is introduced with the form of porous ceramics base substrate, in casting process, place the privileged sites that need to strengthen to carry out the selectivity enhancing porous ceramics base substrate, and make molten aluminium alloy infiltrate porous ceramics base substrate and loading mould cavity under pressure, be equivalent in foundry goods, embed metal-base composites behind the alloy graining and strengthen body, and all the other positions still are Birmasil low-cost, that easily process.This part is that the aluminum matrix composite of metal-base composites enhancing body is called novel MMC/Al composite, and it not only has high strength and stiffness, also has excellent thermophysical property (high heat conductance and low thermal coefficient of expansion) and friction and wear behavior.This method is that a new road has been opened up in the research and development of aluminum matrix composite.
Novel MMC/Al composite all has broad application prospects in military project and civil area, is suitable for preparing some brake assemblies and engine pack.In brake assemblies, can use this technology and prepare brake drum, clutch disc, brake disc and caliper.In engine pack, this novel MMC/Al composite can be used as parts such as all-aluminium piston, cylinder jacket or connecting rod.This novel MMC/Al composite is substituted structural members such as cast iron brake drum in the military vehicle and creeper tread and will play significant weight loss effect, to the lightweight of weaponry, and mobility and design freedom have very important significance.
Summary of the invention
The objective of the invention is to disclose a kind of preparation technology of ceramic body selectivity reinforced aluminum matrix composites.By extrusion casint high strength alumin ium alloy matrix and local MMC are strengthened body in conjunction with as a whole, can be fully the characteristic wear-resistant, that thermophysical property is excellent of high strength, high tenacity and the MMC enhancing body of aluminum substrate be brought into play.
The technology that the present invention prepares the selectivity reinforced aluminum matrix composites mainly is divided into two steps: the firstth, and the preparation of porous ceramics base substrate; The secondth, extrusion casint, integral forming.
1. the preparation of porous ceramics base substrate
The porous ceramics base substrate adopts " adding pore creating material+injection molding method " and " adding pore creating material+gel injection-moulding method " two kinds of technologies to prepare:
1.1 add pore creating material+injection molding method
The primary raw material of porous ceramics base substrate is that particle diameter is the SiC powder of 10 ~ 106 μ m.Purity is greater than 98% Al
2O
3, Y
2O
3And SiO
2Powder is as sintering aid.Particle diameter is that the polymethyl methacrylate (PMMA) of 100 ~ 600 μ m serves as pore creating material, PMMA is suitable as the pore creating material of injection molding process, this is because its initial decomposition temperature is 340 ℃, removing temperature fully is 425 ℃, therefore under melting temperature (145-175 ℃), can not decompose, can occupy space certain in the base substrate.In addition, also added a kind of inorganic binder.
At first with Al
2O
3, Y
2O
3And SiO
2Powder makes Al after mixing by the weight ratio of 6:3:1
2O
3-Y
2O
3-SiO
2Sintering aid.In the SiC powder, add the Al of 5 ~ 30wt.% then
2O
3-Y
2O
3-SiO
2The inorganic binder of sintering aid and 1 ~ 5wt.% (as sodium silicate etc.), thus mixed-powder A obtained.The pore creating material PMMA that then adds 10 ~ 40 volume % in mixed-powder A obtains mixed powder B.Mixed powder B speed with 150 ~ 250 rev/mins on ball mill is mixed 8 ~ 24h.Powder B after mixing and polymer constituent element paraffinic base binding agent (45 ~ 70wt.% paraffin, 10 ~ 25wt.% high density polyethylene (HDPE), 15 ~ 20wt.% polypropylene and 5 ~ 10 weight stearic acid) carry out mixing on two roll press and obtain even feeding, and powder B accounts for 50 ~ 68 volume % of feeding.Subsequently with this feeding on the powder injection forming machine with 145 ~ 175 ℃ injection temperature and the injection pressure forming of 75 ~ 125MPa, obtain the preform of required form.Preform carries out solvent degreasing with after removing the part binding agent earlier in trichloro-ethylene solution, be warmed up to 400 ~ 800 ℃ to remove most of binding agent and pore creating material with 30 ℃/hour speed then, at last in vacuum atmosphere or air atmosphere, carrying out sintering under 1200 ~ 1700 ℃ the temperature, thereby obtain the porous ceramics base substrate.
