CN104729941A - Test method for friction abrasion performance of CrTiAlN film under abrasive particle lubrication condition - Google Patents

Abstract

The invention relates to a test method for friction abrasion performance of a CrTiAlN film under an abrasive particle lubrication condition. The test method comprises the steps of coating the surface of mold steel with a CrTiAlN film by utilizing a non-balance magnetron sputtering to be used as a to-be-tested sample, then preparing an abrasive particle lubricating medium, and then carrying out the friction abrasion test for the to-be-tested sample. The test material is simple and easy to fetch and convenient to operate; by adding the abrasive particles, the abrasive chippings under a real service condition can be simulated, and the experiment data is more referable.

Description

A test method for friction and wear performance of CrTiAlN film under abrasive lubrication conditions

technical field

The invention relates to a test method, in particular to a simple and accurate test method for the friction and wear performance of CrTiAlN thin films under abrasive grain lubrication conditions.

Background technique

Hard coatings such as CrTiAlN film on the surface of die steel have high hardness and wear resistance, excellent high temperature oxidation resistance and corrosion resistance, and high bonding strength, which can significantly improve the service life of the die. The evaluation of wear resistance of coatings is the main problem encountered in industrial applications. At present, the commonly used methods include dry friction and wear test method, lubricated friction and wear test method, and abrasive friction and wear test method, each of which has its own characteristics. However, due to the complexity of the actual service conditions of the workpiece, the single test method has certain limitations and cannot accurately measure the required data, which has caused certain difficulties in choosing simple, accurate and intuitive friction and wear properties.

Contents of the invention

Beneficial effects of the present invention provide a simple and accurate method for testing the friction and wear properties of CrTiAlN films under the condition of abrasive grain lubrication in order to solve the defects that the existing methods for testing the friction and wear properties of CrTiAlN films are complicated and have many steps.

In order to achieve the above object, the present invention adopts the following technical solutions:

A method for testing the friction and wear properties of CrTiAlN thin films under abrasive lubrication conditions, the test method comprises using unbalanced magnetron sputtering to plate CrTiAlN thin films on the surface of die steel as samples to be tested, and then preparing abrasive lubrication media, and then to be tested The friction and wear test was carried out.

As a preference, the preparation process of the abrasive lubricating medium is as follows: mix lubricating oil and deionized water at a volume ratio of 1:8-12 to form a lubricating liquid; add mixed abrasive grains to the above lubricating liquid, stir and mix evenly to obtain an abrasive grain lubricating medium.

Preferably, the mixed abrasive grains are one of silicon dioxide and aluminum oxide, silicon dioxide and graphene, silicon dioxide and silicon carbide, aluminum oxide and graphene.

Preferably, the added abrasive grains have a particle size of 3-50 μm.

Preferably, the mass ratio of silica and alumina added to the abrasive lubricating medium to the lubricating liquid is 1:1-1.25.

Preferably, a friction and wear experiment is carried out, and the experimental parameters are set as follows: a rotating speed of 300 rpm, a time of 20 minutes, and loads of 5N, 10N, and 15N, respectively.

Preferably, the mass ratio of the two components in the mixed abrasive grains is 1:1-1.5.

The beneficial effects of the present invention are 1) the test material of the present invention is simple and easy to obtain, and the operation is convenient; 2) adding abrasive grains is beneficial to simulate the wear debris generated under actual service conditions, and the experimental data is more referenced.

Detailed ways

The technical solution of the present invention will be further specifically described below through specific examples.

In the present invention, unless otherwise specified, the raw materials and equipment used can be purchased from the market or commonly used in this field.

The methods in the following examples, unless otherwise specified, are conventional methods in the art.

Example 1

Raw materials: 5ml of 20# engine oil, 45ml of deionized water, 25g each of silicon dioxide _SiO2 abrasive grains and aluminum oxide abrasive grains with a particle size of 3 μm, and CrTIAlN film samples coated on the surface of Cr12MoV.

First, mix 20# engine oil with deionized water and vibrate evenly, then add mixed abrasive grains of silicon dioxide SiO ₂ and aluminum oxide to it, and mechanically stir evenly to prepare abrasive lubricating medium. Fix the sample on the ball-on-disk friction and wear testing machine, set the test load to 10N, the speed to 300 rpm, and the test time to 20 minutes. Add the abrasive lubricant until the entire sample is covered, and start the test.

