阅读说明：本技术 一种高硅氧陶瓷纤维电动车刹车片及其加工方法 (High-silica ceramic fiber electric vehicle brake pad and processing method thereof ) 是由 孙弘扬 盖峻源 杜俊 李艳 于 2020-06-05 设计创作，主要内容包括：本发明公开了一种高硅氧陶瓷纤维电动车刹车片及其加工方法,刹车片包括以下重量份的组分：20-35重量份的高硅氧陶瓷纤维,4-10重量份的改性酚醛树脂、3-6重量份的六钛酸钾晶须、4-8重量份的硅藻土、4-8重量份的复合硫化物、12-19重量份的精细硫酸钡,由于高硅氧陶瓷纤维是一种摩擦性能优良的陶瓷纤维,其纤维表面呈圆柱形,具备较高的气孔率,并且气孔中的空气具备良好的隔热作用,因此采用高硅氧陶瓷纤维制成的电动车刹车在具有较好的摩擦性能的同时,还具备较好的耐高温性能,从而具有较好的制动性能。(The invention discloses a high silica ceramic fiber electric vehicle brake pad and a processing method thereof, wherein the brake pad comprises the following components in parts by weight: 20-35 parts of high silica ceramic fiber, 4-10 parts of modified phenolic resin, 3-6 parts of potassium hexatitanate whisker, 4-8 parts of diatomite, 4-8 parts of composite sulfide and 12-19 parts of fine barium sulfate, wherein the high silica ceramic fiber is a ceramic fiber with excellent friction performance, the surface of the fiber is cylindrical and has high porosity, and air in pores has good heat insulation effect, so that the electric vehicle brake made of the high silica ceramic fiber has good friction performance, good high temperature resistance and good braking performance.)

1. The high silica ceramic fiber electric vehicle brake pad is characterized by comprising the following components in parts by weight: 20-35 parts of high silica ceramic fiber, 4-10 parts of modified phenolic resin, 3-6 parts of potassium hexatitanate whisker, 4-8 parts of diatomite, 4-8 parts of composite sulfide and 12-19 parts of fine barium sulfate.

2. The high silica ceramic fiber electric vehicle brake pad of claim 1, wherein the brake pad further comprises other fillers.

3. The high silica ceramic fiber electric vehicle brake pad as claimed in claim 1, wherein the high silica ceramic fiber has a diameter of 3-6 μm and a length of 100-220 mm.

4. A method for processing high silica ceramic fiber electric vehicle brake pads according to any one of claims 1 to 3, comprising the following steps:

s1, preparing raw materials of the brake pad;

s2, putting the raw materials into a hot-pressing die to be pressed and molded to obtain a first intermediate product;

s3, performing heat treatment on the first intermediate product to obtain a second intermediate product;

and S4, machining and spraying the second intermediate product to obtain a finished product.

5. The processing method according to claim 3, wherein the raw material is obtained by weighing the high silica ceramic fiber, the modified phenolic resin, the potassium hexatitanate whisker, the diatomaceous earth, the complex sulfide and the fine barium sulfate in a weight ratio, and uniformly mixing the weighed materials.

6. The process according to claim 5, characterized in that the stirring time is 10 to 15 minutes.

7. The process of claim 3 wherein the hot press mold is heated to a temperature of 165-185 ℃.

8. The process according to claim 3, wherein the pressure of the hot press mold is 10 to 13 MPa.

9. The process according to claim 3, wherein the hot press mold has a pressing time of 6 to 8 minutes.

10. The process of claim 3, wherein said heat treatment comprises a first stage, a second stage and a third stage; in the first stage, the temperature of the heat treatment is raised from room temperature to 60 ℃ and then is kept for 1 hour; in the second stage, the temperature of the heat treatment is raised from 60 ℃ to 120 ℃ and then is kept for 2 hours; in the third stage, the temperature of the heat treatment is raised from 120 ℃ to 185 ℃ and is kept for 2 hours, and then the temperature is cooled to room temperature.

Technical Field

The invention belongs to the field of automobile braking, and particularly relates to a high silica ceramic fiber electric vehicle brake pad and a processing method thereof.