1.2 add pore creating material+gel injection-moulding method
Injection molding technology is relatively more difficult when preparation large-size ceramic base substrate, adopts the gel injection-moulding method can overcome this shortcoming, and it can realize the near-net forming of large scale, complicated shape porous ceramics base substrate.Adopt water base acrylamide gel system that ceramic powders is carried out gel casting, control porosity by the addition of regulating pore creating material.At first with monomer (acrylamide) and crosslinking agent (N, N '-methylene-bisacrylamide) be that 10:1 ~ 40:1 carries out proportioning by mass ratio, and be 10% ~ 30% to be dissolved in the premixed liquid of making transparent and homogeneous in the deionized water by total mass concentration, mix after in premixed liquid, adding the dispersant (ammoniacal liquor) of the mixed powder B that obtains in 1.1 joints and mixed powder B volume 0.1% ~ 5% and 0.05% ~ 3% defoamer (isooctanol) then, at N
2Ball milling 8 ~ 24h obtains suspended nitride under the protective atmosphere.Through after the froth in vacuum, slurry is injected mould and in 40 ℃ ~ 80 ℃ insulations gel reaction fully carried out, slurry curing becomes the base substrate of required form and size, and this base substrate just obtains preform through the vacuum constant temperature drying again.Preform is warmed up to 400 ~ 800 ℃ to remove binding agent and pore creating material with 30 ℃/hour speed, then in carrying out sintering under 1200 ~ 1700 ℃ the temperature in vacuum or air atmosphere, thereby obtains the porous ceramics base substrate.
2. extrusion casint integral forming
Adopt extrusion molding-extrusion casint integral forming technology to prepare novel MMC/Al composite.Figure 2 shows that Extrution casting technique prepares the schematic diagram of ceramic body selectivity reinforced aluminum matrix composites.Selected the high strength alumin ium alloy of two kinds of compositions for use: a kind of composition of aluminium alloy is 6.5 ~ 8wt.%Si, 3.5 ~ 4.5wt.%Cu and surplus Al.The composition of another kind of aluminium alloy is 6 ~ 9wt.%Zn, 1 ~ 3wt.%Mg, 1 ~ 3wt.%Cu and surplus Al.At first the porous ceramics base substrate is placed on the position that needs enhancing, in 750 ~ 1100 ℃ temperature range, molten aluminium alloy is slowly injected mould to avoid the base substrate displacement, crackle occurs and turbulent flow takes place subsequently, then pressure filling porous ceramic body of molten aluminium alloy and die cavity under the pressure of 20 ~ 50MPa, ceramic body after the infiltration and aluminium alloy under the effect of pressure in conjunction with as a whole.High pressure helps the porous ceramics base substrate by complete filling, and has effectively reduced casting flaw.Figure 3 shows that a kind of microscopic structure of novel MMC/Al composite, visible porous ceramics base substrate is by the aluminium alloy complete filling, ceramic particle being evenly distributed in matrix, and aluminium alloy and MMC strengthen metallurgical interface between the body in conjunction with good.
Advantage of the present invention is mainly reflected in the following aspects:
(1) the porous ceramics base substrate has designability.Can according to concrete instructions for use to the geometry of porous ceramics base substrate, size, composition (content of friction constituent element and lubricant component), porosity designs and select appropriate preparation method.
(2) extrusion casint realizes integral forming.It not merely is a simple substrate in composite that metal-base composites strengthens body (MMC).MMC strengthens body and form an organic whole with alloy matrix aluminum in extrusion casint integral forming process, has avoided because coming off of causing of the MMC enhancing body and the difference of aluminum substrate thermal coefficient of expansion or separate.The high strength alumin ium alloy matrix has given composite enough strength and stiffness, and MMC strengthens the wear-resisting effect of body performance, has therefore realized the unification of 26S Proteasome Structure and Function.
