To enhance its tribo-mechanical properties, researchers have developed ternary/nanocomposite coatings by introducing a third element to the Si 3 N 4 binary coatings. These coatings offer improved properties, that can be fine-tuned by controlling their microstructure and composition.

2024年6月15日 · A Si 3 N 4 /AO20 coating was developed for C/C oxidation protection. The multilayer coating was dense, defect-free and bonding well. AO20/Si 3 N 4 composite coating samples prepared using Si 3 N 4 as an inner coating instead of SiC have good oxidation and thermal shock resistance properties. It showed excellent thermal shock resistance at ...

2021年9月15日 · A dense β-Si 3 N 4 coating toughened by β-Si 3 N 4 nanowires/nanobelts was prepared by a combined technique involving chemical vapor deposition and reactive melt infiltration to protect porous Si 3 N 4 ceramics in this work.

NTST has recently developed the unique capability to fabricate silicon nitride (Si3N4) coatings. Si3N4 is extremely difficult to fabricate as a coating due to its tendency to sublime at high temperature. It is a high-melting point solid that is relatively chemically inert and very hard (8.5 on the Mohs scale).

2025年2月1日 · To address the issues of low curing depth and high viscosity in VPP slurries caused by the high refractive index and hydrophilic surface of silicon nitride (Si 3 N 4), this study proposes a novel surface modification method. The process starts with the pre-coating of Si 3 N 4 powder using the silane coupling agent KH570.

2021年5月4日 · More importantly, during the LTCVD process, SiO x coatings and nanowire arrays were in situ formed via vapor–solid (VS) and vapor–liquid–solid (VLS) mechanisms on the surface and intersection of Si 3 N 4 nanofibers, which cemented the aerogel framework, endowed it with hydrophobicity, and improved its oxidation resistance at high temperature.

2023年8月16日 · In the present study, the deposition of silicon nitride (Si 3 N 4) coating on Inconel 738 through plasma spray has been investigated. For producing the Si 3 N 4 coating, different times (6, 8 and 10 s), different distances of the plasma spray torch from the substrate (30, 35 and 40 mm) and different currents for plasma spraying (3000, 3250 and ...

2024年7月12日 · Metal-coated Si3N4 ceramic substrates exhibit exceptional reliability, rendering them highly promising candidates for implementation in high-power electronics. To create Ag/Ni coated Si3N4 substrate, Ni coating with a porous structure was generated on the substrate using screen printing in conjunction with a high-temperature sintering technique.

2021年8月23日 · Silicon nitride (Si3N4) coating was deposited on AISI D2 tool steel through employing duplex surface treatments—pack siliconizing followed by plasma nitriding. Pack cementation was performed at 650 °C, 800 °C, and 950 °C for 2 and 3 hours by using various mixtures to realize the silicon coating.

2024年6月15日 · The C/Si 3 N 4 composite film was prepared by circulating 16% sucrose solution on the coating machine for 4 times and heat treating with nitrogen at 850 °C for 60min. The composite film has excellent electrical conductivity, and the resistivity is 15 mΩ cm at normal temperature (20 °C), and the minimum resistivity can be less than 1 mΩ cm ...