4results about How to "Wide condition" patented technology

The invention relates to a preparation method and application of a composite catalyst for catalyzing toluene oxidation. The method comprises the following steps: step 1, dissolving K2FeO4 in water, adding a manganese salt compound, and stirring evenly to obtain a solid-liquid mixture 1; step 2, transferring the solid-liquid mixture 1 obtained in step 1 to a closed container and performing a heating treatment; step 3, filtering the product after the heating treatment in step 2, and washing (repeatedly washing with deionized water or ethanol) to obtain a Mn3O4-Fe2O3 solid; step 4, drying the Mn3O4-Fe2O3 primary solid obtained in step 3 to obtain a Mn3O4-Fe2O3 solid; and step 5, calcining the Mn3O4-Fe2O3 solid obtained in step 4 to obtain the Mn3O4-Fe2O3 catalyst.

The invention discloses a residual life prediction method applied to a hot end component of an aero-engine, which comprises the following steps of: performing finite element analysis on the hot end component of the aero-engine with cracks, and determining J integral and stress three-axis degree of a crack front edge node under different loads; the representative position of the crack front edge is determined by combining the J integral of the crack front edge and the stress three-axis degree processing result; generating a traditional failure assessment diagram through the J integral of the representative position of the crack front edge; a correlation function of crack driving force and ligament yield parameters under different crack sizes is constructed, and a failure assessment diagram and a damage tolerance failure assessment diagram combined with the crack size effect are generated; and performing allowable crack size and residual fatigue life prediction to obtain a fatigue life prediction result. According to the method, the residual life prediction precision and reliability of the aero-engine hot end component are improved, the service cycle and maintenance strategy of equipment are optimized, and potential safety hazards caused by structural failure are reduced.

This invention discloses a functionalized MXene-supported metal oxide catalytic material, its preparation method, and its applications. The preparation method includes: fully contacting a pretreated metal substrate with a liquid-phase system containing MXene and metal ions and reacting at high temperature, followed by annealing in air to obtain the MXene-supported metal oxide material; and then subjecting it to electrochemical or chemical treatment to obtain the functionalized MXene-supported metal oxide catalytic material. In the functionalized MXene-supported metal oxide catalytic material of this invention, electron transfer occurs between the functionalized MXene and the metal oxide, promoting the formation of more active sites in the metal oxide that are conducive to catalyst-reactant electron exchange, thereby improving the activity of the oxygen evolution reaction (OER). Simultaneously, the functionalized MXene has abundant surface groups, which can generate strong chemical interactions with the metal oxide, improving the stability of the metal oxide in acidic media.

The invention relates to the technical field of flexible sensor preparation, and discloses a preparation method and application of a ZIF-8-based flexible pressure sensor with a wide linear range. According to the flexible sensor provided by the invention, a sensing solution with high sensitivity and a wide linear range is realized through an innovative design of growing a metal organic framework (MOF) compound. The preparation method comprises the following steps: immersing the cotton fabric in a carbon nanotube dispersion liquid to obtain a carbon nanotube conductive fabric, and immersing the obtained conductive fabric in a ZIF-8 growth solution to obtain the flexible pressure sensor based on ZIF-8. The sensor has the advantages of high sensitivity, wide linear range, quick response and good stability and repeatability, can be applied to the fields of gesture recognition and intelligent control, intelligent health monitoring, environment monitoring and the like, and has a wide application prospect.