(3) excellent in abrasion resistance.The hard phase (ceramic particle or ceramic fibre) that MMC strengthens in the body has been given the friction and wear behavior of composite excellence.By the porosity of control porous ceramics base substrate, the type of ceramic phase, content, particle diameter, particle diameter distribute and add other friction constituent element and lubricant component just can effectively be controlled friction and wear behavior.
(4) thermal conductivity height, heat-sinking capability is good.MMC strengthens body and the Al alloy substrate all has high thermal, fricative a large amount of heats can be distributed timely, thereby keep stationary temperature.This helps keeping the stability of frictional behaviour and increasing the service life.
(5) lightweight.MMC/Al composite in light weight, if being replaced traditional cast iron product, this novel composite material is used for military vehicle or other weaponrys such as panzer, to play significant weight loss effect, this all has very important significance to the lightweight of weaponry and fuel savings, minimizing discharging.
Description of drawings
Fig. 1 is a process chart of the present invention.
Fig. 2 is shown the schematic diagram that Extrution casting technique prepares the selectivity reinforced aluminum matrix composites.
Fig. 3 is a kind of microscopic structure of ceramic body selectivity reinforced aluminum matrix composites.
The specific embodiment
Embodiment 1: the ceramic phase volume mark is 35% aluminum matrix composite in the preparation MMC enhancing body
Powder stock is the SiC particle of 24 μ m, polymethyl methacrylate (PMMA), a kind of inorganic binder and purity that particle diameter is 100 μ m greater than 98% Al
2O
3, Y
2O
3And SiO
2Powder.
The preparation of porous ceramics base substrate: at first with Al
2O
3, Y
2O
3And SiO
2Powder makes Al after mixing by the weight ratio of 6:3:1
2O
3-Y
2O
3-SiO
2Sintering aid.In the SiC powder, add the Al of 10wt.% then
2O
3-Y
2O
3-SiO
2The inorganic binder of sintering aid and 3wt.% (sodium metasilicate), thus mixed-powder A obtained.The pore creating material PMMA that then adds 20 volume % in mixed-powder A obtains mixed powder B.Mixed powder B speed with 200 rev/mins on ball mill is mixed 8h.Powder B after mixing and polymer constituent element paraffinic base binding agent (65wt.% paraffin, 15wt.% high density polyethylene (HDPE), 15wt.% polypropylene and 5 weight stearic acid) carry out mixing on two roll press and obtain uniform feeding, and powder B accounts for 50 volume % of feeding.Subsequently, this feeding being shaped on the powder injection forming machine, is obtained the preform of required form under the injection pressure of 150 ℃ injection temperature, 75MPa.Preform carries out solvent degreasing with after removing the part binding agent earlier in trichloro-ethylene solution, be warmed up to 750 ℃ to remove most of binding agent and pore creating material with 30 ℃/hour speed then, at last under 1550 ℃ temperature, in vacuum atmosphere, carry out sintering, thereby obtain the porous ceramics base substrate.
Extrusion casint: extrusion casint is 7.5wt.%Si, 3.5wt.%Cu and surplus Al with the composition of aluminium alloy.The porous ceramics base substrate is placed on the position that needs enhancing, in 1000 ℃ temperature range, molten aluminium alloy is slowly injected graphite jig subsequently, then under the pressure of 20MPa, force filling porous ceramic body of molten aluminium alloy and die cavity, in conjunction with as a whole, wherein the ceramic phase volume mark is 35% in the MMC enhancing body under the effect of pressure for ceramic body after the infiltration and aluminium alloy
Embodiment 2: the ceramic phase volume mark is 45% aluminum matrix composite in the preparation MMC enhancing body
Powder stock is the SiC particle of 40 μ m, polymethyl methacrylate (PMMA), a kind of inorganic binder and purity that particle diameter is 300 μ m greater than 98% Al
2O
3, Y
2O
3And SiO
2Powder.
