CN108547887B - Inorganic salt reinforced aluminum alloy composite material, self-cooling brake disc prepared from inorganic salt reinforced aluminum alloy composite material and preparation method - Google Patents
Inorganic salt reinforced aluminum alloy composite material, self-cooling brake disc prepared from inorganic salt reinforced aluminum alloy composite material and preparation method Download PDFInfo
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- CN108547887B CN108547887B CN201810325508.7A CN201810325508A CN108547887B CN 108547887 B CN108547887 B CN 108547887B CN 201810325508 A CN201810325508 A CN 201810325508A CN 108547887 B CN108547887 B CN 108547887B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D65/00—Parts or details
- F16D65/02—Braking members; Mounting thereof
- F16D65/12—Discs; Drums for disc brakes
- F16D65/125—Discs; Drums for disc brakes characterised by the material used for the disc body
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D65/00—Parts or details
- F16D65/02—Braking members; Mounting thereof
- F16D65/12—Discs; Drums for disc brakes
- F16D65/128—Discs; Drums for disc brakes characterised by means for cooling
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D65/00—Parts or details
- F16D65/78—Features relating to cooling
- F16D65/84—Features relating to cooling for disc brakes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D65/00—Parts or details
- F16D65/78—Features relating to cooling
- F16D65/84—Features relating to cooling for disc brakes
- F16D65/847—Features relating to cooling for disc brakes with open cooling system, e.g. cooled by air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D69/00—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
- F16D69/02—Compositions of linings; Methods of manufacturing
- F16D69/027—Compositions based on metals or inorganic oxides
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D65/00—Parts or details
- F16D65/02—Braking members; Mounting thereof
- F16D2065/13—Parts or details of discs or drums
- F16D2065/1304—Structure
- F16D2065/132—Structure layered
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D65/00—Parts or details
- F16D65/02—Braking members; Mounting thereof
- F16D2065/13—Parts or details of discs or drums
- F16D2065/1304—Structure
- F16D2065/1328—Structure internal cavities, e.g. cooling channels
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2200/00—Materials; Production methods therefor
- F16D2200/0004—Materials; Production methods therefor metallic
- F16D2200/0026—Non-ferro
- F16D2200/003—Light metals, e.g. aluminium
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2200/00—Materials; Production methods therefor
- F16D2200/0082—Production methods therefor
- F16D2200/0086—Moulding materials together by application of heat and pressure
Abstract
The invention discloses an inorganic salt reinforced aluminum alloy composite material, a self-cooling brake disc prepared from the inorganic salt reinforced aluminum alloy composite material and a preparation method of the self-cooling brake disc, and belongs to the field of brake discs. The inorganic salt reinforced aluminum alloy composite material provided by the invention comprises an aluminum alloy and an inorganic salt reinforced material. The inorganic salt reinforced aluminum alloy composite material provided by the invention realizes the adjustment of the melting point of the inorganic salt through the reasonable modulation and collocation of the inorganic salt system, the inorganic salt system can absorb a large amount of heat during phase change, the heat storage capacity of the composite material can be greatly improved by adding the inorganic salt system into the aluminum alloy, and further, the disc temperature is lower and the working state is more stable when a brake disc is in friction and wear.
Description
Technical Field
The invention relates to the field of brake discs, in particular to an inorganic salt reinforced aluminum alloy composite material.
