Friction material containing sodium hexafluorotitanium aluminate particles and preparation method thereof

Abstract

The invention relates to a friction material, in particular to a friction material containing sodium hexafluorotitanium aluminate particles and a preparation method of the friction material. The invention aims to provide a friction material containing sodium hexafluorotitanium aluminate particles and a preparation method thereof. The friction material has the characteristics of stable friction coefficient, low wear rate and corrosion resistance, and the preparation method is simple in process and high in production efficiency. According to the technical scheme, the friction material containing the sodium hexafluorotitanium aluminate particles comprises the following components in parts by weight: 20-25 parts of phenolic resin, 20-40 parts of the sodium hexafluorotitanium aluminate particles, 20-25 parts of reinforced fibers, 12-20 parts of a friction performance regulator and 5-10 parts of a lubricant.

Description

Technical Field

[0001] The invention relates to a friction material, in particular to a friction material containing sodium hexafluorotitanate aluminate particles and a preparation method thereof. Background Art

[0002] Friction materials are products made of materials with high and stable friction coefficients. They can generate sufficient friction force with the opposite friction to achieve the function of transmitting power and realizing the clutch; they can also generate sufficient resistance to achieve the function of brake deceleration and parking; they are usually used to manufacture brake linings, clutch facings, etc. With the rapid development of the machinery industry, the performance requirements for friction materials are getting higher and higher. Traditional friction materials often have problems such as severe wear and unstable friction coefficient under high load and high speed friction conditions. Therefore, it is of great significance to develop new high-performance friction materials. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the above-mentioned background technology and provide a friction material containing sodium hexafluorotitanate aluminate particles and a preparation method thereof; the friction material has the characteristics of stable friction coefficient, low wear rate and corrosion resistance, and the preparation method is simple in process and high in production efficiency.

[0004] The technical solution provided by the present invention is:

[0005] A friction material containing sodium hexafluorotitanate aluminate particles comprises the following components by weight: 20-25 parts of phenolic resin, 20-40 parts of sodium hexafluorotitanate aluminate particles, 20-25 parts of reinforcing fibers, 12-20 parts of friction performance regulators, and 5-10 parts of lubricants.

[0006] The reinforcing fiber is one of glass fiber, ceramic fiber and carbon fiber;

[0007] The friction performance modifier is at least one of silicon dioxide, aluminum oxide, zircon, graphite, molybdenum disulfide and antimony trisulfide;

[0008] The lubricant is one of lubricating oil and lubricating grease.

[0009] The particle size of the sodium hexafluorotitanate aluminate particles is 500-1000 meshes; the diameter of the reinforcing fibers is 150-250 μm, and the length is 700 μm-2000 μm.

[0010] The method for preparing the friction material comprises the following steps:

[0011] 1) Add phenolic resin into a hot mixer and heat it to a molten state;

[0012] 2) Add reinforcing fiber and stir evenly at a stirring speed of 500-800 r / min for 20-30 minutes;

[0013] 3) Then add sodium hexafluorotitanate aluminate particles, friction performance modifier, and lubricant, and continue stirring for 15 to 25 minutes at a stirring speed of 600 to 900 r / min;

[0014] 4) pouring the mixed material into a mold and hot pressing it at a temperature of 150-200° C. and a pressure of 25-45 MPa for 10-30 minutes;

[0015] 5) The formed friction material is heat treated at a temperature of 180 to 250° C. for 6 to 12 hours to finally obtain a finished friction material containing sodium hexafluorotitanate aluminate particles.

[0016] The preparation method of the sodium hexafluorotitanate aluminate particles is carried out according to the following steps:

[0017] 1) Aluminum titanate and sodium fluoride are put into a mixer at a molar ratio of 1:0.5-0.7 and mixed for 20-30 minutes, and then the mixture is put into a grinder for thorough grinding and mixing;

[0018] 2) The mixture of aluminum titanate and sodium fluoride is put into a high-temperature reactor for reaction, the reaction temperature is set at 1000°C to 1200°C, and inert gas argon is introduced to maintain the reaction for 4 to 6 hours; after the reaction is completed, the reactants are allowed to cool naturally to room temperature in the reactor, and the composite is taken out of the reactor and ground to obtain uniform particles.

