4results about How to "Control microstructure" patented technology

The invention discloses an efficient anti-wear and anti-friction additive and a preparation method thereof, and relates to the technical field of lubricating materials. The additive comprises at least one metal composite compound, and metal elements in the metal composite compound comprise one or a combination of at least two of Ni, Cu, Zn, Ti or Ce; by controlling the mass ratio of each element, the synergistic interaction is realized; the preparation method comprises the following steps: mixing a metal composite compound, then carrying out ball milling treatment, and then carrying out calcination and surface modification to prepare the additive, the additive provided by the invention can form a high-strength protective film on a friction interface through the synergistic effect of a specific metal composite compound, so that the anti-wear and anti-friction performance and high-temperature stability of the lubricating oil are remarkably improved.

The application discloses a preparation method of a monopropellant monolithic catalyst, selects a honeycomb ceramic carrier which has good heat conductivity and heat shock resistance and can keep stable structure in a high-temperature environment, coats a modified alumina coating on the surface of the ceramic carrier, and then loads noble metal as a catalytic active component through an impregnation method, so that the connectivity between the noble metal active component and the carrier is enhanced, the noble metal loading capacity is increased, the coating firmness is improved, the catalyst breakage rate is significantly reduced, and the catalyst thermal stability is improved. The monolithic catalyst prepared by the application has high catalytic activity, good coating firmness, and the modified alumina coating can also increase the strength of the carrier, can effectively inhibit sintering and phase change of the carrier in a high-temperature environment, improve the thermal stability, and is not easy to break in a high-temperature environment.

This invention relates to the field of perovskite solar cell technology, specifically disclosing an additive for regulating nanoclusters within perovskite grains and its application. The additive comprises electron-deficient quaternary ammonium groups and negatively charged sulfonic acid groups. The additive of this invention contains electron-deficient quaternary ammonium groups and negatively charged sulfonic acid groups, which coordinate with the coordinating cations and halide anions of the perovskite precursor. This coordination interaction controls the crystallization process and passivates grain boundaries, inhibiting the formation of nanoclusters within the grains. This achieves the chemical elimination of nanoclusters within the perovskite grains and suppresses non-radiative recombination, thereby regulating the microstructure of the perovskite thin film grains.

This invention discloses a flexible multifunctional composite film integrating heat dissipation and flame retardancy, its preparation method, and its application, belonging to the technical field of multifunctional composite film materials. The composite film is composed of MXene, graphene oxide (GO), and carbon nanotubes (CNTs) in a specific mass ratio, prepared by magnetic stirring, ultrasonic dispersion in a cold water bath, pulsed / gradient negative pressure vacuum filtration, and freeze-drying. The film thickness is 20-30 μm. In the layered structure of the film, GO sheets are inserted between MXene layers, and CNTs bridge the layers to form a three-dimensional thermally conductive network, achieving high in-plane thermal conductivity (≥4 W·m). ‑1 ·K ‑1 It also possesses excellent flame retardancy (limiting oxygen index LOI ≥ 28%, UL-94V-0 rated) and excellent mechanical flexibility. This film can be used as an integrated heat dissipation-flame retardant interface layer in high-power density electronic devices, electric vehicles, and other fields to address risks such as thermal runaway and fire.