Background

The automobile brake system mainly comprises a brake pad, a brake disc and a brake caliper. Compared with the traditional gasoline vehicle, the electric vehicle has the advantages of low manufacturing cost, high conversion efficiency of the motor, convenient maintenance and the like, and is gradually favored by consumers. On the other hand, the extremely fast response speed and the start-stop speed of the motor also put forward more severe requirements on the braking system, in particular to more sensitive braking touch feeling and high temperature resistance.

Traditional brake block is in the in-service use in-process, before the vehicle reaches a higher speed, along with the process that the car starts and speed promotes, the brake block can have a preheating process to there are better braking performance and NVH performance. The fast response speed characteristic of the electric vehicle requires that the brake pad has good performance under any condition, and the performance of the brake pad in the related technology cannot meet the requirements of users, so that the high-performance brake pad for the electric vehicle is needed to be developed according to the performance characteristics of the electric vehicle.

Disclosure of Invention

The first objective of the present invention is to provide a high silica ceramic fiber electric vehicle brake pad to solve the above problems, because the inventor finds out in multiple tests of finding a new material suitable for electric vehicle brake pads that the high silica ceramic fiber is a ceramic fiber with excellent friction performance, the surface of the high silica ceramic fiber is cylindrical, and has high porosity, and because the air in the pores has good heat insulation effect, the electric vehicle brake made of the high silica ceramic fiber has good friction performance and good high temperature resistance, and thus has good braking performance.

The second purpose of the invention is to provide a processing method of the brake pad.

The invention realizes the aim through the following technology, and the high silica ceramic fiber electric vehicle brake pad is characterized by comprising the following components in parts by weight: 20-35 parts of high silica ceramic fiber, 4-10 parts of modified phenolic resin, 3-6 parts of potassium hexatitanate whisker, 4-8 parts of diatomite, 4-8 parts of composite sulfide and 12-19 parts of fine barium sulfate.

Preferably, the brake pad further comprises other fillers.

Preferably, the high silica ceramic fiber has a diameter of 3-6 microns and a length of 100-220 mm.

A processing method of a high silica ceramic fiber electric vehicle brake pad is characterized by comprising the following steps:

s1, preparing raw materials of the brake pad;

s2, putting the raw materials into a hot-pressing die to be pressed and molded to obtain a first intermediate product;

s3, performing heat treatment on the first intermediate product to obtain a second intermediate product;

and S4, machining and spraying the second intermediate product to obtain a finished product.

Preferably, the raw materials are obtained by respectively weighing the high silica ceramic fiber, the modified phenolic resin, the potassium hexatitanate whisker, the diatomite, the composite sulfide and the fine barium sulfate according to the weight ratio, and uniformly stirring and mixing the materials.

Preferably, the stirring time is 10 to 15 minutes.

Preferably, the heating temperature of the hot-pressing mold is 165-185 ℃.

Preferably, the pressure of the hot pressing mold is 10 to 13 Mpa.

Preferably, the pressing time of the hot press mold is 6 to 8 minutes.

Preferably, the heat treatment comprises a first stage, a second stage and a third stage; in the first stage, the temperature of the heat treatment is raised from room temperature to 60 ℃ and then is kept for 1 hour; in the second stage, the temperature of the heat treatment is raised from 60 ℃ to 120 ℃ and then is kept for 2 hours; in the third stage, the temperature of the heat treatment is raised from 120 ℃ to 185 ℃ and is kept for 2 hours, and then the temperature is cooled to room temperature.

The invention has the beneficial effects that:

(1) the brake pad comprises the following components in parts by weight: 20-35 parts of high silica ceramic fiber, 4-10 parts of modified phenolic resin, 3-6 parts of potassium hexatitanate whisker, 4-8 parts of diatomite, 4-8 parts of composite sulfide and 12-19 parts of fine barium sulfate, wherein the high silica ceramic fiber is a ceramic fiber with excellent friction performance, the surface of the fiber is cylindrical and has high porosity, and air in pores has good heat insulation effect, so that the electric vehicle brake made of the high silica ceramic fiber has good friction performance, good high temperature resistance and good braking performance.

(2) The invention also provides a processing method of the brake pad, the brake pad prepared by the method has low production cost, is convenient to process and form, and the formed product has good performance and can meet the use requirement.

Drawings

The invention is further illustrated with reference to the following figures and examples.