Background
Under the continuously upgraded requirements of energy conservation and emission reduction, the trend of light weight in the braking fields of high-speed rails, automobiles and the like is irreversible. The weight reduction of a brake disc, which is one of the unsprung components, is of extraordinary importance, since the weight reduction of one kilogram of unsprung mass per unit mass corresponds to a weight reduction of 10 kilograms of sprung mass. The brake disc is also called brake disc, and is an important component of brake systems of high-speed rails, automobiles and the like. The brake disc rotates with the wheel when high-speed railway and car motion, and brake caliper cliies the brake disc during the braking, produces the friction with the friction surface of brake disc, and then plays the effect of slowing down. Therefore, the excellent braking performance of the brake disc is directly related to the driving safety. Cast iron brake discs are widely used due to their low cost and wide source of raw materials. However, as the requirements for high-speed rails and automobiles as well as safety performance are continuously increased, the requirements for brake discs are also continuously increased. The iron casting brake disc can not meet the requirements of high-performance high-speed rail and automobiles gradually due to easy hot cracking and poor wear resistance, and meanwhile, the mass of the iron casting brake disc is large, so that the oil consumption of the high-speed rail and the automobiles is increased, and through research, the oil saving effect of people after reducing the weight of the unsprung parts is 8-11 times of the oil saving effect of reducing the weight of the unsprung parts. Therefore, the research on a brake disc with good friction performance, excellent heat resistance, high strength and light weight has great commercial prospect.
At present, the mainstream material of high-speed rails and automobile brake discs is mainly cast steel or cast iron, the market share exceeds 90%, and carbon-ceramic composite material brake discs are high in manufacturing cost at present and are mainly applied to high-end vehicle types and special vehicle types such as racing vehicles. As the brake disc made of the aluminum matrix composite material which is most likely to replace cast steel or cast iron discs, the weight reduction effect is best, the industrial preparation cost is lowest, and the brake disc is not practically applied to the past years of research and development. The stable working temperature of the aluminum alloy is generally less than 350 ℃, the heat fading temperature of the brake disc can reach 500-600 ℃ at most, and the instantaneous friction temperature is even higher when the friction surface of the brake disc is in friction with a dual friction plate, so when the aluminum alloy composite material with the same size is used for preparing the brake disc instead of cast steel or cast iron, the volumetric heat capacity is reduced, when the friction generates the same heat, the disc temperature of the brake disc made of the aluminum alloy composite material is dozens of to hundreds of ℃, and the heat resistance of an aluminum alloy matrix in the aluminum alloy composite material is much lower than that of the cast steel or cast iron. The biggest obstacle of the current aluminum-based composite material applied to a brake disc is that the heat resistance is poor, and the heat resistance cannot meet the severe heat fading requirement of high-speed rails and automobiles during braking, so that the disc temperature is controlled to be lower than the temperature which can be borne by aluminum alloy during braking, and the problem of friction and wear performance deterioration caused by softening and even melting of the aluminum alloy is urgent at present.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the problems that the aluminum alloy brake disc in the prior art has poor heat resistance and cannot meet the requirements of high-speed rail and severe heat fading during automobile braking, so that the inorganic salt reinforced aluminum alloy composite material, the self-cooling brake disc prepared from the inorganic salt reinforced aluminum alloy composite material and the preparation method are provided.
Therefore, the invention provides the following technical scheme:
an inorganic salt reinforced aluminum alloy composite material comprises an aluminum alloy and an inorganic salt reinforced material.
The dosage of the inorganic salt reinforcing material is 5 vol.% to 20 vol.%, and the dosage of the aluminum alloy is 80 vol.% to 95 vol.%.
The inorganic salt reinforcing material is selected from one or more of chloride salt, carbonate, nitrate and fluoride salt to be mixed; the aluminum alloy is cast aluminum alloy, and the main component of the aluminum alloy is Al-Si-Cu-Mg.
The chloride salt is selected from one or more of sodium chloride, magnesium chloride, calcium chloride and barium chloride; the carbonate is selected from one or two of sodium carbonate and barium carbonate; the nitrate is selected from one or more of potassium nitrate, sodium nitrate and sodium nitrite; the fluoride salt is selected from one or more of lithium fluoride, magnesium fluoride, potassium fluoride and calcium fluoride.