The preparation of porous ceramics base substrate: at first with Al
2O
3, Y
2O
3And SiO
2Powder makes Al after mixing by the weight ratio of 6:3:1
2O
3-Y
2O
3-SiO
2Sintering aid.In the SiC powder, add the Al of 20wt.% then
2O
3-Y
2O
3-SiO
2The inorganic binder of sintering aid and 2wt.% (sodium metasilicate), thus mixed-powder A obtained.The pore creating material PMMA that then adds 10 volume % in mixed-powder A obtains mixed powder B.Mixed powder B speed with 250 rev/mins on ball mill is mixed 12h.Powder B after mixing and polymer constituent element paraffinic base binding agent (60wt.% paraffin, 20wt.% high density polyethylene (HDPE), 15wt.% polypropylene and 5 weight stearic acid) carry out mixing on two roll press and obtain even feeding, and powder B accounts for 60 volume % of feeding.Subsequently, this feeding being shaped on the powder injection forming machine, is obtained the preform of required form under the injection pressure of 160 ℃ injection temperature, 80MPa.Preform carries out solvent degreasing with after removing the part binding agent earlier in trichloro-ethylene solution, be warmed up to 700 ℃ to remove most of binding agent and pore creating material with 30 ℃/hour speed then, at last under 1450 ℃ temperature, in air atmosphere, carry out sintering, thereby obtain the porous ceramics base substrate.
Extrusion casint: extrusion casint is 7wt.%Zn with the composition of aluminium alloy, 2.2wt.%Mg, 2.5wt.%Cu and surplus Al.The porous ceramics base substrate is placed on the position that needs enhancing, in 900 ℃ temperature range, molten aluminium alloy is slowly injected graphite jig subsequently, then under the pressure of 30MPa, force filling porous ceramic body of molten aluminium alloy and die cavity, in conjunction with as a whole, wherein the ceramic phase volume mark is 45%. in the MMC enhancing body under the effect of pressure for ceramic body after the infiltration and aluminium alloy
Embodiment 3: the ceramic phase volume mark is 45% large scale aluminum matrix composite in the preparation MMC enhancing body
Powder stock is the SiC particle of 40 μ m, polymethyl methacrylate (PMMA), a kind of inorganic binder and purity that particle diameter is 300 μ m greater than 98% Al
2O
3, Y
2O
3And SiO
2Powder.
The preparation of porous ceramics base substrate: at first with Al
2O
3, Y
2O
3And SiO
2Powder makes Al after mixing by the weight ratio of 6:3:1
2O
3-Y
2O
3-SiO
2Sintering aid.In the SiC powder, add the Al of 10wt.% then
2O
3-Y
2O
3-SiO
2The inorganic binder of sintering aid and 3wt.%, thus mixed-powder A obtained.The pore creating material PMMA that then adds 30 volume % in mixed-powder A obtains mixed powder B.Mixed powder B speed with 250 rev/mins on ball mill is mixed 24h.With acrylamide, N, N '-methylene-bisacrylamide is that 24:1 carries out proportioning by mass ratio, and be 20% to be dissolved in the premixed liquid of making transparent and homogeneous in the deionized water by total mass concentration, in premixed liquid, add then behind the ammoniacal liquor dispersant of mixed powder B and mixed powder B volume 1% and 0.3% the isooctanol defoamer and mix stirring, at N
2Ball milling 24h obtains suspended nitride under the protective atmosphere.After froth in vacuum, slurry is injected mould and in 60 ℃ of insulations gel reaction fully carried out, slurry curing becomes the base substrate of required form and size.Base substrate is through the dry dry body that obtains of vacuum constant temperature.Be warmed up to 650 ℃ to remove binding agent and pore creating material with 30 ℃/hour speed then, under 1550 ℃ temperature, in vacuum atmosphere, carry out sintering then, thereby obtain the porous ceramics base substrate.
Extrusion casint: extrusion casint is 6.5wt.%Si, 4.5wt.%Cu and surplus Al with the composition of aluminium alloy.The porous ceramics base substrate is placed on the position that needs enhancing, in 1100 ℃ temperature range, molten aluminium alloy is slowly injected graphite jig subsequently, then under the pressure of 30MPa, force filling porous ceramic body of molten aluminium alloy and die cavity, ceramic body after the infiltration and aluminium alloy under the effect of pressure in conjunction with as a whole.Wherein the ceramic phase volume mark is 45% in the MMC enhancing body.