FIG. 1 is a flow chart of a processing method of a high silica ceramic fiber electric vehicle brake pad provided by the invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the related art, with the continuous development of electric vehicle technology, electric vehicles are gradually accepted by consumers, and because electric vehicles have a fast response speed characteristic, the brake pad is required to have better performance under any condition, and the performance of the brake pad in the related art cannot meet the requirements, so that a high-performance electric vehicle brake pad needs to be developed according to the performance characteristics of the electric vehicle

In the process of searching for a new material suitable for the brake pad of the electric vehicle, the inventor conducts a plurality of tests and creatively discovers that the high silica ceramic fiber material can be applied to the brake pad of the electric vehicle in the test process.

According to the embodiment of the invention, the high silica ceramic fiber electric vehicle brake pad comprises the following components in parts by weight: 20-35 parts of high silica ceramic fiber, 4-10 parts of modified phenolic resin, 3-6 parts of potassium hexatitanate whisker, 4-8 parts of diatomite, 4-8 parts of composite sulfide and 12-19 parts of fine barium sulfate, wherein the high silica ceramic fiber is a ceramic fiber with excellent friction performance, the surface of the fiber is cylindrical and has high porosity, and air in pores has good heat insulation effect, so that the electric vehicle brake made of the high silica ceramic fiber has good friction performance, good high temperature resistance and good braking performance.

Specifically, the high silica ceramic fiber can also be referred to as high silica fiber for short, and refers to high purity silica amorphous continuous fiber, wherein the silica content is 96-98%, the continuous temperature resistance is 1000 ℃, the transient temperature resistance is 1400 ℃, and the finished product mainly comprises continuous yarn, rope belt, sleeve, mesh cloth and stitch-bonded product. The high silica fiber can keep good strength and elasticity for a long time at 1000 ℃, and is an effective heat barrier for ultrahigh-temperature heat flow and jet flame and a reliable protection device for personnel facilities; the high-silicon-oxygen-content high-carbon high-silicon-oxygen-content high-silicon-oxygen ceramic fiber brake pad has low heat conductivity, good resistance to high thermal shock, inertia to most of chemicals, good corrosion resistance to compounds at high temperature, corrosive minerals and weak alkaline melting alloy, and can normally and continuously work under the conditions of high heat and strong radiation, so that the high-silicon-oxygen ceramic fiber brake pad can be applied to the brake pad to obviously improve the high-temperature resistance of the brake pad.

Further, in order to maintain good high temperature resistance of the brake pad, the diameter of the high silica ceramic fiber in the brake pad is 3-6 microns, and the length is 100-220 mm.

The modified phenolic resin is phenolic resin prepared by modifying different compounds or polymers by a chemical or physical method (such as copolymerization or mechanical mixing), and the aim of modifying the phenolic resin is mainly to improve the brittleness or other physical properties, improve the bonding property of the modified phenolic resin to a fiber reinforced material, improve the forming process conditions of a composite material and the like. The modification is generally by the following route: the phenolic hydroxyl group is blocked. The phenolic hydroxyl groups of phenolic resins do not typically participate in chemical reactions during the resin manufacturing process. The phenolic hydroxyl groups left in the molecular chain of the resin are easy to absorb water, so that the electrical property, alkali resistance and mechanical property of the cured product are reduced. Meanwhile, phenolic hydroxyl is easy to generate quinone or other structures under the action of heat or ultraviolet light, so that color is not uniformly changed. ② introducing other components. The components which have chemical reaction with the phenolic resin or have better compatibility with the phenolic resin are introduced to separate or surround the hydroxyl, thereby achieving the purposes of changing the curing speed and reducing the water absorption. The introduction of other high molecular components can combine the advantages of two high molecular materials. Therefore, the friction stability of the brake pad can be improved after the modified phenolic resin is added into the raw material of the brake pad.

The potassium titanate whisker refers to an inorganic high molecular compound with a chemical formula of K2O. nTiO2 or K2TinO2n +1 and a needle-shaped micro appearance, wherein n is 2, 4, 6 and 8, and is respectively called potassium dititanate whisker, potassium tetratitanate whisker, potassium hexatitanate whisker and potassium octatitanate whisker. The potassium titanate whisker has the following advantages: (1) is a particularly excellent single crystal (1/1000 with size only of glass fiber); (2) high strength and good rigidity (same as the strength and rigidity of graphite); (3) low hardness (equivalent to aluminum only); (4) excellent aspect ratio (diameter of 0.1 to 0.6 μm, length of 3 to 20 μm); (5) the abrasion resistance is good. The brake pad in the embodiment adopts the potassium hexatitanate whisker, and compared with other types of potassium titanate whiskers, the strength and the wear resistance of the brake pad can be better improved.

