111results about How to "Good surface morphology" patented technology

During the growth of a nitride semiconductor crystal on a nonpolar face nitride substrate, such as an m-face, the gas that constitutes the main flow in the process of heating up to a relatively high temperature range, before growth of the nitride semiconductor layer, (the atmosphere to which the main nitride face of the substrate is exposed) and the gas that constitutes the main flow until growth of first and second nitride semiconductor layers is completed (the atmosphere to which the main nitride face of the substrate is exposed) are primarily those that will not have an etching effect on the nitride, while no Si source is supplied at the beginning of growth of the nitride semiconductor layer. Therefore, nitrogen atoms are not desorbed from near the nitride surface of the epitaxial substrate, thus suppressing the introduction of defects into the epitaxial film. This also makes epitaxial growth possible with a surface morphology of excellent flatness.

The invention discloses a graphene/titanate nanometer composite visible-light activated photocatalyst and a preparation method thereof, and belongs to the fields of nanometer composite materials and photocatalysis technology. The composite photocatalyst is prepared by compounding titanate and graphene, and the preparation method comprises the following steps: reacting tetrabutyl titanate with ammonia water to obtain a titanium hydroxyl compound; performing ultrasonic dispersion of graphene oxide in water, adding nitrate, stirring, mixing with the titanium hydroxyl compound and a potassium hydroxide aqueous solution, stirring, finally transferring the mixed solution into a reaction vessel to perform a hydrothermal reaction, after the reaction, performing centrifugation, filtration, washing, and vacuum drying of the product to obtain the composite photocatalyst. Photocatalytic degradation experiments show that the graphene/titanate composite photocatalyst prepared by the method has good photocatalytic degradation effect on rhodamine B under visible light irradiation. The photocatalyst of the invention has the advantages of relatively simple operation process, controllable morphology, no requirements for other reducing agents, and good visible-light activated photocatalysis performance.

The invention discloses a thin film transistor and a manufacture method, an array substrate and a display device thereof. The thin film transistor, the manufacture method, the array substrate and the display device are used for improving drive voltage stability of the thin film transistor and prolonging service life of the thin film transistor. The manufacture method of the thin film transistor includes forming a picture containing a grid electrode, an active layer and a source drain electrode layer and forming a picture containing a grid electrode insulation layer and an etching barrier layer. The grid electrode insulation layer is located between the grid electrode and the active layer, the etching barrier layer is located between the active layer and the source drain electrode layer, the grid electrode insulation layer is located above the active layer, the gride electrode insulation layer is manufactured by at least two insulation layers, or the etching barrier layer is located above the active layer and is manufactured by at least two insulation layers.

The invention discloses a wear-resistant workpiece and a manufacturing method of a wear-resistant coating thereof. The preparation method of the wear-resistant coating comprises the following steps: forming a preparation piece according to the structure of a required wear-resistant workpiece; coating nickel on the surface of the preparation piece through a double-pulse method, thus forming a nickel-coated transition piece; and coating a hard chromium layer on the surface of the nickel-coated transition piece, thus forming the wear-resistant coating on the surface of the preparation piece. For the manufacturing method of the wear-resistant workpiece, a step of coating nickel on the surface of the workpiece through a double-pulse nickel coating method is added; and the double-pulse nickel coating method is characterized in that the magnitude of current or voltage is regulated by an external control means, the current is additionally controlled by controlling the pulse switch-on time, the pulse switch-off time, the pulse duty factor, the pulse current density and the like, and corresponding variables are changed to respectively achieve the effects of increasing the cathode current density, inhibiting the generation of side reaction, reducing the impurity content in the coating, improving the current distribution and the like, thus improving the quality of the coated nickel layer and prolonging the service life of the wear-resistant workpiece.