The density of the system of the inorganic salt reinforced material is 1.0-2.8 g/cm3。
A preparation process of an inorganic salt reinforced aluminum alloy brake disc comprises the following steps:
(1) weighing an inorganic salt reinforcing material according to a proportion, and calcining to obtain an inorganic salt friction body;
(2) pressing the inorganic salt friction body into a capsule shape, and adopting metal aluminum, copper and/or titanium as a capsule outer skin, wherein the capsule is one or more of a spherical shape, an ellipsoidal shape, a cuboid shape and/or a cube shape;
(3) connecting the inorganic salt friction body capsules by using metal wires, and welding the inorganic salt friction body capsules into a net to form a prefabricated body;
(4) preheating a mould to 230 ℃ of 200-.
In the step (1), the calcining temperature is 100-1100 ℃; in the step (2), the mould pressing pressure is 50MPa-100 MPa; and (3) selecting any one of copper, aluminum, titanium and stainless steel as the material of the connecting metal wire.
In the step (4), the heat treatment is as follows: and (3) casting, molding and cooling the inorganic salt reinforced aluminum alloy composite material to room temperature, taking out a sample piece, heating the sample piece to 480-plus 490 ℃, preserving heat for 5-6h, then cooling to less than 150 ℃, then heating to 165-plus 175 ℃, preserving heat for 10-12h, and cooling to obtain the inorganic salt reinforced aluminum alloy brake disc.
An inorganic salt reinforced aluminum alloy self-cooling brake disc comprises an upper friction layer, a cooling structure and a lower friction layer which are sequentially arranged from top to bottom;
the flange plate is arranged at the center of the self-cooling brake disc and penetrates through the self-cooling brake disc, and the flange plate is fixedly connected with a vehicle body;
the upper friction layer and the lower friction layer are made of the composite material.
The cooling structure comprises two parts, namely a ventilation duct and a reinforcing rib, wherein the ventilation ducts are communicated with each other; the shape of the ventilation duct is selected from any one of square, round, oval, diamond, trapezoid and streamline or the combination thereof.
The reinforcing rib material is an aluminum alloy or an aluminum-based composite material, the reinforcing body material of the aluminum-based composite material is one or more of oxide, nitride and carbide, and the thickness of the reinforcing rib is 1mm-50 mm; the flange plate is made of cast aluminum alloy.
The technical scheme of the invention has the following advantages:
1. the inorganic salt reinforced aluminum alloy composite material provided by the invention realizes the adjustment of the melting point of the inorganic salt through the reasonable modulation and collocation of the inorganic salt system, the inorganic salt system can absorb a large amount of heat during phase change, the heat storage capacity of the composite material can be greatly improved by adding the inorganic salt system into the aluminum alloy, and further, the disc temperature is lower and the working state is more stable when a brake disc is in friction and wear.
2. The density of an inorganic salt system selected in the inorganic salt reinforced aluminum alloy composite material provided by the invention is 1.0-2.8 g/cm3The composite material after being added is lighter in weight, the slow rise of the temperature of the brake disc during working is ensured, the temperature of the brake disc is stabilized below 350 ℃, and the stable and reliable frictional wear performance of the brake disc during working is ensured.
3. The density of the upper and lower friction layers of the inorganic salt reinforced aluminum alloy self-cooling brake disc provided by the invention reaches 98%; the friction coefficient of the material can reach 0.42 from 0.35 to 0.45, and the material has good heat insulation performance and heat conduction performance, and the heat conduction coefficient is up to 120-; and the mechanical strength is good, and the tensile strength reaches 80-150 MPa.
4. According to the inorganic salt reinforced aluminum alloy self-cooling brake disc provided by the invention, the shearing strength of the combination of the aluminum alloy and the inorganic salt reinforced material reaches 20-40MPa or above.
