3results about How to "Avoid excessive erosion" patented technology

This disclosure relates to the photovoltaic field, providing a photovoltaic cell and its manufacturing method, as well as a photovoltaic module. The manufacturing method of the photovoltaic cell includes: placing a substrate in a support structure, at least one surface of the substrate including a plurality of mutually spaced first regions, the first regions being located at the edges of the surface; forming a semiconductor layer on the surface; performing a diffusion process on the semiconductor layer to convert the semiconductor layer into a doped layer, and forming a protective layer on the side of the doped layer away from the substrate; wherein, in the step of forming the semiconductor layer, nitrogen gas and silane are introduced into a reaction chamber used to prepare the semiconductor layer, and the ratio of the nitrogen gas flow rate to the silane gas flow rate is controlled to be 0.7~1; and / or, the diffusion process includes sequentially performed oxygen-free annealing and oxygen-containing annealing, the ratio of the oxygen-containing annealing duration to the oxygen-free annealing duration being greater than 1. This disclosure at least helps to avoid excessive erosion of the doped layer located on the first region.

This invention belongs to the field of copper composite material preparation technology, specifically relating to a method for preparing single-walled carbon nanotube-copper composite materials. Single-walled carbon nanotubes are prepared using a flotation catalytic method, followed by acid washing and high-temperature repair purification. Subsequently, the single-walled carbon nanotubes are subjected to mixed acid gradient oxidation, and cobalt nanoparticles are chemically deposited onto their surface. Then, an amorphous titanium dioxide coating is composited onto the modified single-walled carbon nanotubes using a sol-gel method. The composite powder is added to molten copper and mixed uniformly under ultrasonic and magnetic field-assisted stirring. Finally, the mixture is rapidly solidified and hot-drawn into copper rods using a hot-casting method under continuous magnetic field assistance to obtain the single-walled carbon nanotube-copper composite material. This method improves the dispersion and interfacial bonding strength of single-walled carbon nanotubes in the copper matrix and enables the single-walled carbon nanotubes to oriented within the copper matrix. The method is simple, and the prepared composite material exhibits excellent electrical, thermal, and mechanical properties.

The invention provides an aggressive agent for titanium-palladium alloy metallographic erosion. The aggressive agent comprises the following components: glycerol, methanol, benzenesulfonic acid, oxalic acid and deionized water. By using the etchant disclosed by the invention, the corrosion of the metallographic structure of the titanium-palladium alloy can be easily controlled, the process is safer, and the metallographic structure which is easy to observe can be more easily obtained; the preparation and erosion processes of the erosion agent are simple and convenient to operate.