Embodiment 4: the ceramic phase volume mark is 65% aluminum matrix composite in the preparation MMC enhancing body
Powder stock is the SiC particle of 24 μ m, polymethyl methacrylate (PMMA), a kind of inorganic binder and purity that particle diameter is 100 μ m greater than 98% Al
2O
3, Y
2O
3And SiO
2Powder.
The preparation of porous ceramics base substrate: at first with Al
2O
3, Y
2O
3And SiO
2Powder makes Al after mixing by the weight ratio of 6:3:1
2O
3-Y
2O
3-SiO
2Sintering aid.In the SiC powder, add the Al of 15wt.% then
2O
3-Y
2O
3-SiO
2The inorganic binder of sintering aid and 5wt.%, thus mixed-powder A obtained.The pore creating material PMMA that then adds 20 volume % in mixed-powder A obtains mixed powder B.Mixed powder B speed with 200 rev/mins on ball mill is mixed 16h.With acrylamide, N, N '-methylene-bisacrylamide is that 30:1 carries out proportioning by mass ratio, and be 18% to be dissolved in the premixed liquid of making transparent and homogeneous in the deionized water by total mass concentration, mix stirring after in premixed liquid, adding the ammoniacal liquor dispersant of mixed powder B and mixed powder B volume 0.5% and 0.1% isooctanol defoamer then, at N
2Ball milling 24h obtains suspended nitride under the protective atmosphere.After froth in vacuum, slurry is injected mould and in 65 ℃ of insulations gel reaction fully carried out, slurry curing becomes the base substrate of required form and size.Base substrate is through the dry dry body that obtains of vacuum constant temperature.Be warmed up to 650 ℃ to remove binding agent and pore creating material with 30 ℃/hour speed then, under 1500 ℃ temperature, in vacuum atmosphere, carry out sintering then, thereby obtain the porous ceramics base substrate.
Extrusion casint: extrusion casint is 7wt.%Zn with the composition of aluminium alloy, 2wt.%Mg, 2.5wt.%Cu and surplus Al.The porous ceramics base substrate is placed on the position that needs enhancing, in 1100 ℃ temperature range, molten aluminium alloy is slowly injected graphite jig subsequently, then under the pressure of 20MPa, force filling porous ceramic body of molten aluminium alloy and die cavity, in conjunction with as a whole, wherein the ceramic phase volume mark is 65% in the MMC enhancing body under the effect of pressure for ceramic body after the infiltration and aluminium alloy.
Claims (3)
1. the preparation method of a ceramic particle selectivity reinforced aluminum matrix composites, it is characterized in that: the preparation method is divided into two steps: step 1 is the preparation of porous ceramics base substrate; Step 2 is extrusion casint, integral forming;
The preparation of step 1, porous ceramics base substrate
The porous ceramics base substrate adopts " adding pore creating material+injection molding method " or " adding pore creating material+gel injection-moulding method " to prepare:
1) adds pore creating material+injection molding method
The primary raw material of porous ceramics base substrate is that particle diameter is the SiC powder of 10 ~ 106 μ m, adopts purity greater than 98% Al
2O
3, Y
2O
3And SiO
2Powder is as sintering aid, is that the polymethyl methacrylate of 100-600 μ m serves as pore creating material with particle diameter, also adds polymer constituent element paraffinic base binding agent;
At first with Al
2O
3, Y
2O
3And SiO
2Powder makes Al after mixing by the weight ratio of 6:3:1
2O
3-Y
2O
3-SiO
2Sintering aid; In the SiC powder, add 5 ~ 30% Al of SiC powder weight then
2O
3-Y
2O
3-SiO