5. According to the inorganic salt reinforced aluminum alloy self-cooling brake disc provided by the invention, the inorganic salt phase-change material is selected to reinforce the cast aluminum alloy, the ventilation pore canal and the reinforcing rib are designed to meet the heat dissipation requirement of the working state of the brake disc, so that the requirements that the working temperature is lower than the temperature rise slowly and the highest temperature is lower than the stable working temperature of the aluminum alloy and is lower than 350 ℃ when the brake disc works are met, and the requirements of the aluminum matrix composite brake disc for high-speed rail and automobile braking can be well met.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic structural view of an inorganic salt reinforced aluminum-based self-cooling brake disc provided by the invention;
reference numerals:
1-upper friction layer, 2-cooling structure, 3-lower friction layer and 4-flange plate.
Detailed Description
The following examples are provided to further understand the present invention, not to limit the scope of the present invention, but to provide the best mode, not to limit the content and the protection scope of the present invention, and any product similar or similar to the present invention, which is obtained by combining the present invention with other prior art features, falls within the protection scope of the present invention.
The examples do not show the specific experimental steps or conditions, and can be performed according to the conventional experimental steps described in the literature in the field. The reagents or instruments used are not indicated by manufacturers, and are all conventional reagent products which can be obtained commercially.
The mold release agent used in examples 1-5 was a forging mold release agent purchased from Shanghai Jinmega energy saving technology Co., Ltd., product type: water-soluble quench liquid KS-QUE 2700;
for comparison, the brake disc molds of examples 1-5 are identical in shape and structure.
Through detection, the density of an inorganic salt system of the inorganic salt reinforced aluminum alloy composite material prepared in the embodiments 1-5 of the invention is 1.0-2.8 g/cm3。
Examples 1 to 5
A preparation process of an inorganic salt reinforced aluminum alloy self-cooling brake disc comprises the following steps:
(1) weighing inorganic salt reinforcing materials according to a proportion, and calcining at the temperature of 100-1100 ℃ to obtain an inorganic salt friction body;
(2) pressing the inorganic salt friction body obtained in the step (1) into a spherical capsule under the mould pressing pressure of 50MPa-100MPa, wherein the inorganic salt friction body is arranged inside the capsule, the outer skin of the capsule is made of metal aluminum, copper, titanium and the like, and the capsule can be an ellipsoid, a cuboid, a cube and the like to achieve the purpose of the invention;
(3) the metal wire made of copper is connected with the inorganic salt friction body capsule and is welded into a net to form a prefabricated body, and the connection metal wire can be made of any one of aluminum, titanium and stainless steel to achieve the purpose of the invention;
(4) preheating a mould to 230 ℃ of 200-.
TABLE 1 compositions and compounding ratios (parts by weight) of the inorganic salt reinforcing materials of examples 1-5
TABLE 2 proportioning tables (parts by weight) of chloride, carbonate, nitrate and fluoride salts in the inorganic salt reinforcement systems of examples 1-5
| Chlorinated salt | Carbonate salt | Nitrate salt | Fluoride salt | |
| Example 1 | 1 | 5 | 7 | 3 |
| Example 2 | 7 | 2 | 4 | 9 |
| Example 3 | 8 | 7 | 3 | 5 |
| Example 4 | 2 | 1 | 4 | 7 |
| Example 5 | 4 | 1 | 3 | 2 |
TABLE 3 proportioning Table (wt.%) of inorganic salt reinforcing materials and aluminum alloys of examples 1-5
| Inorganic salt reinforced material | Aluminium alloy | |
| Example 1 | 5 | 95 |
| Example 2 | 20 | 80 |
| Example 3 | 15 | 85 |
| Example 4 | 10 | 90 |
| Example 5 | 18 | 82 |
Example 6
As shown in fig. 1, the present embodiment provides an inorganic salt reinforced aluminum alloy self-cooling brake disc, which includes an upper friction layer 1, a cooling structure 2, and a lower friction layer 3, which are sequentially arranged from top to bottom;
the flange plate 4 is arranged at the center of the self-cooling brake disc and penetrates through the self-cooling brake disc, and the flange plate 4 is fixedly connected with a vehicle body;
the composite material of any one of claims 1 to 5 is used for the upper friction layer 1 and the lower friction layer 3.
