31 results about "Pulse laser irradiation" patented technology

The invention provides a molybdate-containing acid radical solution preparation method, and belongs to the field of preparation and applications of nano-materials. The method includes the steps: providing molybdate-containing acid radical suspension; irradiating the molybdate-containing acid radical suspension by an ultraviolet pulse laser under a stirring condition to obtain molybdate-containingacid radical solution. A molybdate-containing acid radical is derived from molybdic acid and cobalt molybdate or nickel molybdate, the irradiation wave length of the ultraviolet pulse laser is 355nm,pulse width is 5-17ns, and pulse frequency is (0, 20) Hz. By the aid of a liquid-phase ultraviolet pulse laser irradiation technique, mass, pure and soluble molybdic acid, cobalt molybdate and nickelmolybdate solution can be synthesized in a one-step manner. Compared with similar materials on the market, the prepared molybdate-containing acid radical solution has water solubility, does not have impurities and can serve as a molybdenum source to be used and can be prepared into multifunctional molybdenum-based nano-materials such as molybdenum oxide, nickel molybdate and cobalt molybdate nano-materials through after-treatment such as spraying, printing and heat treatment.

The invention discloses a method and device for forming a metal reducer pipe based on a laser shock wave technology and belongs to the technical field of laser processing. In the invention, the upper end part, separated from a pipe fitting, of a plugging rod is coated with a laser energy absorption layer; a laser beam enters the interior of a pipe billet to be formed along the axis of the pipe billet, thereby irradiating on the absorption layer on the upper end part of the plugging rod; the absorption layer absorbs laser energy so as to be gasified and ionized, thus forming high-voltage plasmas; and the high-voltage plasmas quickly expand to form a high-amplitude shock wave, thereby promoting the expansion of the pipe billet until the pipe billet is jointed with the profile of a mould, therefore the deformed shape of the pipe billet is in accordance with the profile of the mould. In the invention, the laser shock wave controlled in parameter is utilized as a power source for internal high pressure forming of the pipe billet, and good safety is provided; and the method and device provided by the invention are suitable for not only forming the pipe billet of a material extremely low in yield limit, but also forming the pipe billet with high yield strength; besides, continuous multi-pulse laser irradiation can be performed and uninterrupted multi-impact can be carried out; and high production efficiency is ensured.