Preparation method of alumina fiber reinforced alumina ceramic-based composite material containing low-modulus interface

The invention relates to a preparation method of an alumina fiber reinforced alumina ceramic-based composite material containing a low-modulus interface. The method comprises the following steps: pretreating an alumina fiber preform, and removing an impregnating compound; preparing lanthanum phosphate interface slurry; sequentially carrying out vacuum impregnation and pressure impregnation on the alumina fiber preform in the lanthanum phosphate interface slurry, and then drying and sintering; preparing matrix sol; and sequentially carrying out vacuum impregnation and pressure impregnation on the sintered alumina fiber preform in the matrix sol, and then drying and sintering to obtain the interface-containing alumina fiber reinforced alumina ceramic matrix composite material. The lanthanum phosphate coating can be effectively coated on the fiber surface, the vacuum impregnation process and the pressure impregnation process are carried out separately, it is guaranteed that interface slurry ...

Electrochemical processing method for micro-structure of P type silicon surface

Device and method capable of measuring surface pH of photoelectrode in real time

The invention discloses a device and method capable of measuring the pH value of the surface of a photoelectrode in real time, and belongs to the technical field of photoelectrochemistry. According to the device disclosed by the invention, the illumination intensity, time and pH are linked together by utilizing the real-time pH-sensitive fluorescent probe, so that the real-time measurement of the pH value on the surface of the photoelectrode is realized, the visual research on the photoelectrocatalytic activity is further realized, the activity of the photoelectrode and the spatial distribution of active sites are disclosed, and the photocatalytic performance can be better evaluated. The method and the device can be used for measuring the pH distribution of the surface of the electrode in the photoelectrochemical water decomposition process in real time, and can be applied to research in the fields of solar hydrogen production and the like.

Method for rapidly preparing alumina fiber reinforced alumina ceramic-based composite material at low cost

The invention relates to a method for rapidly preparing an alumina fiber reinforced alumina ceramic-based composite material at low cost. The method comprises the following steps: pretreating an alumina fiber preform, and removing an impregnating compound; preparing lanthanum phosphate interface slurry; carrying out vacuum impregnation on the pretreated alumina fiber preform in the lanthanum phosphate interface slurry, and then drying and sintering to obtain a preform containing a lanthanum phosphate interface layer; preparing aluminum oxide slurry; carrying out vacuum impregnation on the preform containing the lanthanum phosphate interface layer in aluminum oxide slurry, and then drying to obtain a flaky prepreg; performing tape casting on the aluminum oxide slurry to prepare an aluminum oxide raw sheet; and alternately laying the alumina raw material sheets and the sheet prepreg in a mold, and sintering to obtain the alumina fiber reinforced alumina ceramic-based composite material. The ...

Electrochemical processing method for micro-structure of P type silicon surface

The invention provides an electro-chemical processing method of a P-typed silicon surface micro-structure, relating to the processing of silicon surface. The invention provides a novel electro-chemical processing method which has low cost and simple processing steps, does not have complex processes such as mask lithography, etc., and with micro-structure etched and is processed on the surface of the P-typed silicon in one-step. The electro-chemical processing method comprises the steps that: the micro-structure on an original mother blank is transferred onto a gelose surface and then dipped in electrolyte, so as to gain the gelose gel template with the stored electrolyte; the gelose gel template is then arranged in an electrolytic cell, the micro-structure part of which is exposed on the liquid surface; a Pt layer is splashed on the back surface by the P-typed silicon through a front disposal to form an ohm contact; a polished surface is then arranged on the surface of the gelose gel template ...

Method for preparing GaAs micro/nono optical element

Device and method for measuring hole concentration on surface of photoelectrode

The invention discloses a photoelectrode surface hole concentration measuring device and method. The photoelectrode surface hole concentration measuring device comprises an electrolytic tank, a first light source, a second light source, an optical element, a silicon diode detector, a data acquisition device, an electrochemical workstation and a computer, according to the invention, the photoelectrode in the electrolytic tank is periodically irradiated by two beams of light with different periods and different wavelengths, so that the concentration of photogenerated holes on the surface of the electrode and the quantitative relation between the concentration and photocurrent are detected in situ. The method can be applied to research on an electrode interface reaction kinetics process in a photoelectrochemical system so as to more scientifically guide preparation of the photoelectrode.

Method for preparing GaAs micro/nono optical element

The invention relates to a method for preparing a micron/nanometer optical element on GaAs and a micron/nanometer optical element thereof, in particular to a preparation method in which the micron/nanometer optical array element is directly etched on the surface of semiconductor GaAs material at one time with low cost, simple method and no complex processes such as mask lithography and so on. The quartz with the micron/nanometer optical array element is taken as an original mother blank; a relief structure on the quartz micron/nanometer optical array element is accurately replicated on the surface of polymer material and then a Ti layer and a Pt layer are sputtered in sequence; the surface is then metallized to obtain a template electrode. The template electrode is used as a working electrode and is adjusted to be parallel to a processed workpiece GaAs; an electrochemical etching solution is added into an electrolytic cell and an etching agent is generated on the template electrode; a restraint ...

Cover plate device and using method thereof

The invention relates to the technical field of electric power equipment, in particular to a cover plate device and a using method thereof.The cover plate device blocks an opening in the upper end of a pipe shaft and comprises a mounting part, an inflation rubber gasket and a negative pressure mechanism, and the mounting part is provided with a containing space; the inflatable rubber gasket is arranged on the peripheral side of the mounting part, the outer side face of the inflatable rubber gasket can abut against the inner wall of the piping shaft, the negative pressure mechanism is arranged in the containing space of the mounting part, the negative pressure mechanism is communicated with the piping shaft through a first air guide pipe, and the negative pressure mechanism is communicated with the inflatable rubber gasket and the outside atmosphere through a second air guide pipe. Through the arrangement, a closed, negative-pressure and low-oxygen environment is formed in the piping shaft ...

Alumina fiber reinforced ceramic matrix composite material containing lanthanum phosphate interface layer and preparation method of alumina fiber reinforced ceramic matrix composite material

The invention relates to an alumina fiber reinforced ceramic matrix composite material containing a lanthanum phosphate interface layer and a preparation method of the alumina fiber reinforced ceramic matrix composite material. The method comprises the following steps: impregnating an impregnating compound removed alumina fiber three-dimensional fabric in a lanthanum phosphate precursor solution, and sintering at high temperature to obtain an alumina fiber three-dimensional fabric containing a lanthanum phosphate interface layer; preparing aluminum oxide slurry; dipping the alumina fiber three-dimensional fabric in alumina slurry in vacuum, and then uniformly gelling; carrying out high-temperature sintering on the alumina fiber reinforced alumina-based composite material blank to obtain a sintered rough blank; the sintered rough blank is subjected to vacuum impregnation with alumina sol; performing vacuum impregnation on the alumina fiber three-dimensional fabric impregnated with the alumina ...