阅读说明：本技术 一种含有高碳纤维的锡基巴氏合金涂层的制备方法 (Preparation method of tin-based Babbitt alloy coating containing high carbon fibers ) 是由 陈卓君 祁习帆 张旭 于 2020-06-29 设计创作，主要内容包括：本发明公开了一种含有高碳纤维的锡基巴氏合金涂层的制备方法,包括如下步骤：S1、在锡基巴氏合金粉中加入金属钴Co粉、碳化钨WC粉和碳纤维粉末,其中金属钴Co粉添加量为8-20％；碳化钨WC粉的添加量为4％-10％；碳纤维粉末的添加量为20-24％；S2、将锡基巴氏合金粉、金属钴Co粉、碳化钨WC粉和碳纤维粉末均加入到混料机内充分混合6-8小时,得到喷涂粉。本发明通过在锡基巴氏合金粉中加入金属钴Co粉、碳化钨WC粉和碳纤维粉,并将其进行混合后使用等离子喷涂设备喷涂在H62黄铜表明,然后进行磨损试验,试验结果表明有效的提高的锡基巴氏合金的表面硬度,可使轴承载较大载荷的进行长时间的运转。(The invention discloses a preparation method of a tin-based babbitt metal coating containing high carbon fibers, which comprises the following steps: s1, adding metal cobalt Co powder, tungsten carbide WC powder and carbon fiber powder into the tin-based Babbitt metal powder, wherein the addition amount of the metal cobalt Co powder is 8-20%; the addition amount of the tungsten carbide WC powder is 4-10%; the addition amount of the carbon fiber powder is 20-24%; s2, adding the tin-based Babbitt metal powder, the metal cobalt Co powder, the tungsten carbide WC powder and the carbon fiber powder into a mixer, and fully mixing for 6-8 hours to obtain the spray powder. According to the invention, metal cobalt Co powder, tungsten carbide WC powder and carbon fiber powder are added into tin-based babbitt metal powder, mixed and sprayed on H62 brass by using plasma spraying equipment, and then an abrasion test is carried out, and a test result shows that the surface hardness of the tin-based babbitt metal is effectively improved, so that the bearing can run for a long time under a large load.)

1. A preparation method of a tin-based babbitt metal coating containing high carbon fiber is characterized by comprising the following steps:

s1, adding metal cobalt Co powder, tungsten carbide WC powder and carbon fiber powder into the tin-based Babbitt metal powder, wherein the addition amount of the metal cobalt Co powder is 8-20%; the addition amount of the tungsten carbide WC powder is 4-10%; the addition amount of the carbon fiber powder is 20-24%;

s2, adding the tin-based Babbitt metal powder, the metal cobalt Co powder, the tungsten carbide WC powder and the carbon fiber powder into a mixer to mix, and fully mixing the tin-based Babbitt metal powder, the metal cobalt Co powder, the tungsten carbide WC powder and the carbon fiber powder for 6-8 hours to obtain spraying powder;

s3, adding the mixed spraying powder into plasma spraying equipment, and uniformly spraying the spraying powder on the surface of H62 brass by using the plasma spraying equipment;

s4, selecting a specific component from the sprayed H62 brass by adopting a metallographic specimen embedding machine and preparing an embedding specimen; sequentially grinding, polishing and corroding the end face of the embedded sample by using abrasive paper;

s5, measuring the microhardness HV of the test piece by using a manual turret microhardness instrument; and observing the microstructure of each test piece by an XRD diffractometer and a scanning electron microscope, analyzing the components of the coating and recording related parameters.

2. The method for preparing the tin-based babbitt metal coating containing high carbon fiber according to claim 1, wherein in S1, the addition amount of metallic cobalt Co powder is 8%; the addition amount of the tungsten carbide WC powder is 4 percent; the addition amount of the carbon fiber powder was 21%.

3. The method for preparing the tin-based babbitt metal coating containing high carbon fiber according to claim 1, wherein in S1, the addition amount of metallic cobalt Co powder is 10%; the addition amount of the tungsten carbide WC powder is 4 percent; the addition amount of the carbon fiber powder was 21%.

4. The method for preparing the tin-based babbitt metal coating containing high carbon fiber according to claim 1, wherein in S1, the addition amount of metallic cobalt Co powder is 8%; the addition amount of the tungsten carbide WC powder is 8 percent; the addition amount of the carbon fiber powder was 23%.