[0019] Synthesis reaction principle: Aluminum ions (Al2TiO5) in aluminum titanate (Al 3+ ) reacts with sodium fluoride as follows:

[0020] The rotating speed of the mixer barrel is 40 to 90 revolutions per minute, and the speed of the mixer knife is 1500 to 1700 revolutions per minute.

[0021] Compared with the prior art, the present invention has the following advantages:

[0022] (1) Improve the stability of friction coefficient: The friction material with sodium hexafluorotitanate particles can maintain a relatively stable friction coefficient under different working conditions (such as different speeds, pressures and temperatures). This is crucial for application scenarios that require precise control of friction (such as industrial machinery braking, aerospace braking systems, etc.).

[0023] (2) Reduce wear rate: Due to the addition of sodium hexafluorotitanate aluminate particles, the sodium hexafluorotitanate aluminate particles have an enhanced effect on the wear resistance of the friction material matrix, which can significantly reduce the wear rate of the friction material during use, extend its service life, reduce the replacement frequency, and reduce the cost of use.

[0024] (3) Thermal decay resistance: Since the thermal conductivity of sodium hexafluorotitanate aluminate particles is relatively poor and they have a high melting point, they can maintain the shape and structural stability of the particles in a general high temperature environment and can resist the influence of high temperature, thus ensuring that the friction material maintains its original friction performance in a high temperature environment.

[0025] (4) Enhanced corrosion resistance: As an additive, sodium hexafluorotitanate aluminate particles can form a protective film on the surface of friction materials in some harsh working environments (such as humid environments with corrosive gases), preventing erosion by moisture and corrosive substances and maintaining the performance and structural integrity of the friction materials.

[0026] (5) The preparation method provided is simple and easy to implement, and has high production efficiency. DETAILED DESCRIPTION

[0027] The technical solution of the present invention is further described below through specific embodiments.

[0028] Example 1

[0029] A friction material containing sodium hexafluorotitanate aluminate particles and a preparation method thereof, comprising the following components by weight: 20 parts of phenolic resin, 25 parts of sodium hexafluorotitanate aluminate particles (750 meshes), 25 parts of glass fiber (250 μm in diameter and 700 μm in length), 20 parts of silicon dioxide and 10 parts of lubricating oil.

[0030] The method for preparing the friction material containing sodium hexafluorotitanate aluminate particles comprises the following steps:

[0031] 1) Add phenolic resin into a hot mixer and heat it to a molten state;

[0032] 2) Add glass fiber into the mixer and stir evenly at a stirring speed of 500 r / min for 30 minutes;

[0033] 3) Then add sodium hexafluorotitanate aluminate particles, silicon dioxide and lubricating oil, and continue stirring for 25 minutes at a stirring speed of 600 r / min;

[0034] 4) Pour the mixed material into a mold and perform hot pressing for 25 minutes at 165° C. and a pressure of 30 MPa.

[0035] 5) Heat treat the formed friction material at 180-200°C for 10 hours.

[0036] In the above embodiment: the particle size of the sodium hexafluorotitanate aluminate particles is ≥ 500 mesh; the diameter of the reinforcing fiber is 200 μm, and the length is 700 μm to 2000 μm.

[0037] Example 2

[0038] A friction material containing sodium hexafluorotitanate aluminate particles and a preparation method thereof, comprising the following components by weight: 25 parts of phenolic resin, 30 parts of sodium hexafluorotitanate aluminate particles (500 mesh size), 25 parts of ceramic fibers (150 μm in diameter and 2000 μm in length), 15 parts of aluminum oxide, and 5 parts of lubricating grease.

[0039] The method for preparing the friction material containing sodium hexafluorotitanate aluminate particles comprises the following steps:

[0040] 1) Add phenolic resin into a hot mixer and heat it to a molten state;

[0041] 2) Add the ceramic fiber into the mixer and stir evenly at a stirring speed of 600 r / min for 25 minutes;

[0042] 3) Then add sodium hexafluorotitanate particles, alumina, and grease, and continue stirring for 20 minutes at a stirring speed of 700 r / min;

[0043] 4) Pour the mixed material into a mold and perform hot pressing for 20 minutes at 170° C. and a pressure of 35 MPa.

[0044] 5) The formed friction material is heat treated at 190-210°C for 9 hours.

[0045] In the above embodiment: the particle size of the sodium hexafluorotitanate aluminate particles is ≥ 600 mesh; the diameter of the reinforcing fiber is 200 μm, and the length is 700 μm to 2000 μm.