The test results are: the measured average friction coefficient is 0.24; after the test, the surface of the sample shows abrasive wear morphology, with pores, cracks and other defects; during the patterning process, the friction curve is relatively stable, and the friction coefficient value is stable.

Example 2

Raw materials: 5ml of 20# engine oil, 45ml of deionized water, 25g of silicon dioxide SiO ₂ abrasive grains with a particle size of 10μm and 25g of graphene, CrTIAlN film samples coated on the surface of Cr12MoV.

First, mix 20# engine oil with deionized water and vibrate evenly, then add mixed abrasive grains of silicon dioxide SiO ₂ and graphene to it, and mechanically stir evenly to prepare abrasive lubricating medium. Fix the sample on the ball-on-disk friction and wear testing machine, set the test load to 5N, the speed to 300 rpm, and the test time to 20 minutes, add abrasive lubricant until the entire sample is covered, and start the test.

Test results: The measured average coefficient of friction is 0.35; after the test, the surface of the sample shows abrasive wear morphology with large pores; during the experiment, the friction curve fluctuates slightly.

Example 3

Raw materials: 5ml of 20# engine oil, 45ml of deionized water, 25g of silicon dioxide SiO ₂ abrasive grains with a particle size of 50μm and 25g of silicon carbide, CrTIAlN thin film samples coated on the surface of Cr12MoV.

First, mix 20# engine oil with deionized water and vibrate evenly, then add mixed abrasive grains of silicon dioxide SiO ₂ and silicon carbide to it, and mechanically stir evenly to prepare abrasive lubricating medium. Fix the sample on the ball-on-disk friction and wear testing machine, set the test load to 5N, 10N, 15N, and the speed to 300 rpm, and the test time is until the coating is destroyed (subject to the drastic change of the friction coefficient), and add abrasive particles to lubricate Let the liquid cover the entire sample and start the test.

The test results are as follows: the measured average friction coefficients are 0.35, 0.36, and 0.48 respectively, and the friction coefficient increases with the increase of load; the time for the coating to wear completely decreases with the increase of load.

Claims (7)

1. CrTiAlN film friction and wear behavior method of testing under an abrasive particle lubricating condition, it is characterized in that, described method of testing comprises and utilizes non-balance magnetically controlled sputter at mould steel plated surface CrTiAlN film as sample to be tested, prepare abrasive particle lubricant medium again, then friction-wear test is carried out to sample to be tested.

2. CrTiAlN film friction and wear behavior method of testing under a kind of abrasive particle lubricating condition according to claim 1, it is characterized in that, described abrasive particle lubricant medium preparation process is as follows: be that 1:9 mix with deionized water according to volume ratio by lubricating oil, forms lubricating fluid; In above-mentioned lubricating fluid, add mixing abrasive particle, be uniformly mixed and obtain abrasive particle lubricant medium.

3. CrTiAlN film friction and wear behavior method of testing under a kind of abrasive particle lubricating condition according to claim 2, it is characterized in that, described mixing abrasive particle is the one in silicon dioxide and aluminium oxide, silicon dioxide and Graphene, silicon dioxide and silit, aluminium oxide and Graphene.

4. CrTiAlN film friction and wear behavior method of testing under a kind of abrasive particle lubricating condition according to claim 3, is characterized in that, the particle diameter of the abrasive particle added is 3-50 μm.

5. CrTiAlN film friction and wear behavior method of testing under a kind of abrasive particle lubricating condition according to claim 2, is characterized in that, the mass ratio of the silicon dioxide added in abrasive particle lubricant medium and the quality of aluminium oxide and lubricating fluid is 1:1.

6. CrTiAlN film friction and wear behavior method of testing under a kind of abrasive particle lubricating condition according to claim 1 or 2 or 3 or 5, it is characterized in that, carry out frictional wear experiment, experiment parameter is set to: rotating speed 300 revs/min, 20 minutes time, load is: 5-15N.

7. under a kind of abrasive particle lubricating condition according to claim 3 or 4, CrTiAlN film friction and wear behavior method of testing, is characterized in that, in mixing abrasive particle, the mass ratio of two kinds of compositions is 1:1.