The cooling structure 2 comprises two parts, namely a ventilation duct and a reinforcing rib, wherein the ventilation ducts are communicated with each other; the shape of the ventilation duct is selected from any one of square, round, oval, diamond, trapezoid and streamline or the combination thereof.
The reinforcing rib material is an aluminum alloy or an aluminum-based composite material, the reinforcing body material of the aluminum-based composite material is one or more of oxide, nitride and carbide, and the thickness of the reinforcing rib is 1mm-50 mm; the flange plate 4 is made of cast aluminum alloy.
Validation of the effects of self-Cooling brake disks prepared in examples 1-5
1. The heat conductivity coefficient test is used for detecting the heat conductivity coefficients of the upper friction layer and the lower friction layer of the self-cooling brake disc of each embodiment of the invention at 350 ℃, and the result is shown in table 4;
TABLE 4
| Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | |
| Coefficient of thermal conductivity (W/m. K) | 180 | 166 | 150 | 145 | 120 |
From the table 4, the heat conductivity of the inorganic salt friction material prepared in examples 1-5 is up to 120-.
2. The density of the upper friction layer and the lower friction layer of the self-cooling brake disc is detected by a volume weight method, and the result is shown in table 5.
TABLE 5
| Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | |
| Compactness degree | 98％ | 98％ | 98％ | 98％ | 98％ |
The compactness of the upper friction layer and the lower friction layer of the self-cooling brake disc prepared in the embodiments 1 to 5 reaches 98 percent, and the two friction layers are all compact aluminum matrix composite materials.
3. The friction coefficients of the upper and lower friction layers of the self-cooling brake disc were measured according to international standard "SAE J2522-2003 dynamometer disc brake performance", and the results are shown in table 6.
TABLE 6
| Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | |
| Coefficient of friction | 0.35 | 0.38 | 0.41 | 0.42 | 0.39 |
As can be seen from the data in Table 6, the friction coefficients of the upper and lower friction layers of the self-cooling brake disks prepared in examples 1 to 5 were 0.35 to 0.45, which demonstrates that the friction properties of the upper and lower friction layers of the self-cooling brake disks prepared according to the present invention are good.
4. The tensile strengths of the upper and lower friction layers of the self-cooling brake disc were measured by the three-point bending fatigue pre-cracked Single Edge Notched Beam (SENB) method, and the results are shown in table 7.
TABLE 7
| Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | |
| Tensile strength (MPa) | 120 | 100 | 80 | 120 | 150 |
From Table 7, the tensile strengths of the upper and lower friction layers of the self-cooling brake disks prepared in examples 1 to 5 are 80 to 150MPa, which shows that the upper and lower friction layers of the self-cooling brake disks prepared according to the present invention have high tensile deformation resistance.
5. The shearing strength of the inorganic salt reinforced aluminum alloy brake disc is detected by a shearing machine, and the result is shown in table 8.
TABLE 8
From the data in table 8, it can be seen that the shear strength of the inorganic salt reinforced aluminum alloy brake discs prepared in examples 1 to 5 is 20 to 40MPa, which proves that the inorganic salt reinforced composite material and the aluminum alloy material in the inorganic salt reinforced aluminum alloy brake discs prepared in the invention have strong bonding force.
6. The inorganic salt reinforced aluminum alloy self-cooling brake disc prepared in the embodiments 1 to 5 of the invention is subjected to detection on the disc temperature after working for 4 hours, and the results are shown in table 9.
