| CHEN Dong,LU Jing,SUN Cheng-chuan,WU Ying-dong,LI Ting.Preparation and Properties of Plasma-sprayed FeCrBC-NiAl-TiB2 Composite Coating[J],52(9):459-468 |
| Preparation and Properties of Plasma-sprayed FeCrBC-NiAl-TiB2 Composite Coating |
| Received:August 16, 2022 Revised:November 10, 2022 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2023.09.042 |
| KeyWord:atmosphere plasma spray composite coating microstructure coating properties |
| Author | Institution |
| CHEN Dong |
Jihua Laboratory, Guangdong Foshan , China |
| LU Jing |
Jihua Laboratory, Guangdong Foshan , China |
| SUN Cheng-chuan |
Jihua Laboratory, Guangdong Foshan , China |
| WU Ying-dong |
Jihua Laboratory, Guangdong Foshan , China |
| LI Ting |
Jihua Laboratory, Guangdong Foshan , China |
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| Abstract: |
| Composite coatings can effectively improve the strength, fracture toughness, wear resistance, and other properties of traditional single material coatings, which becomes one of the research hotspots in recent years. Due to high hardness, low density (4.5 g/cm3), and good oxidation resistance, TiB2-metal composite coating is believed to be one of the more potential candidates for improving the surface wear resistance of key components. In this paper, the microstructure, phase structure, and bonding strength of plasma-sprayed FeCrBC-NiAl-TiB2 composite coatings were characterized. The abrasion resistance of FeCrBC and FeCrBC-NiAl-TiB2 composite coatings was also studied systematically. Raw materials TiB2 (10wt.%), NiAl (10wt.%), and FeCrBC (80wt.%) powder were mixed in a three-dimensional mixer for 60 min in proportion to prepare the FeCrBC-NiAl-TiB2 composite powder. The 304 stainless steel (30 mm×10 mm×3 mm and φ25.4 mm×10 mm) was selected as the substrate. Before sandblasting, the samples were cleaned with acetone to remove the surface oil. An atmospheric plasma spraying system (BSX-80, Xiamen Baisunxing Automation Co., LTD.) was used to deposit the FeCrBC and FeCrBC-NiAl-TiB2 composite coating. The phase of powder and coating was determined by an X-ray diffractometer (XRD, CuKα, D8 Advanced, Bruker). The microhardness of the coating was measured with a Vickers hardness tester (Laizhou Huayin, HVS-1000). The bonding strength of the coating was determined with an electronic universal testing machine (WJinan Liantai, DW-100Y). The morphology of the coating was observed with a scanning electron microscope (JSM-6390LA) and an energy-dispersive X-ray spectroscopy (EDX, INCA X-MAX). The wear resistance of samples was tested with a pin-disc friction and wear testing machine (Zhongke Kaihua, SFT-2M). Before the test, the surface of the samples was polished with SiC sandpaper to keep a similar roughness (Ra 0.2-0.5 μm). A displacement sensor probe was applied for the morphology of the grinding of the samples. The wear rate was calculated and the morphology after the friction surface was observed. The surfaces of FeCrBC and FeCrBC-NiAl-TiB2 composite coatings were both composed of dense and smooth areas and loose molten particles. Because the melting point of TiB2 particles was higher than the metal phase, the spreading deformation after particle impact was smaller, hence the surface roughness of the composite coating increased. Both FeCrBC and FeCrBC-NiAl-TiB2 composite coatings were closely bonded to the substrate, and there was no obvious crack at the interface. The bonding strength of FeCrBC and FeCrBC-NiAl-TiB2 composite coatings was 69.5 MPa and 69.1 MPa respectively. TiB2 in the composite coating had good wettability with the FeCrBC phase and NiAl phase. The microhardness of FeCrBC coating and FeCrBC-NiAl-TiB2 composite coating were equivalent, which were 823.3HV0.1 and 810.8HV0.1 respectively. The wear volume and wear rate of the FeCrBC-NiAl-TiB2 composite coating were 0.11 mm3 and 0.65×10–5 mm3/(N.m), respectively. Compared with the FeCrBC coating, the wear rate of the FeCrBC-NiAl-TiB2 composite coating was reduced by 38.1%, which exhibited good wear resistance. The wear mechanism of FeCrBC-NiAl-TiB2 composite coating was mainly abrasive wear and fatigue wear. Because of the uniform distribution of hard phases such as TiB2, (Fe, Cr)2(B, C), and (Fe, Cr)3(B, C) on the surface of the coating, the wear resistance of the FeCrBC-NiAl-TiB2 composite coating is significantly improved. The FeCrBC- NiAl-TiB2 composite coating can effectively improve the wear resistance of the substrate and has a good application prospect. |
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