5. The method for preparing the tin-based babbitt metal coating containing high carbon fiber according to claim 1, wherein in S1, the addition amount of metallic cobalt Co powder is 20%; the addition amount of the tungsten carbide WC powder is 8 percent; the addition amount of the carbon fiber powder was 21%.

6. The method of claim 1, wherein the plasma spraying apparatus is PK-80Z-II, and the main gas of the plasma spraying apparatus is argon gas, in S3; the secondary gas is nitrogen.

7. The method of claim 1, wherein in step S4, an abrasion tester of MDW-02 type is used, the test load is 3N, the frequency is 3Hz, the abrasion time is 10min, and the abrasion lubricant is hippocampal multi-stage engine oil 5w-20 #.

8. The method for preparing the tin-based babbitt metal coating containing high carbon fiber according to claim 1, wherein in S4, oil lubrication is adopted during abrasion, 20# engine oil is uniformly coated on the surface of the spraying layer by using a sterile cotton swab, the test piece is weighed once every 20min, oil stain remained on the test piece is removed by using a degreasing agent or acetone after abrasion, ultrasonic vibration cleaning is carried out for 15-30min by using absolute ethyl alcohol, drying is carried out by using a blower, and weighing is carried out on an FB-C precision balance.

9. The method of claim 1, wherein the model number of the manual turret microhardness instrument is HV-1000, the model number of the X-ray diffractometer is Rigaku, and the model number of the scanning electron microscope is S-4800.

Technical Field

The invention relates to the technical field of bearing bush wear resistance of sliding bearings, in particular to a preparation method of a tin-based babbitt metal coating containing high carbon fibers.

Background

The bearing alloy commonly used for bearing alloy comprises tin-based alloy, lead-based alloy, copper-based alloy, aluminum-based alloy, iron-based alloy and the like, wherein the tin-based alloy and the lead-based alloy are low-melting-point bearing alloys, also called babbitt alloy, and the components of the babbitt alloy are Sn 82-84%, Sb 11-12% and Cu 5-6%, and then a series of soft-base antifriction tin-based alloy and lead-based alloy are developed on the basis, and are babbitt alloys which are very widely applied and have good antifriction property. Tin-based babbitt alloys typically contain 5-8 wt% Cu and 4-6 wt% Sb, with the balance being Sn. The solidification structure is a soft matrix a phase (Sb is dissolved in Sn) distributed with a needle-shaped or star-shaped Cu6Sn5 phase (intermetallic compound) or a square SnSb intermetallic compound. Under the non-water-based lubricating condition, the tin-based babbitt alloy also has good corrosion resistance. The best-shown feature of tin-based babbitt is its short seizure resistance, which is not seen in other oil-impregnated plain bearings, even in the absence of oil lubrication. Just because the babbitt metal has better friction and wear resistance, the babbitt metal is widely applied to important industrial fields such as aerospace, automobile carrying, energy utilization and the like.

In an actual working environment, however, the working part of the tin-based babbitt alloy often fails to work to different degrees due to abnormal friction and wear, so that the bearing bush is easy to fall off, and loss is caused; therefore, the surface hardness and the wear resistance of the tin-based babbit alloy are improved, a tiny gap can be formed between sliding surfaces, an oil storage space and a lubricating oil channel are formed, friction reduction is facilitated, the friction performance of the bearing bush can be improved, and the problem that the bearing bush falls off can be effectively solved.

Disclosure of Invention

The invention aims to provide a preparation method of a tin-based babbitt metal coating containing high carbon fibers, which aims to solve the problems that the tin-based babbitt metal coating in the background art is not high in surface hardness and wear resistance, so that the babbitt metal working often fails to work to different degrees due to abnormal friction and wear, and a bearing bush is easy to fall off to cause loss.

