CN112343949B - High-heat-conductivity and low-thermal-expansion brake lining and preparation method thereof - Google Patents
High-heat-conductivity and low-thermal-expansion brake lining and preparation method thereof Download PDFInfo
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- CN112343949B CN112343949B CN202011232338.1A CN202011232338A CN112343949B CN 112343949 B CN112343949 B CN 112343949B CN 202011232338 A CN202011232338 A CN 202011232338A CN 112343949 B CN112343949 B CN 112343949B
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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
- F16D69/023—Composite materials containing carbon and carbon fibres or fibres made of carbonizable material
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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
- F16D69/00—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
- F16D2069/002—Combination of different friction materials
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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
- F16D2200/0034—Materials; Production methods therefor non-metallic
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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
- F16D2200/0034—Materials; Production methods therefor non-metallic
- F16D2200/0052—Carbon
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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
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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
- F16D2250/00—Manufacturing; Assembly
- F16D2250/0023—Shaping by pressure
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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
- F16D2250/00—Manufacturing; Assembly
- F16D2250/0038—Surface treatment
Abstract
The invention belongs to the technical field of friction braking, and particularly relates to a brake lining with high heat conduction and low thermal expansion. High conductivity of the inventionThe brake lining with heat and low thermal expansion is mainly prepared from the following components in parts by weight: 6 to 10 portions of phenolic resin, 6 to 12 portions of synthetic graphite, 3 to 5 portions of high-carbon crystalline flake graphite, 10 to 20 portions of precipitated barium sulfate, 10 to 15 portions of mineral fiber, 10 to 15 portions of calcium silicate whisker, cu-ZrW 2 O 8 10 to 20 portions of calcined petroleum coke, 10 to 20 portions of calcined petroleum coke and 3 to 10 portions of carbon fiber. The brake lining prepared by the invention has the advantages of high thermal conductivity, low thermal expansion, stable friction coefficient, small abrasion, low noise and stable performance.
Description
Technical Field
The invention belongs to the technical field of friction braking, and particularly relates to a brake lining with high heat conductivity and low thermal expansion and a preparation method thereof.
Background
The brake block is a vital part of the motor vehicle, and the quality of the braking performance directly depends on the safety of the vehicle. With the progress of the automobile industry, the demand for brake pads for automobiles has been increasing, and in recent years, there has been a demand for development of friction materials that generate less braking noise, and disc brake linings containing no steel fibers or steel fibers and containing NAO materials have been widely used. In order to ensure the performance required for a friction material of NAO material used for a disc brake lining, a copper component such as copper or copper alloy fibers or particles is added as an essential component. In order to meet the requirement of the friction coefficient, friction-increasing materials such as zirconia, zircon powder and the like are required to be added, the materials used in the formula are various, the ingredients are easy to make mistakes, and the tracing is inconvenient.
Disclosure of Invention
The invention aims to provide a brake lining with high heat conduction and low thermal expansion.
It is a further object of the present invention to provide a disc brake pad including the above brake lining.
It is a further object of the present invention to provide a method for producing the above brake lining.
According to the brake lining with high heat conductivity and low thermal expansion, the brake lining is mainly prepared from the following components in parts by weight: 6 to 10 portions of phenolic resin, 6 to 12 portions of synthetic graphite, 3 to 5 portions of high-carbon crystalline flake graphite, 10 to 20 portions of precipitated barium sulfate, 10 to 15 portions of mineral fiber, 10 to 15 portions of calcium silicate whisker, cu-ZrW 2 O 8 10 to 20 portions of calcined petroleum coke, 10 to 20 portions of calcined petroleum coke and 3 to 10 portions of carbon fiber.
Cu-ZrW in the invention 2 O 8 Is Cu and ZrW 2 O 8 Can comprehensively utilize the high thermal conductivity of Cu and ZrW 2 O 8 Has a coefficient of thermal expansion matched to that of Si. Cu-ZrW 2 O 8 The method is generally applied to electrical devices and is not applied to the field of automobile braking. The invention is prepared by reacting Cu-ZrW 2 O 8 Compounding with carbon fiber and adjusting the mixture ratio to ensure that Cu-ZrW 2 O 8 The brake lining can be applied to the brake lining, and the brake lining which has high heat conduction and low thermal expansion performance, low noise and stable performance is obtained.