The invention discloses an LED (Light-Emitting Diode) flip chip. The LED flip chip comprises a sapphire substrate, an LED epitaxial wafer, as well as an n type GaN layer, a quantum well active area, a p type GaN layer and a metal reflecting layer which are arranged in sequence on the sapphire substrate, wherein an n type GaN layer exposed area is formed by etching the n type GaN layer; a transparent conducting layer and a medium reflecting layer are formed in sequence between the p type GaN layer and the metal reflecting layer; the medium reflecting layer is provided with a through hole through which the metal reflecting layer extends to be connected with the transparent conducting layer; n and p electrodes are arranged on the n type GaN naked layer and the metal reflecting layer respectively. By adding the transparent conducting layer and multiple medium reflecting layers, the contradiction between the high reflectivity and low resistivity of a single metal layer is eliminated. The LED flip chip has the advantages of high light emitting rate and low startup voltage, has higher reliability, and is more suitable for use in the field of flip LEDs.

The present invention discloses an open tube HgTe source Te-Cd-Hg epitaxial material heat treatment method. The stable mercury steam pressure required for heat treatment is provided by adopting graphite box structure. Said graphite box also can be implemented by utilizing improved liquid-phase epitaxial graphite boat, and its open tube process provides a way for batch production of the part. The success rate of using said process to make hole conduction heat treatment can be up to 100%. The hole density of the material of 77K temp. can be arbitrarily regulated in the range of 5X10 to the power 15 to 5X10 to the power 16 cm (-3). At the same time, the dislocation of material surface in the course of heat treatment does not produce increment effect, and the material composition and appearance form can be better retained.

The invention provides a nitride distributed Bragg reflecting mirror and a method for preparing the reflecting mirror, which relates to a distributed Bragg reflecting mirror, in particular to a technology for preparing nitride DBR in a gallium nitride-base microcavity light-emitting diode and a vertical cavity surface emitting laser by using chemical vapor deposition of metallorganics. The invention provides a high quality nitride distributed Bragg reflecting mirror with good surface topography and a preparation method thereof. The nitride DBR is provided with a supporting base; a GaN buffer layer is grown on the supporting base; DBR consisting of a GaN layer and an AlN layer is grown; indium is doped in the AlN or/and GaN. The method comprises the following steps: firstly, the supporting base of the C surface of a sapphire is heated and treated; a GaN nucleating layer is grown in the atmosphere of H2; a GaN buffer layer is grown after the temperature rises; subsequently, an AlN buffer layer is grown; subsequently, the temperature rises and the AlN layer is crystallized; finally, the AlN layer and the GaN layer are grown repeatedly and alternately in the atmosphere of N2 to prepare DBR; and indium is doped when one or two types of the AlN layer and the GaN layer are grown.

The invention discloses a gold-plating process using gold potassium citrate, comprising the following steps: step S1 of electrolyzing and degreasing; step S2 of pickling in the solid acid solution; step S3 of pickling in the hydrochloric acid solution; step S4 of pre-plating nickel; step S5 of plating nickel; step S6 of strengthening nickel plating at a high temperature; step S7 of pickling in the citric acid solution step S8 of pre-plating gold; step S9 of plating gold; step S10 of washing by ultrasonic wave; and step S11 of drying with hot air. The process provided by the invention has the advantages as follows: a gold-leaching plating layer with good adhesiveness and uniform distribution thickness can be formed on a surface of a plated piece matrix; and the plating layer has a better crystal structure and high hardness so as to greatly save cost; operable current density range is wide; production efficiency can be increased; radiance can be controlled easily; the process is safe and pollution-free because cyanogens matters are not used; cost is low; and economic benefit and social benefit are good.

The invention discloses a method for preparing a boron-doped diamond by using a solid doping source, and relates to a method for preparing the boron-doped diamond. The invention aims to solve the problems of unsafe gas boron source and the corrosivity to the equipment in an existing preparation method of a boron-doped diamond film. The preparation method comprises the following steps of 1, preparing the doping source; and 2, preparing the boron-doped diamond film. The method is used for preparing the boron-doped diamond by utilizing the solid doping source.

