| ZHOU Zhi-qiang,HAO Jiao-shan,SONG Wen-wen,SUN De-en,LI Li,JIANG Yong-bing,ZHANG Jian.High Temperature Tribological and Wear Properties of Plasma Sprayed Al2O3-40%TiO2 Ceramic Coating on Titanium Alloy[J],52(12):351-359, 368 |
| High Temperature Tribological and Wear Properties of Plasma Sprayed Al2O3-40%TiO2 Ceramic Coating on Titanium Alloy |
| Received:October 17, 2022 Revised:May 17, 2023 |
| View Full Text View/Add Comment Download reader |
| DOI：10.16490/j.cnki.issn.1001-3660.2023.12.029 |
| KeyWord:titanium alloy surface plasma spraying Al2O3-40%TiO2 coating high temperature friction and wear |
| Author | Institution |
| ZHOU Zhi-qiang |
Chongqing Chuanyi Control Valve Co., Ltd., Chongqing , China |
| HAO Jiao-shan |
Chongqing Chuanyi Control Valve Co., Ltd., Chongqing , China |
| SONG Wen-wen |
Chongqing Chuanyi Control Valve Co., Ltd., Chongqing , China |
| SUN De-en |
School of Materials and Energy, Southwest University, Chongqing , China |
| LI Li |
Chongqing Chuanyi Control Valve Co., Ltd., Chongqing , China |
| JIANG Yong-bing |
Chongqing Chuanyi Control Valve Co., Ltd., Chongqing , China |
| ZHANG Jian |
Chongqing Chuanyi Control Valve Co., Ltd., Chongqing , China |
|
| Hits: |
| Download times: |
| Abstract: |
| Atmospheric plasma spraying (APS) is an advanced surface modification technology, which can improve surface properties of titanium alloy without changing the substrate material, such as wear resistance, corrosion resistance, oxidation resistance and other properties. Many researchers have studied the abrasion resistance and corrosion resistance of Al2O3-13%TiO2 coating prepared by APS on titanium alloy at room temperature. However, temperature has an important effect on the performance of oxide ceramic coatings and related researches are rarely reported. The work aims to study the effect of temperature on the friction and wear properties of Al2O3-40%TiO2 (AT40) ceramic coating and explore the friction and wear mechanism of the coating at high temperature. Commercially available HasC-276(NiMo16Cr15Fe6W4, wt.%) powders and Al2O3-40%TiO2 (wt.%) with a nominal particle size distribution of –45-+15 μm and –35-+5 μm were prepared as spray powder, respectively. Plain TC4 (Ti-6Al-4V, wt.%) titanium alloy plates (30 mm×15 mm×8 mm) were used as substrate materials. Prior to APS spraying, the substrates were sand blasted with corundum grit (50~70 mesh) in order to improve the bonding strength between coating and substrate. The coatings were deposited by atmospheric spraying equipment (PRAXAIR 3710M, America) manipulated with a robot (ABB, Sweden). The plasma deposition process was carried out with optimal process parameters. The HasC-276 layer acted as bonder coating in order to reduce the difference in mechanical properties between TC4 substrate and ceramic coating, which reduced the crack sensitivity and improved the adhesion. The spray thickness of HasC-276 layer and AT40 coating was about 100 µm and 250-300 µm, respectively. AT40 coating samples were cut with wire cutting and the cross section and surface were polished to a smooth surface with Ra of (0.15±0.02) μm. The friction and wear properties of AT40 ceramic coating were tested on a multi-function friction wear tester (MFT-5000, China) at 200 ℃, 350 ℃and 500 ℃ and as well as the in-situ online automatic 3D morphology characterization. Scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) were used to qualitatively analyze the micro morphology and phase of AT40 ceramic coating. The section micro-hardness distribution of AT40 ceramic coating at room temperature and at high temperature was studied with the Vickers micro-hardness tester. The results show that the AT40 ceramic coating presents a typical thermal spraying layered structure, with uniform distribution of all phases and dense coating structure. The average micro-hardness is 81% higher than that of the TC4 titanium alloy substrate. The high temperature hardness of AT40 ceramic coating at 200, 350 and 500 ℃ is 513, 463 and 448HV0.3 respectively. At 200 ℃ and 350 ℃, the average friction coefficient of AT40 ceramic coating is 0.18±0.02 and 0.38±0.03 respectively, and the wear rate is (7.8±0.01)×10–5 mm3/(N.m) and (37.2±0.01)×10–5 mm3/(N.m) respectively and the coating shows excellent high temperature friction and wear resistance. At 500 ℃, the average friction coefficient and wear rate of the coating are 0.77±0.02 and (134.4±0.01)×10–5mm3/(N.m) respectively, the wear scar depth and wear volume increase significantly, and the wear resistance decreases. A few small holes and micro-cracks are observed on the surface morphology of AT40 as-sprayed coating, which acts as initial-cracking. During the high temperature wear process, the surface of AT40 coating under the action of friction and compressive stress will generate high local stress, which will cause these initial micro-crack to grow and expand along the oxide structure boundary and the holes of the coating and generate longitudinal through cracks, forming micro brittle fracture. The wear mechanism of AT40 ceramic coating is mainly micro brittle fracture at 200 ℃ and 350 ℃. Moreover, with the temperature increasing to 500 ℃, the thermal stress inside the coating is the major factor that promotes the crack propagation. It causes the coating to delaminate and peel off, forming peeling pits and wear debris. These peeled particles remain on the surface of the sample and will be crushed to fine debris. These pulled out debris will act as abrasive particles leading to the three-body abrasive wear. Many wear grooves, micro-cracking, wear debris and pores are obviously observed on the worn surface of the AT40 coating at 500 ℃ indicating that delamination and peeling caused by crack propagation and slight abrasive wear are the main wear mechanism. |
| Close |
|
|
|