According to the brake lining with high heat conductivity and low thermal expansion, the brake lining is mainly prepared from the following components in parts by weight: 6 parts of phenolic resin, 6 parts of synthetic graphite, 3 parts of high-carbon crystalline flake graphite, 10 parts of precipitated barium sulfate, 10 parts of mineral fiber, 10 parts of calcium silicate whisker and Cu-ZrW 2 O 8 10 parts of calcined petroleum coke and 3 parts of carbon fiber.
According to the brake lining with high heat conductivity and low thermal expansion, the brake lining is mainly prepared from the following components in parts by weight: 8 parts of phenolic resin, 8 parts of synthetic graphite, 4 parts of high-carbon flake graphite, 15 parts of precipitated barium sulfate, 12 parts of mineral fiber, 12 parts of calcium silicate whisker and Cu-ZrW 2 O 8 15 parts of calcined petroleum coke and 8 parts of carbon fiber.
According to the brake lining with high heat conductivity and low thermal expansion, the brake lining is mainly prepared from the following components in parts by weight: 10 parts of phenolic resin, 12 parts of synthetic graphite, 5 parts of high-carbon crystalline flake graphite, 20 parts of precipitated barium sulfate, 15 parts of mineral fiber, 15 parts of calcium silicate whisker and Cu-ZrW 2 O 8 20 parts of calcined petroleum coke and 10 parts of carbon fiber.
According to the specific embodiment of the invention, the disc brake pad comprises a steel backing and a high-heat-conductivity and low-thermal-expansion brake lining connected to the steel backing, wherein the brake lining is mainly prepared from the following components in parts by weight: 6 to 10 portions of phenolic resin, 6 to 12 portions of synthetic graphite, 3 to 5 portions of high-carbon crystalline flake graphite, 10 to 20 portions of precipitated barium sulfate, 10 to 15 portions of mineral fiber, 10 to 15 portions of calcium silicate whisker, cu-ZrW 2 O 8 1020 portions of calcined petroleum coke, 10 to 20 portions of calcined petroleum coke and 3 to 10 portions of carbon fiber.
The preparation method of the disc brake pad according to the embodiment of the invention comprises the following steps:
(1) The carbon fiber and Cu-ZrW with the formula amount 2 O 8 Adding 1/4 formula amount of phenolic resin and 1/4 formula amount of precipitated barium sulfate into a roller mixer, stirring for 3-5 min under the condition of 200-300 r/min, and premixing; adding the rest of the formula materials into a roller type mixer, stirring for 5-15 min under the condition of 400-500 r/min, and uniformly mixing the materials;
(2) The hot-pressing die is an ejection die, the lower layer is made of raw materials, and the upper layer is a steel backing; the hot-press molding temperature is 140-160 ℃, and the pressure is 400-500 kg/cm 2 The curing time is 8-10 min;
(3) Carrying out heat treatment on the product subjected to the hot press molding in the step (2);
(4) And (4) grinding the product obtained in the step (3).
According to the preparation method of the disc brake pad, in the step (3), the heat treatment temperature is 160-170 ℃, and the heat treatment time is 3-5 h;
according to the preparation method of the disc brake pad of the embodiment of the invention, in the step (1), materials are stirred for 5min at the condition of 250r/min for premixing.
According to the method for manufacturing the disc brake pad of the embodiment of the invention, in the step (2), the control temperature of the hot press molding is 150 ℃, and the pressure is 450kg/cm 2 The curing time was 8min.
According to the method for manufacturing the disc brake pad of the embodiment of the present invention, in the step (3), the heat treatment temperature is 165 ℃ and the heat treatment time is 4 hours.
The invention has the beneficial effects that:
the brake lining has the advantages of simple formula components, convenient batching operation and strong traceability;
in the invention, cu-ZrW is used 2 O 8 The brake lining is applied by matching carbon fiber and utilizing the carbon fiberForming a firm skeleton to obtain Cu-ZrW 2 O 8 The brake lining prepared by the invention not only has high thermal conductivity, low thermal expansion, stable friction coefficient, small abrasion, low noise and stable performance;
the brake lining of the invention does not need to add friction-increasing materials in the formula.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
Example 1 preparation of a brake lining according to the invention
Table 1 formulation ratio of brake lining of the present invention
The brake lining is processed according to the steps of raw material mixing, pressing, heat treatment and coping, and the preparation method comprises the following steps: .