[0046] Example 3

[0047] A friction material containing sodium hexafluorotitanate aluminate particles and a preparation method thereof, comprising the following components by weight: 20 parts of phenolic resin, 40 parts of sodium hexafluorotitanate aluminate particles (1000 meshes), 20 parts of carbon fiber (200 μm in diameter and 1500 μm in length), 12 parts of zircon, and 8 parts of lubricating oil.

[0048] The method for preparing the friction material containing sodium hexafluorotitanate aluminate particles comprises the following steps:

[0049] 1) Add phenolic resin into a hot mixer and heat it to a molten state;

[0050] 2) Add the carbon fiber into the mixer and stir evenly at a stirring speed of 700 r / min for 20 minutes;

[0051] 3) Then add sodium hexafluorotitanate aluminate particles, zircon, and lubricating oil, and continue stirring for 15 minutes at a stirring speed of 900 r / min;

[0052] 4) Pour the mixed material into a mold and perform hot pressing for 15 minutes at 175°C and a pressure of 10 MPa.

[0053] 5) Heat treat the formed friction material at 180-220°C for 12 hours.

[0054] In the above embodiment: the preparation method of the sodium hexafluorotitanate aluminate particles is carried out according to the following steps:

[0055] 1) Aluminum titanate and sodium fluoride are put into a mixer at a molar ratio of 1:0.5-0.7 and mixed for 20-30 minutes, and then the mixture is put into a grinder for thorough grinding and mixing;

[0056] 2) The mixture of aluminum titanate and sodium fluoride is put into a high-temperature reactor for reaction, the reaction temperature is set at 1000°C to 1200°C, and inert gas argon is introduced to maintain the reaction for 4 to 6 hours; after the reaction is completed, the reactants are allowed to cool naturally to room temperature in the reactor, and the composite is taken out of the reactor and ground to obtain uniform particles.

[0057] 3) Synthesis reaction principle: Aluminum ions (Al2TiO5) in aluminum titanate (Al 3+ ) reacts with sodium fluoride:

[0058] The rotating speed of the mixer barrel is 40 to 90 revolutions per minute, and the speed of the mixer knife is 1500 to 1700 revolutions per minute.

[0059] The friction and wear performance test results of the friction material obtained by the above processing method are as follows:

[0060]

[0061]

[0062] From the data in the above table, we can see that the friction, wear, high temperature resistance and other properties are significantly better than the comparative products (similar products at home and abroad); while the wear rate is significantly lower than the comparative products (similar products at home and abroad).

Claims

1. A friction material containing sodium hexafluorotitanate aluminate particles, comprising the following components by weight: 20 to 25 parts of phenolic resin, 20 to 40 parts of sodium hexafluorotitanate aluminate particles, 20 to 25 parts of reinforcing fiber, 12 to 20 parts of friction performance regulator, and 5 to 10 parts of lubricant.

2. The friction material containing sodium hexafluorotitanate aluminate particles according to claim 1, characterized in that: The reinforcing fiber is one of glass fiber, ceramic fiber and carbon fiber; The friction performance modifier is at least one of silicon dioxide, aluminum oxide, zircon, graphite, molybdenum disulfide and antimony trisulfide; The lubricant is one of lubricating oil and lubricating grease.

3. The friction material containing sodium hexafluorotitanate aluminate particles according to claim 2, characterized in that: The particle size of the sodium hexafluorotitanate aluminate particles is 500-1000 meshes; the diameter of the reinforcing fibers is 150-250 μm, and the length is 700 μm-2000 μm.

4. The method for preparing the friction material containing sodium hexafluorotitanate aluminate particles according to claim 1, comprising the following steps: 1) Add phenolic resin into a hot mixer and heat it to a molten state; 2) Add reinforcing fiber and stir evenly at a stirring speed of 500-800 r / min for 20-30 minutes; 3) Then add sodium hexafluorotitanate aluminate particles, friction performance modifier, and lubricant, and continue stirring for 15 to 25 minutes at a stirring speed of 600 to 900 r / min; 4) pouring the mixed material into a mold and hot pressing it at a temperature of 150-200° C. and a pressure of 25-45 MPa for 10-30 minutes; 5) The formed friction material is heat treated at a temperature of 180 to 250° C. for 6 to 12 hours to finally obtain a finished friction material containing sodium hexafluorotitanate aluminate particles.

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