2Sintering aid and 1 ~ 5% inorganic binder obtain mixed-powder A; 10 ~ 40% of interpolation A volume pore creating material polymethyl methacrylate obtains mixed powder B in mixed-powder A; Mixed powder B speed with 150 ~ 250 rev/mins on ball mill was mixed 8 ~ 24 hours, add in the powder B that mixes and carry out mixing on two roll press behind the polymer constituent element paraffinic base binding agent and obtain even feeding, wherein powder B accounts for 50 ~ 68 % of feeding volume; With this feeding on the powder injection forming machine with 145 ~ 175 ℃ injection temperature and the injection pressure forming of 75 ~ 125MPa, obtain the preform of required form; Preform carries out solvent degreasing with after removing the part binding agent earlier in trichloro-ethylene solution, be warmed up to 400 ~ 800 ℃ to remove most of binding agent and pore creating material with 0.5 ~ 5 ℃/minute speed then, at last in vacuum atmosphere or air atmosphere, carrying out sintering under 1200 ~ 1700 ℃ the temperature, thereby obtain the porous ceramics base substrate;
2) add pore creating material+gel injection-moulding method
Adopt water base acrylamide gel system that ceramic powders is carried out gel casting, control porosity by the addition of regulating pore creating material; At first with acrylamide and N, N '-methylene-bisacrylamide is that 10:1 ~ 40:1 carries out proportioning by mass ratio, and be 10% ~ 30% to be dissolved in the premixed liquid of making transparent and homogeneous in the deionized water by total mass concentration, mix behind 0.05% ~ 3% of 0.1% ~ 5% of the mixed powder B that the adding step 1) obtains in premixed liquid, mixed powder B volume ammoniacal liquor and mixed powder B volume the isooctanol then, at N
2Ball milling 8 ~ 24h obtains suspended nitride under the protective atmosphere; Through after the froth in vacuum, slurry is injected mould and in 40 ℃ ~ 80 ℃ insulations gel reaction fully carried out, slurry curing becomes the base substrate of required form and size, and this base substrate is again through obtaining preform after the vacuum constant temperature drying; Preform is warmed up to 400 ~ 800 ℃ to remove binding agent and pore creating material with 30 ℃/hour speed, then under 1200 ~ 1700 ℃ the temperature in vacuum or air atmosphere sintering, thereby obtain the porous ceramics base substrate;
Step 2, extrusion casint integral forming
Select for use high strength alumin ium alloy to adopt extrusion molding-extrusion casint integral forming technology to prepare novel MMC/Al composite; Selected high strength alumin ium alloy composition weight percentage is: the Al of 6.5 ~ 8% Si, 3.5 ~ 4.5% Cu and surplus; At first the porous ceramics base substrate is placed on the position that needs enhancing, in 750 ~ 1100 ℃ temperature range, the fusion high strength alumin ium alloy is slowly injected mould subsequently; Under the pressure of 20 ~ 50MPa, force filling porous ceramic body of fusion high strength alumin ium alloy and die cavity, ceramic body after the infiltration and aluminium alloy under the effect of pressure in conjunction with as a whole.
2. the preparation method of ceramic particle selectivity reinforced aluminum matrix composites as claimed in claim 1 is characterized in that: described polymer constituent element paraffinic base binding agent composition and weight percentage are: 45 ~ 70% paraffin, 10 ~ 25% high density polyethylene (HDPE), 15 ~ 20% polypropylene and 5 ~ 10% stearic acid.
3. the preparation method of potting porcelain particle selectivity reinforced aluminum matrix composites as claimed in claim 1 is characterized in that: described high strength alumin ium alloy composition weight percentage is: the Mg of the Zn of 6 ~ 9 %, 1 ~ 3 %, the Cu of 1 ~ 3 % and the Al of surplus.
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| CN114349528A (en) * | 2021-12-28 | 2022-04-15 | 中国科学院长春光学精密机械与物理研究所 | Defective silicon carbide biscuit, preparation method thereof and nondestructive testing method |
| CN115056155A (en) * | 2022-07-11 | 2022-09-16 | 河北锟洲科技有限公司 | Method for manufacturing porous metal bond grinding wheel |
| CN117267285A (en) * | 2023-11-21 | 2023-12-22 | 山西汤荣机械制造股份有限公司 | Brake drum convenient to heat dissipation and casting device thereof |
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| CN102808100A (en) * | 2012-08-29 | 2012-12-05 | 哈尔滨工业大学 | Preparation method for directional hole ceramic enhanced metal matrix composite material |
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