Diatomaceous earth is a siliceous rock, a biogenic siliceous sedimentary rock, which is mainly composed of remains of ancient diatoms. The diatomite has the characteristics of light capacity, neutral pH value, no toxicity and the like, and also has excellent extensibility, and has high impact strength, tensile strength, tearing strength, light weight, soft and good internal wear, high pressure resistance and other excellent effects. Therefore, the strength and the performance of the brake pad can be improved after the diatomite is added into the raw materials of the brake pad.

Sulfide refers to a type of compound formed by a metal or nonmetal with sulfur, which has a stronger electropositivity. The composite sulfide is a material formed by combining sulfide and other materials, and can be selected according to actual requirements.

Barium sulfate is also known as barite. The fine barium sulfate is barium sulfate with fine particles, and is used as a filler of a raw material of the brake pad, so that the synergistic effect of all components can be fully exerted, and the brake pad can have stable friction coefficient, lower wear rate, better heat resistance and other performances.

According to the high silica ceramic fiber electric vehicle brake pad provided by the embodiment of the invention, the high silica ceramic fiber is a ceramic fiber with excellent friction performance, the surface of the fiber is cylindrical, the high silica ceramic fiber has high porosity, and air in pores has a good heat insulation effect, so that an electric vehicle brake made of the high silica ceramic fiber has good friction performance and good high temperature resistance, and further has good braking performance.

In some embodiments, the brake pad further includes other fillers. The filler is one of the main components of the brake pad material and comprises various friction performance regulators and other compounding agents. The brake pad has the main function of adjusting the friction and wear performance, high-temperature friction coefficient, heat dissipation and noise of the brake pad material in multiple aspects, so that the brake pad can better meet the braking requirements under various extreme working conditions. For example, in the preparation of the brake pad, graphite, zinc sulfide, stannous sulfide, silicon oxide, aluminum oxide, iron yellow and the like may be added according to the requirements in addition to the above-mentioned components.

As shown in fig. 1, the processing method of the high silica ceramic fiber electric vehicle brake pad according to the embodiment of the invention comprises the following steps:

s1, preparing raw materials of the brake pad;

s2, putting the raw materials into a hot-pressing die to be pressed and molded to obtain a first intermediate product;

s3, performing heat treatment on the first intermediate product to obtain a second intermediate product;

and S4, machining and spraying the second intermediate product to obtain a finished product.

The brake pad prepared by the steps has low production cost, is convenient to machine and form, and the formed product has good performance and can meet the use requirement.

Specifically, in step S1, the high silica ceramic fiber, the modified phenolic resin, the potassium hexatitanate whisker, the diatomaceous earth, the complex sulfide, and the fine barium sulfate are weighed and mixed uniformly by weight ratio to obtain the raw material.

In the actual mixing process, in order to obtain a better mixing effect, the components are generally put into a plow-rake mixer for stirring, and the stirring time is 10-15 minutes.

In addition, in step S2, the heating temperature of the hot pressing mold is 165-185 ℃, the pressurizing pressure of the hot pressing mold is 10-13MPa, and the pressing time of the hot pressing mold is 6-8 minutes, so that the first intermediate product has better molding quality.

In step S3, the first intermediate product needs to be subjected to a heat treatment to obtain a second intermediate product, the heat treatment refers to a metal hot working process in which the material is in a solid state, and the material is heated, kept warm and cooled to obtain a desired structure and properties, and in this embodiment, the heat treatment includes a first stage, a second stage and a third stage; in the first stage, the temperature of the heat treatment is raised from room temperature to 60 ℃ and then is kept for 1 hour; in the second stage, the temperature of the heat treatment is raised from 60 ℃ to 120 ℃ and then is kept for 2 hours; in the third stage, the temperature of the heat treatment is raised from 120 ℃ to 185 ℃, then the temperature is kept for 2 hours, and then the brake pad is cooled to the room temperature, so that the brake pad can obtain better heat treatment effect, and the corresponding physical property and chemical property can be improved.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.