(1) Mixing raw materials: the carbon fiber and Cu-ZrW with the formula amount 2 O 8 Adding the phenolic resin with the formula amount of 1/4 and the precipitated barium sulfate with the formula amount of 1/4 into a roller mixer, keeping the speed at 240r/min, stirring for 4min, and premixing; adding the rest of the formula materials into a roller type mixer, keeping the speed at 450r/min, stirring for 5min, and uniformly mixing the materials;
(2) Pressing: by adopting a one-step forming method, the surface material and the bottom material are made of the same materialThe hot-pressing die is an ejection die, the lower layer is made of raw materials, and the upper layer is a steel backing; the hot-press molding is carried out at the controlled temperature of 150 ℃ and the pressure of 450kg/cm 2 The curing time is 9min;
(3) And (3) heat treatment: carrying out heat treatment on the product after hot press molding, wherein the heat treatment temperature is 140-160 ℃, and the heat treatment time is 3-5 h;
(4) Grinding: and grinding the product to obtain a final finished product.
In the method, the rotating speed in the premixing of the raw materials can be 200, 250 or 300r/min;
the premixing time of the raw materials can be 3, 4 or 5min;
in the step (1), all the raw materials are uniformly mixed at a rotating speed of 400, 450 or 500r/min, and the stirring time can be selected from 5, 10 or 15min;
in the step (2), the control temperature of the hot-press molding can be 140, 150 or 160 ℃, and the pressure can be 400, 450 or 500kg/cm 2 The curing time can be 8, 9 or 10min;
in the step (3), the temperature is controlled to be 140, 150 or 160 ℃ during heat treatment, and the treatment time is 3, 4 or 5 hours.
The invention discovers that although Cu-ZrW 2 O 8 The brake lining has the characteristics of high heat conduction and low thermal expansion, but after the brake lining is added into a brake lining formula, the heat conduction performance and the thermal expansion performance of the obtained brake lining are not obviously improved, and the situations of uneven thermal expansion, high noise and the like occur. The invention uses carbon fiber and Cu-ZrW 2 O 8 The brake lining has the advantages of high thermal conductivity, low thermal expansion, stable friction coefficient, low abrasion, low noise and stable performance.
Example 2 verification of the Performance of the brake linings of the present invention
The present invention was carried out by experiments using brake linings prepared according to the formulations of examples 1 to 3, commercially available products, and 2 control groups, in which the formula of comparative example 1 does not contain carbon fiber, other components and amounts are the same as those of example 1, and the formula of comparative example 2 does not contain Cu-ZrW, and the thermal expansion property and friction coefficient of the brake lining are examined 2 O 8 Other components and amounts were the same as in example 1.
The experimental procedure of thermal expansibility and friction coefficient was performed according to B5763-2008, and the specific results are shown in tables 2 and 3:
table 2 thermal expansion test results
As can be seen from Table 2, the procedure was followed to test 5 points on each sample, and it was found that the thermal expansion coefficient of the brake lining of comparative example 2, to which only carbon fibers were added, was substantially identical to that of the commercially available product; comparative example 1 formulation with Cu-ZrW alone 2 O 8 The thermal expansion coefficient of the brake lining product fluctuates in a wide range of 0.39 to 0.98. Meanwhile, the noise occurrence rate of the product of the comparative example 1 is detected, the probability that the noise intensity is greater than 70dBA is 3.5 percent at most, and the probability that the noise intensity is greater than 90dBA is 1 percent. Cu-ZrW is added simultaneously to the formulations of examples 1 to 3 of the invention 2 O 8 After the carbon fiber is used, the thermal expansion coefficient of the product is maintained in a relatively stable range of 0.3-0.58%. The detection of the noise occurrence rate of the products of examples 1 to 3 revealed that the probability of the noise intensity of examples 1 to 3 of the present invention being greater than 70dBA was reduced to 2.5% or less, and the probability of the noise intensity being greater than 90dBA was reduced to 0.