The invention relates to a Eu<3+> and rhodamine 6G doped polymer fluorescent encoding microsphere and a preparation method. The preparation method comprises the steps of dispersing a surface sulfonic polystyrene-divinyl benzene cross-linked microsphere in a mixed solvent, adding a Eu<3+> solution to obtain a Eu<3+> doped polymer fluorescent encoding microsphere, evenly dispersing the Eu<3+> doped polymer fluorescent encoding microsphere in the deionized water solution of CH3COOH and (NH4)2S2O8, adding rhodamine 6G, and carrying out shaking, centrifugal washing and freeze drying to obtain the Eu<3+> and rhodamine 6G doped polymer fluorescent encoding microsphere. After the prepared fluorescent encoding microsphere is motivated, three fluorescent emissions can be obtained; and through changing the addition of europium or rhodamine 6G, a series of fluorescent encoding microspheres with different fluorescent emission strength ratios can be prepared and can be applied to the fields of biological detection, medical diagnosis and the like.

The invention discloses a laser cladding 316L stainless steel optimizing process. The laser cladding 316L stainless steel optimizing process comprises the following steps that the cladding surface of No.45 steel base material and the contact surface of the No.45 steel base material and platforms are essentially pretreated; 316L stainless steel powder is dried for 4 hours to guarantee full drying of the powder; off-line programming for a processing track is conducted; an orthogonal test is conducted; a range analysis is conducted on the shape coefficient zeta; the range analysis is conducted on the dilution ratio D; and a metallurgical structure analysis is conducted. According to the laser cladding 316L stainless steel optimizing process, a shielding gas factor which is not valued enough before is considered emphatically and is taken as the factor which influences a stainless steel processing process for overall consideration; 316L stainless steel is obtained after cladding with the adoption of optimum process parameters obtained from the laser cladding 316L stainless steel optimizing process, it is guaranteed that a good surface appearance can be obtained on the premise that the mechanical property of the 316L stainless steel is not influenced, meanwhile the defects such as surface powder sticking, pores and cracks can be overcome, and a specific optimizing scheme is provided for process optimization of laser cladding stainless steel parts.

The invention provided with a method for machining a low-roughness high-peak textured roller. The low-roughness high-peak textured roller is machined through the steps of adjusting equipment operation accuracy, changing the roller grinding travel, reducing transverse texturing color difference, avoiding surface arcing of the textured roller, reducing the defects of bright spots and scratches on the surface of the textured roller and changing a textured roller driver structure. Compared with the prior art, the method has the beneficial effects that on the condition of not changing the performance such as the high efficiency and low operation cost of an electric spark texturing device and the excellent disordered cold roller surface topography, the lowest roughness value of the electric spark textured cold roller is reduced to 1.2 microns, and the peak value of the textured cold roller is increased to more than 130 per square centimeter, the spraying and stamping performance of a cold-rolled automobile sheet can be obviously improved, and the method has wide application prospects in production of high-end cold-rolled automobile sheets.

The invention belongs to the technical field of material synthesis, and discloses a method for preparing carbon quantum dots by using bagasse as a carbon source with a chemical oxidation process. Themethod comprises the following steps: high temperature carbonization is carried out for the bagasse at 300-700 DEG C for 2-7 hours, in order to obtain carbonized black solids, and the solids are grinded into black powder; the black powder is dispersed in acetic acid and 30wt% hydrogen peroxide, ultrasonic treatment is carried out, heating reflux is carried out at 100-140 DEG C for 6-24 hours, andcooling is carried out; the solution is filtered in order to remove impurities of large particles and solid substances which are not completely reacted; centrifugation is carried out at the rotation number of 4000-12000r/min for 10-60 minutes, dialysis of supernatant is carried out for 12-48 hours, and an aqueous solution of carbon quantum dots is obtained. The preparation process is simple, professional apparatus and equipment are not needed, tedious aftertreatment is not needed; the preparation condition is mild, strong acid and highly basic as well as other poisonous and harmful substancesare not needed; prepared carbon quantum dots have good surface morphology and high fluorescence intensity.