TABLE 9
| Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | |
| Temperature/. degree.C | 330 | 200 | 250 | 321 | 342 |
The inorganic salt reinforced aluminum alloy self-cooling brake discs prepared in examples 1-5 all stabilized below 350 ℃ after 4 hours of operation.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (7)
1. A preparation process of an inorganic salt reinforced aluminum alloy brake disc comprises the following steps:
(1) weighing an inorganic salt reinforcing material according to a proportion, and calcining to obtain an inorganic salt friction body;
(2) pressing the inorganic salt friction body into a capsule shape, and adopting metal aluminum, copper and/or titanium as capsule skins, wherein the capsule is one or more of a sphere, a cuboid and/or a cube;
(3) connecting the inorganic salt friction body capsules by using metal wires, and welding the inorganic salt friction body capsules into a net to form a prefabricated body;
(4) preheating a mould to 230 ℃ for plus 200 ℃, spraying a release agent into a cavity of the mould, then placing the prefabricated part and the sand core into a preset position, then heating to 650 ℃ for plus 550 ℃, pouring an aluminum alloy molten solution into the cavity of the mould after the aluminum alloy is heated to 850 ℃ for plus 700 ℃ for plus 850 ℃, casting under the pressure of 0.1-10MPa, maintaining the pressure for 30min, cooling to room temperature, namely casting and molding the inorganic salt reinforced aluminum alloy composite material, and then carrying out heat treatment to obtain the inorganic salt reinforced aluminum alloy self-cooling brake disc.
2. The preparation process according to claim 1, wherein the volume ratio of the inorganic salt reinforcing material to the aluminum alloy is 1:19 to 3: 7.
3. The preparation process according to claim 2, wherein the inorganic salt reinforcing material is one or more selected from chloride salt, carbonate salt, nitrate salt and fluoride salt; the aluminum alloy is cast aluminum alloy, and the main component of the aluminum alloy is Al-Si-Cu-Mg.
4. The preparation process according to claim 3, wherein the chloride salt is selected from one or more of sodium chloride, magnesium chloride, calcium chloride and barium chloride; the carbonate is selected from one or two of sodium carbonate and barium carbonate; the nitrate is selected from one or more of potassium nitrate, sodium nitrate and sodium nitrite; the fluoride salt is selected from one or more of lithium fluoride, magnesium fluoride, potassium fluoride and calcium fluoride.
5. The preparation process of claim 4, wherein the density of the inorganic salt reinforcing material system is 1.0-2.8 g/cm3。
6. The preparation process according to claim 1, wherein in the step (1), the calcination temperature is 100-1100 ℃; in the step (2), the mould pressing pressure is 50MPa-100 MPa; in the step (3), the connecting metal wire is made of any one of copper, aluminum, titanium and stainless steel.
7. The production process according to claim 1, wherein in the step (4), the heat treatment is: and (3) casting, molding and cooling the inorganic salt reinforced aluminum alloy composite material to room temperature, taking out a sample piece, heating the sample piece to 480-plus 490 ℃, preserving heat for 5-6h, then cooling to less than 150 ℃, then heating to 165-plus 175 ℃, preserving heat for 10-12h, and cooling to obtain the inorganic salt reinforced aluminum alloy brake disc.
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| CN1492066A (en) * | 2003-09-12 | 2004-04-28 | 吉林大学 | Composite material for automobile brake disc and its preparing method |
| CN1786507A (en) * | 2005-10-24 | 2006-06-14 | 北京交通大学 | Shaft mounted brake disk of SiC granule enhanced aluminium based composite material |
| CN201309475Y (en) * | 2008-12-11 | 2009-09-16 | 龙口海盟机械有限公司 | Automobile brake disk |
| CN104315052A (en) * | 2014-08-29 | 2015-01-28 | 宁国飞鹰汽车零部件股份有限公司 | Microcapsule modified thermoplastic phenolic resin composite material brake pad |
| CN105443618A (en) * | 2015-12-21 | 2016-03-30 | 南京东电检测科技有限公司 | Tilting preventive casting-forging brake disc for rail vehicle |
| CN107489711A (en) * | 2017-09-07 | 2017-12-19 | 克诺尔车辆设备(苏州)有限公司 | A kind of anti-damascene type brake disc |
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