TABLE 3 Friction coefficient test results
As can be seen from Table 3, the brake linings of examples 1 to 3 of the present invention have a stable coefficient of friction and small wear. Comparative example 1 in which Cu-ZrW was added alone 2 O 8 The coefficient of friction was relatively stable and the wear was slightly greater than in examples 1 to 3. Comparative example 2 in which only carbon fiber was added and Cu-ZrW was not added 2 O 8 The friction coefficient was lower, the abrasion was higher than those of examples 1 to 3, and the abrasion was substantially the same as those of the commercially available products.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (7)
1. The brake lining with high heat conductivity and low thermal expansion is characterized by being mainly prepared from the following components in parts by weight: 6 parts of phenolic resin, 12 parts of synthetic graphite, 5 parts of high-carbon crystalline flake graphite, 10 parts of precipitated barium sulfate, 15 parts of mineral fiber, 12 parts of calcium silicate whisker and Cu-ZrW 2 O 8 20 parts of calcined petroleum coke and 10 parts of carbon fiber.
2. The disc brake pad is characterized by comprising a steel backing and a high-thermal-conductivity and low-thermal-expansion brake lining connected to the steel backing, wherein the brake lining is mainly prepared from the following components in parts by weight: 6 parts of phenolic resin, 12 parts of synthetic graphite, 5 parts of high-carbon crystalline flake graphite, 10 parts of precipitated barium sulfate, 15 parts of mineral fiber, 12 parts of calcium silicate whisker and Cu-ZrW 2 O 8 20 parts of calcined petroleum coke and 10 parts of carbon fiber.
3. A method for producing a disc brake pad according to claim 2, characterized by comprising the steps of:
(1) The carbon fiber and Cu-ZrW with the formula amount 2 O 8 Adding 1/4 formula amount of phenolic resin and 1/4 formula amount of precipitated barium sulfate into a roller mixer, stirring for 3-5 min under the condition of 200-300 r/min, and premixing; adding the rest of the formula materials into a roller type mixer, stirring for 5-15 min under the condition of 400-500 r/min, and uniformly mixing the materials;
(2) The hot-pressing die is an ejection die, the lower layer is made of raw materials, and the upper layer is a steel backing; the hot-press molding temperature is 140-160 ℃, and the pressure is 400-500 kg/cm 2 The curing time is 8-10 min;
(3) Carrying out heat treatment on the product subjected to the hot press molding in the step (2);
(4) And (4) grinding the product obtained in the step (3).
4. The method for manufacturing a disc brake pad according to claim 3, wherein the heat treatment temperature in step (3) is 160 to 170 ℃ and the heat treatment time is 3 to 5 hours.
5. The method for manufacturing a disc brake pad according to claim 4, wherein in the step (1), the materials are stirred for 5min at a speed of 250r/min for premixing.
6. The manufacturing method of the disc brake pad according to claim 5, wherein the hot press molding in the step (2) is performed at a controlled temperature of 150 ℃ under a pressure of 450kg/cm 2 The curing time was 8min.
7. The method for manufacturing a disc brake pad according to claim 6, wherein the heat treatment temperature in step (3) is 165 ℃ and the heat treatment time is 4 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011232338.1A CN112343949B (en) | 2020-11-06 | 2020-11-06 | High-heat-conductivity and low-thermal-expansion brake lining and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011232338.1A CN112343949B (en) | 2020-11-06 | 2020-11-06 | High-heat-conductivity and low-thermal-expansion brake lining and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112343949A CN112343949A (en) | 2021-02-09 |
| CN112343949B true CN112343949B (en) | 2022-10-18 |
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| CN202011232338.1A Active CN112343949B (en) | 2020-11-06 | 2020-11-06 | High-heat-conductivity and low-thermal-expansion brake lining and preparation method thereof |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115819014B (en) * | 2022-12-29 | 2023-11-10 | 湖北飞龙摩擦密封材料股份有限公司 | Disc brake lining and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106117956A (en) * | 2016-06-29 | 2016-11-16 | 芜湖德业摩擦材料有限公司 | A kind of low noise high temperature resistant brake |
| CN106051005B (en) * | 2016-06-29 | 2018-06-08 | 芜湖德业摩擦材料有限公司 | A kind of high temperature resistance low-expansion brake block |
| CN109611480B (en) * | 2018-12-10 | 2021-04-13 | 湖北飞龙摩擦密封材料股份有限公司 | Low-abrasion drum type brake lining and preparation method thereof |
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