The invention discloses a preparation method of low-cost medium carbon steel spherical powder for 3D printing. The preparation method comprises the following steps: proportioning medium carbon steel from the following components: 0.43% of C, 0.58% of Mn, 0.18% of Si, 0.25% of Cr, 0.24% of Ni and the balance of Fe, adopting vacuum induction melting to prepare a carbon steel bar, removing the oxidescale on the surface of the alloy bar through machining to process an electrode bar size meeting the requirement of a plasma rotating electrode atomization powder manufacturing apparatus, placing theelectrode bar in a flour mill, adopting a plasma gun to melt the end part of the electrode bar to obtain spherical powder under the action of the centrifugal force, and later, adopting supersonic vibration to screen the collected powder according to different particle sizes. According to the preparation method, plasma rotating electrode atomization is adopted to prepare medium carbon steel spherical metal powder, and the prepared powder has the characteristics of being high in degree of sphericity, less in satellite powder, high in powder density and low in impurity content, can meet the demand of metal powder for 3D printing and is suitable for wide popularization.

The invention discloses a texturing and cleaning method of a heterojunction battery. The method comprises the following steps: pre-cleaning an original silicon wafer by adopting SC1; carrying out rough polishing and damage removal treatment on the silicon wafer; cleaning with an ozone system solution; texturing the silicon wafer; adopting an SC1 or ozone system solution for cleaning; corroding thesilicon wafer, and carrying out smooth rounding treatment; adopting an SC2 or ozone system solution for cleaning; drying the solution ; and adding an HF acid pickling process before the SC1 or ozonesystem solution cleaning process, the smoothing and rounding process, the SC2 or ozone system solution cleaning process and the drying process. The surface of the silicon wafer is ensured to be completely clean, a better surface appearance is obtained, and the performance of an HJT battery is improved to a great extent.

The invention discloses a preparation method for a Cu-Al co-doped p-type ZnO film and belongs to the technical field of semiconductor materials and luminescent materials. The method comprises: dropwise adding a prepared Cu-Al co-doped ZnO colloidal solution on a substrate, coating a film in a spin coating manner, drying, and performing annealing processing, so as to obtain the needed film. The Cu-Al co-doped p-type ZnO film exhibits good optical characteristics. The method has the advantages of low synthetic temperature, good film-forming uniformity, large film-forming area, strong adhesive force with the substrate, atom-grade doping easiness, accurately controllable doping level, simple technology and the like.

The invention provides a dental implant surface treatment method. Due to sand blasting and acid etching treatment before soaking, dental implant surface roughness is increased to some extent; further,due to calcining in a later stage, dental implant surface roughness is increased remarkably, the implant bone combination capacity can be increased, and accordingly the dental implant clinical success rate is increased. A mixed acid formed by hydrofluoric acid and nitric acid is adopted for acid etching to provide a great sand blast dental implant surface morphology, great rough surface characteristics of dental implants are achieved, and interface bonding strength of a dental implant and bone combination surface is further improved. The method is simple in operation, convenient and simple intreatment, low in cost and applicable to industrial large-scale production.

Described are compositions (e.g., slurries) useful in methods for chemical-mechanical processing (e.g. polishing or planarizing) a surface of a substrate that contains tungsten, the slurries containing abrasive particles, metal cation catalyst, phosphorus-containing zwitterionic compound, and optional ingredients such as oxidizer; also described are methods and substrates used or processed on combination with the compositions.

The invention discloses a semiconductor device forming method. The method comprises steps that: a base comprising a first area and a second area is provided, wherein the first area base and the secondarea base are provided with first oxidation layers; an etching process is carried out to etch and remove the first oxidation layer with a first thickness in the first area; after the etching processis carried out, the remaining first oxidation layer in the first area is subjected to a cleaning process; the etching process and the cleaning process are carried out alternatively until the first oxidation layer in the first area is removed; and a second oxidation layer is formed on the first area base, wherein the thickness of the second oxidation layer is different from that of the first oxidation layer. The first area base can be prevented from being etched and damaged, the first area base can thus keep a good surface morphology, and the electrical performance of the formed semiconductor device is improved.