Preparation method of sodium hexafluorotitanium aluminate particles for friction material

Abstract

The invention relates to a friction material. The invention aims to provide the preparation method of the sodium hexafluorotitanium aluminate particles for the friction material, the material has good wear resistance and high temperature resistance, and the friction material using the sodium hexafluorotitanium aluminate particles as an additive can meet the use requirements in different fields. According to the technical scheme, the preparation method of the sodium hexafluorotitanium aluminate particles for the friction material comprises the following steps that 1, aluminum titanate and sodium fluoride are put into a mixer according to the molar ratio of 1: (0.5-0.7) to be mixed for 20-30 min, and then the mixture is put into a grinding machine to be fully ground and mixed; (2) putting a mixture of aluminum titanate and sodium fluoride into a high-temperature reaction furnace for reaction, setting the reaction temperature to be 1000-1200 DEG C, and simultaneously introducing inert gas argon to keep the reaction for 4-6 hours; and after the reaction is finished, naturally cooling reactants in the reaction furnace to room temperature, taking out the composition from the reaction furnace, and grinding to obtain a granular mixture (named as sodium hexafluorotitanium aluminate particles).

Description

Technical Field

[0001] The invention relates to a friction material, in particular to a method for preparing sodium hexafluorotitanate aluminate particles used as a friction material additive. Background Art

[0002] Friction materials usually require additives with excellent performance to improve friction performance, stability and durability. However, traditional friction material additives have problems such as excessive wear and unstable friction coefficient under complex working conditions such as high temperature and high load, which greatly affects the performance and service life of friction materials. Therefore, finding and developing friction material additives with better performance has always been the goal pursued by technical personnel in the industry. 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 method for preparing sodium hexafluorotitanate aluminate particles for friction material. The material has good wear resistance and high temperature resistance. The friction material using it as an additive can meet the use requirements in different fields.

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

[0005] A method for preparing sodium hexafluorotitanate aluminate particles for friction material is carried out according to the following steps:

[0006] 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;

[0007] 2) putting the mixture of aluminum titanate and sodium fluoride 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 then the synthesis is taken out of the reactor and ground to obtain a granular mixture (named sodium hexafluorotitanate aluminate particles).

[0008] The particle size of the sodium hexafluorotitanate aluminate particles is 325-1000 meshes.

[0009] The mixing time in step 1) is 20 to 30 minutes; the rotation 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.

[0010] The synthesis reaction principle of sodium hexafluorotitanate particles: the aluminum ions (Al 3+ ) reacts with sodium fluoride as follows:

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] (1) Reduce wear rate: Due to the wear resistance of sodium hexafluorotitanate aluminate particles themselves and their reinforcing effect on the friction material matrix, the wear rate of the friction material during use can be significantly reduced, its service life can be extended, the replacement frequency can be reduced, and the use cost can be reduced.

[0013] (2) Thermal decay resistance: Since the thermal conductivity of sodium hexafluoroaluminotitanate particles is relatively poor and they have a high melting point, it means that in a general high temperature environment, the particle shape and structural stability can be maintained, and to a certain extent, they can resist the influence of high temperature, ensuring that the friction material maintains its original friction performance in a high temperature environment.

[0014] (3) Enhanced corrosion resistance: In some harsh working environments (such as humid environments with corrosive gases), sodium hexafluorotitanate aluminate particles can form a protective film on the surface of the friction material to prevent erosion by moisture and corrosive substances, thereby maintaining the performance and structural integrity of the friction material.

[0015] (4) Improving the stability of the friction coefficient: Under different working conditions (such as different speeds, pressures and temperatures), the friction material using sodium hexafluorotitanate aluminate particles as an additive can maintain a relatively stable friction coefficient; it can be used in application scenarios that require precise control of friction (such as industrial machinery braking, aerospace braking systems, etc.). DETAILED DESCRIPTION

[0016] The technical solution of the present invention is further described below through specific embodiments.

[0017] Example 1

[0018] 1) Aluminum titanate and sodium fluoride were put into a mixer at a molar ratio of 1:0.5 and mixed for 15 minutes, and then the mixture was put into a grinder for grinding and mixing for 20 minutes to allow the two materials to be fully ground and mixed;

[0019] 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, and inert gas argon is introduced to maintain the reaction for 4 hours; after the reaction is completed, the reactants are naturally cooled to room temperature in the reactor, and then the synthesis product is taken out of the reactor and ground to obtain uniform particles with a particle size of 325 mesh.

[0020] Example 2

[0021] 1) Aluminum titanate and sodium fluoride were put into a mixer at a molar ratio of 1:0.7 and mixed for 18 minutes, and then the mixture was put into a grinder for grinding and mixing for 25 minutes to allow the two materials to be fully ground and mixed evenly;

[0022] 2) The mixture of aluminum titanate and sodium fluoride is put into a high-temperature reactor for reaction, the reaction temperature is set at 1100°C, and inert gas argon is introduced to maintain the reaction for 5 hours; after the reaction is completed, the reactants are naturally cooled to room temperature in the reactor, and then the synthesis product is taken out of the reactor and ground to obtain uniform particles with a particle size of 500 mesh.

[0023] Example 3

[0024] 1) Aluminum titanate and sodium fluoride were put into a mixer at a molar ratio of 1:0.6 and mixed for 20 minutes, and then the mixture was put into a grinder for grinding and mixing for 30 minutes to allow the two materials to be fully ground and mixed evenly;

[0025] 2) The mixture of aluminum titanate and sodium fluoride is put into a high-temperature reactor for reaction, the reaction temperature is set at 1200°C, and inert gas argon is introduced to maintain the reaction for 6 hours; after the reaction is completed, the reactants are naturally cooled to room temperature in the reactor, and then the synthesis product is taken out of the reactor and ground to obtain uniform particles with a particle size of 1000 mesh.

[0026] The friction and wear performance test results of the sodium hexafluorotitanate aluminate particles obtained by the above processing method are as follows:

[0027]

[0028] It can be seen from the test data that the sodium hexafluorotitanate aluminate particles obtained in the present invention still have a relatively high friction coefficient in the high temperature stage, and the material after the high temperature friction stage still maintains good friction performance.

Claims

1. A method for preparing sodium hexafluorotitanate aluminate particles for friction material, comprising the following steps: 1) Aluminum titanate and sodium fluoride are mixed in a mixer at a molar ratio of 1:0.5-0.7, and then the mixture is put into a grinder for grinding and mixing, so that the two materials can be fully ground and mixed evenly; 2) putting the mixture of aluminum titanate and sodium fluoride into a high-temperature reactor for reaction, the reaction temperature is set between 1000°C and 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 then the composite is taken out of the reactor and ground to obtain uniform particles.

2. The method for preparing sodium hexafluoroaluminotitanate particles according to claim 1, characterized in that: The mixing time in step 1) is 20 to 30 minutes; the mixing speed is: the rotation 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.

3. The method for preparing sodium hexafluoroaluminotitanate particles according to claim 2, characterized in that: The particle size of the sodium hexafluorotitanate aluminate particles is 325-1000 meshes.

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