In order to achieve the purpose, the invention provides the following technical scheme: a method for preparing a tin-based babbitt metal coating containing high carbon fibers comprises the following steps:

s1, adding metal cobalt Co powder, tungsten carbide WC powder and carbon fiber powder into the tin-based Babbitt metal powder, wherein the addition amount of the metal cobalt Co powder is 8-20%; the addition amount of the tungsten carbide WC powder is 4-10%; the addition amount of the carbon fiber powder is 20-24%;

s2, adding the tin-based Babbitt metal powder, the metal cobalt Co powder, the tungsten carbide WC powder and the carbon fiber powder into a mixer to mix, and fully mixing the tin-based Babbitt metal powder, the metal cobalt Co powder, the tungsten carbide WC powder and the carbon fiber powder for 6-8 hours to obtain spraying powder;

s3, adding the mixed spraying powder into plasma spraying equipment, and uniformly spraying the spraying powder on the surface of H62 brass by using the plasma spraying equipment;

s4, selecting a specific component from the sprayed H62 brass by adopting a metallographic specimen embedding machine and preparing an embedding specimen; sequentially grinding, polishing and corroding the sample-embedded end face by using abrasive paper;

s5, measuring the microhardness HV of the surface of the test piece by using a manual turret microhardness instrument; and observing the microstructure of each test piece by using an X-ray diffractometer and a scanning electron microscope, analyzing the components of the coating and recording related parameters.

Preferably, in S1, the addition amount of the metallic cobalt Co powder is 8%; the addition amount of the tungsten carbide WC powder is 4 percent; the amount of carbon fiber powder added was 21%.

Preferably, in S1, the addition amount of the metallic cobalt Co powder is 10%; the addition amount of the tungsten carbide WC powder is 4 percent; the addition amount of the carbon fiber powder was 21%.

Preferably, in S1, the addition amount of the metallic cobalt Co powder is 8%; the addition amount of the tungsten carbide WC powder is 8 percent; the addition amount of the carbon fiber powder was 23%.

Preferably, in S1, the addition amount of the metallic cobalt Co powder is 20%; the addition amount of the tungsten carbide WC powder is 8 percent; the addition amount of the carbon fiber powder was 21%.

Preferably, in S3, the model of the plasma spraying equipment is PK-80Z-II, and the main gas of the plasma spraying equipment is inert gas argon; the secondary gas is nitrogen.

Preferably, in S4, when in abrasion, an abrasion tester with the model of MDW-02 is adopted, the test loading force is 3N, the frequency is 3Hz, the abrasion time is 10min, and the abrasion lubricating oil is the hippocampus multi-stage engine oil 5 w-20.

Preferably, in S4, oil lubrication is adopted during abrasion, 20# engine oil is uniformly coated on the surface of the spraying layer by using a sterile cotton swab, the test piece is weighed once every 20min, oil removal agents or acetone are used for removing residual oil stains on the test piece after abrasion, absolute ethyl alcohol is used for ultrasonic vibration cleaning for 15-30min and then is dried by a blower, and the test piece is weighed on an FB-C precision balance.

Preferably, in S5, the model of the manual turret microhardness instrument is HV-1000, the model of the X-ray diffractometer is Rigaku, and the model of the scanning electron microscope is S-4800.

The invention provides a preparation method of a tin-based babbitt metal coating containing high carbon fibers, which has the following beneficial effects:

according to the invention, metal cobalt Co powder, tungsten carbide WC powder and carbon fiber powder are added into tin-based babbitt metal powder, mixed and sprayed on the surface of H62 brass by using plasma spraying equipment, then the sprayed H62 brass is subjected to an abrasion test, and the tested coating is analyzed by using a microhardness tester and a diffractometer and an electron microscope, and the test result shows that: in the mixed tin-based babbitt alloy, when the content of cobalt (Co) is minimum and the content of tungsten carbide (WC) is minimum, the wear rate is minimum and is 0.0027g/min, and the wear rate is reduced by about 5.6 times; the surface microhardness 363.03HV of the tin-based babbit alloy sprayed and mixed with the metallic cobalt Co powder, the tungsten carbide WC powder and the carbon fiber powder C24 can reach 430.5HV to the maximum extent, and is increased by 5.03 times compared with the microhardness of the single tin-based babbit alloy, so that the surface hardness of the mixed tin-based babbit alloy coating is effectively increased, and the bearing can run for a long time under a large load.

Drawings

FIG. 1 Friction curve of brass plasma sprayed tin-based babbitt alloy containing high carbon fiber C24Co14WC8

FIG. 2 SEM image of cross-section of brass plasma sprayed coating containing high carbon fiber (C24) tin-based babbitt;

fig. 3 an energy spectrum analysis image of brass plasma sprayed with 20% cobalt containing high carbon fiber (C24) tin-based babbitt.

FIG. 4 is a diffraction pattern of a tin-based babbitt alloy of the present invention containing high carbon fiber C24Co14WC8 by plasma spraying.

Detailed Description